Realistic price to rebuild a 3.0 140 vs buying reman

[demian5]

"If you pull spark, and the noise goes away, I'd start thinking rod or piston issue."

I did that and it went away. I swapped a lifter as well and it didn't change. Ill get compression numbers and pull the motor. Time to order ANOTHER engine gasket set. Im hoping a wrist pin issue that hasn't scored a cylinder. That would be the easiest fix that involves not pulling the crank.

Do they make a 1-piece oil pan gasket for these yet?

[demian5]

Pulling this week. I pulled the drive then ill get a compression test and oil pressure test with a gauge before I pull it just so I have those numbers. Any other "pre-disassemble" tips i should check? Like I said before, this engine looked rebuilt when i got it, but the likely cause was it was rebuilt, had this noise, and guy gave up.

[Plugcheck]

 Can't think of any pre tests, other than what you have already done.  The spark removal that clears the sounds should key on the cylinder to look a bit more closely at.  I would imagine if you did a full rebuild, and with proper care, that 140 would Outlast the boat.

[Jason]

Must have been an old OMC long block since it's blue.

[demian5]

Yes its an OMC, and the compression across all 4 was a shade under 150 (148/149) with 30-50 PSI of oil pressure between idle and rev to about 2500.

[Jason]

Sounds pretty healthy.

[demian5]

Well I got it apart, some scored cylinders and bearing wear. #2 and #3 had pretty tight wrist pins with #3 as the most scored cylinder and piston. No metal in oil or pan... Damn thing looks like all the parts are new too. Std/Std crank as well that can probably just get a good polish.

Ill get it to the machine shop and buy one of those complete rebuild kits on amazon for $400. Chip in the cam gear as well (still plastic)

[demian5]

Dropped it off at the machine shop yesterday. Amazon has a nice rebuild kit with everything but cam and lifters for $350. When I get the engine specs back Ill purchase that one. Ill paint it black too and swap my mercruiser tag over to it.