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- What procedure should you follow if valve blow-by is indicated by a hissing sound on a reciprocating engine when pulling the prop through?
- Perform cylinder compression test to identify the faulty cylinder
- What is the running valve clearance on engines equipped with hydraulic valve lifters?
- Zero
- When troubleshooting a running engine malfunction, what does a cold cylinder indicate?
- Lack of or No combustion in the cylinder.
- What factors about the condition of an engine can be learned by studying the results of a compression test?
- Determines if your valves, pistons, and piston rings are adequately sealing.
- What should be done to repair a loose stud in an engine crankcase?
- Remove loose stud, inspect hole for size and condition of thread, if necessary, use oversized stud.
- How is a cylinder barrel inspected for out of roundness?
- Cylinder bore gauge used at the top of the cylinder and also the skirt. take 2 reading 90degrees to each other.
- What types of connecting rods are typically found in radial engines?
- Master and articulating rods.
- What are the different types of piston rings?
- Compression, Oil Control, Oil Scraper
- What is the purpose of oil control rings?
- They regulate thickness of the oil film on the cylinder wall.
- What types of bearings are in general use in reciprocating engines?
- Ball, Plain, Roller
- How are piston ring gaps installed relative to each other on a piston, why?
- Staggered position so that no rings are aligned with each other preventing excessive blowby.
- What is the purpose of valve overlap?
- Better volumetric efficiency and lowers cylinder operating temperature.
- What is the purpose of crankshaft dynamic dampers?
- They reduce engine vibrations
- What does " Within serviceable limits" mean when referring to an engine part?
- Part will likely not wear to the point of causing engine failure within the next time between overhaul (TBO).
- Name at least one part of an inspection that should be made after a propeller strike (no sudden stoppage).
- Inspect engine mounts, crankcase, and nose section for damage. inspect oil and screens & filters for metal particles, inspect prop drive shaft and crankshaft for misalignment.
- What is an indication that a primer is leaking or is open during engine operation?
- Engine won't idle properly.
- What may be the resul
2 Stroke Marine engines reach beyond 50% efficiency, turbines about 44%.
Is it because reciprocating engines of that efficiency are actually not single cycle since they have turbo compressor?.
I ask because i don't get why even protecting the walls of the turbine from the combustion gasses the efficiency is still so 'small'. Even for a power output an order of magnitude greater than for reciprocating engines.
We had a discussion in the shop last week about how long someone could keep a reciprocating engine - small engine, car engine, etc. - running. Our supervisor who is a mechanical engineer said there is no limit, because you could keep replacing the parts on the block, etc. and even if the parts weren't made, you can always get things like pistons and rings made. I said the thermal cycles should eventually cause permanent failure of the block casting, but he said it shouldn't warp if not overheated and there are plenty of industrial engines with 5 or 6 overhauls and tens of thousands of hours on them and that would apply to virtually any reciprocating engine.
What am I missing here? I can't see how someone could keep rebuilding, say, a small engine five or six times, or even a car engine.
Sorry if this is the wrong place. But I'm having a hard time googling this because there's so many things related that I'm not looking for.
What I mean is, exhaust gasses used only to power a turbine to mechanically assist the rotation of the engine? Another thing I wonder is if anyone's done away with a compressor in place of a generator and use your waste gasses for electricity instead of charging the air.
Is it like, some timing mechanism? Or the vacuum created pulls in fuel/air? These could very well be wrong
