timing belt and water pump replacement
 

Hello everyone

I have a 2.0 CDTI ROVER 75

today I noticed that when I turn the A/C on in cool mode there is a noise as a "belt screech" that last for about 2 seconds and then disappear.

1) Have I to replace the belt?

2) Is convenient to mount a kit a complete auxiliary belt kit with tension pulley, ecc

3) if yes this kit should be good? https://m.autodoc.co.uk/gates/7593909

4) the water pump is connected to timing belt? if yes, is convenient to change it too?

4) what is the labor cost of mechanic?

Your low speed fan is not working, the noise you hear is the compressor overcharging, turn off your AC until you get the fan repaired or you can damage the compressor

Ciao :)

why does it last only for 1-2 seconds?

If the noise comes on straight away when you turn the aircon on then check the belt tension, and if it happens after some time then as Andy says check your engine cooling fan is working.


I assume you have a petrol engined model? :shrug:

first of all thanks to all of you:}


I have 2.0 cdti

it happens 3 seconds after I press on A/C button

In case you need it, here's the aircon drive belt - https://www.dmgrs.co.uk/products/rov...belt-pqs000180

Click the dropdown arrow and there's an option to buy the auxiliary drive belt as well.

if the labor cost is the same, could be a good idea to change everything using the kit?

https://m.autodoc.co.uk/gates/7593909

I would test the fan before doing anything else. See post 3 here - https://www.the75andztclub.co.uk/for...d.php?t=257588

Let us know what happens.

could you explain me what is ignition 2 position?

Position #2 is the run position.

See below

https://www.the75andztclub.co.uk/for...d106e0d732.jpg

:}

Above is Owners Handbook page 95 (UK version). It might be on a different page in the Italy version.

Owners Handbook pdf here - http://storm.oldcarmanualproject.com...nersmanual.pdf

I can't find one in Italian, even though the front cover of the UK version says 'Manuale di Instruzione'.

ok

the fans of the radiator work well when, in 2-position, I press this https://guidaevai.com/assets/fronten...parabrezza.png


I'll post a video as soon as possible

Ah in that case you don't have a timing belt - the diesel cams are driven by two timing chains.


The alternator, water pump and power steering are driven from the longer auxiliary belt, and the short belt behind it drives the air con compressor directly from the crankshaft pulley.


The longer belt has an automatic tensioner, but the one for the air con compressor is manually tensioned, so worth checking it is set correctly.


You will have to remove the long belt to replace the shorter one.

If the fan is OK the aircon belt has to be the next suspect. Can Paolo inspect it by taking one cover off - or is it more complicated than that? (I'm not familiar with the diesel).

Yes easy to get to it from underneath once the undertray is removed.

what could be approximately the labor cost to change tension pulley and belt of the air compressor?

Sorry I can't help you with costs as I do my own work, but a good mechanic who knows what he is doing should be able to change the belt and tensioner in around half an hour.

Worth changing the longer belt as well if you don't have a record of it being done.

I changed the belt and the pulley

overall cost 90 €

I solved my problem

thanks to everyone

Important note about compressors
 

Andy,

Don't forget that in the event of refrigerant pressure rising to an excessive level due to lack of fan assistance, the trinary switch will disengage the compressor clutch which prevents damage. :}

Simon

Has anyone come up with an answer as to the origin of the noise?


All I can think of is it being either a pressure relief valve, or the compressor being driven in reverse by the pressurised refrigerant once the trinary switch disengages the clutch.


The compressor is a Williams Janney style constantly variable positive displacement pump, so if there was enough pressure on the pistons they could be driven back if the swash plate was still at an angle to the block.