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[Kate]

Hi all.

Sorry to be a nuisance with all my questions. I know I'm a pest.

I'm going to have a go at changing the thermostat and water pump on my overheating diesel. I've read the guide for the water pump but I can't find a guide for the thermostat. Is there a Haynes manual that would cover this job? I've looked at lots of manuals for sale online but none seem to cover the 2.5 diesel engine.

Thanks for all the help!

[zirk]

Not for the Omega, if you need a Manual best bet is for an older BMW 325, 525 etc with the same lump 2.5TD.

Not sure if this will help you -

http://images.omegaowners.com/documents/25TD/M51D25_Engine.pdf

[tunnie]

I thought a mobile mechanic diagnosed a HG failure? 

[Kate]

I thought a mobile mechanic diagnosed a HG failure? 

He did but I wanted to be certain, one way or the other.

[Kate]

Not for the Omega, if you need a Manual best bet is for an older BMW 325, 525 etc with the same lump 2.5TD.

Not sure if this will help you -

http://images.omegaowners.com/documents/25TD/M51D25_Engine.pdf

Thanks very much, that's very helpful.

[tunnie]

I thought a mobile mechanic diagnosed a HG failure? 

He did but I wanted to be certain, one way or the other.

A compression test would be a better approach. 

[Mr.OmegaMan]

Spotted this genuine Vauxhall 2.5TD water pump going pretty cheap.

https://www.ebay.co.uk/ulk/itm/152023490089

[Nick W]

Spotted this genuine Vauxhall 2.5TD water pump going pretty cheap.

https://www.ebay.co.uk/ulk/itm/152023490089

Did you notice the plastic impeller? Metal ones are less problematic

[Mr.OmegaMan]

Spotted this genuine Vauxhall 2.5TD water pump going pretty cheap.

https://www.ebay.co.uk/ulk/itm/152023490089

Did you notice the plastic impeller? Metal ones are less problematic

I did but though't I'd share either way. I am aware metal impellers are the preferred choice given the option. Anyway...

[Kate]

Thanks but I ordered one yesterday.

http://www.ebay.co.uk/itm/291291304987?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT

[TheBoy]

Stat dead easy when doing pump - basically disconnect hose, unbolt housing, replace stat.

Hardest bit of whole pump/stat job is removing the viscous fan, which can be a bugger.

[Nick W]

Stat dead easy when doing pump - basically disconnect hose, unbolt housing, replace stat.

Hardest bit of whole pump/stat job is removing the viscous fan, which can be a bugger.

You loosen it as soon as you have room to get a fan spanner on it, by giving that a bash with a proper hammer. As long as you've checked which hand the thread is , it isn't a difficult job.

[TheBoy]

Stat dead easy when doing pump - basically disconnect hose, unbolt housing, replace stat.

Hardest bit of whole pump/stat job is removing the viscous fan, which can be a bugger.

You loosen it as soon as you have room to get a fan spanner on it, by giving that a bash with a proper hammer. As long as you've checked which hand the thread is , it isn't a difficult job.

Oh, believe me, if only ze germans had made it that easy. idiotting it rarely works, which I guess is why BMW/LR/GM specify a pulley lock to counterhold before said idiotting.

Like many (stupid, poxy) viscous fans, its LH thread on the TD lump, for reference.

[Kate]

The fan is missing so I didn't need to remove it.

[Bigron]

I had to remove the vicious (deliberate typo!) fan many times due to overheating problems, so when you get a fan to put on, Kate, it WILL be a left-hand thread, because it helps it to tighten as the engine rotates - otherwise it could spin off in service.
Should you need to remove it at a later date, a tip from a garage man in Cornwall - take a beefy screwdriver with a pound-through handle, hold the blade firmly against a corner of the fan's retaining nut at its RH edge, and give the handle end of the screwdriver a firm and sharp tap with a grown-up hammer!

Ron.