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Thread: Revving the engine to 3000 ZF Safety

  1. 28th June 2014, 09:12 AM #1
    TheTree
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    Revving the engine to 3000 ZF Safety

    Hi

    I need to hold my engine steady at 3000 rpm to do the LPG auto tuning.

    It states here on rr.net that you need to be very careful revving the engine with the ZF

    Transmission Diagnosis & Repair

    It says that once a gear has been selected the system is pressurised so that seems to indicate that it is safe to do as long as you have not selected a gear

    Can anyone confirm this?

    Thanks
    Steve
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  2. 28th June 2014, 09:28 AM #2
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    Scouse
    Scouse is offline OldBushie Gold Subscriber
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    In Park or Neutral will be fine.


    It's when you're in a gear that things start heating up quickly.
    Scott
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  3. 28th June 2014, 09:38 AM #3
    TheTree
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    Thanks Scouse
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  4. 28th June 2014, 10:32 AM #4
    Mocky
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    Start the engine with transmission in park, do not move the shifter out of park.
    Once the shifter has been moved out of park the main clutch will be engaged, it will still be engaged even if you shift to neutral or back into park.
    If you do move the shifter the engine will need to be shut down for for the clutch to bleed off the pressure.
    If this procedure is not followed transmission will be damaged.
    You can also start with the shifter in neutral as long as you do not move the shifter.

    Mocky
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  5. 28th June 2014, 11:21 AM #5
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    101RRS
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    I doubt a P38 would have a torque converter with a stall speed as high as 3000rpm anyway - so if in gear and stationary the engine will never get to 3000rpm.

    Garry
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  6. 28th June 2014, 04:30 PM #6
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    benji
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    I wouldn't take my word over Mocky's; but I do remember reading something about the early zf box not being able to handle reving when first started up. They had to be put into gear and then back into Park before oil would flow. That changed in 91 with the drilling of an extra oil gallery that circumvented that problem


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  7. 28th June 2014, 05:19 PM #7
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    p38arover
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    Something about the A clutch pack, Benji? I recall something about it.

    Wait...


    Maybe this: http://www.mye28.com/viewtopic.php?p=75875
    Ron B.
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  8. 10th July 2014, 12:39 AM #8
    Rage Over Guest
    Yes, this is true. It's that same story for 80's & early 90's BMWs with the 3.5L M30 engine (735iL, 535i, etc.). Those have the same ZF 4hp22 (albeit without a transfer case bolted on it of course), and that is also a problem on those.

    There is a 'fix' for it from memory - for those that want to rev' it after being in gear (relevant for US emissions testing) - that I think involved drilling a small hole in one of the drums to allow pressure to drop.

    I can probably find the tech bulletin if someone's interested but I'm sure it wouldn't be hard to find.

    EDIT: Oops, somehow missed the link in the post above!
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