Thread: leak down test fail ?
08-27-2012, 08:09 AM #1
leak down test fail ?
put my motor all back together, did leak down and it lost about 2 to 3 psi in 5 min. i pinpointed where it was leaking. its leaking where the collar meets the crank, not between the collar and the crank seal. how the hell are you suppose to fix that ? if needed
08-27-2012, 08:10 AM #2
collar and seals are all new
08-27-2012, 09:23 PM #3
08-28-2012, 08:13 AM #4
the seal is oem, the seal is fine thats not what is leaking. theirs a bushing that goes between the crank and the crank seal, its leaking from that bushing where it meets the crank, not where it meets the crank seal
08-28-2012, 12:51 PM #5
Did you put any grease on the collar before sliding onto the crank?
08-28-2012, 05:37 PM #6
- Join Date
- Jun 2010
- Milwaukee WI
Is there an o ring that goes behind the collar? There is on a Polaris, wondering if a yamaha is similar.
08-29-2012, 05:50 AM #7
No I had to press the collar on, but I did put grease between the collar and the crank seal. And yes there is a seal that goes on the front it sits in the coupler
08-29-2012, 08:46 PM #8
Just make sure it's not leaking from anywhere else, and finish your assembly. Oil from the engine should seal it.
If you are really paranoid, then pop the bottom off the case, clean the mating surfaces again, and this time add more grease where the seal touches the crank. You should be able to do all that in 1-2 hrs.
08-31-2012, 07:50 PM #9
No, he's talking about this collar that is pressed on to the crank. Both Crank Seals seal against this collar. He is saying the leak is in between the collar and the crank.
I can't see how air could leak past this pressed fit. But you could pull it back off and smear some anaerobic sealer in between there and that should seal it. I didn't use any sealer or grease there. I just dry pressed it on...IIRC. My PTO coupler has an oring on it so maybe that seals it up.
08-31-2012, 08:47 PM #10
Yea I don't get how its leaking but it is.
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