Identifying model number on OMC in/outboard motor

There's another thread with the same question, but didn't want to hijack that thread.

Anyways, helping a buddy rebuild his motor and will need to start getting some parts soon as the motor is almost done and ready to get fired up. It's a 5.8L Windsor Ford block.Not sure S of yet what parts are special for a marine application vs automotive. Right off the bat we're going to replace both water pumps (engine driven and lower unit/stern drive thingamajiggy pump) and the fuel pump.

I'm a little out of my element as my marine experience is all outboards while I'm a diesel mechanic by trade. Want to help my buddy get this boat back in the water.

Is there generally an ID plate on or near the motor that has model number on it? Believe it's an 18' or 20' Bayliner from 1989.

why are you rebuilding it? search up some threads on pressure testing the block before ordering any parts.
the parts listings on this page have all the OMC parts books. You can search around that year and see if you see this engine.
some other good references:
why I hate the drive system on that boat http://www.hastings.org/~stuart/cobra/
how to fill the drive with lube so it makes it to the end of the lake more than once: http://www.crowleymarine.com/support/tech_articles/omc-cobra-outdrive-lubricant-filling.html
The screw you should NEVER remove: http://www.baylinerownersclub.org/media/kunena/attachments/vb/727086=32536-cobra drain 2.jpg
etc
http://www.hastings.org/~stuart/cobra/hints.html

The engine was seized in the boat when my buddy got it and was full of water. Ended up putting new pistons in it and boring it 40 over. Motor didn't have too many hours on it as it still had the cross hatching in the cylinders from it original bore.

This was a raw water cooled engine???
If so.... I'll caution you to NOT re-use the cylinder block.

Instead.... visit an Engine Rebuilders Supply company, and pick up a 5.8 core that spent it's life in a car or truck, with Ethylene Glycol surrounding the cylinders.

Have it bathed/baked, and checked for any signs of casting fractures.

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The Ford Windsor uses a wedge style combustion chamber very similar to the SBC cylinder head chambers.




I would recommend that you DO NOT place full dished pistons under these chambers for Marine use.

For examples;

This is a GM SBC full dished piston... and should be avoided for the SBC.




This is a 5.8L dished piston... but it offers a quench surface.
Note that the piston deck (the quench surface) mirrors the cylinder head quench surface fairly well.

See this thread beginning at post #7.

All of this can apply to the 5.8L Ford W engine that is destine for Marine use.
With a good quench built into the combustion chamber..... you'll end up with a better Marine Engine.

If you instruct your machinist to build a good Quench Effect into the combustion chamber...... he'll know exactly what to do, and which pistons to order.... and you'll end up with the correct static C/R, etc.
If they do not.... find another shop.

The cost to do this is peanuts.


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