Slight Oil Leak F115

[Redfisher18]

I have a 2002 F115 with 1450 hours on it.

The last time I used the motor I could smell a hint of burning oil. I checked under the cowl and found some traces of oil on the bolt heads on the starboard side of the power head. I have checked under the flywheel and it is completely dry.

There is barely a hint of oil in the lower pan and engine oil level if fine.

Not sure where else it could be coming from . Is there any chance it could be leaking from the seal on the dip stick ? When checking the oil level it does not feel that tight where it seats.

Thanks in advance

JON

[TownsendsFJR1300]

It's possible to have some blow by seep out the filler tube...

That seal should be pretty cheap (simply replace it and eliminate the potential problem).

If it continues;

I'd clean (de-grease) any oil residue and monitor. A spritz of baby powder will stick to any fresh oil residue.. Might show up quickly, might be awhile.


*I bought a car with a Dodge slant six decades ago that blew oil out the filler hole, (approx 5 quarts in 20 miles-BAD). Cleaned as noted above and found that leak(dip stick hole)-engine ran great.

Yanked the engine, turned out pistons rings were EXTREMELY WORN (1/4" ring end gap). Compression was blowing past the rings, into the crankcase, then out the filler hole. Re-ringed, BIL drove it for YEARS afterwards, no leaks, oil burning, etc...

Should your rings be worn badly, it'd do the same.. A leak down test, would pin point that down real quick...

[rodbolt17]

no do a compression test first. what a waste of time. I cannot belive someone mentioned a leakdown test.
but there is babypowder and NAPA sells a compound that floureces under a black light for leak detection.

[TownsendsFJR1300]

no do a compression test first. what a waste of time. I cannot belive someone mentioned a leakdown test.
but there is babypowder and NAPA sells a compound that floureces under a black light for leak detection.

Why a compression test??

Why NOT a leak down test if that seal is NOT the issue??


With a leak down test, you'd hear air in the crankcase and see the actual health of the internals of the engine.

I do them all the time(leak down)..

Saves a BUNCH of time, even on the two strokes...

An early 1980's, two stroke Mcculloch chain saw leak down test:



Compression test, same engine:



You could hear air come out the carb BIG TIME with the leak down test (motor was toast)

[99yam40]

I am sure Rod was just jacking around.
He is the one that always tell us the compression test are a waist of time.

You happened to say leak down test before compression test so he had to jack with it

[pstephens46]

I am sure Rod was just jacking around.
He is the one that always tell us the compression test are a waist of time.

You happened to say leak down test before compression test so he had to jack with it

Apparently Rod is in a jacking around mood today....

[TownsendsFJR1300]

It's Friday!