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Author Topic: Belt adjustment on 2.5 Diesel  (Read 1246 times)

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GSWH

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Belt adjustment on 2.5 Diesel
« on: 28 February 2012, 20:00:41 »
Hello - I have just purchased an S reg Omega with the 2.5 litre BMW Diesel engine. Needs a few things doing and first on the list is the drive belt  - it's currently very loose so obviously needs adjusting. From my initial inspection it seems that the belt goes round the Crank Pulley, Water Pump, Power Steering Pump, Alternator and two Jockey Wheels. So far as I can tell the jockey wheels do not appear to be adjustable nor act as tensioners. My question is how is the belt adjusted?

Thanks :)
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TheBoy

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Re: Belt adjustment on 2.5 Diesel
« Reply #1 on: 28 February 2012, 20:02:27 »
The main aux belt is a sprung tensioner (looks like a small damper).

A/C belt is manually tensioned on the jockey wheel.
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GSWH

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Re: Belt adjustment on 2.5 Diesel
« Reply #2 on: 28 February 2012, 20:10:46 »
OK thanks for the info - it looked like there was only one belt for everything - I'll take a closer look tomorrow!!

Thanks again :)
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GSWH

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Re: Belt adjustment on 2.5 Diesel
« Reply #3 on: 29 February 2012, 18:33:36 »
Hi again.

Had another look today and there is only one belt serving all 4 pulleys and the 2 jockey wheels. It appears that the belt had been routed incorrectly around the two jockey wheels and also, the jockey wheel that acts as a tensioner was stuck. I have now freed this and re-routed the belt properly and all appears to be well.

Are there 2 types of diesel engines - one with 2 belts and one with a single belt - or is the difference because I accidentally misled you all by saying that the car is S reg when it is actually M reg (1994) :-[
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Omegatoy

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Re: Belt adjustment on 2.5 Diesel
« Reply #4 on: 29 February 2012, 19:59:16 »
lol early ones had 2 belts, later had a single, i reckon someone has either
A changed engine to later one, or
B changed the front end arrangement to the later setup,
either way you did the correct procedure to free off the tensioner, although did you und the large arm from the front cover n greae it all up in there? its a plain aluminium bearing and tends to seize up if you didnt, just freeing it off lasts for about a week!! :y
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GSWH

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Re: Belt adjustment on 2.5 Diesel
« Reply #5 on: 01 March 2012, 13:31:27 »
Right, got that!

Thanks again for everyone's interest and help :)
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