2.5 omc parts interchangeable with 2.5 mercruiser

[boatermarquis]

I got 1976 marquios with 2.5 omc will crankshaft pulley work on 81 2.5 mercruiser?

 

[Bondo]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

I got 1976 marquios with 2.5 omc will crankshaft pulley work on 81 2.5 mercruiser?

Ayuh,... It Should,...

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

It's strange.only reason I see that they did it is because block cracked and didn't want water pumping, and even stranger they run a belt from water pump to alternator like that's way suppose to be.there some seeks out there.i still want to fire it up and see, never know.

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

I meant some cheap skates.

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

I think I just realized something.are both these motors I got the same? I read the mercruiser have stronger crank.so are both these motors iron dukes?

 

[Bondo]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

I think I just realized something.are both these motors I got the same? I read the mercruiser have stronger crank.so are both these motors iron dukes?

Ayuh,.... Both long blocks, are Exactly the same,....

Neither are "Iron Duke"s,... which is a 151cid Pontiac motor,...

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

So these are the 153?

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

I know you guys don't like using car motors, but I have to ask.are there any compatible vehicle motors.i just need the block from one.i got two motors.with rest of the parts.ive been researching all day and found no answers.

 

[old islander]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

I believe that motor only came in a very early Chevy Nova. Back then, like early 60's they were called Chevy 2's. Very hard to find. It was also used in many brands of fork lifts.

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

Ok well maybe I'll look for the 4.3 and a matching outdrive.

 

[Bondo]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

Ok well maybe I'll look for the 4.3 and a matching outdrive.

Ayuh,.... Just What is yer ultimate goal,..??

What I've seen, you've bought 2 junk boats with dead motors,...

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

I like the caravelle.and want to get it on the water.but almost positive block cracked in it too.i see alot 4.3 boats with bad floors.might run across one and switch everything, but now realized mounts probly won't match up.unless I can find good core block 2.5.

 

[Bondo]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

I like the caravelle.and want to get it on the water.but almost positive block cracked in it too.i see alot 4.3 boats with bad floors.might run across one and switch everything, but now realized mounts probly won't match up.unless I can find good core block 2.5.

Ayuh,... A 3.0l will also bolt right in,.. same externally as the 2.5l,.....

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

There's this junkyard down the street that has like 30 forklifts, but think they were propane motors.im gonna go see

 

[thumpar]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

Bondo has the best idea. Try to find a 3.0l. You can just bolt up the stuff you have to one. The power will be better also. At some point Mercruiser stopped doing 2.5l engine and am pretty sure there are a lot more 3.0l engines out there.

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

On 3.0 is the top end parts the same.i do see alot them 120hp motors.

 

[thumpar]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

The 3.0l is a 140hp. The 2.5l is the 120hp.

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

The 3.0l is a 140hp. The 2.5l is the 120hp.

that's what I meant to write 140 sorry.So if I do find 3.0 will drive gears make any difference? Can I get different prop to even it out? Are the 3.0 and 2.5 same block just different heads had to ask that?

 

[thumpar]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

No they are not the same block but all the accessories bolt right up. The 3.0l has room in the cylinder metal to have a bigger bore. They both used the same drive ratio so you might have to go up in pitch but you won't know until you try it.

 

[boatermarquis]

Re: 2.5 omc parts interchangeable with 2.5 mercruiser

Ok that's what I wanted to know.i may have found me one.in a 86 model.outdrive bad.i have one more question.will any car motor bolt up to drive, and use same components like heads risers.do they have 3.0 gm? I know they say the motors are not built for marine, and won't last long.but I got to know.