Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[tunnie]

Good idea. Will try that 

[Bojan]

If the coolant is entering the cylinder, then some of the compression from the cylinder would be forced into the cooling system.
With engine running (on operating temp), take off the coolant cap -> the coolant level will rise significantly, but shouldn't 'errupt'.

[omegod]

Pop the 3 trim panels off and have a gander when it's hot, I had an invisible crack on the top of plastic tank passenger side of rad and it would evaporate instantly and the crack would close as the tank cooled, was quite a bugger to find !! Finger crossed it's summat less than HGF

[X30XE]

I'll have a tenner on it being the gaskets on the coolant bridge. Fortunately you haven't got to worry about it "hydrating" the DIS pack on the 3.2 

As you well know, HG is very very uncommon.

[Nick W]

If the coolant is entering the cylinder, then some of the compression from the cylinder would be forced into the cooling system.
With engine running (on operating temp), take off the coolant cap -> the coolant level will rise significantly, but shouldn't 'errupt'.

I used to think that, but my 3.0 rotten head gaskets leaked coolant into the cylinders(extra steam from the exhaust was the clue) but didn't affect the cooling system.

[X30XE]

If the coolant is entering the cylinder, then some of the compression from the cylinder would be forced into the cooling system.
With engine running (on operating temp), take off the coolant cap -> the coolant level will rise significantly, but shouldn't 'errupt'.

I used to think that, but my 3.0 rotten head gaskets leaked coolant into the cylinders(extra steam from the exhaust was the clue) but didn't affect the cooling system.

Must be something to do with capilary action I presume. The water migrates through the cracks but the rapid attack and decay of the cylinder compression doesn't have time to permeate backwards. 

[terry paget]

Most of the time the cylinder pressure is less than atmospheric. Hot coolant is always above atmospheric pressure. Therefore coolant migration into the cylinder is the most likely outcome of head gasket failure.

[TD]

You could get an exhaust gas sniffer....if the head gasket is gone, it should detect exhaust gases in the coolant header tank 

[tunnie]

Thanks All 

I'll have a tenner on it being the gaskets on the coolant bridge. Fortunately you haven't got to worry about it "hydrating" the DIS pack on the 3.2 

As you well know, HG is very very uncommon.

Good shout, gave it a good drive today. Stopped straight away and looked under with it running, a consistent fast drop off gearbox bell housing where it meets engine block.

[tunnie]

I would whip the plenum off tonight, but have other things on until next weekend.

[terry paget]

I'll have a tenner on it being the gaskets on the coolant bridge. Fortunately you haven't got to worry about it "hydrating" the DIS pack on the 3.2 

As you well know, HG is very very uncommon.

This thing? Sealed with a couple of dowty washers, as I recall. Certanly in the right place to drip at the back of the engine.

[TheBoy]

Need to pop the inlets out to see if coolant bridge, the helter skelter pipe, oil cooler cover or stat.  All can come from that area.

I've had 2 HG faults on the V6, but doubt this is a HG.

[Doctor Gollum]

Nope, definitely HG...

Give you £100 for it

[joff]

I would whip the plenum off tonight, but have other things on until next weekend.

Same as I had in April (oil cooler seal)

[Webby the Bear]

You've probably got a nice build up of coolant in the 'v'. I'd guess thermostat or coolant bridge. Would explain no drippage followed by drippage (as the 'v' overflows