Omega Owners Forum - Coolant leak, left hand rear of engine.

Mike Collins

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North of Bristol
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Drives: 2003 2.6 CDX, 1998 2.5 Elite, now BER at 262,000 miles

Coolant leak, left hand rear of engine.
11. May 2011 at 16:10

I'm trying to find the source of this leak, started suddenly this morning. It's not the HBV, so far I've got the plenum and manifold removed, oil cooler plate is dry.
Hoses to the HBV removed and checked, coolant bridge is off and looks ok.
Coolant transfer pipe at rear of block not showing leakage in inspection mirror, it seems that the leak is below the dispack level.
Any ideas what is in that area that could leak under pressure?
2.5, 262,000 miles so far.

All ideas gratefully received.

Mike.

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Darth Loo-knee Court Jester Offline "If you only knew how much he likes Backsides!" Posts: 20248 Stoke-on-Trent Gender: Drives: An Omega in the Pipeline.....	Re: Coolant leak, left hand rear of engine. Reply #1 - 11. May 2011 at 16:27 On the head which is difficult to see because of the dispack is the Core Plugs... or you have the head gaskets.. Saying the Core Plugs though they usually leak without starting the car up, the water will just pour out..
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Mike Collins Senior Member Offline Posts: 532 North of Bristol Gender: Drives: 2003 2.6 CDX, 1998 2.5 Elite, now BER at 262,000 miles	Re: Coolant leak, left hand rear of engine. Reply #2 - 11. May 2011 at 17:37 That's what I was afraid of, I've just managed to remove the dispack to get a better view- of its mounting bracket! I'm wondering if this is worth pursuing, do I take the head off, or give up. Decisions, decisions. I suppose a head gasket is cheaper than another car, but by how much? Mike.
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Mike Collins Senior Member Offline Posts: 532 North of Bristol Gender: Drives: 2003 2.6 CDX, 1998 2.5 Elite, now BER at 262,000 miles	Re: Coolant leak, left hand rear of engine. Reply #3 - 11. May 2011 at 17:48 Next question, I have a part number of 9118338 for a head gasket for a 2.5, not the same as a 2.6. Anyone have any reccomendations for suppliers? Mike.
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Darth Loo-knee Court Jester Offline "If you only knew how much he likes Backsides!" Posts: 20248 Stoke-on-Trent Gender: Drives: An Omega in the Pipeline.....	Re: Coolant leak, left hand rear of engine. Reply #4 - 11. May 2011 at 18:27 2.5 are different from 2.6 head gaskets. Get in touch with Trechi he will supply you with Head Gaskets and Bolts His number I will PM you
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Jimbob Global Moderator Admin Team Offline Third nipple removal completed succesfuly Posts: 20462 Chester / Flintshire Gender: Drives: 52 3.2 MV6 Estate & 98 3.0 MV6 Manual Estate	Re: Coolant leak, left hand rear of engine. Reply #5 - 12. May 2011 at 13:45 I had a weeping core plug for a long time on my old car, lost a couple of litres over a hundred miles. more on short trips less on long trips leading me to suspect leaks from cold / cool, but expansion slows leak down.
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Mike Collins

Senior Member

Offline

Posts: 532
North of Bristol
Gender: male

Drives: 2003 2.6 CDX, 1998 2.5 Elite, now BER at 262,000 miles

Re: Coolant leak, left hand rear of engine.
Reply #6 - 12. May 2011 at 21:47

Well the head is finally off, that's not easy is it?

The leak does appear to be at the gasket, next job is to check for distortion and then decide whether to continue.

One more interesting thing, no6 plug has not been changed for a very long time, it would not come out with reasonable torque. Looking at it from the combustion chamber side, it was six or so threads short of complete insertion, ran fine. It's out now and the threads retapped, perhaps I should have been more determined but before the failure there was too much to lose.

Mike.

Mike.

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car doctor Newbie Offline Posts: 2 Drives: omega	Re: Coolant leak, left hand rear of engine. Reply #7 - 12. May 2011 at 23:16 Darth Loo-knee wrote on 11. May 2011 at 16:27: On the head which is difficult to see because of the dispack is the Core Plugs... or you have the head gaskets.. Saying the Core Plugs though they usually leak without starting the car up, the water will just pour out.. how easy are they to refit?
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Andy H

Omega Knight

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Posts: 1833
Cornwall
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Drives: 03 2.6 Elite Auto

Re: Coolant leak, left hand rear of engine.
Reply #8 - 12. May 2011 at 23:21

car doctor wrote on 12. May 2011 at 23:16:

Darth Loo-knee wrote on 11. May 2011 at 16:27:

On the head which is difficult to see because of the dispack is the Core Plugs... or you have the head gaskets..
Saying the Core Plugs though they usually leak without starting the car up, the water will just pour out..

how easy are they to refit?

Easy to fit a new one with the head off or the engine out of the car.
Getting the old one out (and a new one in) is 'character building' Roll Eyes

in the car due to the lack of access.

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Previous vehicles: Viva, Chevette, Astra mk2, Carlton mk1, Astra mk2, Land Rover SerIII, Carlton Mk2, Range Rover, Omega 2.5 V6
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Mike Collins

Senior Member

Offline

Posts: 532
North of Bristol
Gender: male

Drives: 2003 2.6 CDX, 1998 2.5 Elite, now BER at 262,000 miles

Re: Coolant leak, left hand rear of engine.
Reply #9 - 13. May 2011 at 09:05

Character building looks to be quite an understatement, I have one on the bench at the moment, the core plugs are behind the dis pack mounting bracket. Trying to remove that bracket in the car would turn my character to suicidal.
There are two countersunk torx screws on the upper rear face and one under the horizontal section.

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