Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[semisheen]

Previously in the past week the car has overheated two times through a leak in the radiator …anyway this is sorted now …and normally driving it is fine anyway today steep duel carriageway very hot day air con on flat out …looked at the temp it was nearing 100 degrees again, thought oh no water leak again slows down to 70 ish within 2 mins temp was normal again checked water not lost a drop  …..i don’t know what to think as I say normal driving its fine could it be head gasket on its way out / water pump ?

[VX1]

I do believe this is normal but i'm sure someelse in the know about TD's will be along shortly.

Paul

[amba]

Worth giving the whole lot a good flush out,then refill with a 50/50 mix of red GM coolant..if that doesn,t improve the temperature would then suspect water pump is struggling

[semisheen]

Thanks VX1 ....im not scared of gettin me hands dirty but the thought of that big head & chains does me head in 

[Richard A]

Hello, I have driven many 10s x 1000s of miles in Omega's (2.0/2.5/3.0/2.2 dti) since the early 90's, this is the golden rule - 'no coolant loss and fan's kick in- no problem', yes it may seem basic but it's worked, if the HG has gone a) it's rare b) it's bigger problems than you discribe. It maybe the rad needs a clean out but the rest is normal.
regards
richarda

[Seth]

Previously in the past week the car has overheated two times through a leak in the radiator …anyway this is sorted now …and normally driving it is fine anyway today steep duel carriageway very hot day air con on flat out …looked at the temp it was nearing 100 degrees again, thought oh no water leak again slows down to 70 ish within 2 mins temp was normal again checked water not lost a drop  …..i don’t know what to think as I say normal driving its fine could it be head gasket on its way out / water pump ?

Mine's exactly the same bud ........

It's got a brand spanking new rad, water pump and 'stat; plus Vx red antifreeze at 50% strength. The viscous fan is fitted, and with both rad fans running there's almost no difference.

I doubt if the head gasket is the problem, as there's no undue pressure.

Best to keep the lump revving quite hard - don't let it labour, as the temperature will go even higher!

[Seth]

As an aside, I had Markseth's tractor in a few weeks ago.

It performs absolutely brilliantly, but the temperature  rises exactly the same on this one too!
Normal running temp should be around the 92 mark - just below mid-point on the gauge.

[unlucky alf]

just to add that i get exactly the same, on the motorway doing 90-95 for any length of time the temp gauge really begins to rise to just below 100 on these hot days, but when i slow down to about 70 it stays a constant 95 degrees or thereabouts

[MickAP]

Mine doesn't usually budge from zero, but it did do today with the aircon on full.
Yep I know my stat has gone, got one on order along with a new pump just for good measure.

It always sits at normal temp when towing, and never really gets above say 90 even uphill.

Mick

[Omegatoy]

Seen this on a couple of Omega tds now, and they are always blooming sludgepumps!!! my manual doesent matter what speed i do or how high the revs over a prolonged period
it rises very slightly on motorway which i would expect,
but it climbs higher when blasting up long steep hills,  but as soon as it goes over the crest it starts to come down again, it never gets more than 3/4 up the gauge tho,

my theory is the sludgepump uses the rad to exchange the heat from the box to air and the cooling system suffers from the extra work it has to do, hence the higher heat range? anyone care to comment??
Omegatoy

[Seth]

Seen this on a couple of Omega tds now, and they are always blooming sludgepumps!!! my manual doesent matter what speed i do or how high the revs over a prolonged period
it rises very slightly on motorway which i would expect,
but it climbs higher when blasting up long steep hills,  but as soon as it goes over the crest it starts to come down again, it never gets more than 3/4 up the gauge tho,

my theory is the sludgepump uses the rad to exchange the heat from the box to air and the cooling system suffers from the extra work it has to do, hence the higher heat range? anyone care to comment??
Omegatoy

Cheers OT - can you explain 'sludgepump' and 'from the box to air' please dear chap?

[Omegatoy]

Seen this on a couple of Omega tds now, and they are always blooming sludgepumps!!! my manual doesent matter what speed i do or how high the revs over a prolonged period
it rises very slightly on motorway which i would expect,
but it climbs higher when blasting up long steep hills,  but as soon as it goes over the crest it starts to come down again, it never gets more than 3/4 up the gauge tho,

my theory is the sludgepump uses the rad to exchange the heat from the box to air and the cooling system suffers from the extra work it has to do, hence the higher heat range? anyone care to comment??
Omegatoy

Cheers OT - can you explain 'sludgepump' and 'from the box to air' please dear chap?

LOL sorry for those that dont know

SLudgepump = autogearbox

box to air is gearbox heat exchanged in radiator to cool it
I.E gearbox cooler built into side of rad thus making the rad do more work

hows that my good man???

[semisheen]

That last post makes alot of sence
just for the record OT i will still be going ahead with the chip very shortly i still need to get the number of the ecu ...but thers litle point with the auto at the moment ....also when mine hit 100 degrees today it was foot right down   Steep hill about 90ish in third no no doubht the ATF would have been pretty hot giving the radiator reverse effect IE the ATF probably was actually heating the water

[Seth]

Seen this on a couple of Omega tds now, and they are always blooming sludgepumps!!! my manual doesent matter what speed i do or how high the revs over a prolonged period
it rises very slightly on motorway which i would expect,
but it climbs higher when blasting up long steep hills,  but as soon as it goes over the crest it starts to come down again, it never gets more than 3/4 up the gauge tho,

my theory is the sludgepump uses the rad to exchange the heat from the box to air and the cooling system suffers from the extra work it has to do, hence the higher heat range? anyone care to comment??
Omegatoy

Cheers OT - can you explain 'sludgepump' and 'from the box to air' please dear chap?

LOL sorry for those that dont know

SLudgepump = autogearbox

box to air is gearbox heat exchanged in radiator to cool it
I.E gearbox cooler built into side of rad thus making the rad do more work

hows that my good man???

Okay OT - gotcha now ..... !

But ......... what about those of us who have manual-boxed versions?
I remember TheBoy's theory about restricted oilways within the lump itself - doubtless caused by poor servicing earlier in their lives. I'm also aware that there's a fair amount of oil cooled parts within it too. Personally, I feel that there needs to be a greater surface-to-air cooling capacity - a larger capacity radiator. This wouldn't overcool the engine, as the 'stat would still maintain the correct normal operating temperature. Under normal conditions, it would therefore take a little longer to warm-up, hardly detrimental.

I say this, after nearly 20 years experience working on National Bus Co's AEC Reliance buses and coaches.
We had head gasket failures and overheating problems galore, root-cause I reckoned being too small a rad. I was able to prove this by modifying one of them by increasing the rad size by 20%. It ran at correct temp, and we never touched the heads again - in fact it's still running well at 40 years old!

Thought: Is it practical to modify our tractors at this point in their lives?
Anyone ..........

[Omegatoy]

Sethsmate ,
totally agree mate but the room in an Omega is very small, probably the best way to do it would be thicker rad for more capacity, would have to be custom built tho which is costly, and as far as i know Aluminium rads are very poor for cars anyway!!