Omega Owners Forum - 2.5TD Overheating breakdown :-(

platty

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Cambridge
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Drives: '02 BMW 530d Sport

2.5TD Overheating breakdown :-(
07. Nov 2010 at 19:19

Hi guys,

Car has been going really well recently (almost passed her MOT on friday) - well, until Friday night that is. Left work and drove about a mile in slow traffic but by the time I reached the slip road to join the A14 I noticed that the temp was already up to 95 (only 6-7 mins after cold startup). I accelerated gently but the temp rocketed up to 100 deg so I backed off and cosasted a few hundred yards into the BP services - the temp was now 105 and there was no power so I just left it ticking over to cool down.

Whilst waiting for the RAC I tried to run through what might be wrong, the rad tank had filled up and was really pressurised (no real surprise), the engine didnt feel "hot" when I openend the bonnet and the fans weren't running to start with. I turned it off and resarted it whereby the fans did kick in and the temperature did seem to settle down at about 98 ( about 10 degrees higher than normal) - still no hot air from fans though.

So I am guessing at waterpump for 1st check as water didn't seem to be circulating round. If not, what are the signs of HBV failure?

If anyone has any other suggestions I will gladly take them on board as it shall be getting pulled to bits next week.

Thanks! Thumbs Up!

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Seth Omega Baron Offline If there's a 'system' - play it ... ! Posts: 4236 South Wales Valleys Gender: Drives: 1999 2.5TD GLS Estate - Manual jobbie Woohoo !!!!!	Re: 2.5TD Overheating breakdown :-( Reply #1 - 07. Nov 2010 at 19:25 Whip that water pump out first Chris! If it's a gonna, I'd recommend replacing it with a Partco jobbie, as theirs have metal impellors on 'em.
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platty Senior Member Offline Posts: 900 Cambridge Gender: Drives: '02 BMW 530d Sport	Re: 2.5TD Overheating breakdown :-( Reply #2 - 07. Nov 2010 at 19:40 Seth wrote on 07. Nov 2010 at 19:25: Whip that water pump out first Chris! If it's a gonna, I'd recommend replacing it with a Partco jobbie, as theirs have metal impellors on 'em. I thought that would be the best place to look first - I'll have a look next week and let you know. Thanks
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Diamond Black Geezer Senior Member Offline Posts: 718 N E Lincolnshire Drives: Omega CDX V6	Re: 2.5TD Overheating breakdown :-( Reply #3 - 07. Nov 2010 at 19:44 Seth wrote on 07. Nov 2010 at 19:25: Whip that water pump out first Chris! If it's a gonna, I'd recommend replacing it with a Partco jobbie, as theirs have metal impellors on 'em. Oooh, careful recommending partco on here!
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Evo Junior Member Offline Posts: 68 Amersham Gender: Drives: 1996 2.5TD	Re: 2.5TD Overheating breakdown :-( Reply #4 - 07. Nov 2010 at 20:30 Bearing in mind your description of 6 minutes of driving from cold in slow traffic ...... two other causes (assuming your drive belt is ok) are: 1. Viscous fan coupling 2. Thermostat Hope it simple & easy to fix ......
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TheBoy

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TBE has an MOT!

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Brackley, Northants
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Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10

Re: 2.5TD Overheating breakdown :-(
Reply #5 - 07. Nov 2010 at 20:58

Evo wrote on 07. Nov 2010 at 20:30:

Bearing in mind your description of 6 minutes of driving from cold in slow traffic ...... two other causes (assuming your drive belt is ok) are:
1. Viscous fan coupling
2. Thermostat

Hope it simple & easy to fix ......

Viscous does do diddly squat on that engine in reality.

Stat could be jammed shut, though normal mode of failure is stuck open on those.

Waterpump shedding its impellor on these (and other BMW engines) is common, and probably the first thing worth checking Thumbs Up!

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platty

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Posts: 900
Cambridge
Gender: male

Drives: '02 BMW 530d Sport

Re: 2.5TD Overheating breakdown :-(
Reply #6 - 08. Nov 2010 at 08:40

Evo wrote on 07. Nov 2010 at 20:30:

Bearing in mind your description of 6 minutes of driving from cold in slow traffic ...... two other causes (assuming your drive belt is ok) are:
1. Viscous fan coupling
2. Thermostat

Hope it simple & easy to fix ......

