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Thread: leak down test

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    leak down test

    How long do I need to let the threebond sealant cure before attempting a leak down test. I tried it about an hour after attaching the flywheel housing and I think I may have blown the sealant out of the joint. What is an acceptable pressure loss over 10 minutes?


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    I don't like to see any pressure loss in ten minutes. But, there should be no pressure getting into the front housing. If you can pressurize the crankcase and the air leaks into the front housing then you need new crank seals.

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Threebond 1211 is a slow curing silicone. Should wait a least 24 hrs before leak down test.

    How much psi did you use?

    http://www.greenhulk.net/forums/show...ight=leak+test

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    10 psi

    ---------- Post added at 08:42 AM ---------- Previous post was at 07:18 AM ----------

    I just tried it again this morning. Loses 3/4 psi in 10 minutes. Using soapy water, there is a very slight leak at the exhaust gaskets. Will this seal up on its own after being run a few times, or should I just put some copper spray on the gaskets? By the way, this is a new rebuild with all new seals and gaskets.

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I would double check your bolt torques and make sure they are up to spec.

    If they are not loose, copper spray would be my next option.


    Just a Q for curiousity sake, did you temporarily install the exh manifold prior to torquing the cyl nuts down?

    If you torque the cyl base nuts first, then install the exh manifold, when you torque the man bolts it will "pull" the cyls into alignment and compromise the seal

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    I did install the exhaust manifold first, lightly tightened down. I am getting the slight leak across all 3 cylinders. If the cylinders werent aligned I would think I could get at least one of them to seal up. Im going to go get some copper spray right now. Im sure that will do the trick. The leak is ever so slight. I pulled the manifold once and noticed some old gasket residue that I missed, so I cleaned that off and it got better.

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Make sure the old gasket material is all gone for sure.

    What gaskets are you using? I'm assuming the Cometic metal ones?

    I found some gasket material that leaks air like a sieve...

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    Polaris OEM gaskets. I just used the copper spray and I lost less than 1/4 psi over 15 minutes. I think I can call that good enough.

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    1/4 psi over 15 mins is xlint!!!!!

    Run with it.

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    my 700 lost that much in about 2 hours

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