jonah

jonah

Active Member
Hi All,

My 1st trip on the motorway with the new deafener was interesting,apart from vague steering and oil light flicker. Can anyone give me some advice on the temperature gauge on my 200tdi. Travelled across to Mancunia a trip of 45-50 miles @ 65-70mph, when I got over there the temp gauge was at the top of the white area and I was concerned it would have headed into the red if I'd travelled any further. Once on local roads & lower speeds it quickly returned to the middle of the gauge. Is there a problem or is this another quirk of my new 200tdi??

Ta

Jonah ( A new Deafener worrier!!!):confused:
 
Obviously when your engine is running at higher revs, there's more compression and a higher level of combustion of the fuel which inevitably means more heat. This doesn't however mean that your temperature gauge should increase drastically, and I would consider one of two things:

1) Your thermostat is sticking closed (which means that the water isn't running out of the engine block towards the radiator and the water in the block is then heating up and in effect, over heating).

2) Your cooling system is blocked or gunked up.

Just Wednesday I travelled from Weymouth to Leeds in my 2.5 N/A at 65 to 75 mph and the temperature gauge sometimes dropped right down to almost cold (a sign of the thermostat sticking open). I know that the system is clean because its been flushed thoroughly three to four times within the last year for engine rebuild purposes. I know that it's the thermostat because it was manufactured by Britpart and is no doubt faulty or unreliable.

Consider replacing the thermostat. It's a relatively simple job.

-Pos
 
pos said:
Obviously when your engine is running at higher revs, there's more compression and a higher level of combustion of the fuel which inevitably means more heat. This doesn't however mean that your temperature gauge should increase drastically, and I would consider one of two things:

1) Your thermostat is sticking closed (which means that the water isn't running out of the engine block towards the radiator and the water in the block is then heating up and in effect, over heating).

2) Your cooling system is blocked or gunked up.

Just Wednesday I travelled from Weymouth to Leeds in my 2.5 N/A at 65 to 75 mph and the temperature gauge sometimes dropped right down to almost cold (a sign of the thermostat sticking open). I know that the system is clean because its been flushed thoroughly three to four times within the last year for engine rebuild purposes. I know that it's the thermostat because it was manufactured by Britpart and is no doubt faulty or unreliable.

Consider replacing the thermostat. It's a relatively simple job.

-Pos
Click to expand...

" when your engine is running at higher revs, there's more compression and a higher level of combustion of the fuel which inevitably means more heat."

:confused: wud yu mind explaining how the compression increases with speed and you get a higher level of combustion?:confused:
all that happens is that you get more heat, coz yu is banging faster and the heat input is greater than the cooling system can remove, and therefore the engine temp rises.
 
The Mad Hat Man said:
" when your engine is running at higher revs, there's more compression and a higher level of combustion of the fuel which inevitably means more heat."

:confused: wud yu mind explaining how the compression increases with speed and you get a higher level of combustion?:confused:
all that happens is that you get more heat, coz yu is banging faster and the heat input is greater than the cooling system can remove, and therefore the engine temp rises.
Click to expand...

That's exactly what I mean. There's more compression per minute than there would be at lower revs if you like, so more heat is generated at a quicker rate
 
Also, above about 45-50 miles per hour (ish) moving air isn't as effective at cooling, so you are making all this heat, but not actually getting rid of it any faster.
 
just got this problem resolved with my td 90.it did exactly the same as yours.i spent 2hrs jet washing the mud out of the rad but no difference.when the garage finally took the rad off it was 4kg heavier than a normal rad as it was still blocked up with mud in the middle and you couldnt see thru the rad.if you do offroading take the couling off and have a quick look at the back of the rad you might be suprised what you will find..
 
I was told it in a physics A level lesson - it is due to the rate of transfer of energy, i.e. the air moving faster gets to a point where it can't physically transfer the energy any faster. It is different for different substances, like if your rad was moving through water or summat it would be a different speed.

Thats how i understood it anyway.
 
boydy1989 said:
I was told it in a physics A level lesson - it is due to the rate of transfer of energy, i.e. the air moving faster gets to a point where it can't physically transfer the energy any faster. It is different for different substances, like if your rad was moving through water or summat it would be a different speed.

Thats how i understood it anyway.
Click to expand...
:confused: :confused:
 
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