Metal in your oil filter is not a diagnosis -- it's the start of an investigation, and for piston engines, the camshaft and lifters are usually the first place to look.John holds up actual worn parts and walks through what a healthy lifter looks like versus one with pitting, corrosion, and a worn-through hardened face. Once the hardened steel surface on a flat-tappet lifter breaks down, soft metal is riding against the camshaft lobe and both components are eating each other. He explains the design difference between Lycoming and Continental lifters -- T-shaped flat tappets on top for Lycoming, barrel-style lifters at the bottom for Continental -- and why Continental gives you the advantage of pulling lifters without splitting the case. He also addresses the roller lifter question directly: they're not a cure, they cost four to five times as much, and in high-cycle engines they can fail just as badly as flat tappets, just in a different way.The episode covers what owners should actually ask their mechanics when camshaft wear is suspected. A single borescope pass isn't enough -- there are multiple lobes, and a partial inspection misses the ones that matter. Oil analysis can flag the presence of metal but can't tell you where it's coming from until you start disassembling. Jeff and John walk through the diagnostic sequence: oil analysis, rocker cover inspection, pushrod movement, and what it takes to actually confirm the diagnosis. They also explain when replacing lifters without touching the camshaft is a reasonable interim option -- and when it's just delaying an overhaul that's already necessary.In this episode, we cover:- How camshaft lobes and lifters work together in Continental and Lycoming engines- Why a borescope inspection of the camshaft can give you a false sense of security- The progression from pitting and corrosion to total lobe failure -- and how fast it happens- Flat-tappet vs. roller lifters: cost, failure modes, and whether roller is actually an upgrade- The Continental advantage: replacing lifters without an engine teardown -- and its limits- Diamond slurry lifters and whether they offer any real protection compared to standard flat tappets- How to read oil analysis results when you suspect camshaft or lifter wear- When replacing lifters is a legitimate interim fix vs. a Band-Aid that delays the real repairGet in touch!Web - SignatureEngines.comEmail - [email protected] - https://www.youtube.com/channel/UCfaCQMkJRkLQ-MUg2kwHy2A

On a 90-degree day, your engine is already warm before you start it -- and how you handle takeoff, climb, and shutdown can mean the difference between a healthy engine and a damaged one.Jeff walks through the specific things that change in hot weather operations: why you open the cowl flaps before takeoff, why climbing at a slightly higher airspeed matters, and why reducing power marginally during climb keeps cylinder head temps in check when airflow is lowest. He covers what happens when you push a turbocharged engine hard and then shut it down immediately -- the oil cooks against the hot turbine, and the next thing you know, the turbo is gone. John adds the ground perspective: letting the engine stabilize at idle before shutdown, monitoring oil temp for that first drop as an indicator that the oil is actually cooling the internals rather than cooking in them. The line guy's impatience is your problem, not theirs.The conversation also covers cold-weather mistakes that put just as much wear on the engine. Owners who run up at high RPM trying to force the engine to temperature faster are generating friction heat before there's enough oil moving through the system to handle it. John explains why idle and patience is the correct technique -- and why you should record which accessories are on during runup because unnecessary electrical load during a hot-day cool-down only adds heat you don't need.In this episode, we cover:- Why hot weather changes your climb profile -- and what speed adjustment helps the engine most- Cowl flaps: when to open them, when to close them, and what they're actually doing- How to cool a turbocharged engine properly before shutdown -- and what happens if you don't- Reading oil temperature as your indicator that the engine has actually cooled before you shut down- What to say to ATC if you need to level off mid-climb for engine cooling- Why running at high RPM in cold weather is one of the most common ways owners damage their engines- How friction heat during cold-weather runup differs from combustion heat -- and why oil needs time to circulate first- When to turn off accessories during cool-down and why electrical load affects engine temperatureGet in touch!Web - SignatureEngines.comEmail - [email protected] - https://www.youtube.com/channel/UCfaCQMkJRkLQ-MUg2kwHy2A

