Home > Technical (L322) > Transmission Overheat: Real Problem or a Glitch? |
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northernmonkeyjones Member Since: 24 Mar 2012 Location: derby Posts: 8516 |
can't see how on the last graph it can go from cold to 140+ deg then back to cold in a minute..... it could be that the sensor is starting to break down.
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7th Nov 2018 9:17pm |
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ramigojag Member Since: 29 Oct 2018 Location: Sydney Posts: 17 |
It goes from around 90 degrees to 140 degrees back to 90 in around a second. Thats a zoomed in version of the highest spike in the previous graph.
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7th Nov 2018 9:32pm |
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northernmonkeyjones Member Since: 24 Mar 2012 Location: derby Posts: 8516 |
looking at the description in RAVE it looks like the sensor is part of the internal wiring harness in the pan
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7th Nov 2018 10:00pm |
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RRPhil Member Since: 22 Aug 2011 Location: Blackburn, Lancashire Posts: 964 |
In case it helps, the internal wiring harness should be available from a Land Rover, BMW or Jaguar parts department. The part numbers are :
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7th Nov 2018 11:26pm |
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ramigojag Member Since: 29 Oct 2018 Location: Sydney Posts: 17 |
Thanks Ill try ringing around them to see who does the best price as well as trying to find a local ZF distributor. Current:
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7th Nov 2018 11:35pm |
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ramigojag Member Since: 29 Oct 2018 Location: Sydney Posts: 17 |
Do you manufacture the harness RRPhill?
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11th Nov 2018 8:52pm |
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fisha Member Since: 25 Sep 2009 Location: Scotland Posts: 1350 |
Thats the gearbox ECU reacting to the high temp reading as well as the transmission overheat message displaying. On overheat, I think I'm right in saying that the gearbox drops to a lower gear in order to raise the rpm of its oil pump pushing fluid to the cooler so it can shift more of the hot fluid out to get it cooled. As aside on cooling ability for the gearbox: I see its a 4.4 BMW unit, and from the temp readings its holding 105°C ... which it should. That is working correctly. That being said, a number of people (including myself) felt it was beneficial to modify or fit a lower temp stat to the engine to bring it down to ~90°C operating temp. There are plenty of threads on this forum and others about it. Some modify the existing housing with a spacer and different stat within. I changed the whole stat for a lower temp one which was a case of 4 bolts to remove and refit. The benefit of lower engine temp is also that it gives the gearbox fluid more cooling too cause the gearbox fluid dumps its heat into the engine coolant. 90°C coolant is going to suck more heat out of gearbox fluid than 105°C coolant. V8 or else ... |
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13th Nov 2018 8:58pm |
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ramigojag Member Since: 29 Oct 2018 Location: Sydney Posts: 17 |
Yes, I know why it downshifts which is what I expect it to do.
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14th Nov 2018 12:51am |
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fisha Member Since: 25 Sep 2009 Location: Scotland Posts: 1350 |
No worries, its just a personal opinion that 105°C overly stressed the components in the system and lowering its running temp makes it stay healthier for longer.
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14th Nov 2018 9:48am |
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ramigojag Member Since: 29 Oct 2018 Location: Sydney Posts: 17 |
I agree with you, it is a job for the future though. Maybe in 6 - 12 months time. What I mean is the hoses, rad, pump etc are all in good condition and relatively new so I am not concerned with them letting go soon, but I agree in the next 12 months at some time I will try the thermostat mod to relieve pressure on those components.
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15th Nov 2018 8:48pm |
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ramigojag Member Since: 29 Oct 2018 Location: Sydney Posts: 17 |
I'm updating this more for my own future reference and incase anyone else has the same glitchy problem as me.
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30th Nov 2018 6:34am |
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