Viscous fan junked 2 years ago so unless it has risen from the dead to haunt me I don't think that's it!

New stat put in about 18 months ago so woul dbe suprised if that has failed.

Will whip pump out tonight hopefully and see what is going on.

Thanks for all the suggestions so far Thumbs Up!

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smokingomega Junior Member Offline Posts: 129 Leeds Gender: Drives: 2.5td cdx chipped. NO SMOKE NO POKE	Re: 2.5TD Overheating breakdown :-( Reply #7 - 08. Nov 2010 at 11:06 I had the same problem, it did it every now an then and it ended up being the fan belt tensioner that was flicking up and jamming so the belt wasn`t being turned. The trouble I had is everytime I turned the engine off it flicked back down and re tensioned the belt so it took me ages to actually see the problem.
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Kneepad

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West Scotland
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Drives: '96 Omega 2.5 TD CDX Auto Saloon and '99 Omega V6 CD Auto Estate.

Re: 2.5TD Overheating breakdown :-(
Reply #8 - 08. Nov 2010 at 15:19

smokingomega wrote on 08. Nov 2010 at 11:06:

I had the same problem, it did it every now an then and it ended up being the fan belt tensioner that was flicking up and jamming so the belt wasn`t being turned. The trouble I had is everytime I turned the engine off it flicked back down and re tensioned the belt so it took me ages to actually see the problem.

I have also had this, but the first sign that something was amiss was the lack of power steering.

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platty Senior Member Offline Posts: 900 Cambridge Gender: Drives: '02 BMW 530d Sport	Re: 2.5TD Overheating breakdown :-( Reply #9 - 09. Nov 2010 at 21:13 Right, had the motor to bits and fished the pump out to find: So as we thought the pump was at fault. Will get a new one delivered and go from there! Thanks for all the help guys, hopefully won't be requiring your help again anytime soon (fingers crossed) Platty
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Seth Omega Baron Offline If there's a 'system' - play it ... ! Posts: 4236 South Wales Valleys Gender: Drives: 1999 2.5TD GLS Estate - Manual jobbie Woohoo !!!!!	Re: 2.5TD Overheating breakdown :-( Reply #10 - 09. Nov 2010 at 21:17 Have a fish around in the aperture Chris, just to make sure that there's no other bits of the impeller in there. Found some in one that I had in the 'shop - having it's second pump-change.
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Kneepad Omega Knight Offline Posts: 1412 West Scotland Gender: Drives: '96 Omega 2.5 TD CDX Auto Saloon and '99 Omega V6 CD Auto Estate.	Re: 2.5TD Overheating breakdown :-( Reply #11 - 09. Nov 2010 at 21:29 What a cracking picture Platty. Hopefully that can be kept on the forum under Common issues and Faqs or in Maintenance somewhere.
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platty Senior Member Offline Posts: 900 Cambridge Gender: Drives: '02 BMW 530d Sport	Re: 2.5TD Overheating breakdown :-( Reply #12 - 10. Nov 2010 at 07:43 I thought the same as you Byron as there appears to be about 15% of the impellor unaccounted for - I have had a good look around the hole though: Another picture for the library: Maybe Jimbob can stitch these into the (very good) "maintenence guide"? Thanks for the help again guys.
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Evo Junior Member Offline Posts: 68 Amersham Gender: Drives: 1996 2.5TD	Re: 2.5TD Overheating breakdown :-( Reply #13 - 10. Nov 2010 at 09:32 Interesting pictures .... but doesn't look as though the plastic impeller just got loose on the metal shaft .... more like a forieign body jammed the impeller causing it to crack apart.
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Kneepad Omega Knight Offline Posts: 1412 West Scotland Gender: Drives: '96 Omega 2.5 TD CDX Auto Saloon and '99 Omega V6 CD Auto Estate.	Re: 2.5TD Overheating breakdown :-( Reply #14 - 10. Nov 2010 at 14:09 Evo wrote on 10. Nov 2010 at 09:32: Interesting pictures .... but doesn't look as though the plastic impeller just got loose on the metal shaft .... more like a forieign body jammed the impeller causing it to crack apart. What will they get up to next.
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