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Author Topic: 2.5TD Overheating or overpressurising?  (Read 5776 times)

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TheBoy

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2.5TD Overheating or overpressurising?
« on: 03 April 2007, 20:29:15 »

Right, since replacing the stat which had holes drilled in it, the temp on the TD is more stable.  It sits at 92/93ish, rising to 96ish when pushed.  Never goes outside of this range.

However, when it does get hot, the cap seems to give, losing coolant in the process.

Assuming the dash gauge is accurate (and the correct one - it shows 1/4 as 90, 1/2 as 95, and 3/4 as 100??), and ideas?  Can't check ECU's view on temp, as the coolant temp sensor is fubar...
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TheBoy

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Re: 2.5TD Overheating or overpressurising?
« Reply #1 on: 03 April 2007, 20:36:29 »

and, no, I don't think the HG has gone.
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JamesV6CDX

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Re: 2.5TD Overheating or overpressurising?
« Reply #2 on: 03 April 2007, 20:37:00 »

CTS is fubar'd? Surely then, if the ECU isn't getting the right temp feedback, it won't run right, which could be contributing to the performance issues?

I would say change the Coolant Temp Sensor, and then read the ECU's thoughts on engine temp with your magic Tech2.

If temp appears normal.. then maybe the pressure cap is knackered? Or.. another Air leak causing the pressure ? Does the TD have an HBV?

When the cap starts blowing off.. are the rad hoses rock hard?
« Last Edit: 03 April 2007, 20:40:26 by JamesV6CDX »
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Re: 2.5TD Overheating or overpressurising?
« Reply #3 on: 03 April 2007, 20:40:14 »

Well assuming the guage is ok.....i would have said 95 is normal temp as its in the middle.....tho 95 sounds a bit hot for a diesel, they usually run a tad colder than petrols.
My merc has a normal operating temp of 80, 80 being in the centre of the guage.

I assume it has the correct instrument cluster in it? ie not one from a petrol?
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Re: 2.5TD Overheating or overpressurising?
« Reply #4 on: 03 April 2007, 20:41:38 »

Quote
CTS is fubar'd? Surely then, if the ECU isn't getting the right temp feedback, it won't run right, which could be contributing to the performance issues?

I would say change the Coolant Temp Sensor, and then read the ECU's thoughts on engine temp with your magic Tech2.

If temp appears normal.. then maybe the pressure cap is knackered? Or.. another Air leak causing the pressure ? Does the TD have an HBV?
Waiting for the intake gaskets to turn up before I change sensor.  I agree, it may affect performance. Certainly buggering up g/box, as that is moaning that the engine is moaning about coolant temp.

Tried 3 coolant caps now.

TD does have a HBV (different to v6), but I am fairly sure there are no leaks....
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Marks DTM Calib

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Re: 2.5TD Overheating or overpressurising?
« Reply #5 on: 04 April 2007, 08:00:24 »

I still say your rad is blocked......perhaps I need to borrow the infra red temp probe or thermal camera from work one weekend.....
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Re: 2.5TD Overheating or overpressurising?
« Reply #6 on: 04 April 2007, 08:11:36 »

Quote
I still say your rad is blocked......perhaps I need to borrow the infra red temp probe or thermal camera from work one weekend.....
Blocked rad was something Omegatoy suspected.

However, the right side (looking from front) is hot, and gets progressively cooler towards the left.  I have checked top and bottom, though can't reach middle.  Is this right?
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Andy B

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Re: 2.5TD Overheating or overpressurising?
« Reply #7 on: 04 April 2007, 08:13:21 »

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......perhaps I need to borrow the infra red temp probe or thermal camera from work one weekend.....

What's your job when you have a TIC camera at work? The last time I used a thermal imaging camera was fire fighting in the RN.  :y
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Re: 2.5TD Overheating or overpressurising?
« Reply #8 on: 04 April 2007, 08:23:39 »

We use it for looking at complex circuit boards during the eval phase to look for hot spots......nice bit of kit.....about 25K's worth...
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Re: 2.5TD Overheating or overpressurising?
« Reply #9 on: 04 April 2007, 08:25:23 »

Quote
We use it for looking at complex circuit boards during the eval phase to look for hot spots......nice bit of kit.....about 25K's worth...
Will it work through the a/c condensor?

Do you still think its rad, despite my comments that it seems to get evenly cooler right to left?
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Marks DTM Calib

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Re: 2.5TD Overheating or overpressurising?
« Reply #10 on: 04 April 2007, 08:49:51 »

Its the middle section thats important....on end is likely to warm up jut via conduction....
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Re: 2.5TD Overheating or overpressurising?
« Reply #11 on: 04 April 2007, 08:52:00 »

Quote
Its the middle section thats important....on end is likely to warm up jut via conduction....
Is it possible to get it checked somewhere before I blow £200 on new rad?
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Re: 2.5TD Overheating or overpressurising?
« Reply #12 on: 04 April 2007, 11:50:28 »

Quote
Quote
I still say your rad is blocked......perhaps I need to borrow the infra red temp probe or thermal camera from work one weekend.....
Blocked rad was something Omegatoy suspected.

However, the right side (looking from front) is hot, and gets progressively cooler towards the left.  I have checked top and bottom, though can't reach middle.  Is this right?

No, middle is centre ::)
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JamesV6CDX

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Re: 2.5TD Overheating or overpressurising?
« Reply #13 on: 04 April 2007, 13:22:26 »

Quote
Quote
Its the middle section thats important....on end is likely to warm up jut via conduction....
Is it possible to get it checked somewhere before I blow £200 on new rad?

Take it out for a really good reverse flush?
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Re: 2.5TD Overheating or overpressurising?
« Reply #14 on: 04 April 2007, 13:24:17 »

Quote
Quote
Quote
Its the middle section thats important....on end is likely to warm up jut via conduction....
Is it possible to get it checked somewhere before I blow £200 on new rad?

Take it out for a really good reverse flush?
From what I've heard, the tractors are prone to rad silting, and no amount of normal flushing affects it. Caustic Soda may shift it, but will probably knacker the rad...

I would have though that the silt would have silted up the bottom of the rad, yet that seems (heat wise) normal...
« Last Edit: 04 April 2007, 13:27:57 by TheBoy »
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