Mixing up hobsmeter time and tach time is one of the most common sources of confusion in aircraft maintenance records -- and when it goes unresolved, it costs owners money and obscures the real condition of the engine.John breaks down the difference between the two gauges, why they're not interchangeable, and what happens when a mechanic or owner has been flip-flopping between them for years without documenting which one was used. The tachometer measures engine use; the hobs measures how long the master switch has been on. For maintenance purposes, tach time is what drives decisions about overhaul intervals and AD compliance. Jeff explains what to do when a gauge is replaced, fails, or doesn't match prior entries -- and why "estimated" and "unknown" are legitimate and important entries when the true time can't be substantiated. Leaving a time gap unexplained is far worse than flagging it accurately.The conversation gets into time since major overhaul (SMOH) and total time since new (TSN) -- what both mean, how to read them on an overhauled engine versus a first-run engine, and what a remanufactured engine serial number actually tells you. John explains why knowing SMOH is the most critical number when deciding whether to repair or fully overhaul an engine, and what the Continental and Lycoming recommended intervals actually represent.In this episode, we cover:- The functional difference between a tachometer and a hobsmeter -- and which one to use for engine maintenance- Why flipping between tach and hobs time in logbook entries creates confusion and red flags- What to document when a gauge is replaced or fails mid-ownership- When to write "estimated" or "unknown" in a logbook entry -- and why that is the right call- Time since major overhaul (SMOH) vs. total time since new (TSN) -- how to read both- What a remanufactured engine serial number means for Continental and Lycoming engines- Why high total time since new is not the same as a worn-out engine- How SMOH drives repair vs. overhaul decisions at Signature Engines00:00:41 Introduction -- why tach vs. hobs matters00:02:41 How entries should note time and which gauge to use00:05:27 What to do when you only have one gauge00:06:50 Documenting gauge replacements and time gaps in the logbook00:09:21 When "estimated" and "unknown" belong in a logbook entry00:10:30 Time since major overhaul vs. total time since new00:13:27 Remanufactured vs. overhauled -- what zero-time actually means00:16:12 How many times can an engine be overhauled?Get in touch!Web - SignatureEngines.comEmail - [email protected] - https://www.youtube.com/channel/UCfaCQMkJRkLQ-MUg2kwHy2A

Incomplete or vague logbook entries don't just cost you money at resale -- they can expose you to liability for work done on an aircraft you haven't owned in a decade.

John and Jeff walk through how aviation logbooks actually work: the three types (pilot, airframe, engine), what entries should say and why, and the red flags that tell an experienced mechanic something went sideways. They explain the difference between "engine removed for inspection" and an entry that actually tells you what happened -- and why that difference matters when you're the next buyer, the inspector signing it off, or the previous owner when someone gets hurt. Jeff describes a recurring pattern he sees on pre-buy inspections: engines with entries that say just enough to look compliant but leave the real story out. John explains why owners sometimes push mechanics to document less -- and why that strategy backfires.The episode gets specific about what pilots and owners are actually responsible for. Airworthiness directives, their recurring intervals, and how to read an AD list vs. a blanket "all ADs complied with" sign-off. What belongs in the aircraft during flight versus what should stay in a safe. The difference between a prop strike that was handled correctly and one that was quietly buried. And the concept of vicarious liability -- why your documentation obligation doesn't end when you sell the plane.In this episode, we cover:- The three types of aviation logbooks and what each one should contain- Why "engine removed and reinstalled" is one of the biggest red flags in any logbook- How to spot a prop strike or sudden stoppage that wasn't properly addressed in the records- What AD compliance entries should actually say vs. the generic sign-offs that hide problems- Why owners sometimes push for minimal documentation -- and the liability exposure that creates- The difference between records you must carry in flight and original documents that belong in a safe- How vicarious liability works in aviation and why it can follow a previous owner for 10-20 years- What a well-organized logbook looks like to a mechanic walking in cold for a pre-buy00:00:31 Introduction -- logbook confusion and the three types00:03:37 What mechanics look for on pre-buy inspections00:05:30 Why minimal documentation is a liability trap00:08:06 How ADs reference historical maintenance and why complete records matter00:09:09 What to keep in the aircraft vs. what to store safely00:13:16 Vicarious liability -- your obligation doesn't end at sale00:16:43 The inspector as last line of defense -- when work can't be signed offGet in touch!Web - SignatureEngines.comEmail - [email protected] - https://www.youtube.com/channel/UCfaCQMkJRkLQ-MUg2kwHy2A

Send us questions by commenting below or emailing John & Jeff at: [email protected]

Is Your Checklist Actually Protecting Your Engine?

