Expansion Tank one way valve...

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Disco-94

New Member
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41
Hi folks,

Ordering a new 300tdi head from Island 4x4, with Erling gasket and am changing water pump and thermostat for good measure.

Is it possible to clean out the one way valve that comes off the expansion tank or is it best to replace? If replacing, where can I get one / identify it? Island 4x4 doesn't seem to list and nothing on eBay.

Any other sugestions for sensible things to replace at this stage, I've posted before about problems with the head so won't repeat myself. She's an M reg 300tdi with 117K on the clock.

Cheers, Russ ;)
 
Thanks for that, although I wasn't talking about the pressure cap, but the in line plastic valve on the pipes below the expansion tank. Not sure what it's called, or a part number.

Also, I think the new water pump come with a gasket, unless the P gasket is a seperate thing? ;)
 
Thanks for that discool, although can't find an online supplier so my local 4x4 specialist is ordering one in. They say 'in the region of £20' which sounds expensive, but it would be false economy to spend the other £325 without this I think.

Looking forward to having her back on the road, so I know what I'm doing this weeknd ;)
 
I just bought that valve complete with the 3 hoses from my local main stealer it was £20.01 + VAT

Part No: LPCH117840
 
Excellent, hopefully that's what I'll be picking up on Friday then, and Island 4x4 have already dispatched the other bits so I look all set for the weekend. The Met Office is forecasting 8deg on Saturday, so all systems go ;)
 
discool said:
It must look like this then:

http://www.lrseries.com/shop/product/listing/9555/all/1430/PCH117840-EXPANSION-TANK-BLEED-HOSE.html

That looks like Eynsford ford your having a splash in your avatar, Horsey:)
Click to expand...


Hi Discool yes well spotted that is Eynsford ford I had a play in.

That is indeed the correct part above, all i wanted was one of the hoses that connects to the thermostat housing as my aircon belt had worn half way through it, I have took the belt off now and when its refitted I will place a bit of copper pipe over the hose to protect it from happening again.
 
Yes the three way valve can be cleaned out! I've been there on a very bad dog of a Discovery 300TDi (the white one) that gave me a LOT of trouble. Fortunately I had already bought hundreds of pounds-worth of spares for an even worse dog of a Discovery (the red one) that went belly-up after three days. (No fins left in its radiator and severe overheating on the Blackdown Hills on the A35 followed by more overheating on the A30) The sellers were out and out cheats as in the end it turned out that the father had bought the car for his 17 year old son and lent it to him for eight years! As the son's hobby was off-roading you can imagine what the car was like. Of course the legal owner was the middle aged father who purported that the car was his and had been fully serviced by a garage.

Now regarding that valve or three way union. Get a long thin wood-screw and keep screwing and pulling until all the hardened sludge comes out. On my white Disco the pipe stubs were completely choked with either rust or radiator sealer. If the non-return valve diaphragm gets damaged it doesn't matter as the late types are just are three way union. Finally connect the pipes and union to a water tap and make sure that water flows freely through ALL the pipes.

The white Disco had also overheated and blown its head gasket just like the red one but if I had known about the blocked union it would have run for a lot longer. In actual fact somebody (not me) had messed-up the valve timing and all the pistons had valve dents in their crowns. My repairs included new standard pistons in cylinders which had been ridge-reamed and honed by myself. A new South African cylinder head was fitted and a new aluminium radiator that had a 10% upgrade over standard. A new timing belt kit was fitted and it was TIMED CORRECTLY by yours truly. After all this work there was no more overheating and towing 3.5 tons was no trouble at all even in hilly districts. Some pundits claim that fitting new pistons in old bores is bad practice but after my repairs the white Disco hauled a 4 wheel boat trailer and its load from Peterhead to Cornwall. No water or oil were used apart from diesel oil and this is proof that a Disco can be reliable. Good luck!
 
Yes the three way valve can be cleaned out! I've been there on a very bad dog of a Discovery 300TDi (the white one) that gave me a LOT of trouble. Fortunately I had already bought hundreds of pounds-worth of spares for an even worse dog of a Discovery (the red one) that went belly-up after three days. (No fins left in its radiator and severe overheating on the Blackdown Hills on the A35 followed by more overheating on the A30) The sellers were out and out cheats as in the end it turned out that the father had bought the car for his 17 year old son and lent it to him for eight years! As the son's hobby was off-roading you can imagine what the car was like. Of course the legal owner was the middle aged father who purported that the car was his and had been fully serviced by a garage.

Now regarding that valve or three way union. Get a long thin wood-screw and keep screwing and pulling until all the hardened sludge comes out. On my white Disco the pipe stubs were completely choked with either rust or radiator sealer. If the non-return valve diaphragm gets damaged it doesn't matter as the late types are just are three way union. Finally connect the pipes and union to a water tap and make sure that water flows freely through ALL the pipes.

The white Disco had also overheated and blown its head gasket just like the red one but if I had known about the blocked union it would have run for a lot longer. In actual fact somebody (not me) had messed-up the valve timing and all the pistons had valve dents in their crowns. My repairs included new standard pistons in cylinders which had been ridge-reamed and honed by myself. A new South African cylinder head was fitted and a new aluminium radiator that had a 10% upgrade over standard. A new timing belt kit was fitted and it was TIMED CORRECTLY by yours truly. After all this work there was no more overheating and towing 3.5 tons was no trouble at all even in hilly districts. Some pundits claim that fitting new pistons in old bores is bad practice but after my repairs the white Disco hauled a 4 wheel boat trailer and its load from Peterhead to Cornwall. No water or oil were used apart from diesel oil and this is proof that a Disco can be reliable. Good luck!

PS A GOOD Disco is able to tow in 5th gear but a bad one like the red one will not accept 5th owing to excessive lash in the transmission (it will snatch and jerk if 5th gear is engaged when towing) Of course the problem when buying a car is that one seldom has a 3.5 tonne trailer and a range of steep hills available. These are IMHO essential when trying to differentiate between a Disco that can really pull and one that is only any good for the school run. In my case my twin-cam hatchback had snapped its cam-belt over 200 miles from home and it was then found that my recovery package had slyly been watered down to a tow of twenty miles maximum. I did have a policy booklet extolling the full recovery and/or hotel package that was included with my car insurance but this must have just been a first year introductory offer. As the RAC wanted about £500 to recover the twin cam, the red Disco was purchased but it turned out to be a dud. In the end I had to repair my Rover 800 Di (the beaten-up one that was hit by an uninsured artic) and recover the twin-cam using that. In my long experience no-one ever sells a good 4x4 and all the affordable ones are basically like a Meccano Set (you have to build them yourself) Good luck!
 
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