924Board.org

Kenodog · Joined: 25 Jun 2003 Posts: 2669 Location: Vancouver,B.C.

So my car is up and running. Not tuned yet and the vaccuum system needs to be finished but otherwise she's good. I have a small problem though, there is a bad rattling sound coming from the POV on the turbo. The unit was rebuilt before it was installed and I personally put the new urathane gasket on the sides of the POV. Anyone have ideas what this could be ? There really isn't much inside it...

Thanks,
Leigh
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1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

Grenadiers · Posted: Sat Jun 06, 2015 2:07 am Post subject:

How's that little rubber elbow doing these days? If there's a vacuum leak, the piston might rattle, not held in place. Or, I'm backwards on that theory, can't remember!
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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

924.org has a write-up on fixing this...it involves putting a link in the spring so there's less clearance between the coils and the bore of the valve.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Kenodog · Joined: 25 Jun 2003 Posts: 2669 Location: Vancouver,B.C.

Grenadiers I think you nailed it. The vaccuum system isnt fully assembled they tell me. Its what is left for me to finish (and some new wiring harnesses...

On the plus side, motor is in and runs.

Leigh
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

Josh931 · Joined: 03 Oct 2014 Posts: 29 Location: South Africa

@Rasta, I've read the garage guide that you put the link to, thank you, I however just don't understand how doing as the guide instructs will help. I have the piston and spring in front of me. My POV had a nasty rattle as others have mentioned so decided to take a crack at it.

My spring was actually slightly longer than the one the guide link mentions, so no need to stretch mine, But I just can't see how if I bend the one side of the spring, (where it ends), outwards on the piston side and inwards on the guide side that this would solve the annoying rattle. I'm thinking the rattle would have to come from the play between the bore of the piston with the spring, but how would one fix that? Or is bending the end coil sufficient to counter the play between the bore as well?

Sorry if the problem is actually a lack of reading on my side, but most of the posts on the forum tend to just send the link without further explanation.
Thank you for your time!
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1990 Suzuki J410 sold
1985 Alfa Romeo 2.L GTV sold
1992 Honda VFR400 written off
1980 Porsche 931 going strong,,,well sort of