Overpressure Cooling system issue and cause
#1
Overpressure Cooling system issue and cause
This was spread across a couple of threads, for simplicity if someone stumbles across it here is the problem and cause.
Hopefully it will be of use
About 1/2 inch loss after 2 or so hours of driving
Coolant loss is from the expansion bottle overflow line.
Rad cap was replaced with a new one
Disco has a 180 Thermostat
Overall Disco Status
Tiny crack in the head gasket at about 4:00 from fire ring to cooling gap
Over time you will start to get milkshake, but it may show up in odd places. In my case:
A couple of further images
Hopefully it will be of use
About 1/2 inch loss after 2 or so hours of driving
Coolant loss is from the expansion bottle overflow line.
Rad cap was replaced with a new one
Disco has a 180 Thermostat
Overall Disco Status
- System holds pressure
- While driving temps between 188 and 194 - 1600 to 2300 rpm 20 to 55 Mph
- Idle at traffic light 197 to 201 depending on how much stop and go drops as soon as rpm increases
- Will reach 201 after highway run at traffic light drops immediately once moving
- Hoses remain soft at 194 -197 degs
- System has pressure in the morning normal pfft noise
- No air at bleed screw
- Engine Warm up appears to be normal not excessively fast
- No misfires or codes
- Heater is blowing hot
- no excessive smoke from tail pipe
Tiny crack in the head gasket at about 4:00 from fire ring to cooling gap
Over time you will start to get milkshake, but it may show up in odd places. In my case:
- the filler cap was ok
- I did the PVC mode and it was not ok milkshake in the PVC valve at the intake
- Milkshake in the throttle body from the passenger side breather tube
A couple of further images
Last edited by Richard Gallant; 01-31-2020 at 03:20 PM.
#2
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shanechevelle (02-02-2020)
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No Doubt (02-01-2020)
#4
Maybe cometic is the way to go. Not impressed by the strength of fire ring. I did not know cometic were available when I did my heads. I used AB composite. Seems to be one factory making the composite versions which are then sold under various names. The Victor Reinz HG has copper O rings. Cometic can be had from summit racing. I have used VR HG's on plenty of engine builds and the composite material was far superior to the composite in the disco HG's. This may be due to use of TTY bolts in the disco, where my other engine builds were just old fashioned torqued. AB has a vid on HG's, sure most of you have seen it... https://www.roverparts.com/resources...-head-gaskets/
Maybe someone here has used cometic's and can give an opinion?
Choices I found:
AB OEM
AB composite (metal side shown)
VR (which looks like composite w copper O rings, backside shown)
Cometic summit racing C4367-040
AB composite HG
Victor R HG
cometic from Summit racing
Maybe someone here has used cometic's and can give an opinion?
Choices I found:
AB OEM
AB composite (metal side shown)
VR (which looks like composite w copper O rings, backside shown)
Cometic summit racing C4367-040
AB composite HG
Victor R HG
cometic from Summit racing
Last edited by XRAD; 02-01-2020 at 06:34 PM.
The following users liked this post:
Richard Gallant (02-02-2020)
#5
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Richard Gallant (02-02-2020)
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