bit the bullet.

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bit the bullet.

Post by simmo116 on Mon Dec 09, 2013 2:04 pm

Well after tinkering the weekend on the mystery machine I couldn't stop it purging coolant into expansion bottle and out onto road. Took it to garage to test head gasket. Just waiting for the result. :-[

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Re: bit the bullet.

Post by HighlyJetted on Mon Dec 09, 2013 3:57 pm

Chemical head gasket test kits don't work very well on a hijet as there isn't a place where the gases accumulate.

If you get a positive, it has definately gone.
If you get a negative, it still most likely has gone.

Makes sense  Laughing Laughing 
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Re: bit the bullet.

Post by simmo116 on Tue Dec 10, 2013 7:52 am

Passed the chemical test. There going to check all hoses now for blockage.

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Re: bit the bullet.

Post by HighlyJetted on Tue Dec 10, 2013 9:36 am

My red van passed the chemical test about 3 times but the head gasket had gone  Wink

Reason is, you can't get a good gas sample of this type of system.
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Re: bit the bullet.

Post by simmo116 on Tue Dec 10, 2013 10:06 am

That's what I'm worried about is there another way to rule it out without stripping down. Haven't really got funds this side of Xmas. To sort plus at moment it gets me to work and back ok only ten minute drive.

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Re: bit the bullet.

Post by simmo116 on Tue Dec 10, 2013 10:14 am

A compression test maybe? Funny enough it didn't purge into the expansion tank while in the garage last night.

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Re: bit the bullet.

Post by HighlyJetted on Tue Dec 10, 2013 10:28 am

They don't tend to purge at all if you just leave them idling.

They only purge when under proper load, e.g. acclerating - due to the cylinder pressures.

I doubt you would see any variation in compression.
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Re: bit the bullet.

Post by Logi on Tue Dec 10, 2013 4:17 pm

Prob not the case but they do it if its lost water, my old one did it on the way up from York, though only the once.
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Re: bit the bullet.

Post by simmo116 on Wed Dec 11, 2013 6:34 pm

turns out the matrix is blocked so bypassed it and no purging. great just as winter sets in. at least I got two weeks off over crimbo to sort it. is there a guide on here somewhere to getting at it?

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Re: bit the bullet.

Post by HighlyJetted on Wed Dec 11, 2013 6:47 pm

Why do  you think your heater matrix is blocked?



If you don't bleed them properly you will never in a million years get the air out of the heater matrix, as it's the highest point in the system.

If you leave them with a matrix full of air, then they will boil up and purge early, because the air is compressible, unlike if it was 100% full of water which is a far less compressible fluid.

You can test to see if the matrix flows ok, by using the pressure fill method  Wink

Likewise you can 100% bleed it of air using the pressure fill method.
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Re: bit the bullet.

Post by simmo116 on Wed Dec 11, 2013 6:57 pm

[quote="HighlyJetted"]Why do  you think your heater matrix is blocked?

because the man in oily overalls told me......lol
will connect back up while off and try the pressure fill method.
cheers hj.

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Re: bit the bullet.

Post by simmo116 on Wed Dec 11, 2013 7:01 pm

http://www.screwfix.com/p/bottle-air-vent-15mm/34359
this is what I was thinking of plumbing in around the highest point. having not stripped out a dash not sure how much room there is.
what are your thoughts on this guys?

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Re: bit the bullet.

Post by HighlyJetted on Wed Dec 11, 2013 7:13 pm

You don't need to buy anything or re-design anything.

It just need sorting properly.
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Re: bit the bullet.

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