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[GardO71]

Hey peeps

i bought a 2002 '02' reg 2.6 V6 last tuesday ,suspect HG but i'm not convinced, it runs superb, the only things noticed are

1: Mayo on oil filler cap(i've taken filler extension of and cap is directly in rocker cover)

2: very slight Mayo in expansion tank(there are no petrol fumes in tank)

3: yesterday whilst left running for 20 minutes the temp gauge went up to just over 100 and it lost water through expansion tank cap, but today i found out the cap seal is split in half.

before yesterday i have driven it quite a bit and the gauge got to 85 and when the fans kicked in the temp dropped back to 80, and it pulls really well with no other problems, other than EML being on constantly.

i have read a few bits on here regarding oil coolers and HBV, but could it really be that simple, or should i get it pressure tested?

[joshwyatt]

Where abouts are you?
I see your near Oxford, I'm in Kidlington...and there are other local members.
I'm sure someone could take a look at it for you.

Initially I would have said oil cooler failiure, due to the fact there is contamination in the header tank.
Have you checked the dipstick? Is that free from mayo?
HBV (Heater bypass valve) is at the back of then engine, you would notice coolant underneatht eh var normally.
There's also an Oxford meet coming up soon with hopefully a good turn out, it may be worth coming along to intorduce yourself and hopefully the combined knowledge of the members will give a definite prognosis of the issue.

[GardO71]

Where abouts are you?
I see your near Oxford, I'm in Kidlington...and there are other local members.
I'm sure someone could take a look at it for you.

Initially I would have said oil cooler failiure, due to the fact there is contamination in the header tank.
Have you checked the dipstick? Is that free from mayo?

HBV (Heater bypass valve) is at the back of then engine, you would notice coolant underneatht eh var normally.
There's also an Oxford meet coming up soon with hopefully a good turn out, it may be worth coming along to intorduce yourself and hopefully the combined knowledge of the members will give a definite prognosis of the issue.

cheers for quick reply.

No ,theres no mayo on dipstick, oil looks quite clean actually.

how do i test the HBV,there are no other leaks anywhere other than the expansion cap seal.


i'm actually in Bicester, i put Oxford as people have more likely heard of that than Bicester lol

[joshwyatt]

I think the best thing to do, would be to replace the expansion cap first. I've never had an issue with the HBV, so I must admit I'm not the best to advise. But from what I recall from others, you will notice coolant on the floor underneath. If you have no visible signs of leakage I would not be looking at the HBV.
So, replace expansion cap first.
I suppose, you could peform a coolant flush and change, and see what happens.

[TheBoy]

Do you have history? Has it had a recent oil cooler failure?  If not, I'd stop using car *NOW* and replace the oil cooler.  Continued used will make it a nightmare to fix.

If it has suffered a recently repaired oil cooler failure, sounds like it needs a good flush a few times, then proper antifreeze concentrate.

Oil coolers fair due to poor servicing, so once its fixed, I'd be inclined to give it a couple of quick services, a few hundred miles apart.



As Josh says, worth popping down to Kidlington this Sunday to meet a few local members

[GardO71]

Do you have history? Has it had a recent oil cooler failure?  If not, I'd stop using car *NOW* and replace the oil cooler.  Continued used will make it a nightmare to fix.

If it has suffered a recently repaired oil cooler failure, sounds like it needs a good flush a few times, then proper antifreeze concentrate.

Oil coolers fair due to poor servicing, so once its fixed, I'd be inclined to give it a couple of quick services, a few hundred miles apart.



As Josh says, worth popping down to Kidlington this Sunday to meet a few local members

LOL no worries about not using car, it's just run out of mot so will not be using it in foreseeable future.

no i haven't got any history whatsoever unfortunately, just know the old boy(70's) owned it tuesday when i got it.

it has been well looked after but he can't find any of his history.

i'll change cooler first and try flushing the system out.
what do you recommend to flush it through???

[hotel21]

what do you recommend to flush it through???

Bleach and Gunk/Jiser have all had success, as I recall.  Copious amounts of fresh water as well!!

[TheBoy]

Forte do a special one to use after you have fixed oil cooler - called something like Forte coolant cleaner for oil cooler failures...

[Squealey]

Just as a side note, when my 2.5TD head gasket failed I initially thought (hoped) it was the expansion tank cap as this had a big split in it causing it to come loose and overheat. Turns out it was BECAUSE the hg failed that the pressure got so great it literally split the cap when it got pushed off.

They sell the caps in Halfrauds for under £4.

[GardO71]

right, before i go further, many thanks to MarksDTM for pointing me in the right direction to upload pics..........

so if it don't work, blame him lol.............only joking, thank you.

ok

today i stripped down my mig 2.6, all i'll say is......
what idiot designed a car like this, for such a big car they tried to cram everything into a half square metre for some reason................WHY!!!!!!!!!!

phew, rant over.

can i have some opinions please, rude or unpleasant accepted too lol, i think it is obvious it is the cooler, but not being too experienced with these cars,every comment helps.

i've taken 5 pics in total, not sure how they'll come out here, but here goes nothing.

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as i said, any, and i mean any comments greatfully accepted, i just won't talk to you after lol

Dave

[tunnie]

the condition of oil/coolant mix around that defo suggests oil cooler but what looks odd is the cooler itself looks in ok condition  :-/

[GardO71]

the condition of oil/coolant mix around that defo suggests oil cooler but what looks odd is the cooler itself looks in ok condition  :-/

i don't know how the identification marks on GM stuff works, but if i read it right it may have been replaced cos it's got the GM part number and at the end it says '46/06', so is that 46th week of 2006 or am i mistaken.

but yes, it does look ok to me too. haven't cleaned it up yet,hopefully do that tomorrow afternoon after work.

[Marks DTM Calib]

I would say that it has already had a change and not been flushed very well as that cooler is brand spanking new

[Marks DTM Calib]

I should add that if the cooler has failed, the mayo would look a lot creamier and fresher, that looks old and congealed.

As for cramming it in, remember that its a 54Deg V setup which has to fit front and rear wheel drive applications

[GardO71]

I would say that it has already had a change and not been flushed very well as that cooler is brand spanking new

how would i test it to make sure it's not leaking???

it could well have been as you say, cos there are remnants of mayo  left in expansion tank but the antifreeze is pretty good, the old expansion cap rubber was perished so it was letting water out, i got a new one today but stripped engine before trying it lol