P38A p38 Rang Rover 2.5td Torque Converter Lock-up

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wammers said:
And why pray tell us would the fluid get any hotter in park than it does in neutral?
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My theory was the output shaft is locked but the engine is still spinning so that energy will be absorbed by the gearbox (fluid) whereas in neutral both shafts are free to spin so less friction and therefore less heat generated.
 
Grrrrrr said:
My theory was the output shaft is locked but the engine is still spinning so that energy will be absorbed by the gearbox (fluid) whereas in neutral both shafts are free to spin so less friction and therefore less heat generated.
Click to expand...

No my friend not so. Have another think about what happens when the output shaft turns.
 
IIRC the 4HP22 had issues if left in P or N at high revs, but this was supposedly overcome before the P38. I don't know what the issues were but again IIRC I think wammers had an idea.
 
Ratae said:
IIRC the 4HP22 had issues if left in P or N at high revs, but this was supposedly overcome before the P38. I don't know what the issues were but again IIRC I think wammers had an idea.
Click to expand...

Not sure about the HP22 but I'm pretty sure there was an issue in older autos overheating or eating the boxes when left in park for long periods with the engine running. Or maybe it was leaving them in D with the footbrake on. Actually, probably the latter thinking about it.
 
The output shaft does not turn either in neutral nor in park. It makes no difference park or neutral, to the topping up of the gearbox. But park is the safer position because it prevents the wheels turning.
 
Life without my panda is sad
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Grrrrrr said:
Not sure about the HP22 but I'm pretty sure there was an issue in older autos overheating or eating the boxes when left in park for long periods with the engine running. Or maybe it was leaving them in D with the footbrake on. Actually, probably the latter thinking about it.
Click to expand...
The owners handbook suggests that neutral should be selected when stationary much as you would with a manual.
 
wammers said:
The output shaft does not turn either in neutral nor in park. It makes no difference park or neutral, to the topping up of the gearbox. But park is the safer position because it prevents the wheels turning.
Click to expand...
The only difference is the gearbox lock pawl engages when in park locking the output shaft thus stopping the wheels turning.
 
Just to throw my two pence in. My 2.5 started to rev it's tits off on hills like yours is in your video. It was caused by the viscous fan going bad and remaining constantly locked up (which was robbing the engine of what little power it has). It might tie in with your coolant temperature remaining low all the time too.
 
Thats a good shout too, I watched the video and nothing seemed drastically out of the ordinary for an older auto
 
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