TD5 Head Gasket?

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GTRekky

New Member
Posts
8
Hey forum,

I've got a TD5 and the coolant level indicator light came on at the weekend. I topped it up with around 1.5 litres of water and after a 30 odd mile trip, it had emptied the expansion tank again.

After starting it the following morning, I noticed a considerable amount of white smoke from the exhaust, however this only lasted for a couple of minutes whilst the engine was cold.

I used an RELD block test head gasket tester to see if my suspicions of a blown head gasket were correct, but the liquid remained blue and passed the test with flying colours.

I'm assuming the coolant is entering the combustion chamber which is why there is white smoke (steam?) on start-up, but why would it then pass a head gasket block test?

Could it be cracked head? Fuel cooler?...

Any advice is greatly appreciated.

Thanks,
GTR.
 
I expect because no burnt fuel is entering the coolant.
It depends on where the crack/break is in the head gasket. For the stuff to change colour the crack has to be between the cylinder part of the gasket and the coolant which is still circulating around. If it sucks coolant in then just blows it out via the exhaust.....
 
Hey forum,

I've got a TD5 and the coolant level indicator light came on at the weekend. I topped it up with around 1.5 litres of water and after a 30 odd mile trip, it had emptied the expansion tank again.

After starting it the following morning, I noticed a considerable amount of white smoke from the exhaust, however this only lasted for a couple of minutes whilst the engine was cold.

I used an RELD block test head gasket tester to see if my suspicions of a blown head gasket were correct, but the liquid remained blue and passed the test with flying colours.

I'm assuming the coolant is entering the combustion chamber which is why there is white smoke (steam?) on start-up, but why would it then pass a head gasket block test?

Could it be cracked head? Fuel cooler?...

Any advice is greatly appreciated.

Thanks,
GTR.
Those chemical testers rarely work on Td5's. Presumably you have an aftermarket coolant level sensor installed ?
 
Those chemical testers rarely work on Td5's. Presumably you have an aftermarket coolant level sensor installed ?
Thanks for the reply Tom,

I don't have an aftermarket coolant level sensor installed atm.

I assumed this light meant low coolant but will happily be corrected :)
 
Thanks for the reply Tom,

I don't have an aftermarket coolant level sensor installed atm.

I assumed this light meant low coolant but will happily be corrected :)

The light in that photo is the automatic gearbox temperature

The coolant level (when cold) should be at the seam of the expansion tank.
 
Tried to attach image but didnt work. Please see the following link for an example:
Looks like it was a transmission fluid warning 🤦‍♂️🤦‍♂️ Should have done my research before looking like a plonker 😂

Really appreciate your help :)

I'll top up the coolant again to that seam and monitor how much it drains over the next couple of days :)
 
Do you not have access to a compression tester for diesels?
I just pressure tested the cooling system and that held pressure for 20 mins with no leaks.

I do have a compression tester, how would I go about this test on the TD5? Is it as simple as pulling the glow plugs, disconnecting injector loom, then cranking with the compression tester on each cylinder??
 
I just pressure tested the cooling system and that held pressure for 20 mins with no leaks.

I do have a compression tester, how would I go about this test on the TD5? Is it as simple as pulling the glow plugs, disconnecting injector loom, then cranking with the compression tester on each cylinder??
Are you still losing coolant ?
 
In my opinion, it's quite likely that your block is not completely flat and coolant is leaking out under the head gasket into the cylinders.

Im rebuilding one now with exactly this problem and using similar amounts of coolant.
 
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