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[25td-jazman]

Ok Read this and tell me I'm wrong !!! The engine is the "bullet proof" 2-5td BMW unit that has performed perfectly even though most of the miles I have covered thus far have been side ways or over the legal limit I think, but wouldn't recommend to law following citizens, so in short the dog does hunt !!
  After a recent qwik trip to Sunny Aberdeen the COOLENT LEVEL warning was displayed on the way home, (nothing new there eh ?) around 10 mins later the temp shot up and I nursed the car to the garage refilled the header bottle which took very little water ? and made my way home.
Checking the car over the next day I found that the oil and water were in the places they should be but still after running for an hour or so the car began to over heat again !
I cut the centre out of the thermostat which made no difference even though it wasn't opening fully when it was tested !
The fan is viscous and turns as it should !
Suggestions so far have included air locks, a cracked head that is letting exhaust gases into the water system and a knackered engine.
Admittedly when you pull the overflow pipe from the header tank and hold the revs steady - water will fire out the bottle ? It does suggest that the pump is doing something but I fear not enough ?
Any suggestions and how to fix are welcome along with possible suppliers of said parts !

[old cruiser]

Check seal on the coolant tank cap, may not be sealing properly and causing water to boil as it were.
Cheers Pete

[Richard A]

Pleaase check 'heater by-pass value', yes even the BWM diesel has them.  
regards

[TheBoy]

The engine is the "bullet proof" 2-5td BMW unit

LOL. "Bullet Proof" and "BMW" are not 2 phrases I would use in same sentence....

Right, trying to be more constructive, here are some things to try (yes, I have one of these crap engines as well):

Check waterpump - they have a habit of shedding plastic impellor fins.
Replace stat rather than drill it - helps to stabilise temp on these.
Check for coolant hose delamination.
Check for hot/cold spots on rad - these engines (and many other BMW plants) seem to sludge up rads after a while, causing poor efficiency.
Check electric cooling fans working.
Do a thorough coolant flush, use Forte cooling system flush.
Check if excess pessure build up in coolant, if it is, check for coolant leaks, but be aware these engines are prone to cracking heads (my current problem).

Hope that helps

[TheBoy]

Pleaase check 'heater by-pass value', yes even the BWM diesel has them.  
regards

Generally reliable from what I can tell...

[TheBoy]

Also, check the expansion bottle, sometimes they fail where the threaded bit is 'welded' into main bottle.

[25td-jazman]

Thankx for the pointers gents !!
As a trip to the local halfords for a workshop manual has proved fruitless I will need a little more help identifing the heater bypass valve and where it can be found lurking.
Is the valve easy to remove and test

Now that I think about it ! The heater in the car never was the warmest ! Could this have been an indication of something that I missed !!

Got ma mind on my miggy and my miggy on my mind !!   :-/

[Grumpy]

As a trip to the local halfords for a workshop manual has proved fruitless

Amazon have them at £13-29 new and £9-99 used.

[Richard A]

HBV is back of engine bay just below wiper motor, remove wipers and scuttle, they can weep then just go, bit of a pig but if you are leaking water but you can't spot from where its the HBV, about £40 from GM.
very very common problem have a look.
regards  

[Darth Loo-knee]

Have a look at this link, there is a picture of an engine with arrows on it.. C is the HBV

http://www.omegaowners.com/forum/YaBB.pl?num=1152598350

[TheBoy]

hold on, he has td, not v6.

Haven't picture as I've striped mine down awaiting new engine.

hbv - about halfway along engine, near top, drivers side, as a round plastic unit with 2 miedium size coolant pipes, one goes to baukhead, other goes through 180 degrees then around back of engine? the hbv is plastic bit, with a vac connection on top.  Easy to see if leaking, doubt it.

Haynes dont do manuals for omega td.


Do a search and have a look at posts for 'TB2' or 'project tractor'

[TheBoy]

if water 'flies out' of bottle with cap off, that will likely be due to exhaust gases. Remove waterpump though to be sure that still has impellors attached.  It if hit 100C on gauge (110C in reality), I suspect head cracked....

[Darth Loo-knee]

hold on, he has td, not v6.

Haven't picture as I've striped mine down awaiting new engine.

hbv - about halfway along engine, near top, drivers side, as a round plastic unit with 2 miedium size coolant pipes, one goes to baukhead, other goes through 180 degrees then around back of engine? the hbv is plastic bit, with a vac connection on top.  Easy to see if leaking, doubt it.

Haynes dont do manuals for omega td.


Do a search and have a look at posts for 'TB2' or 'project tractor'

The idea of me putting the picture on was to show the guy what a HBV looked like!
Or are they not the same?

As a trip to the local halfords for a workshop manual has proved fruitless I will need a little more help identifing the heater bypass valve and where it can be found lurking

[TheBoy]

hold on, he has td, not v6.

Haven't picture as I've striped mine down awaiting new engine.

hbv - about halfway along engine, near top, drivers side, as a round plastic unit with 2 miedium size coolant pipes, one goes to baukhead, other goes through 180 degrees then around back of engine? the hbv is plastic bit, with a vac connection on top.  Easy to see if leaking, doubt it.

Haynes dont do manuals for omega td.


Do a search and have a look at posts for 'TB2' or 'project tractor'

The idea of me putting the picture on was to show the guy what a HBV looked like!
Or are they not the same?

As a trip to the local halfords for a workshop manual has proved fruitless I will need a little more help identifing the heater bypass valve and where it can be found lurking

Only 2 port on tractor, not 3 port like v6.  Otherwise similar looking...

[TheBoy]

Off car piccy of TD HBV...