my 84 merc 140 is cracked????

[8595transam]

Local boat yard has a 79 120. Will I notice much of a power difference if I go with the smaller motor? What about putting the 140 cam in the 120? I'm use to working on v8 engines so these little 4 cylinders are new to me.

Any and all help is appreciated

 

[cooter2506]

Re: my 84 merc 140 is cracked????

I think you will notice the 20hp difference. I would contact Rapido marine and see what a fresh long block would run ya

 

[8595transam]

Re: my 84 merc 140 is cracked????

Ive contacted them and he said they no longer carry the 4 cylinder engines.

 

[Bondo]

Re: my 84 merc 140 is cracked????

Ayuh,... It'll probably be Noticable...

The Cam is pretty much irrevelant, it's the Displacement...

 

[8595transam]

Re: my 84 merc 140 is cracked????

That's what I thought. No replacement for displacement. Maybe I'll see if the crack can be welded.

 

[Bondo]

Re: my 84 merc 140 is cracked????

Ayuh,... Where, Exactly is it cracked,..?? How many places,..?? How Big,..??

 

[rodbolt]

Re: my 84 merc 140 is cracked????

last I looked a complete,less manifolds but with a distributer,3.0L long block assy was about 2000 dollars.
its also why most folks no longer rebuild them.

 

[8595transam]

Re: my 84 merc 140 is cracked????

Will a 76 model 140 swap over without any issues? Found a good deal on one.

 

[Bondo]

Re: my 84 merc 140 is cracked????

Will a 76 model 140 swap over without any issues? Found a good deal on one.

Ayuh,... It Should....

 

[cedarjunki]

Re: my 84 merc 140 is cracked????

Will a 76 model 140 swap over without any issues? Found a good deal on one.

the only difference from old to new/new to old is the manifold.....just use your manifold,carb,alternator.... besides in my opinion...the older ones were built better anyways, i think gm started recycling metals around mid 70's