Crank case water ingestion after ski sits

Joined
Apr 21, 2016
Likes
42
Location
Lebanon Pa
#1
Running a re-sleeved 1050 gp800 motor on a 5mm stroke for the past 2 years and have noticed that occasionally the motor would hydro lock for a brief few cranks than clear up and run again. This season after a complete tear down and rebuild with fresh gaskets I get it out in the water and it’s running funny as normal, bring it in the adjust low speed screws and find it water locked again. Pull the plugs and the rear cylinder is pulling up massive amounts of water from the case. This has been somewhat of an issue on multiple rebuilds and only now have I seen it be this bad. Any thoughts? Going to take it home for a leak down test, I’m leaning towards a gap between cylinder and sleeve or a cracked exhaust manifold. Anyone have any similar issues?? Love these issues right at the start of our season!
 

Quinc

Buy a Superjet
Joined
Feb 19, 2013
Likes
5,632
Location
California
#2
Do a leak down test on the cylinder water lines first. Also are you running a water box? Water could be coming up through the exhaust.
 
Joined
Apr 21, 2016
Likes
42
Location
Lebanon Pa
#3
Do a leak down test on the cylinder water lines first. Also are you running a water box? Water could be coming up through the exhaust.
Just started running a box this season actually, issue didn’t go away, I had always assumed water was backwashing from pipe and spray fitting but never knew the case was filling
Will do test and post
 
Joined
Apr 21, 2016
Likes
42
Location
Lebanon Pa
#4
Fabricated Ex. manifold block off plates and did 70psi hose tests to make sure I had no leaks
Everything held
it’s this first gen WDK manifold
Can only get 3/4 bolts on the manifold by design and it’s spraying water into my exhaust ports
Guess I should have figured
Now I have to find the newest manifold or see if I could somehow cut bolt holes into this one without catching the coolant tunnels.
 
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