Hey, so I have a 94 701 square nose superjet freshly rebuilt motor with factory crank seal with the tites facing out, and the rear seal keeps popping out. The ski dosent backfire or anything. Has a factory B-pipe and a buckshot carb jetted accordingly, any Ideas on what it could could be causing it to pop out?
Crank seals
- Thread starter Big mike
- Start date
SuperHumanJetski
keep it simple
- Location
- Grand Rapids Michigan
Pics? Do you have both seals on properly in the rear? Pitting damage to the case? Something is wrong.
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SuperHumanJetski
keep it simple
- Location
- Grand Rapids Michigan
Btw instead of pulling the motor completely apart, you can take it out of the ski, turn it upside down, pull off bed plates and the bottom case half. From here you can place the Pistons at the same level on the cylinder and lift the crank out just enough to change the seals. Make sure you don't pull the Pistons out of the cylinder or you'll have to take it apart again. There are 3 seals and they are all different. The flywheel side is obvious. Tits out. The rear side make sure the seal without tits is on the inside and make sure the one with tits is facing out towards the coupler. Now that the seal popped out you have to split the cases to do it again. It's poopty no way around it. Make sure the lip on the seal isn't ripped from popping out or defective
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SuperHumanJetski
keep it simple
- Location
- Grand Rapids Michigan
Clean any grease and oil off the surface where the seals sit. I usually bolt it up after that. Some people use hondabond or whatever around the seals as an added measure but not necessary.
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SuperHumanJetski
keep it simple
- Location
- Grand Rapids Michigan
You're going to have to redo the case gasket too. Idk what you used for that but it's gotta be semidrying gasket. I forget what I use but someone here knows what's proper
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SuperHumanJetski
keep it simple
- Location
- Grand Rapids Michigan
Yeah sorry the 8 hours is a sunk cost at this point. You have to split the cases again or abandon ship. I can do this in an hour and a half. Shouldn't be too bad with the method I just posted
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SuperHumanJetski
keep it simple
- Location
- Grand Rapids Michigan
Do you have matching case halves?
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SuperHumanJetski
keep it simple
- Location
- Grand Rapids Michigan
Is your stator in the proper position? Do you have MSD? Backfiring is usually caused by one of these. If the ignition timing is effed that could be your problem. As far as I know a bad crank seal is not going to cause backfiring. Your issue is somewhere else.
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