Author Topic: P12 loosing water  (Read 240 times)

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AlanL

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P12 loosing water
« on: 29 March, 2018, 10:17:02 AM »
Searched the threads. Not much there. But did see there is a bleed screw on the thermostat housing on the P10. But I can't find one on the P12 . So posting here.
Car looses about a liter /week. Until the water tank is dry.
I have pressure tested the radiator system to 0.9 bar and can find nothing. Hold pressure quite well and no obvious water leak. Compression test (head gasket) looks excellent - 160/155/160/160.
So I am a bit puzzled where this water could be going to. Anyone else had an issue like this?
Thanks
Alan



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Re: P12 loosing water
« Reply #1 on: 30 March, 2018, 09:53:34 AM »
how full is the overflow bottle?

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AlanL

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Re: P12 loosing water
« Reply #2 on: 01 April, 2018, 07:21:29 AM »
Well, we fill it to the Max mark. After about a week of running, it is empty.
Alan

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Re: P12 loosing water
« Reply #3 on: 11 April, 2018, 01:53:01 PM »
Was the pressure test done on a cold engine? If so, you may want to try again when it's at normal temperature, and up to 1.1 bar.

Also, those compression test numbers look low for a normally aspirated engine. Was the compression test performed:
- With the throttle closed or wide open?
- With all of the plugs out?
- At normal temp, or on a cold engine?
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AlanL

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Re: P12 loosing water
« Reply #4 on: 12 April, 2018, 09:52:19 AM »
OK, all plugs out. Throttle open, cold engine - for comp test. Maybe should do on warm engine? Was just looking for a bad head gasket.
The radiator pressure test was on cold system too. You are probably right in suggesting better on a hot system. More likely to find a small leak?
Thanks
Alan