Should this be happening

[The Garbone]

Installed my new manifold today. Started the motor for the first time and had the result of water coming out the exhaust port in addition to the output hose.

She ran fine bypassing the old manifold, pumped 5 gallons through the motor.

Hope this video works. Clicking may be required.

http://youtu.be/6pJZ0Oo5Ec0

I think I may need another manifold..

[Al Schober]

Not good. Remove the manifold and test it alone - should tell the tale.

[marthur]

I think I may need another manifold..

You may be right. I get only exhaust out of my exhaust pipe.

[Mo]

Not good. Remove the manifold and test it alone - should tell the tale.

I agree, pressure test the manifold. You don't need to remove it to pressure test it but a pressure test is necessary. A head gasket leak or crack could also cause water out the exhaust port as well, so you need to know if that manifold is good.

[ndutton]

Installed my new manifold today.

Whaddya mean "new"?

[The Garbone]

Brand new Moyer Marine, out of box.

With the old manifold no cooling water would flow through the engine. Bypassed the water jacket on that one and ran the motor fine pumping 5 gallons through the block. No water out the exhaust.

Ordered new manifold and gasket last week and installed it today.

I think the head is fine as I had no water blowing issues with the last manifold, think I got a dud casting.

I will do a leak test tomorrow, will remove the manifold and run water thru it in the sink. If it leaks out the exhaust, guess that is it..

[ndutton]

Maybe pressure test the next one (if that's the case) before installation??

[The Garbone]

I am just happy the motor is not in boat yet, would have been much harder to isolate it with the muffler attached.

We are scheduled to put the boat back in the water Thursday. Probably will still drop in the motor without the manifold anyway as I already have the day off work. The good news is I have everything else sorted out, the bad is I wanted to warm it up and change the oil one last time and fine tune the carb before putting it back in the water, looks like I will be wrenching on the boat.....

[hanleyclifford]

Did you seal the manifold studs into the block with Permatex #2?

[ndutton]

Not quite sure how leaky manifold studs could translate into water in the exhaust.

[Dave Neptune]

Block me thinks

Gary, there is no way a new manifold even with a crack should allow that much water by. For that volume you should be able to block with your hand and blow into it with yer mouth to test. Pressure checks are good for tiny leaks and that does not appear tiny. I'm guessing and hope I'm wrong but the block is my suspect here if both manifolds performed the same.
Any signs of water in the oil? Did you do a compression check? From the pattern I saw of the exhaust/water spray it seems to be an isolated cylinder from the pulsing, or a cracked exhaust runner would be my guess if the compression is OK.
Hope I'm wrong though.

Dave Neptune

[The Garbone]

Dave,

You may be right. I hope not but that is may just be wishful thinking on my part.

I will definately try the blow in it test when I get back to the house.

I did have to do an extensive buildup on the water jacket side of the block. And even though the oil looked fine at before the last start I could have had a catastrophic failure in the head or block.


However another possibility is there is a failure in the casting associated with 1 or 4 exhaust or intake. Most likely 1 as it travels the furthest. She idled pretty nice with the old manifold. Now once the water starts to flow I have to throttle her or she dies.

[hanleyclifford]

Not quite sure how leaky manifold studs could translate into water in the exhaust.

It can be surprising how much water can get out around a sloppy/dry stud end; remember all three go into the water jacket.

[joe_db]

Water can migrate into the manifold. Happened to me on my old engine.

Not quite sure how leaky manifold studs could translate into water in the exhaust.

[ndutton]

It can be surprising how much water can get out around a sloppy/dry stud end; remember all three go into the water jacket.

Due to the volume of water in the exhaust I was thinking block/head as Dave suggested but to respond directly to the stud discussion, even though the studs enter the water jacket none of them have anything to do with the exhaust. If they leaked into the area between the manifold and block the manifold gasket should stop it there.

After the stud comment and before I posted I examined the stud holes on my spare engine manifold. They are completely isolated from the exhaust. If they weren't, there's no way the manifold could be pressure tested off the engine.