1980 OMC Stringer 400 / 140

[hmmhesays]

Hello,
Recently I acquired a 1980 OMC Stringer 400 / 140. The engine needs a new set of rod bearings. The lower unit however, is in perfect working order, well taken care of and in working order. I cannot find an original service manual, I was wondering if the Seloc manual http://www.selocmarine.com/cart/product_detail.cfm?item__code=3400 is detailed enough for me to take this engine out and replace the rod bearings and also service the lower unit or is it vague and generic.

Thanks

 

[Bondo]

Re: 1980 OMC Stringer 400 / 140

or is it vague and generic.

Ayuh,............. That Pretty Well Sums it Up.................

 

[hmmhesays]

Re: 1980 OMC Stringer 400 / 140

That good huh? I'm more concerned about doing regular maintenance on the lower unit than getting the new rod bearings in. All I really need for that are the torque specs, if the engine is similar to a non marine engine.

 

[KaGee]

Re: 1980 OMC Stringer 400 / 140

Try RAPIDO MARINE DOT COM for a rebuilt long block or short block.

 

[Bondo]

Re: 1980 OMC Stringer 400 / 140

This Might Help you out, I don't now if it covers your motor,+ drive,....
I really Don't Do OMCs.......

I would Think that the Specs,+ Limits for a Merc 3.0l, 140hp of the Same Vintage would be the Same,......

 

[hmmhesays]

Re: 1980 OMC Stringer 400 / 140

KaGee thanks for the info, but all this engine needs are a set of rod bearings. It would be a bit overkill for me to purchase a whole new long/short block.

 

[whywhyzed]

Re: 1980 OMC Stringer 400 / 140

under what circumstances could an engine just need rod bearings? I can't think of a scenario...except maybe someone lost them out of the kit during a rebuild.
If the rod bearings failed, it was due to lack of oil, or poor quality oil, or debris from contamination or a failure elsewhere in the engine.
If the rod bearings simply wore out, your engine would have to have 4000+ hours on it and everything else inside would also be wore out.

 

[fendersfender]

Re: 1980 OMC Stringer 400 / 140

i agree......a marine engine is not the place for a "hillbilly" rebuild......if it needs rod bearings, then it needs much more than that.......not too many tow trucks on the water......

 

[hmmhesays]

Re: 1980 OMC Stringer 400 / 140

Let me add a little more information...

It needs rod bearings for sure. I will diagnose the rest once I get the boat out of storage.

 

[whywhyzed]

Re: 1980 OMC Stringer 400 / 140

When one or more rod bearings go, the crankshaft rarely survives. Once the crank's coming out, your further ahead $$ wise to buy a long block from Rapido.

 

[hmmhesays]

Re: 1980 OMC Stringer 400 / 140

The block is cracked, and it looks like it has been that way for a long time. There was metal embedded in two of the pistons.

Fun fun, looks like it is a trip to the local boat junkyard for me.