Thread: Valve cover gaskets 300X
10-17-2011, 07:18 AM #1
Valve cover gaskets 300X
Just a friendly reminder to torque down your valve cover bolts. I had my valve cover gasket blow out in a moto of a race (which was also the first time I rode the ski) and my good friend just had the same thing happen on his with only 4 hrs on it. They both blew out at the front. To fix all we had to do was loosen the bolts, push it back in and torque back down. No problems afterwards.
10-17-2011, 02:02 PM #2
Did it blew on the front engine where the cam gears are ? I saw mine starting to get out a bit.
10-17-2011, 03:53 PM #3
- Join Date
- Sep 2011
I always torque mine several times during break-in; SOP
10-17-2011, 07:26 PM #4
Why I say, they are a step bottoming bolt.......
that means the are designed to bottom out and apply a set amount of equal tension to the gasket
no amount re-tensioning will get them any tighter..
the FIX for the gasket is to fully remove the VC and solvent clean all 3 surfaces and apply a small dob of 3bond on the begining on the 4 x cam reliefs in the head.
mostly the clean and DRY surfaces ensures the gasket cant slip and push out.............once its slipped out once I suggest remove clean and re assemble correctly.
08-13-2012, 05:11 PM #5
08-13-2012, 05:14 PM #6
if it blew at cyl 4 the seal obviously wasnt seated correctly.
08-13-2012, 08:02 PM #7
If your VC gasket is squeezing out, other engine problem may follow. It's not a loose-bolt issue.
Check your compression ASAP, better yet, do a leak down test.
08-13-2012, 08:28 PM #8
correct mgm when mine started to push the dipstick out it was only a matter of time before the lobes blew out on the gasket but they were forced from the blowby caused by excessive crankcase pressure from a holed piston.
08-13-2012, 08:41 PM #9
The JetSki has less than 25 hours on it so I think it's going to go back to Kawasaki... I'd really be surprised if I had a major engine failure because I constantly check the oil and changed it every five hours and then switch to synthetic motor oil after 20 hours.... but at this point unfortunately, that's what it seems like is going on.... Thanks for the advice.
08-13-2012, 09:12 PM #10
I'm going to have a friend come by and do a "leak down test". He is actually Kawasaki mechanic (even though his dealership does not work on jet skis), so it should be pretty accurate. I will post my findings here...
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