replacing engine

[roy67ss]

Hi guys,<br />Well, some bad news. I discovered that the block in my boat is cracked. I plan on replacing it with a car engine. I will of course, use all of the external parts from the boat. <br />Should I also change anything internally?<br />I read that the camshafts are a little different. Should I use the one from the boat engine? <br />I believe that the car engine is still a standard bore and was running very well when taken out.<br /><br />Thanks,

 

[McKenzie]

Re: replacing engine

What application was the engine used? If it was a tow vehicle, RV, etc. the factory cam will most likely do. If it was for a light duty application, switch it for a marine cam.

 

[roy67ss]

Re: replacing engine

Are the heads, oil pump, anything else internal, different?<br />I could easily change everything - crank & pistons - if the bore is still stock.<br />FYI- all the freeze plugs in the boat engine are steel and I'm sure it was still original engine with only 450 hrs.

 

[JasonB]

Re: replacing engine

The freeeze plugs, cam, and head gaskets for sure are different. Carb, alternator, waterpump, etc are all different. What is an OMC 185 engine wise? Ford 302?

 

[roy67ss]

Re: replacing engine

OK , pulled the engine today, I think I'm going to change everything over to the other block except the crank and pistons. I'll save them for a rebuild down the road if necessary.<br /><br />FYI, it is very easy to pull the engine without touching the drive, which is contrary to the Clymer manual and also eliminates a lot of adjustments. This way there are none !!<br /><br />Should be running again tomorrow !!<br /><br />Does anyone know if a person should use intake gaskets with restictors in for the exhaust crossover ?? The manual says nothing about this so I will assume that they should be open unless someone can tell me why they should be restricted.

 

[magster65]

Re: replacing engine

You can't just swap pistons, chances are there will be something out of whack. A couple things... I'd definately swap the cam, make sure each lifter goes back on the same lobe or get new ones and put in a new oil pump. For your exhaust crossover I'd put in the restricter plate with the small opening. Boats ice-up really bad in damp/cold conditions... what's in your old motor's crossover?

 

[roy67ss]

Re: replacing engine

The icing up problem would be a reason to leave it unrestricted to get the maximum cross-flow under the carb. There was no restrictors in the screwed boat engine, but I don't think that the intake was original as the casting date is way newer and that was why I asked the question.<br /><br />Pistons can be reused - you just have to know what you are doing. I will NOT be using them in this rebuild, as I stated.

 

[magster65]

Re: replacing engine

True about the cross-flow but it also costs you power by heating up the fuel once the engine is warm. Either way will work. Re-phrase; You could use the pistons again but why bother? Pistons don't wear evenly and neither do the bores so changing used pistons from one engine to another won't give you the service life of a straight re-ring or new ones.