Squeals when starting from cold - new belt and tensioner.

[jazzdude]

My car has ac so fitted a dayco 7pk2092 and a new tensioner, as supplied by tvr parts and for the first 10 seconds of starting, it shrieks when I blip the throttle.

Say 10 mins later I put the ac on, the same again for about 10 seconds until it 'warms up'.

Just ordered a Gates 2090, if this turns out the same then what's up here?

[jazzdude]

The old belt was pre ac so wrong length now.

As far as I know there is only one way to route the belt around the wheels, isn't there?

[jazzdude]

Tvr parts supplied me with a 2092 and said that was the correct size when I told them about the squeal.

[jazzdude]

ukdj said:

is it a factory a/c system or aftermarket retro fit?

I recently replaced the belt on an a/c equipped car with the factory setup using a 7PK2080 without issue

It is a factory compressor so all wheels should be standard.

A belt that is 10mm shorter as you say makes sense but does anyone have a tvr source that confirms that these shorter belts are the correct size.

[jazzdude]

N7GTX said:

Both Powers and TVR Parts say the part number is P0139 for late models with aircon. Unfortunately they don't give the length and both are closed now.

https://tvr-parts.com/tvr-parts/part-details/tvr-p...

http://www.powersperformance.co.uk/store/slug/serp...

That one is 2092, the one I bought

[jazzdude]

N7GTX said:

And the tensioner is P0136? (not E2213). Hmmmm.......

Should look like this: http://www.powersperformance.co.uk/store/slug/belt...

Edited by N7GTX on Saturday 8th July 15:42

I bought that too

[jazzdude]

Fitted a Gates 2090 yesterday and although the shriek at start up is still there, it goes away more or less a couple of seconds later.

Can the tensioner be adjusted to move further away to increase the tension on the belt?

As I said this started when I fitted an ac compressor and had to change the belt and tensioner. This is also with me starting the car from cold with the ac off.

[jazzdude]

QBee said:

Have you tried getting someone else to start the car with your head under the bonnet?

With an ear near the compressor pulley?

[jazzdude]

Steve_D said:

If memory serves me the tensioner can be fitted with its lug in one of three holes.

Steve

That's a point, I'll check to see if it moves further round.

[jazzdude]

Took the tensioner off this morning, it is in the right hole as the other two are smaller and the pin, so will try using chalk.

[jazzdude]

The squealing was getting worse starting from cold with the ac on, so a guy servicing the ac decided to change the belt for a 2075, that's 15mm shorter than the size that TVR parts sent me (2092).

Well, the squealing has stopped completely, even if I start it from cold with the ac on, so that seems to have solved that issue.

Thing is, he has put a 6 grooved belt on (couldn't find a 7 grooved one here).

It seems OK, as I said, but is it necessary to order a 7 groove belt online, or will this be fine as it is?