can loose exhaust manifold bolts cause water in cyl

[chris0061]

mercruiser 260 center riser manifolds. would loose exhaust manifold bolts cause water in piston cyl and cause hydrolock??????????

 

[Howard Sterndrive]

Re: can loose exhaust manifold bolts cause water in cyl

loose riser bolts sure could.

can't see how exh. mani bolts would, unless they rattled a round and broke up inside from the vibration...but it sure would be noisy...

 

[Don S]

Re: can loose exhaust manifold bolts cause water in cyl

Manifold th head bolts, No way. No water passages.

Risers to manifold. Absolutely.

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

So I got a riser problem?????? 6 and 8 show sighns of water

 

[Don S]

Re: can loose exhaust manifold bolts cause water in cyl

So I got a riser problem?????? 6 and 8 show sighns of water

Or the gasket surfaces between the manifold and riser.

Here are some things to check on the manifold and riser gasket surfaces.

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

OK Don I'll do that in the morning. I loosened the four bolts and re tighten them and ran it about 10 minutes on the muffs. I'll pull the plugs in the morning and crank it over and see if there is any water coming out. If so I'll pull the riser and look for cracks on the inside and check out the 1/4 inch surface and at best hope I can get by with new gaskets. Thanks for you ISO Don.

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

One other thought Don, Since it is a fresh engine you don't think it is a head gasket do you???? When I pulled that plug. number 6 and seen it was bad I turned it over and a milky oil came out of it. Just a thought as the engine is under a 1 year parts and labor warranty.

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

I am not getting water in the oil threw all this and compression is just over 150

 

[captmello]

Re: can loose exhaust manifold bolts cause water in cyl

I would take it back to the person who is giving the warranty. Don't start tearing into it.

Water in the cylinders is one thing, could be riser gaskets. But oil/water??

Did you put new manifolds and risers on when you got the new engine?

 

[legoman67]

Re: can loose exhaust manifold bolts cause water in cyl

we are having almost the exact same issue with our mercruiser 350. Got new manifold, and all the gaskets. going to try re torqing the intake manifold and the head tomorrow, install teh new manifold, and see if that solves it. Will let you know.

if that doesnt work its time for a new head gasket. no water in oil, water getting into cylinder, hydrolocking.... only 1 side(it may even be 6 and 8 aswell)

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

went out this morning and turned it over and water still coming out the two cyl. removed the riser and the 1/4 inch lip between the two gaskets show no sign of water leaking. there was however water sitting in the two cyl exhaust outlets inside. the other two were dry. When I turned it over clear water shot out so I don't think its the head gasket now. I'm going to go get a mirror and look inside the manifolds and see if I can see a crack. Also there was rust betweent the two gaskets around the back weep hole.

 

[Bt Doctur]

Re: can loose exhaust manifold bolts cause water in cyl

as long as the riser is off, remove the hose from the thermostat going to that manifold and use a hose to carefully fill the manifold to the top, let it sit and see if it leaks into the exaust section. Betting the manifold is leaking.
Had 2 cust with new merc manifolds and guess what ,both leaked in exactly the same spot, right between cyl`s 4-6 or 3-5

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

ah, good idea, I'll go do that now and let ya know what happens.

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

ok filled it up and its loosing somewhere, I could'nt see any dripping into the manifold but was dripping threw the bottom hose nipple were I took the hose to the thermostat housing off.

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

I think I did it wrong, I should take the hose off at the thermostat housing and fill it up there Right?

 

[Bt Doctur]

Re: can loose exhaust manifold bolts cause water in cyl

water seeks it own level, you take the hose off from the therm ,carefully fill it . raise the end to the level of the manifold,

 

[chris0061]

Re: can loose exhaust manifold bolts cause water in cyl

OK, I did that but I got something blocking the passage in the water jacket on the manifold. I cant blow threw it or fill it. I took the manifold off also now to bring it in out of the rain. What a way to work on a boat. anyway once I took the manifold off I put the plugs back in and cranked it several times with the oil pressure building to 40 pounds while I was cranking to get it all lubed back up till I can put it back together. Thanks for all the help