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[trevlac]

Hi.
Symptoms were, 'Check Coolant' Warning on dash, then steam from the back of the engine.

After reading similar posts, I had hoped that my coolant leak would be from the HBV.

My question is: is it obvious when the HBV is leaking.

I stripped the wipers and scuttle off this morning to have a closer look.
When the engine warmed up I could just see water drops running down the narrow gap between the engine and Eventually steam started to be blown out but I couldn't see where from. From the passenger side my glasses kept steaming up and I couldn't see enough from the drivers side. Getting my hand in, I now realise that I can move the HBV around so I'm going to top up the water and have another go but it's starting to get dark now so I probably won't be able to see much.
So is it obvious, and can you see it, when the HBV is leaking? and are there other bit, you can't see, that leak back there and eventually produce steam?
Thanks in advance.
Regards, t...

[hotel21]

It can sometimes make a difference depending on what position the cabin heater is at.   Sometimes only leaks when on, sometimes only when off.  Try both and see if any difference.

Good chance its the bypass valve in any event....  Not too dear (twenty quid or so?) but better to replace than have it let go when you are in the middle of nowhere....

[hotel21]

Just to add, make sure all the hoses are tightly connected and not cracked/cut....  

[Darth Loo-knee]

Had some steam coming out from under the bonnet the other weekend, could see water dripping onto the transfer pipe that is o the drivers side going from the radiator to the back of the engine.
Turned out to be the seal between the transfer pipe and engine.

Hope its the HBV mate as it is far easier to change

[trevlac]

Thanks. I think I will replace the bypass valve anyway and see what happens then.
It's very difficult to see all the hoses and connections down that narrow gap. It must be a nightmare to replace them.

Regards, t...

[Darth Loo-knee]

Thanks. I think I will replace the bypass valve anyway and see what happens then.
It's very difficult to see all the hoses and connections down that narrow gap. It must be a nightmare to replace them.

Regards, t...

If you take your wipers off, then the scuttle panel off (it has a small torx bolt on the drivers side and 5 plastic clips under the windscreen rubber) you will be suprised how much more room you have to get at the HBV

[hotel21]

http://www.omegaowners.com/forum/YaBB.pl?num=1193594464  

[Marks DTM Calib]

Disected a failed bypass valve today.

It would appear tht there is two sets of rubber bellows (small and large) inside. The small set is the basic water seal and the large set forms the vac diagphram.

On this one, the small one had failed and the water was dripping (not to fast) .....change the heater setting and it came out as a torrent!

[bighed]

Had some steam coming out from under the bonnet the other weekend, could see water dripping onto the transfer pipe that is o the drivers side going from the radiator to the back of the engine.
Turned out to be the seal between the transfer pipe and engine.

Hope its the HBV mate as it is far easier to change

That wouldnt happen to be my donkey your on about?  

[Andy B]

Disected a failed bypass valve today.

It would appear tht there is two sets of rubber bellows (small and large) inside. The small set is the basic water seal and the large set forms the vac diagphram.

On this one, the small one had failed and the water was dripping (not to fast) .....change the heater setting and it came out as a torrent!

That's the one around the centre spindle?
That's how mine had failed when I was in Kent last year.

[Darth Loo-knee]

Had some steam coming out from under the bonnet the other weekend, could see water dripping onto the transfer pipe that is o the drivers side going from the radiator to the back of the engine.
Turned out to be the seal between the transfer pipe and engine.

Hope its the HBV mate as it is far easier to change

That wouldnt happen to be my donkey your on about?  

NO!!  

[bighed]

HA HA. u hate my mig dont u  

[Marks DTM Calib]

Disected a failed bypass valve today.

It would appear tht there is two sets of rubber bellows (small and large) inside. The small set is the basic water seal and the large set forms the vac diagphram.

On this one, the small one had failed and the water was dripping (not to fast) .....change the heater setting and it came out as a torrent!

That's the one around the centre spindle?
That's how mine had failed when I was in Kent last year.

Yep!

[trademeister]

Hi ,
 My hbp had gone and looking under the car the water was running down the bellhousing. Should be easy enough to diagnose when feeling around under the hbp there will be noticable wetness. Good luck tho in fixing. Mine was a swine to do!!! lol

[TheBoy]

Disected a failed bypass valve today.

It would appear tht there is two sets of rubber bellows (small and large) inside. The small set is the basic water seal and the large set forms the vac diagphram.

On this one, the small one had failed and the water was dripping (not to fast) .....change the heater setting and it came out as a torrent!

That's the one around the centre spindle?
That's how mine had failed when I was in Kent last year.

Yes. Same happened on tractor last summer. Did post up some pics at the time