Following your aircraft checklist isn't optional — and skipping a single step like mixture full rich on takeoff can send cylinder head temperatures past 400° before you've leveled off. John and Jeff walk through the checklist habits that actually protect your piston engine.

In this episode, John Buckles and Jeff Schanbel talk through the operating checklist the way two mechanics see it from the shop floor — not as paperwork, but as the difference between a healthy engine and a damaged one. They cover why leaning the mixture during taxi keeps spark plugs from carbon fouling, why pushing the mixture full rich before takeoff is the step pilots forget most often, and what high CHT on climb is really telling you. They also get into engine startup discipline, why running up to high RPM right after start beats up the engine, and why turbocharged airplanes need cooldown time at idle before shutdown — not a quick mag check and mixture cut. The bigger theme: most of the engine problems they see trace back to pilots being in a hurry. Move controls slowly, monitor the engine the same way you monitor your flight instruments, and if temperatures or pressures start climbing on takeoff, level off and troubleshoot before pressing on to altitude. You don't have to declare an emergency to tell ATC you need to stay low and sort something out.

In this episode, we cover:

- Why mixture full rich is the checklist item pilots most often miss before takeoff

- How a missed mixture step can push CHT over 400° in a fast climb

- Why leaning during taxi reduces spark plug fouling and carbon buildup

- What to do when CHT or oil pressure starts climbing during initial climb

- How to talk to ATC about leveling off without declaring an emergency

- Why high-RPM operation right after startup damages the engine

- Why turbocharged engines need idle time before shutdown

- The checklist habits that prevent gear-up landings and engine damage alike

This one is for owners and pilots who want their engine to make TBO — and who know that the checklist hanging in the cockpit is the cheapest maintenance tool they own.

TIMECODES

00:00 The checklist step pilots skip most often

00:32 What to review before you start the engine

01:16 Why mixture full rich before takeoff matters

01:52 How fast CHT climbs past 400° when you forget

02:14 Don't assume you know the checklist — read it every time

02:40 Why rushing the shutdown damages your engine

03:35 Gear-up landings, GUMPS, and why checklists exist

03:53 Move engine controls slowly, every time

04:14 Turbocharger cooldown before shutdown

04:49 If temps rise on climb, level off and assess

05:20 Monitor the engine like you monitor your instruments

06:03 Telling ATC you need to level off without declaring an emergency

Get in touch!

Web - SignatureEngines.com

Email - [email protected]

YouTube - youtube.com/@SignatureEnginesInc

Send us questions by commenting below or emailing John & Jeff at: [email protected]

How to Keep a Post-Flight Discrepancy Log

Most engine problems don't show up overnight — they trend. Keeping a simple post-flight discrepancy log is how you catch them before they ground you, or worse.

John and Jeff walk through the habit they wish every owner and pilot would adopt: at the end of every flight, write down what you noticed. A new noise, a vibration, a temperature that ran a little higher than normal — or nothing at all. Even "none noted" with the date and your initials is worth writing, because it gives the next pilot and your mechanic a baseline to compare against. The guys explain why this matters most on aircraft with multiple pilots, where nobody wants to be the one to "make it a thing," and how that silence lets small issues turn into expensive ones. Jeff shares a real example: a young pilot who heard a popping sound out of the left engine for about two months and brushed it off — until they pulled the cowling and found an exhaust stack hanging an inch and a half loose. Hot exhaust gases that close to a wiring harness can melt insulation and kill power to the engine, and a stack that fully breaks loose becomes a hazard on the ground. The fix, caught early, would have taken minutes. By the time it was found, it was a near miss. The episode is about building the awareness and the paper trail that catches problems while they're still cheap.

