Nine_five_one

Hey all,

I just got my 951 from the shop, I had them install the belts and some rollers. I notice now that it whines. Can the belts be too tight or loose?
Or some other thing?

thnks

iloveporsches

I believe they'll whine more when they're new, because the tension for new belts is greater than for older belts.

ERAU-944

they probably installed the belts a little on the tight side, anticipating the stretch. make sure that they retension, and actually retension after 1,500 miles. all our cars still whine a little, to me its come to symbolize the sound of the car

-Michael-

iloveporsches

Some say 1500 may be too soon for factory/ OEM belts. IIRC Porsche recommends 2500 miles, but don't quote me on that figure. Someone here should know for sure.

badass951

If your belts are whining then they are too tight. I am almost positive that this causes more stress on the waterpump and rollers, so it is probably a good idea to have them retensioned properly.

MHT

the belts will whine when they are new, 1500 miles is too soon to re-tension them, they will not have fully stretched at that point, then they will be too loose when they have, running the belts loose can dramatically shorten their life.

Matt H

The belt whine is the balance shaft belt being too tight. It makes that noise when it goes over the roller. I drove mine like that for almost 2 years without problem (except sounding like a jet plane).
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RSflared72e

I concur with badass and Matt H. A lot of folks overcompensate for these cars' reputation for timing belt catastrophes by overtightening the belts, which reduces the life of your water pump and rollers. In my experience, the balance shafts are the most common source of whine but it may be too much stress on the water pump, or both. First step is to run the engine with the balances shaft belt removed and see if its the water pump. If not, reinstall the balance shaft belt and properly retension it.

Nine_five_one

hmm.... well im taking it to the shop where I had the work done on monday.

I forgot to mentioned that before this happened I had to take it in to be tensioned beacuse it was too loose when they installed it.

Matt H

What shop are you using? i had the same problem with the dealer in San Antonio long ago.
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led

They probably over tightened them to make sure you wouldn't come back...

Matt H

OOPS! that was my guess as well. If he thinks they are too loose then we will give him tight.
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