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Author Topic: Overheating 2.5TD (BMW Engine)  (Read 3520 times)

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Spearmint

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Overheating 2.5TD (BMW Engine)
« on: 02 February 2009, 09:28:10 »
Hey guys,

I noticed on my way to work this morning that my temp gauge was a lot higher than normal so I monitored it for a mile or so in which time it steadily increased so I threw caution to the wind by shutting her down and waiting for assistance.

A number of scenarios where running through my head whilst I was sat there with my hazards on wincing as numerous other commuters obviously wheren't looking all that far ahead and thus taking evasive action to avoid rear ending my car.

That's drivers in Corby for you, useless gits.

So I've just had a look under the bonnet and noticed that the coolant reservoir is as it should be and I didn't notice anything like white plumes of smoke behind me so I can rule out the HG.

What are the water pumps like on these? Can they fail and not give the classic leak from the bottom of the pump?

My money is on either the Thermostat or maybe a blocked Rad?

Edit - Oh I also couldn't get any heat from the vents so that could be heater matrix. right?

What do you guys think?
« Last Edit: 02 February 2009, 09:29:11 by Spearmint »
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TheBoy

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Re: Overheating 2.5TD (BMW Engine)
« Reply #1 on: 02 February 2009, 09:32:05 »
The waterpumps are utter crap. rather useless. The idiot at BMW who designed it should be shot dead.

Did the temp go over 100C on the gauge?  100C on the gauge is about 110C in reality, which is the safe point of the engine - beyond this, and you run a significant risk of the age old BMW problem of cracked heads.

Start by popping the pump out, see if its lost its vanes.  Easy job, but the pumps ain't cheap (£60 for pattern, £100 for OEM)
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philglasgow

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Re: Overheating 2.5TD (BMW Engine)
« Reply #2 on: 02 February 2009, 09:33:27 »
hi mate   ive got same problem , but no heat would be due to fact its probably nearly empty so no water to heat  maybe , is your mpg the same?
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TheBoy

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Re: Overheating 2.5TD (BMW Engine)
« Reply #3 on: 02 February 2009, 09:35:24 »
Quote
hi mate   ive got same problem , but no heat would be due to fact its probably nearly empty so no water to heat  maybe , is your mpg the same?
Lack of heat will be because the pump spindle is spinning, but the vanes are scattered around the block, thus coolant doesn't flow.
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Spearmint

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Re: Overheating 2.5TD (BMW Engine)
« Reply #4 on: 02 February 2009, 09:38:45 »
Phil, reservoir is full so I can rule out lack of coolant.

Which is the easier fix? Water pump or Thermostat?

Any how to threads?
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Spearmint

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Re: Overheating 2.5TD (BMW Engine)
« Reply #5 on: 02 February 2009, 09:42:55 »
Oh and I didn't let the temp go above 100'c. So hopefully I have caught it in time.
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TheBoy

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Re: Overheating 2.5TD (BMW Engine)
« Reply #6 on: 02 February 2009, 09:44:40 »
Quote
Phil, reservoir is full so I can rule out lack of coolant.

Which is the easier fix? Water pump or Thermostat?

Any how to threads?
Both as easy as each other, and assuming you have already done the decent thing a thrown that pointless, stupid viscous fan in the garage (god only knows why the retarded stupid designer smoked that big spliff before drawing on a viscous fan), only take 15mins :)

It WILL be the waterpump (if it was stat, you would have had a shit load of hot air from vents ;))
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Spearmint

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Re: Overheating 2.5TD (BMW Engine)
« Reply #7 on: 02 February 2009, 09:47:14 »
Good point on the Thermostat, cheers.

So waterpump, where abouts, what, why, when, how, who?
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TheBoy

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Re: Overheating 2.5TD (BMW Engine)
« Reply #8 on: 02 February 2009, 09:49:13 »
As to guide, feel free to write one when you do it, with pics  :P


Remove 'Turbo Diesel' plastics

Remove that stupid viscous fan (left hand thread), and plastic rad cowling

Remove aux belt (find spring/damper, see it attaches to black metal plate via bolt - undo OTHER bolt that secures black metal plate, and then loosen bolt through damper). Do NOT use a pry bar on tensioner.

Remove waterpump pulley, then remove pump.

If you what to play with stat, thats easily accessible now - remove bottom hose, then 3 bolts to remove stat.
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Spearmint

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Re: Overheating 2.5TD (BMW Engine)
« Reply #9 on: 02 February 2009, 09:52:25 »
Ah right so looking into the engine bay it's on the left hand side? I'm sure I'll work it out once I have the covers off.

Pics on a separate thread to follow.  ;)
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TheBoy

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Re: Overheating 2.5TD (BMW Engine)
« Reply #10 on: 02 February 2009, 09:59:08 »
Quote
Ah right so looking into the engine bay it's on the left hand side? I'm sure I'll work it out once I have the covers off.

Pics on a separate thread to follow.  ;)
Nope, waterpump is the pulley that that stupid, pointless, gay viscous fan bolts to :)

(In case you didn't realise, I'm not a huge fan of viscous fans)
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Spearmint

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Re: Overheating 2.5TD (BMW Engine)
« Reply #11 on: 02 February 2009, 10:00:02 »
Just rang CAS in Corby.

No pumps on the shelf but they can order me one in.

Apparently it's a Mirrortech item or something, 30GBP all in. Anygood?
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TheBoy

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Re: Overheating 2.5TD (BMW Engine)
« Reply #12 on: 02 February 2009, 10:02:32 »
Quote
Just rang CAS in Corby.

No pumps on the shelf but they can order me one in.

Apparently it's a Mirrortech item or something, 30GBP all in. Anygood?
No idea, but guess its better than the one you have.  I put a make I'd heard of in mine, think it was QH (was a couple of years ago though).

Worth popping old one out first to confirm? 30mins tops if that stupid bloody fan comes off easy.
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Seth

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Re: Overheating 2.5TD (BMW Engine)
« Reply #13 on: 02 February 2009, 10:37:18 »
I changed my water pump - got a QH one for 38 quid.

Straightforward enough job, but make a note of the routeing of the belt before you start. When you remove the pump, have a good look in the recess behind, (where the impeller sits). I found bits of the impeller vanes sitting in there.

I also changed the 'stat at the same time.
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osealy

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Re: Overheating 2.5TD (BMW Engine)
« Reply #14 on: 02 February 2009, 10:46:04 »
Why not use pry bar, I'm afraid I did.
Quote
As to guide, feel free to write one when you do it, with pics  :P


Remove 'Turbo Diesel' plastics

Remove that stupid viscous fan (left hand thread), and plastic rad cowling

Remove aux belt (find spring/damper, see it attaches to black metal plate via bolt - undo OTHER bolt that secures black metal plate, and then loosen bolt through damper). Do NOT use a pry bar on tensioner.

Remove waterpump pulley, then remove pump.

If you what to play with stat, thats easily accessible now - remove bottom hose, then 3 bolts to remove stat.
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