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AuthorTopic: P38 Over heating and pressurizing  (Read 8944 times)

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Offline BigBlueBeast

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P38 Over heating and pressurizing
« on: July 01, 2011, 20:04:59 »
Hi all. I would appreciate some help ASAP on this one please. We have a P38, 1996 4.6 V8 LPG converted. It started to overheat yesterday after we turned the cars heaters on. The temperature rocketed up and all the system was highly pressurised. I released the pressure and was left with a little coolant. (the rest was on the floor) I have topped it up, bled the system and it is still doing it....

When idling, the temp is fine, the pressure is fine, even when sitting at 3000 revs

when driving, the temp looks fine, but the pressure goes up within 3 miles.

When all coolant gone, engine overheats.

Can anyone help me with this, I am meant to be going to Leeds on Sunday.

Many thanks.

BBB
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1992 'K' Shogun Mk2 LWB called Misty - 4x roof spots
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Next One - 1986 Land Rover 90, EX-Military Yellow - SOLD
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'YOU NEVER KNOW UNLESS YOU TRY'

Offline eugene

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Re: P38 Over heating and pressurizing
« Reply #1 on: July 01, 2011, 20:17:20 »
hi mate my brother in law hade same problem changed thermostat problem sorted  :azn:
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Offline eugene

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Re: P38 Over heating and pressurizing
« Reply #2 on: July 01, 2011, 20:18:55 »
hope that helps craig his played up at the suffolk show he only got 4 miles down the road
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sj410 wifes offroader
1992 gold 5 door disco winch and bumper spots rooflights .2inch lift. khuno kl 71 265.75.16.rebel steering guard. snorkel
 freelander wifes car
www.norfolk4x4response.org.uk  www.brecklandlrc.co.uk/

Offline BigBlueBeast

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Re: P38 Over heating and pressurizing
« Reply #3 on: July 01, 2011, 22:27:11 »
Hi, I have had the thermostat out, tested with kettle water and it opens. It is now just annoying the hell out of me. I have had the rad off and flushed it out, all seems fine and I cannot see any leaks of water in it. Does anyone want to come and have a look????
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http://www.NCCPhotography.co.uk
1997 'P' 300TDi Disco 1 called Daisy - Sold
1992 'K' Shogun Mk2 LWB called Misty - 4x roof spots
                                                          4x front spots - 440 watts TOTAL atm
                                                          CB fitted - channel 21 - All SOLD
1996 "P" Vauxhall Frontera - SOLD
1992 "J" Toyota Hilux - SOLD
1992 "J" Mitsubishi Pajero - SOLD
1995 "M" Land Rover Discovery V8 - SOLD
Next One - 1986 Land Rover 90, EX-Military Yellow - SOLD
1996 "P" Range Rover P38 4.6 HSE LPG Converted, Blue

'YOU NEVER KNOW UNLESS YOU TRY'

Offline generation-x

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Re: P38 Over heating and pressurizing
« Reply #4 on: July 01, 2011, 22:50:28 »
LPG converted V8 id guess the heads or just one has become pourus :embarrassed:
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Offline BigBlueBeast

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Re: P38 Over heating and pressurizing
« Reply #5 on: July 02, 2011, 08:05:47 »
Just been out to check the coolant level and it is down near the bottom of the resevoir. The viscous fan can be stopped by hand, and the thermostat opens about a mm when put in boiling water
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http://www.NCCPhotography.co.uk
1997 'P' 300TDi Disco 1 called Daisy - Sold
1992 'K' Shogun Mk2 LWB called Misty - 4x roof spots
                                                          4x front spots - 440 watts TOTAL atm
                                                          CB fitted - channel 21 - All SOLD
1996 "P" Vauxhall Frontera - SOLD
1992 "J" Toyota Hilux - SOLD
1992 "J" Mitsubishi Pajero - SOLD
1995 "M" Land Rover Discovery V8 - SOLD
Next One - 1986 Land Rover 90, EX-Military Yellow - SOLD
1996 "P" Range Rover P38 4.6 HSE LPG Converted, Blue

'YOU NEVER KNOW UNLESS YOU TRY'

Offline gingernutsv8

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Re: P38 Over heating and pressurizing
« Reply #6 on: July 02, 2011, 08:09:56 »
Sounds like you have the dredded cracked block common on the 4.0/4.6 i have had a few but gone back to the 3.9 engine as had no probs with them
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Offline BigBlueBeast

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Re: P38 Over heating and pressurizing
« Reply #7 on: July 02, 2011, 13:51:06 »
I have been out today, running on petrol and all seems to be fine. It only does it when we run on LPG. I am thinking knackered vapourizer or issues running hot due to emissions.
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http://www.NCCPhotography.co.uk
1997 'P' 300TDi Disco 1 called Daisy - Sold
1992 'K' Shogun Mk2 LWB called Misty - 4x roof spots
                                                          4x front spots - 440 watts TOTAL atm
                                                          CB fitted - channel 21 - All SOLD
1996 "P" Vauxhall Frontera - SOLD
1992 "J" Toyota Hilux - SOLD
1992 "J" Mitsubishi Pajero - SOLD
1995 "M" Land Rover Discovery V8 - SOLD
Next One - 1986 Land Rover 90, EX-Military Yellow - SOLD
1996 "P" Range Rover P38 4.6 HSE LPG Converted, Blue

'YOU NEVER KNOW UNLESS YOU TRY'

Offline BigBlueBeast

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Re: P38 Over heating and pressurizing
« Reply #8 on: July 07, 2011, 22:43:22 »
Problem is now sorted. It was the internal workings of the vapourizer.  All fixed!!

We have driven over 200 miles without a hair over half way! Even towed a car 30 miles on a trailer.

Thanks for your help everyone.
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http://www.NCCPhotography.co.uk
1997 'P' 300TDi Disco 1 called Daisy - Sold
1992 'K' Shogun Mk2 LWB called Misty - 4x roof spots
                                                          4x front spots - 440 watts TOTAL atm
                                                          CB fitted - channel 21 - All SOLD
1996 "P" Vauxhall Frontera - SOLD
1992 "J" Toyota Hilux - SOLD
1992 "J" Mitsubishi Pajero - SOLD
1995 "M" Land Rover Discovery V8 - SOLD
Next One - 1986 Land Rover 90, EX-Military Yellow - SOLD
1996 "P" Range Rover P38 4.6 HSE LPG Converted, Blue

'YOU NEVER KNOW UNLESS YOU TRY'
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