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[TheBoy]

I though I had nearly solved it, but I am still getting a lot of pressure building up in the cooling.

Just gave it a bit of a thrashing back from Silverstone round the back roads - about 10 miles. Lots of Captain Slows (story of my day), so most of the way was 40mph cruising.  Had the tech2 monitoring ecu sensors, and temp hit 102.

Whilst that may seem high, remember on these tractors that the high speed fan comes on at 105 according to the markings on the switch.

It built up enough pressure to blow a load of coolant through the cap.

So far, its had:
New water pump (nothing wrong with old one)
New stat (old one drilled)
New rad (old one had a large cold spot)
Replacement expansion bottle
4 caps
A couple of flushes with rad cleaner (Holts Speedflush) - first one brought loads of crap out, 2nd brought nothing out.

I have some Forte coolant flush on order from Ebay, but the scumbag seller seems to be slow getting off his arse and posting it  


I really am stuck for ideas now....

[Dazzler]

If all the hoses are getting equally hot and the heater matrix then my guess would be the headgasket, have you tried a Co2 sniffer in the header tank?

[TheBoy]

If all the hoses are getting equally hot and the heater matrix then my guess would be the headgasket, have you tried a Co2 sniffer in the header tank?

I have not had tank sniffed, as I am absolutely convinced the HG is OK. Remember, this is a diesel, and HGs on diesels are very, very noticable.  The idle is sweet as a nut (noisy as its a tractor), and no bubbles appearing in expansion tank (except after coolant refill as it bleeds the air out).

[wombatcurry]

You say tech 2 temp indicated 102 - what did you see on the dash guage? For info - the dash guage picks the temp off the sensor next to injector2, the one next to injector4 gives info to the engine management system.
Your fans are turning? these are triggered by the thermostats on the rad (speed 1 @ 100/95C, speed 2 @ 105/100C)
Are you sure the system is fully purged of air?
What coolant are you using?
Do you have any fault codes stored? (ie 14 or 15?)

[TheBoy]

You say tech 2 temp indicated 102 - what did you see on the dash guage? For info - the dash guage picks the temp off the sensor next to injector2, the one next to injector4 gives info to the engine management system.
Your fans are turning? these are triggered by the thermostats on the rad (speed 1 @ 100/95C, speed 2 @ 105/100C)
Are you sure the system is fully purged of air?
What coolant are you using?
Do you have any fault codes stored? (ie 14 or 15?)

The dash temp gauge reads rubbish, as I've found out. However, the Tech2 can say what the dash is trying to read (ie, reading the sensor), and its normally a couple of degrees less than the ecu one, though I know the dash one is 'damped' and a few seconds behind.

Low speed fans coming on about 97/98 ish, not sure its getting hot enough for high speed fans.

I have flushed it several times, and believe I have the air out every time.

Using a 50:50 mix of Vauxhall Red antifreeze and tap water.

[TheBoy]

I did have a 15 code, now fixed. Someone had cut one of the wires by the sensor.  As said, this has now been repaired...

[JamesV6CDX]

I know I've gone on about this before...and it's a totally differenet engine

But I had a Peugeot 1.9 TD, and the HG let go on that, just to the point it was pressuring the coolant system when hot.. there were no other misfiring symptoms etc

As said before, I 100% agree that HG is unlikely, but the more I learn about cars, especially listening to Mark, is that you can not overlook a factor in the equation, or assume something is OK, unless you've proven it. Which is why, for the sake of getting a sniffer in the header tank, it might just be worth it?

Even if just to shut me up

[Marks DTM Calib]

I would remove the pipes from the engine and check them all and flush them all individualy, to ensure

A) There are no blockages
B) None of the pipes are de-laminating

I would also then flush the engine from the rear to front with the water pump removed....that way if there are any old stray blades....hopefuly they should come out...

[TheBoy]

I have reversed flushed the block, but from outlet back to stat (stat is on inlet on these).  Worth doing back to pump instead? Will I need a new seal?

[Pitchfork]

Is your Intercooler Fan operating?
Mine was seized up causing the engine to work extra hard & therefore generate more heat
IW

[TheBoy]

Is your Intercooler Fan operating?
Mine was seized up causing the engine to work extra hard & therefore generate more heat
IW

The intercooler fan is working as intended by Vx - ie, only comes on with low speed engine fans...

[Marks DTM Calib]

I think you need to flushing towards the pump...because if there is a past impeller failure stuck in there....its more liekly to come out this way...

[TheBoy]

I think you need to flushing towards the pump...because if there is a past impeller failure stuck in there....its more liekly to come out this way...

OK, I was going to try some of that 2 stage cleaner, but didn't get to shops in time, so will do tomorrow. As part of the thorough flush out afterwards, I will remove pump, and shove a hose in the water outlet to rad....

[TheBoy]

I would remove the pipes from the engine and check them all and flush them all individualy, to ensure

A) There are no blockages
B) None of the pipes are de-laminating

I would also then flush the engine from the rear to front with the water pump removed....that way if there are any old stray blades....hopefuly they should come out...

OK,
Removed the main pipes from rad to block. Both OK, clear, no signs of damage, though it looks like one of them has had the very end trimmed.  They do not appear to be delaminating.

I have removed the water pump and stuck a hose in the coolant outlet (both inlet and outlet are at front of engine), and flushed.  Nothing but clear water. No bits, no impeller blades, nothing.

Whilst the pump was out, using a mirror, I had a peer in.  Behind the waterpump is what is presumably cylinder 1 at an angle.  The wall of this has what looks like hard deposits that I couldn't wipe off  :-/

Any thing else to try?

[TheBoy]

Just repeated another experiment that I had tried before, but now getting different result (probably due to all the other work).

With the heater on HI, the temperature does seem lower.  Just been around the lanes, not thrashing the nuts off it, but not hanging around, and it stayed below 100 degrees.  So done a 90mph trip to Towcester and back (about 20miles on dual carriageway), and it for the most part in stayed around 96 ish, except the long climb from Towcester to Silverstone where it went to 104.

The above was with the heater on HI, and readings from Engine ECU.