Possible Major Engine Problems on 657X

[Andy4k6]

Hi Guys,

I'm back again, I'm not posting this in my build thread as I am looking for more people to see it.

I have removed the cylinder head on one of my engines and found the mess you can see below.

First of all is it normal for the water jackets still to be full of water weeks after the engine was last run? If not what is the likely cause of the trouble?

With so much corrosion inside the engine has anyone found a solution to sealing the engine back up as the seal will no longer hold itself in. I am currently considering bonding the seal in place on the sides and bottom with some bonding sealer once that is set I would then put the head on with some more bonding sealer on top to seal it to the head. The bore looks great and the compression is good so I don't wish to replace the engine or have to strip it further if I can avoid it.

I am also in 2 minds if I should strip my other engine, I currently have 2 head seal kits on the way over from the USA and I was intending on fitting both however as this engine is dry when running on the hose and the compression is good as well I am tempted to leave it well alone and see how it performs and cools once it's on the water.

Many thanks

Andy

This is exactly how I found the engine when I took the head off







This is after pulling some of the seal out, cleaning the engine up a little and sucking some of the water out.

 

[Coastiejoe]

I believe it is suppose to drain. Normally caused by 2 issues. Sand in the jacket not allowing it to drain and the actual drain is plugged not allowing the water to drain out.

 

[Matt Braley]

Yes that water should run out to the exhaust manifold and drain down out of the 5/16" fitting. It is obviously plugged with sand and salt sludge.

If you can get it to seal again it will last for a while but you can see where the salt water has not been kind. A good welder of aluminum may be able to rebuild those areas that hold the head seal.

 

[Andy4k6]

Thanks for the advice,

The white does not appear to be salt at all it all seems to be aluminium corrosion although it does look like salt.

Should I expect the other engine to be the same?

This boat has been stood for around 10 years before I bought it, I wonder if the engine has been full of water all this time which has caused this issue of corrosion?

Many thanks

Andy

 

[Matt Braley]

The "salt" I'm referring to is salt water use. If you ride salt water and don't flush afterwards you get the result you just found. I'm surprised you didn't break any bolts getting it apart.

 

[Andy4k6]

Tbh I did break one bolt, although when I opened it I thought I was lucky.

I went back to the boat this afternoon and removed the pipes from the bottom of the manifold, when I did the water drained out leaving a ton of wet sludge. I blew down the pipe and did find a slight blockage but easily cleared.

Now my concern is the other engine I pulled the manifold drain of that one which again drained out but there was no blockage in the pipe at all.

So now I'll have to take the head off the other engine tomorrow and deal with all that crap but my concern is why if the pipe is free and when removing the pipe off the manifold it is draining freely is it not draining it's self?

Andy

 

[wfo speedracer]

I would get another set of cylinders 657 parts are dirt cheap.

 

[Andy4k6]

Unfortunately I'm in the uk and replacement cylinders are not cheap or easy to find and importing them is too expensive unless I need to have them.

On a plus note I stripped the other engine and had much better luck, the cylinders look to be in great shape on this one although I still have a ton of jelly sand and general crap to remove before I can rebuild it.

I have also checked the drains on both manifolds and both keep blocking up after i free them off so I'm going to have to remove the exhausts and manifolds so I can clean everything properly and then test the drains are flowing properly.

Here's a photo of the other engine