Porsche Enthusiasts Club Forum
https://forums.tipec.net/

944 V-PULLEY 2.5 Engine noise.
https://forums.tipec.net/viewtopic.php?f=25&t=4735		 Page 1 of 1
Author:  zola1 [ Mon Jun 15, 2009 8:36 pm ]
Post subject:  944 V-PULLEY 2.5 Engine noise.
Had a metallic noise develop over the weekend from the front crank pulley area, noticed the PAS pulley appeared to wobble at idle.

Stripped out and found this ;-
Attachment:
PORSCHE V PULLEY END OF CRANK 002.jpg
Attachment:
PORSCHE V PULLEY END OF CRANK 001.jpg


The hole is oval (might not be to clear on pics), The 944 tech book quotes 210nm torque for the gear wheel to crank M16x 1.5mm bolt........ any thoughts if should be put in with locktite on the thread ?

cheers
Author:  Richy_S [ Mon Jun 15, 2009 9:33 pm ]
Post subject:  Re: 944 V-PULLEY 2.5 Engine noise.
Derrick

I have never used loctite on this - at 210Nm you shouldnt need it I guess.
Its one of those bolts I wonder about after tightening but havent had one come loose yet.

If you need to borrow a flywheel lock let me know.

Rich
Author:  zola1 [ Tue Jun 16, 2009 6:48 am ]
Post subject:  Re: 944 V-PULLEY 2.5 Engine noise.
Cheers rich, any idea what size dia the stub of the crankshaft is that it fits on ?
Author:  Richy_S [ Tue Jun 16, 2009 6:55 am ]
Post subject:  Re: 944 V-PULLEY 2.5 Engine noise.
I'm pretty sure it doesnt actually sit on the stub. I dont think that the stub protrudes from the balance belt gear. In other words I think the pulley sits directly against this gear which would make sense as the whole lot must push against the oil pump drive gear.

Bear in mind I'm going by memory though!!

Rich
Author:  zola1 [ Tue Jun 16, 2009 7:31 am ]
Post subject:  Re: 944 V-PULLEY 2.5 Engine noise.
you have about 5mm of the end of the crank that it appears to fit onto
Attachment:
SKMBT_C25209061608480.jpg


(bear in mind it was mishaped abit) ............
Attachment:
PORSCHE V PULLEY END OF CRANK 002.jpg


as a washer type fitting face to to face ,,how would it stay central ???any thoughts ?





thanks

derrick
Author:  starboard147 [ Tue Jun 16, 2009 9:02 pm ]
Post subject:  Re: 944 V-PULLEY 2.5 Engine noise.
You haven't included phots of the big washer that goes on the bolt - which, if I remember rightly, locates the pulley properly when it's tight. Mine did come loose however I was using it to lock the engine as I took the clutch and flywheel off. Having refitted it and torqued it to 210Nm, I can't see it coming off again, and it's been fine since...

Also, be careful when you tighten the whole back up again if you haven't taken the tension off the belts. The crank mounted drive wheel can lock on the woodruff key, resulting in the correct torque not being applied to the oil pump - hey presto, no oil pressure. Ask me how I know...
Author:  zola1 [ Wed Jun 17, 2009 7:36 am ]
Post subject:  Re: 944 V-PULLEY 2.5 Engine noise.
The washer has a recess machined into it, like a "top hat" shape.

I'm not a 100% but this is how i think it fits together :-

The v-pulley sits over the stub of the crank this leaves about 4mm at the very end for the washer recess to fit over snug, the the 24mm bolt secures it altogether.

UPDATE :-

Got it back together couple of notes below :-

Crank stub is 28mm dia, BTW the torque setting seems to affect the amount oil pressure,,, as i ran it up with out the pulley on..whilst carrying out diagnosis of the noise (fitted the washer and 24mm bolt), tighten the bolt , not to the 210nm spec and it was a good bar down on cold start up. The washer sits on the face of the pulley as the 4mm clearance is taken up by the thickness of the pulley... i'm thinking that when you tighten the bolt up to 210nm all the pulleys compress the oil seals and o-ring at the oil pump and there might be couple of mm of the crank stud to "pull" under the washer recess. anybody got any final thoughts ?

cheers




Attachment:
SKMBT_C25209061608480.jpg
SKMBT_C25209061608480.jpg [ 6.36 KiB | Viewed 2830 times ]
Page 1 of 1 All times are UTC
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/