Temperature readings 924S/944

[PaulHere]

Take a look at Nicks e-mail and see what you think of the problem.
I note that the 944 area has a poll regarding engine temperature readings - can we take it as read that the 924S gauge readings will be identical to the 944?

Dear Paul
Unfortunately I have had lots of problems recently with my 924S (1986) and it is currently undergoing an engine transplant! I wrecked the big end shells (one spun on the crankshaft) and I bent a conrod! This follows a rebuilt cylinder head a few months ago.

I think a constantly hot running engine may be partly to blame?
Do you know what is the normal position for the temperature gauge to read on this model?
My cooling fan cuts in just as the needle on the gauge is in the first part of the "red section". (Which I am concerned is too hot and too late?) I had the temperature switch replaced Oct 03 and had a new radiator fitted at the time of the cylinder head rebuild (September 04). I am also fairly certain all hoses are good.

Any ideas?

Regards
Nick Aish

 

[usermjg]

I have posted on this before, my fan cuts in also just as the needle hits the red which for a long time concern me, the answer was to wire up a manual over ride switch which can be opperated from the cab, under normal working conditions it does not need to activated as the needle will sit in the middle of the gauge, it is only when sitting in traffic for a given period of time that the needle will greep. At this point i turn the fan on manually and bongo no over heating problems not elegant but practical, my top tip would be to fit a switch which lights when activated to warn you that its running as it will still operated even when the engine is turned off and over night this will flatten the battery.

Marc

 

[924nutter]

ORIGINAL: PaulHere

Take a look at Nicks e-mail and see what you think of the problem.
I note that the 944 area has a poll regarding engine temperature readings - can we take it as read that the 924S gauge readings will be identical to the 944?

Dear Paul
Unfortunately I have had lots of problems recently with my 924S (1986) and it is currently undergoing an engine transplant! I wrecked the big end shells (one spun on the crankshaft) and I bent a conrod! This follows a rebuilt cylinder head a few months ago.

I think a constantly hot running engine may be partly to blame?
Do you know what is the normal position for the temperature gauge to read on this model?
My cooling fan cuts in just as the needle on the gauge is in the first part of the "red section". (Which I am concerned is too hot and too late?) I had the temperature switch replaced Oct 03 and had a new radiator fitted at the time of the cylinder head rebuild (September 04). I am also fairly certain all hoses are good.

Any ideas?

Regards
Nick Aish

Before we develop mass hysteria about hot engines, bear this in mind. The temperature gauge of a car doesn't read until the thermostat starts to open, and this opening temperature is stamped on the 'stat, typically 85 deg C. I seem to remember seeing 90 on the side of the fan switch, so this means that the whole deflection of the needle, up to the edge of the red sector is only 5 centigrade degrees. A system with a 15 lb radiator cap will theoretically boil at 100.57 deg C, as 15 psi is fractionally above atmospheric pressure of 14.7 psi. so as long as the fan cuts in and starts to reduce the temperature before the needle goes off the scale I think we should all worry a little less, but do monitor it , as old, silted up radiators will not work as well as when they were first installed, and old radiator hoses may not hold up at 15psi.

 

[Guest]

There's an ongoing survey of temperature readings in the 944 section. This indicates that most 944 operate at about 80C (within the tolerance of the gauges) I would say that anything outside the main area of the survey would indicate something that's not normal.

 

[usermjg]

This may be so to a point but these engines are getting on in years and there fore will act alittle different from each other, i dont think it's to much to worry about as long as the needle stays out the red.

MArc