In this episode, we cover:

- Why a written post-flight squawk log beats relying on memory

- What to write when nothing went wrong (and why "none noted" matters)

- How trending small symptoms reveals real engine problems

- The communication gap on multi-pilot aircraft, and how to close it

- A real-world case: a popping sound that was a hanging exhaust stack

- What can go wrong when an exhaust stack hangs near a wiring harness

- Why looping in your mechanic — or another mechanic — pays off

- How to give your A&P the history they need to actually diagnose an issue

If you fly behind a piston engine, this is one of the cheapest habits you can build to keep your airplane airworthy and yourself safe.

TIMECODES

00:00 The post-flight habit nobody wants to do

00:27 Why "I think I felt this 3 months ago" is too late

01:18 What to write down — even when nothing happened

02:08 The multi-pilot communication problem

03:23 The popping sound that was a hanging exhaust stack

05:16 What a loose exhaust stack can actually do to your engine

06:00 Call your mechanic — or another mechanic

Get in touch!

Web - SignatureEngines.com

Email - [email protected]

YouTube - youtube.com/@SignatureEnginesInc

Send us questions by commenting below or emailing John & Jeff at: [email protected]

How to Preflight a Piston Engine the Right Way

A real preflight inspection is more than opening the oil door and checking the dipstick. John and Jeff walk through what they actually look for before every flight — and what most pilots miss.

Vibration is the number one enemy of a piston aircraft. Motor mounts crack, components loosen, and parts break between flights. A magneto that ran fine yesterday can be dead today. You won't catch all of it on a walkaround, but you'll catch a lot more than you think if you slow down and know where to look. John and Jeff start under the aircraft — looking for fresh oil, fuel, or hydraulic leaks on the ramp or hangar floor — then work up through the cowl, the propeller, the intakes, and the belly. They talk through the bird nests and mud dauber nests that show up after the plane sits, why a piece of cardboard under the airplane is one of the cheapest diagnostic tools an owner can have, and why a constant-speed propeller deserves more than a glance. Then they move into the cockpit, where checking the throttle, mixture, and prop control for freedom of movement before start can flag a problem before you ever turn the key.

In this episode, we cover:

- Why looking under the aircraft is the first step, not the oil door

- How to tell normal seepage from a developing leak using a piece of cardboard on the hangar floor

- What mud daubers and birds get into — breather tubes, carb intakes, pitot — and how to spot the trail

- Why you should open the cowl when you can, and what to look for when it's open

- How to check a constant-speed propeller for leaks and security on preflight

- Why the windscreen, nav lights, and landing lights matter even on a day VFR flight

- What a sticky throttle, mixture, or prop control can tell you before engine start

- Why a magneto can fail between flights and how the runup catches what the walkaround can't

A thorough preflight inspection is the cheapest insurance an owner has — and the difference between catching a problem on the ramp or finding it in the air.

TIMECODES

00:00 The preflight habits that separate good pilots from bad ones

00:36 Why most pilots only check the oil and stop there

01:02 Start under the aircraft: looking for oil, fuel, and gear leaks

01:21 Open the cowl when you can — what breaks between flights

02:12 Vibration, motor mounts, and why piston aircraft parts fail

02:31 Inspecting the propeller and checking the intakes for nests

03:00 Mud daubers, birds, and what shows up after the plane sits

04:11 Using cardboard under the aircraft to track leaks over time

04:54 Don't skip the windscreen, nav lights, and landing lights

05:28 In-cockpit preflight: throttle, mixture, and prop control freedom

Get in touch!

Web - SignatureEngines.com

Email - [email protected]

YouTube - youtube.com/@SignatureEnginesInc

Send us questions by commenting below or emailing John & Jeff at: [email protected]

Why Oil Analysis Alone Won't Save Your Engine

Oil analysis is an indicator, not a verdict on airworthiness. John and Jeff break down why the report is just one tool, and what you have to do alongside it to actually know what's happening inside your engine.

