sillydilly
Seaman
- Joined
- Sep 10, 2012
- Messages
- 62
hi all. I've posted here a few times about an engine swap but I'm still having problems.
RECAP.
bought a boat with a cracked 5.7 2bbl Mercruiser. Bought a good truck engine off a family member and did the swap. Came with block and heads complete and never taken apart. everything else was marine (I did swap
out cam). Ran fine in driveway for an hour at operating temp. I took it for a test run on the water and within 5 minutes I had water in the oil. I cannot pinpoint where it came from.
INTAKE MANIFOLD
first suspect. had this magnaflux tested and it came back okay. Though it was out 0.002 and 0.003 in some places, machinist said its fine to use but at the edge of "do I mill it flat"? So intake seems fine
EXHAUST MANIFOLDS
although usually a problem after sitting - I checked the exhaust manifolds by capping off at the riser and sealing the water jackets from exhaust. applied 20 PSI at the drain valve and dipped it under water. no bubbles at all came out of the exhaust or anything after 20 minutes
EXHAUST FLAPPER
known to fail and suck up water during a fast trailer launch, or sudden decel and engine kill. I only stuck my hand down the pipe and felt both were intact, springy, squishy, uncracked and damaged. will
follow up with a boroscope check to be sure.
CRACKED BLOCK
although highly unlikely, this block came out of a good running mechanic owned truck that didn't use oil or antifreeze.
What are some other suspectable culprits I can look into? head gasket ?
Thanks ! (I look forward to bondos advice )!
RECAP.
bought a boat with a cracked 5.7 2bbl Mercruiser. Bought a good truck engine off a family member and did the swap. Came with block and heads complete and never taken apart. everything else was marine (I did swap
out cam). Ran fine in driveway for an hour at operating temp. I took it for a test run on the water and within 5 minutes I had water in the oil. I cannot pinpoint where it came from.
INTAKE MANIFOLD
first suspect. had this magnaflux tested and it came back okay. Though it was out 0.002 and 0.003 in some places, machinist said its fine to use but at the edge of "do I mill it flat"? So intake seems fine
EXHAUST MANIFOLDS
although usually a problem after sitting - I checked the exhaust manifolds by capping off at the riser and sealing the water jackets from exhaust. applied 20 PSI at the drain valve and dipped it under water. no bubbles at all came out of the exhaust or anything after 20 minutes
EXHAUST FLAPPER
known to fail and suck up water during a fast trailer launch, or sudden decel and engine kill. I only stuck my hand down the pipe and felt both were intact, springy, squishy, uncracked and damaged. will
follow up with a boroscope check to be sure.
CRACKED BLOCK
although highly unlikely, this block came out of a good running mechanic owned truck that didn't use oil or antifreeze.
What are some other suspectable culprits I can look into? head gasket ?
Thanks ! (I look forward to bondos advice )!