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Author Subject: Cambelt tension
heliosphan

Senior User

Location: UK

Registered: 14 Sep 2007

Posts: 949

Status: Offline

Post #1
I'm replacing the cambelt and can see there are differing recommendations for the correct tension on the long belt run. Currently I can twist the belt to about 45 degrees. I wouldn't be able to twist it to 75 degrees without a reasonable amount of extra thumb and finger force. It definitely won't get to 90.

Bearing all of that in mind, is my belt too tight or correct?
Posted 5th Jul 2015 at 11:50
armzsc6

Seasoned Pro

Location: Crowborough

Registered: 22 Mar 2008

Posts: 3,445

Status: Offline

Post #2
45 degrees on the longest side is perfect

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Posted 5th Jul 2015 at 12:59
heliosphan

Senior User

Location: UK

Registered: 14 Sep 2007

Posts: 949

Status: Offline

Post #3
Cheers.

I have an irregular/pulsing whirring that may or may not be down to an overtightened belt. It might be nothing and I might be oversensitive to normal pully/belt-type noises with the cambelt cover off but what do you think of this:



I've read this thread: ( http://www.306gti6.com/forum/showthread.php?id=159180 ) with varying opinions of tension and understand that a new belt will inevitably slacken slightly over time (thousands of miles I guess) so if that noise is due to belt tension, will it slowly become quieter?

Posted 5th Jul 2015 at 13:16
heliosphan

Senior User

Location: UK

Registered: 14 Sep 2007

Posts: 949

Status: Offline

Post #4
To conclude, I wasn't happy with the noise and thought it may have been a slightly over tensioned belt. I loosened and tensioned it again so that I can twist it about 60-70 degrees under firm pressure. I can twist it 45 degrees more easily, obviously. I would not be able to twist it to 90 unless I grabbed it with my fist and probably stressed the belt, which is impossible anyway due to the p**s-poor access.

With the new tension the noise went away, proving that it was slightly too tight before. I should point out that initially, when I could only get it to 45 degrees, it was at the limit of my finger and thumb pressure. Other recommendations of 45 degrees probably don't intend this level of pressure.
Posted 6th Jul 2015 at 21:18
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

Posts: 21,768

Status: Offline

Post #5
Yep, personally I would set it so that on the longest side I could twist it to 90 degrees, at the limit of my finger and thumb, that's about right.

________________________________________

"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 6th Jul 2015 at 21:59

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