Engine throwing out coolant..
Engine throwing out coolant..
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red_slr

Original Poster:

20,831 posts

219 months

Tuesday 11th February 2020
quotequote all
Anyone got any ideas?

Suspected head gasket. Took the head off and there are signs the gasket has been blowing, thought we were sorted. Rebuilt it and its still doing the same thing.

The head visually looked ok.

Its got wet liners so I guess it could be that but the water is crystal clear no oil. Does not smell of combustibles.

Would it be possible the pressure is building up for any other reason?

psi310398

11,103 posts

233 months

Tuesday 11th February 2020
quotequote all
Water pump failure?

Clogged radiator?

red_slr

Original Poster:

20,831 posts

219 months

Tuesday 11th February 2020
quotequote all
I was wondering about the rad myself, that's something we can probably test cheers.

Water pump looks and feels ok, so I don't think its that.

chrisch77

893 posts

105 months

Tuesday 11th February 2020
quotequote all
Failed thermostat?

red_slr

Original Poster:

20,831 posts

219 months

Tuesday 11th February 2020
quotequote all
Sniff test ok, we think we have sorted it - but will report back probably tomorrow now.

paintman

7,860 posts

220 months

Tuesday 11th February 2020
quotequote all
Other possibilities would include defective coolant system pressure cap.

stevieturbo

18,093 posts

277 months

Tuesday 11th February 2020
quotequote all
red_slr said:
Anyone got any ideas?

Suspected head gasket. Took the head off and there are signs the gasket has been blowing, thought we were sorted. Rebuilt it and its still doing the same thing.

The head visually looked ok.

Its got wet liners so I guess it could be that but the water is crystal clear no oil. Does not smell of combustibles.

Would it be possible the pressure is building up for any other reason?
Some info would help...

You say you suspected the head gasket. Why ? What were the symptoms, what tests were done to verify head gasket ?

Are whatever symptoms you have now, the same as before ? Other ?


Edited by stevieturbo on Tuesday 11th February 17:59

red_slr

Original Poster:

20,831 posts

219 months

Tuesday 11th February 2020
quotequote all
Sorry should have posted more info but was in a bit of a panic that it was the liners and was ringing round getting prices on bits... its a PACCAR engine.

It turned out to be the compressor head. It was tested ok before we did the head gasket but the test (pinch off the water lines) must not have been 100% as there must have been air still in the block or something which lead us to think HGF.

Anyway, all sorted now new compressor head and compressor gasket and its been tested all fine.

On the plus side we know the HG should be good for a good while too!!! (expensive mistake!)