I keep on having trouble with my FP 60 overheating, enen though there is a stream of smoke comming out of the exhaust. I have tried all adjustmemts with the high sppeed needle. Thanks, Andy
OS Max FP 60
Aug 21, 2004
8 Replies
On 8/21/2004 10:21 AM Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge:
Do you have enough air getting to the cylinder and head ? Are the cooling fins on the cylinder and head clogged ?
ANother variable to consider is the size and pitch of your prop. How do you know it is overheating, BTW? Andy
We can make a box of wood.....FLY!!
How do you know it's too hot? Is the smoke light or black.brown?
- Diameter & pitch of the prop - too large/too much pitch?
- Adequate cooling - Engine fins clean. If it's cowled, enough airflow in AND out?
- Age - is it simply worn out?
- Can it be run in a blubbering rich cycle? If not, then the vent line on the tank may be clogged. Fuel line may be too small or clogged.
- Filters in line? Are they clean?
Dr.1 Driver "There's a Hun in the sun!"
Shutting down in flight,loss of power, very hot to touch>
12x6
e cooling - Engine fins clean. If it's cowled, enough airflow in
Fins are clean.
maybe wore out...
Yes , it will spit fuel all over, fuel lines ok, No filters...
overheating is the result of the engine running lean either from the improper needle setting or from the engine leaking air from somewhere. so, if you are sure it is not in the needle, check the following:
that the glow plug isn't cracked or loose- which will cause the engine to go lean. burned fuel around the glow plug threads are a tell tale sign of a loose plug or a cracked plug.
the fuel system is good - breathe through the fuel line and plug up the vent line, if it leaks, find out where. personally, with problems like these, i would just replace all the fuel lines.
things i would do, and in order:
check plug replace fuel lines tighten all engine screws remove and blow out carb
find where the engine or fuel system is leaking air, and you will solve the problem. these are usually simple fixes that just require some diagnostic skills.
Another reason for overheating is that the cylinder liner is damaged, i.e., the plating is flaking off, not an uncommon thing for an OS
60FP. Remove the muffler and look into the exhaust port under a bright light , see if you can spot patches where the shiny nickel plating is missing. If it is, s___can the engine, as a new cylinder liner will cost you more than the engine is worth. Better to replace it with a quality engine like a Webra or Enya which are a little pricey compared to the OS FP but well worth it, or an ST which will cost little more than a liner for the OS FP, or even another OS, if it's an FX model (back into pricey)..Abel
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I'd check for air leaks as the others have suggested. If resealing everything doesn't work, I'd try a 12x5 prop to put slightly less load on the engine than your current 12x6. APC, Master Airscrew, and Zinger make this size. Might not help, but it's fairly cheap to find out. The Right Flyer is a great plane for a low pitch prop.
Carrell
The OS FP series of engines were notorious for leaking air around the needle valve. I never saw one where this wasn't a problem. Those of us who use (or used) these engines would solve the problem by sealing the threads where the needle valve screws on. A piece of fuel tubing cut to about 3/16" in. length placed between the needle and its seat did the tick nicely.
Jim - AMA 501383
PaulBK58 wrote:
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