More owners and pilots are leaning on oil analysis like it's the final word on engine health. It isn't. Both Lycoming and Continental tell you to inspect the oil filter — cut it open, flush the media, run a magnet through it, and look at what your engine is actually shedding. John and Jeff walk through the full routine: how to take an oil sample correctly (always midstream, never the first or last of the drain), why letting the drained oil settle in a clean five-gallon bucket and filtering the last bit through a coffee filter tells you what's really sitting in the sump, and why pictures of every filter and screen inspection beat trying to remember what last quarter looked like. They cover the difference between ferrous and non-ferrous debris, why a high iron reading after a winter of sitting often just means corroded cylinder walls getting scraped clean, and the Lycoming brass bushing AD covering engines built between 2009 and 2015. They also get into the part most owners skip entirely — the finger screen — and why it catches the big chunks an oil filter never will. If your filter has a bypass valve and you're making metal between long oil changes, that material can route straight to your bearings without you knowing the bypass ever opened.

In this episode, we cover:

- Why oil analysis is an indicator, not an airworthiness determination

- How to take an oil sample correctly — midstream of the drain, every time

- Cutting open the oil filter, flushing the media, and running a magnet through the debris

- Letting drained oil settle and filtering the last 5% through a coffee filter to see what's really in the sump

- Why you need to photograph every filter and oil inspection, not rely on memory

- Telling ferrous from non-ferrous debris and what each suggests

- Why finger screens catch failures the oil filter will miss

- The Lycoming brass bushing AD on engines built 2009–2015 and why you watch the oil for brass

- How shorter oil change intervals reduce the risk of the filter bypass dumping debris into your bearings

For piston aircraft owners who want to catch problems early instead of being surprised by them — this is how you actually read what your engine is telling you.

TIMECODES

00:00 The oil sampling mistake that wrecks your data

00:38 Why oil analysis is an indicator, not airworthiness

01:35 How to inspect your oil filter the right way

02:28 Reading what's left in your drained oil

03:20 When elevated readings don't mean engine trouble

04:07 The catastrophic failure oil analysis missed

05:17 Taking samples midstream and staying consistent

05:55 High iron after winter — what it usually means

06:48 What chrome, nickel, aluminum, and molybdenum tell you

07:39 Lycoming and Continental limits on filter debris

08:12 Saving filter elements in baggies for comparison

08:51 Why finger screens still matter and why mechanics skip them

09:39 Filter, screen, or both — what to inspect and why

10:31 The Lycoming brass bushing AD (2009–2015 engines)

11:14 What the finger screen catches that the filter won't

11:37 Why the filter bypass valve is the hidden risk

Get in touch!

Web - SignatureEngines.com

Email - [email protected]

YouTube - youtube.com/@SignatureEnginesInc

Send us questions by commenting below or emailing John & Jeff at: [email protected]

How Often Should You Change Aircraft Engine Oil?

The 50-hour aircraft engine oil change interval in your POH was written for flight schools flying constantly — not for the owner who flies a few hours a month and parks the plane. John and Jeff break down what the book actually says and what most owners miss.

Aircraft engine oil isn't automotive oil. It's only about 6 to 7% additives compared to 13 to 16% in conventional auto oil, and those additives — the ones fighting moisture, acids, sludge, and carbon — start breaking down around 20 to 25 hours. After that, the oil still lubricates, but it's no longer protecting the inside of your engine from the corrosion cycle that runs every time the crankcase heats up and cools down. That's how camshaft and lifter pitting starts on Lycomings, and it's why John and Jeff see rust inside engines from owners who swear they fly regularly.

The piece almost everyone overlooks is the calendar rule: change the oil every four months regardless of hours. Two hours on the engine in four months still means it's time. The hosts walk through why "regular use" isn't ten hours in one trip followed by three weeks parked, why active preservation only happens in the air at temperature, and why the difference between a 30-hour and 50-hour oil change is one extra change per 100 hours — cheap insurance against an engine teardown.

