The water in oil question

[metalwizard]

Yep I got water in my oil. 165 hp straight six omc 1973

I first noticed it when I started it up for spring. I had water POURING out the side of the head under the manifold, I found a freeze plug popped out. So I pulled the manifold popped a new one in. hooked up the hose. fired it up running good. bus STILL LEAKING.
Closer look there is a crack in the block just below the head line dead center. so I pulled the man again to take a closer look

My intake exhaust man is DEFINITELY cracked. in a few places AND on the square cap on the stern end. and the block is cracked too. about 2" long

Yes the engine froze. My drains were plugged and I did not know better so I did not drain it properly.

So I ran it for a little while before I decided where the leak was. I ALSO let the water run into the sterndrive with the hose. with the engine shut off.

is there ANY WAY the water could have come from me leaving the water hooked up and on and having a cracked manifold causing the oil in the water and NOT be an INTERNAL block crack?

What I am asking is it worth getting a new manifold, riser and the cap on the end of the manifold, JB the block crack and try it again.?

I do have a line on another motor but it will be a long process to get it and swap it, I'd hate to do it if I dont need to.

Thanks again

 

[HT32BSX115]

Re: The water in oil question

What I am asking is it worth getting a new manifold, riser and the cap on the end of the manifold, JB the block crack and try it again.?

Howdy,


Most of us would say NO.

Cracked blocks can be glued with epoxy and might not leak for a while and putting a new manifold on it would not damage it (you could use it on the "new" block),

But I would not to operate with a cracked block. For every one that works there's probably 10 that doesn't.

It isn't going to cost you much to try it (just the cost of the epoxy, your time wasted and additional down time when it doesn't work)


The 250 cu-in 6 is one of the most popular engines ever made. there's zillions of them languishing in truck wrecking yards all over the country.

You can easily find a suitable running engine and be back on the water in "no time". Just make sure that you get one with the correct front engine mount-points etc.......


That's what I'd do!


Regards,


Rick

 

[metalwizard]

Re: The water in oil question

thanks,

I was under the impression that the truck motors did NOT have the proper mounting holes.

also compression and cam profiles may be different. not to mention the external stuff but that can be changed.

 

[HT32BSX115]

Re: The water in oil question

thanks,

I was under the impression that the truck motors did NOT have the proper mounting holes.

also compression and cam profiles may be different. not to mention the external stuff but that can be changed.

A Lot of the truck blocks do not have the right mount points. Many do though. There' a local truck part place near here and they had around 15 250 cu-in GM 6's of which 4 or 5 were correct for using in a boat.

The cam profile in most 6cyl truck engines will work satisfactorily in a boat. They're low RPM "torquer's" ........just what you're looking for!

 

[metalwizard]

Re: The water in oil question

Thanks I appreciate the input