Thread: engine and tranny temps

The engine is well within range. I think the ATF is very warm to hot.

were we talking td5 or v8?

i cant comment on the td5 but the v8 temp is about 95.

sorry guys, TD5, tranny shifted smoothly and didnt smell hot, what is the normal range of the tranny

It's worth remembering that the thermostat doesn't fully open until 96°C so the radiator isn't even getting full flow below that temperature. The ECU switches in the fan to assist cooling under normal running at 110°C.

Those two figures give you the endpoints of the range that you'd want to set your alarm temperature in, with the final choice being a determined by how nervous your disposition is. 103-105° is probably a reasonable choice if you want an indication of problems rather than just alerting you that the engine is working hard.

cheers
Paul

Thank you Paul for that valuable info, at least i can rest a bit easier

Cheers

Ken

Originally Posted by OffTrack

It's worth remembering that the thermostat doesn't fully open until 96°C so the radiator isn't even getting full flow below that temperature. The ECU switches in the fan to assist cooling under normal running at 110°C.

Those two figures give you the endpoints of the range that you'd want to set your alarm temperature in, with the final choice being a determined by how nervous your disposition is. 103-105° is probably a reasonable choice if you want an indication of problems rather than just alerting you that the engine is working hard.

cheers
Paul

And confirm the same for tranny preferred operating temps please maestro? Getting close to 2K thanked I see!!!!

Originally Posted by gavinwibrow

And confirm the same for tranny preferred operating temps please maestro? Getting close to 2K thanked I see!!!!

Best information I can find is a page Ashcroft link to as a reference for Auto fluid temps: Transmission Oil

As a summary of the above, for temps measured in the pan/sump:

65°C: minimum operating temperature
80°C-95°C: normal operating range
135°C: max allowable for short durations, such as hill climbs, etc
150°C: transmission damage occurs. Land Rover's docs indicate the solenoids have an operating range of -30°C to +150°C so this seems to be a good indication of the maximum limit.

The gist of the above page is that for every 10°C above 80°C the transmission fluid life halves from 160,000km. Using the chart LR's 40,000km intervals would equate to a running temperature of roughly 100°C. The arduous service schedule recommends 20,000km intervals for transmission fluids, which would equate to 112°C operating temperatures. Obviously there would be a safety margin built in.

So I guess what you can draw from that is:
- don't stress if you are seeing up to 135°C when working the auto hard,
- if you are using the Auto in conditions that see the temps regularly go above 95°C you should be changing Auto fluid more frequently.
- Stop fretting about every quiver of the gauges

cheers
Paul

"Stop fretting about every quiver of the gauges "

Thanks again Paul - if only the gauge would move up from 60 (and yes it is working cos I once got it up to 65).
Looks like time for a Derale thermostat for me (for the reverse purpose of most ie I want it to get the ATF a little hotter) consistent with Ashcrofts excellent advice
Derale 25792 Derale Fluid Control Thermostats