In this episode, we cover:

- Why the 50-hour interval was written for flight schools, not typical owners

- The 4-month calendar rule in the POH and what it actually requires

- How aircraft oil additives break down by 20 to 25 hours

- Why aircraft oil is only 6 to 7% additives versus 13 to 16% in automotive oil

- How condensation, acids, and the crankcase greenhouse effect cause internal rust

- Why camshaft and lifter pitting hits both Lycoming and Continental engines

- Why ground runs and taxiing don't count as active preservation

- The 30 to 35 hour oil change recommendation and pulling the filter every 100

If you fly less than 200 hours a year, this episode helps you stop a corrosion problem before it turns into a top overhaul.

TIMECODES

00:00 What the POH 4-month oil change rule actually says

00:30 Is the 50-hour oil change interval right for your flying?

01:33 Why aircraft oil only has 6 to 7% additives

02:42 How rust starts inside engines that "fly regularly"

04:18 Why 30-35 hour oil changes are cheap insurance

05:16 What "regular use" really means for piston engines

06:22 Humidity, condensation, and the crankcase greenhouse

07:16 Camshaft and lifter pitting on Lycoming vs Continental

08:11 Final recommendation: 30-35 hours, every third change pull the filter

Get in touch!

Web - SignatureEngines.com

Email - [email protected]

YouTube - youtube.com/@SignatureEnginesInc

Send us questions by commenting below or emailing John & Jeff at: [email protected]

How to Properly Drain Oil From Your Aircraft Engine Sump

If you own a prop plane and you've never pulled the quick drain out of your oil sump, you might be hiding water, metal, and sludge at the bottom of your engine — and getting clean oil analysis reports that aren't telling you the truth.

In this first episode, John and Jeff break down the quick drain valve — the threaded plug at the bottom of the oil sump that lets you connect a hose and drain oil without making a mess. It's one of the most common parts on small piston aircraft, and one of the most misunderstood. They explain why the convenience comes with a catch: the plug threads stick up an eighth to a half inch into the sump, creating a dam that traps water, heavy metals, and combustion byproducts below the drain level. That trapped material sits there change after change until it finally rises high enough to come out, which is often when an owner suddenly sees red and yellow flags on an oil analysis report that looked fine for years.

They walk through the right maintenance rhythm for general aviation piston engines: use the quick drain for routine oil changes every 30-35 hours, but every third change — roughly every 100 hours — pull the entire valve out of the sump with the warm oil still in there and let the volumetric pressure flush the bottom clean. They also cover when to replace the plug entirely (every 4-5 years, around $100-$130), why the FAA no longer permits overhauling them, the safety-wire hole most people miss, and one real-world story of a socket found blocking a customer's drain.

In this episode, we cover:

- Why the quick drain plug threads create a sludge trap at the bottom of your sump

- The 100-hour rule for fully removing the quick drain, not just draining through it

- How a partially blocked quick drain skews your oil analysis results

- What to do with the warm oil still in the engine when you pull the plug

- Why the FAA stopped allowing overhauls of quick drain valves

- The 4-5 year replacement interval and what a quality replacement costs

- Why the safety wire hole on the plug matters and what happens if you skip it

- Signs your quick drain seal is failing — slow drips, slow drains, rounded threads

This one's for prop plane owners and pilot-mechanics who want their oil analysis to actually mean something, and who'd rather spend $100 on a new plug than find out the hard way what a failed one does in flight.

TIMECODES

00:00 Why You Should Pull Your Quick Drain Every 100 Hours

00:26 Welcome to Keep Those Props Turning

00:35 What a Quick Drain Is on a Prop Plane Engine

01:44 The Socket in the Sump and Other Quick Drain Failures

02:13 How Quick Drain Threads Trap Water and Metal in Your Oil

03:00 Why Your Piston Aircraft Oil Analysis Suddenly Shows Red Flags

03:52 The Right Way to Drain Oil Every 100 Hours

04:06 Drain Hole Diameter and How It Affects Oil Flow

04:48 When to Replace Your Quick Drain Valve and What It Costs

05:36 Why the FAA No Longer Allows Quick Drain Overhauls

06:05 Safety Wiring Your Quick Drain Plug

06:39 What Happens If a Quick Drain Fails in Flight

Get in touch!

Web - SignatureEngines.com

Email - [email protected]

YouTube - youtube.com/@SignatureEnginesInc