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

Paul

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

semisheen wrote on 02. Jun 2009 at 17:51:


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!

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

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 wrote on 02. Jun 2009 at 21:52:



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???

Omegatoy wrote on 02. Jun 2009 at 21:59:


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 ..........