150 HPDI leaking oil

[badhabits49]

2001 150 HPDI leaking oil out small holes at lower unit, green yamaha lube. pulled lower unit to change water pump and have large amount on lower engine seal on power head. It the lower engine seal bad?

 

[rodbolt]

Re: 150 HPDI leaking oil

does this engine spend much time tilted up?
and is it gear lube or two stroke oil?

 

[badhabits49]

Re: 150 HPDI leaking oil

Very seldom tilted up, on lift in marina unless on trailer during winter months.Noticed it when i took it out to replace water pump impeller. Oil is two stroke Yamaha lube.

 

[rodbolt]

Re: 150 HPDI leaking oil

most likly the engine oil switch is leaking or the oring for oil pump to block is leaking.

 

[badhabits49]

Re: 150 HPDI leaking oil

thanks Rodbolt will check the oil pump and switch. Yamaha Lube too expensive to run in the lake.

 

[rodbolt]

Re: 150 HPDI leaking oil

its also possible that the pump shaft seal is leaking, but look for external leaks first.

 

[badhabits49]

Re: 150 HPDI leaking oil

No external leaks found and engine smokes excessive for HPDI when started each morning after sitting on lift with engine level. Had lift fuel pump with small hole in diaphram which made hard to start sometimes, repalced both fuel pumps a couple of weeks ago, now starts and runs great, but still has excessive smoke when starting sometimes after sitting. Local Yamaha tech thinks maybe all extra fuel has made lower crank seal bad, but not ready for that cost yet. Will pull oil pump back to check shaft seal, waiting on new o ring to come in first. Left lower unit off and cleaned all oil from lower end of crank area and next morning had small amount of green lube that dripped into pan, maybe 10 drops.