Dhopper71
Seaman
- Joined
- Jun 12, 2011
- Messages
- 70
I'm finally getting my '74 Mercruiser 140 3.0L running well. Spent a lot of time tinkering and tuning, but still have this issue present. I have changed the oil now a few times, but when I pull the dipstick, it still looks a little diluted and smells like gas. The fuel pump is the old Carter mechanical unit with no third line up to the carb. If the diaphram goes on this unit, does it just dump into the crackcase? How dangerous is it if there's gas in the oil? Is there another way it could be getting in the oil? Bad rings? Wouldn't compression be really low for that? I'll run another test to check and post the numbers.
I'm ok with replacing the pump, but would rather put in an updated unit if possible. Can anyone tell me from experience if these can be updated or do I have to order the more expensive old type again?
I'm ok with replacing the pump, but would rather put in an updated unit if possible. Can anyone tell me from experience if these can be updated or do I have to order the more expensive old type again?