new head gasket and skimmed head....still high pressure in cooling system

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jamesmartin said:
to get pressure in to coolant system it would have to be a crack in bore unless hgf
Click to expand...

Not seeing cracks in bore....hgf?
But compared to the previous pressure problem it's not as bad as before....actually the only problem is when I switch the vehicle off....only then the pressure starts to build....otherwise it stays normal in the expansion tank. Would like to buy one of the carbon dioxide testers but the liquid would be hard to obtain through customs in my country
 
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Dr_evil said:
Out of question did you use a good gasket ? Some of the poorer makes gaskets aren't worth touching with a ****ty stick on the V8 front no idea on the dervs though as I've never done a derv HG
Click to expand...

Used one of the elring gaskets.....have a MLS gasket but at the time it required too much preparation of the surfaces
 
yes it is but don't snap them, usually an extra 5ft/lbs can help on certain engines

some work loose over time as the caddy engine I built had a spec saying retighten after running but it should be fine on standard torque I'd have thought ?


JM will know for sure though ;)



Opps he beat me to it :p
 
danspann said:
Not seeing cracks in bore....hgf?
But compared to the previous pressure problem it's not as bad as before....actually the only problem is when I switch the vehicle off....only then the pressure starts to build....otherwise it stays normal in the expansion tank. Would like to buy one of the carbon dioxide testers but the liquid would be hard to obtain through customs in my country
Click to expand...

explain your whole symptoms ,how is it on a run ,does it loose coolant
 
danspann said:
Not seeing cracks in bore....hgf?
But compared to the previous pressure problem it's not as bad as before....actually the only problem is when I switch the vehicle off....only then the pressure starts to build....otherwise it stays normal in the expansion tank. Would like to buy one of the carbon dioxide testers but the liquid would be hard to obtain through customs in my country
Click to expand...

I suspect localised boiling, how did you bleed system?
 
Heater on hot
Plastic thermostat bung undone with single hex socket
Radiator top bung undone and filled

I think you have airlock causing circulation issues
 
Oh and thermostat plug if damaged a plumbing one for radiator fits
 
fanatic said:
Heater on hot
Plastic thermostat bung undone with single hex socket
Radiator top bung undone and filled

I think you have airlock causing circulation issues
Click to expand...

No heater anymore....in Trinidad we have no need for it....the heater pipe is blanked off with a blanking cap and the nipple at the back of the head has been replaced with a temperature sending unit
 
jamesmartin said:
i would after ensuring system is completely full ie pouring out of rad plug thermostat housing plug and header tank
Click to expand...

Mr Martin....with respect to the localised boiling....in the middle of the head is a spot for a temp sender which on my old head was blanked off...it was about half inch long....I used a similar threaded bolt to blank off the one on the new head but it is almost 2 inches long....is it possible this is causing a restriction in coolant flow at that area and causing the water to boil?
 
temp sensor for egr , i wouldnt have thought so,coolant will only boil if theres not enough leaving air space, no flow due to no pump etc or cant get rid of heat ie poor rad
 
jamesmartin said:
temp sensor for egr , i wouldnt have thought so,coolant will only boil if theres not enough leaving air space, no flow due to no pump etc or cant get rid of heat ie poor rad
Click to expand...

Ok well on Sunday will try everything I've thought of this past week plus all of your suggestions and get back to you
 
jamesmartin said:
temp sensor for egr , i wouldnt have thought so,coolant will only boil if theres not enough leaving air space, no flow due to no pump etc or cant get rid of heat ie poor rad
Click to expand...

Good day Mr Martin, bled the system used a shorter blanking plug at egr temp sender and installed the fan shroud but temp still seems to be high at the head reading slightly more than 180 degrees Fahrenheit at aftermarket guage....83 degrees Celsius at head but slightly less than normal on stock gauge
 
danspann said:
Good day Mr Martin, bled the system used a shorter blanking plug at egr temp sender and installed the fan shroud but temp still seems to be high at the head reading slightly more than 180 degrees Fahrenheit at aftermarket guage....83 degrees Celsius at head but slightly less than normal on stock gauge
Click to expand...

However of I open the thermostat plug there is no coolant in there....but opening the expansion tank quickly fills the thermostat housing back up and temp drops
 
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