My MERCRUISER 140 INBOARD blew up?

Question

Its an old model. The block is by GM. 4 cylinders. Mercruiser does not support this model anymore.

What GM car parts can I use as replacement and what complete car / boat engine can I fit to the existing sterndrive?

Anyone out there faced with this same problem?

Answer 1

You have a great answer here. Before you panic, see how much damage was done to the block.  If the block is not damaged to bad, see if it is repairable.  New pistons, bore, sleeves, crank, etc.  The only caution here, is some of the older motors were designed to run backwards.  The real old ones.  The biggest thing, is the oil slinger machined on the crank, may be backwards.  Just check that before you put in a crank from an automotive store.  You might be able to have the old crank welded up and ground.  We do it all the time on car and truck engines.  The older GM 151 cu. in. motors (2.5) are mostly the same on all GM cars.  They were and are a very tough engine.  (Iron Duke).  Check with a marina that's been around for a long time for input.  Good luck.

Answer 2

I'm pretty sure they used 4 cylinder 151cubic inch Pontiac power plants in the older ones ....

Answer 3

Get an estimate from a Mercruiser certified mechanic to have a new or remanufactured marine engine installed in your boat.

DO NOT USE A VEHICLE ENGINE.  Marine engines are designed and built for that purpose.  Boat engines run at a higher RPM for an extended period 4500-4800 rpm at cruising speed.  Vehicle engines run at a much lower RPM 1500-2000 at cruising speed.  A vehicle engine or your block rebuilt with vehicle parts will not last very long making it a waste of money.

Answer 4

Depends on what Blew up. What is damaged. As stated it is a GM engine. Look on your block, usually around the side the starter is on. There will be some raised numbers, write this down. I have a machinist that does everything machinists do, one is rebuild engines. I can give him these numbers and he tell me what engine this is. Maybe you can try a good machinist or even a Auto-Parts store and they tell you what engine this is. Example, Chevy LUV truck engine, Pontiac, Oldsmobile etc. Most of the parts may be fixed/found by a good machinist.

Years ago we had a 120 four-cylinder and it was the same as a Chevy LUV truck. Had a 165 six-cylinder and it was a straight six from Pontiac (If I remember correct, may been Oldsmobile, but one or the other).

Answer 5

Call federal Mogul for the parts  you need.