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  1. Dubed

    Blowby through vent tube? Mercruiser 3.7

    Yes just an open bung on the valve cover. Hose runs from it to the carb
  2. Dubed

    Blowby through vent tube? Mercruiser 3.7

    No pcv. Shop owner was familiar with the motor. Knew all about it. And Uncle Bucks car was awesome!
  3. Dubed

    Blowby through vent tube? Mercruiser 3.7

    Agreed. My question is.... would all that oil coming out of the vent tube and being pumped through the carb cause that? After all, it isn't a 2 stroke
  4. Dubed

    Blowby through vent tube? Mercruiser 3.7

    That's what I'm seeing. They were dry and cooked though. I would assume oil was going by #2 cylinder. I was also thinking it was from all that blowby dumping into the carb from the vent hose. Would that be a wrong assumption?
  5. Dubed

    Blowby through vent tube? Mercruiser 3.7

    I have a Milwaukee at work. I'll bring it home tomorrow. Shop told me to leave it the way it is and bring the carburator with it... not sure why. To see if it was running lean?
  6. Dubed

    Blowby through vent tube? Mercruiser 3.7

    Ok, I ran home and did a compression test. #1=150+, #2=110, #3=150+, #4=140. Obviously piston and or rings in #2 is burnt. Not sure why or what happened. Motor shop said I probably detonated piston... timing was set at 4°btdc. I have to pull it so they can take it down and look at it. Plugs were...
  7. Dubed

    Blowby through vent tube? Mercruiser 3.7

    Yes broke in according to the shops instructions. In the driveway at first, then re-torqued the head. On the water three trips up and down the Rpm range (never over 3000). Avoided idling for long periods of time and tried to keep above 1800 rpms per their request
  8. Dubed

    Blowby through vent tube? Mercruiser 3.7

    Thanks. Yeah it sucks. Boat sat for 6 years covered in the yard. I decided to restore with new custom fuel tank, new stringers, wiring, electronics, new trailer and on and on. Brought it to a very reputable race shop because I wanted it done properly and have no issues. Ugghh! HOPEFULLY THEY...
  9. Dubed

    Blowby through vent tube? Mercruiser 3.7

    Thank you.
  10. Dubed

    Blowby through vent tube? Mercruiser 3.7

    Thank you. Thats not good. As long as theres nothing else for me to look for. I just wanted to get my ducks in a row before I call the motor shop and see what they are prepared to do about it.
  11. Dubed

    Blowby through vent tube? Mercruiser 3.7

    By the way, Thank you very much for your reply
  12. Dubed

    Blowby through vent tube? Mercruiser 3.7

    I will have to find the paperwork on it and get back to you. Best of my knowledge, it was bored, new pistons, rings, bearings, cam, head was re-done, etc. ect. It cost me close to $4K if I recall. Will get back to you with compression test and leakdown results. A valve wouldnt cause this would...
  13. Dubed

    Blowby through vent tube? Mercruiser 3.7

    Good morning folks. Have a 1986 3.7 190 hp Mercruiser. I had entire engine rebuilt and have about 15 hours on it with break in oil and another 10 to 15 hours on fresh oil. I did prime the oil before first starting and again before starting this season. Engine was fogged before laying up through...
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