Thread: How hot is too hot?

If you research the liner problem that our engines suffer from you will hear of high temps being the cause (one of the potential causes) of slipped liners.

In Australia during summer ambient temps are quiet often 35c+ its a fair bet to say running an 88c thermostat is not a good idea, it may work fine in the UK.
I use an infra red temp gun on my hoses from time too time and she seems to sit between 88-92c.
Yep the dash gauge is pretty well set in its ways, even on a 45c day it will barely run over 12 o'clock.
I have had my P38 11 yrs and its never boiled or seen the gauge over the 12 O'clock point.
If i was running at 105c under heavy driving conditions i would not be concerned too much as long as the temp comes back down at lower load. If not i would be looking into things a bit.

Can't remember psi of system but for every psi add 2 degree's F to boiling point ie Boiling point of water 212 F so 212 f + 10lb pressure cap = 232 degrees F boiling point. Thats for plain water goes higher with additves. So 103 C is well with in limits. But as RR P38 has said as long as temp has gone down went load is take all should be O'k

Gary

Would like to find out more about slipped liners and the consequences. Also how to identify it. Any info would be great.

I recently changed my radiator as i had just the smallest of leaks on the fitting that runs back to the expansion tank. I figured after being in there 16 odd years it must be well on its way to being a potential problem.
How wrong i was. One afternoon while bored i pulled the top tank off to have a look, to my suprise it was very clean in there i had 2 of the cooling fins partially blocked (casting swarf) and a small amount of sediment around the top of the core on the seal.
Every 18-24 months over the last 11yrs i have had my RR i have flushed and changed the coolant. I have never had an over heating issue.
Undoubtedly high temps (boiling) will cause your block to expand (as its alloy) beyond the expansion of the liner.
As far as i can tell there is only an interference fit between the liner and the block.

I had heaps of cooling related issues over about a 18 month period a few years back, and in the end it was all electrical gremlins. How ever I did fit a temp gauge with several readouts and put them on the inlet and exit of the radiator, highest temp I ever saw was 106, and the average running temp once warm was 93-95. It quite often got to 98-99 and in summer (Adelaide 35 plus) it often hovered around 100-103 in stationary traffic.

Haven't had the gauge on for nearly 2 years, but I don't think that temp is to be worried about unless it remains that high whilst moving.

As I have posted many times...

Modern Falcons often run over 118c on hot days when working hard and this is considered within the normal range

A cooling specialist for race cars once told me...

"If it isnt purging out, its not too hot"

Originally Posted by redandy3575

Would like to find out more about slipped liners and the consequences. Also how to identify it. Any info would be great.

All you need to know here..................
JE Robison Service — the blog: The last word on Land Rover liner failures - I hope!