84 OMc 5.7 problems

[hydro556]

My buddy just bought an 84 deck boat with an OMC 5.7 I/O. The motor has blowby. Additionally, he took it out the other day and it got hot. 260ish hot. Water pump in the lower unit went out, he said. What is his best route to try and get it going for the summer, and then rebuild this fall? He is willing to do the rebuild if thats the way to go. Or should he get a rebuilt motor? If so, where is the best source to get the parts? Any general opinions of the process from those more experienced would be great.

 

[Coors]

Re: 84 OMc 5.7 problems

Engine is trashed, need to replace impeller.
Read old threads in here, while looking at a oem manual, will be the best bet.

 

[hydro556]

Re: 84 OMc 5.7 problems

What does a complete rebuild of this motor entail? Where is the best place to get a complete rebuild kit for this motor? What kind of machine shop work should he expect? I tried to talk him out of buying the boat, as it needs a lot of work. The floor is weak as well as having the engine problems. He says he can fix it all, but I am afraid he is going to have too much in it when all is said and done. Anybody care to venture a guess as to how much he will have tied up in parts when he is done.

 

[hydro556]

Re: 84 OMc 350 problems

Re: 84 OMc 350 problems

What does a complete rebuild of this motor entail? Where is the best place to get a complete rebuild kit for this motor? What kind of machine shop work should he expect? I tried to talk him out of buying the boat, as it needs a lot of work. The floor is weak as well as having the engine problems. He says he can fix it all, but I am afraid he is going to have too much in it when all is said and done. Anybody care to venture a guess as to how much he will have tied up in parts when he is done.

 

[Coors]

Re: 84 OMc 5.7 problems

Jasper, or other people will pop in with others. $2400 with out labor.
flor, a lot of time, about $1000 if the foam is not wet; etc
The drive-???

 

[hydro556]

Re: 84 OMc 5.7 problems

Thats about what I figured. He says the outdrive is fine. What about rebuild kits if he chooses to go that route instead of a reman engine?

 

[Coors]

Re: 84 OMc 5.7 problems

A reman from Jasper has a 18 month warranty, and it is not a rebuild.
There are other remans, but can't remember the names.

 

[hydro556]

Re: 84 OMc 5.7 problems

He is talking about trying to rebuild it himself. I am trying to locate a complete rebuild kit for marine engines with no luck. Should you just use regular automotive rebuild kits?

 

[Coors]

Re: 84 OMc 5.7 problems

Yeah, you could. But buy a warranty engine- cheaper in the long run.

 

[180shabah]

Re: 84 OMc 5.7 problems

Should you just use regular automotive rebuild kits?

Sure but there will be a few differences. Head gaskets, core plugs and cam to name a few. When chosing the Cam, think high torque/low rpm and never get one with an LSA over 112deg.