pinion height question

Thread in 'Technical Questions' started by R34nov80, Jan 13, 2015.

  1. R34nov80

    R34nov80 Member

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    What is the issue here, is the pinion to high or to low? Please see photos.

    Basically I have transferred a 4:1 pinion into a different casing, which required the existing pinion bearing to be retrieve and press on to this new 4:1 pinion, everything with the pinion is good except the height when diff is fitted, looks tell me its to low but the workshop manual suggests a reduction in pinion washer height.

    I apply some titanium oxide to observe the contact between the gears and on the drive side it is high up on the toe end??

    There was a little bit of gear oil applied to submerge the pinion bearing which might show on the outer heel side of the gear ring.

    An help would be much appreciated, thanks.

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  2. R34nov80

    R34nov80 Member

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    more photos

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  3. R34nov80

    R34nov80 Member

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    backside also as the oxide transferred from the pinion freshly marking the ring gear

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  4. Boss

    Boss Member

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    you say you've transfered a pinion, i am assuming with its matching crownwheel? whats your backlash like?
     
  5. Tony N

    Tony N Member

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  6. R34nov80

    R34nov80 Member

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    Thanks for the replies,

    The pinion and ring are a matching 4:1 ratio, I have changed only the pinion bearing to allow it to fit my abs casing.

    All the instructions indicate the pinion is to high on the ring gear, I did not rotate smoothly so I have not used a DTI to check the backlash at this point.

    I press the bearing onto the pinion with a 3.33mm height washers so I will ring Nissan tomorrow to see if the can supply me the parts, I have a Nissan workshop manual it has all the instructions and part numbers.

    The selection of 20 different height washer have 0.03mm increments from 3.09 mm - 3.66 mm (3.09, 3.12, 3.15, 3.18 etc).

    Instructions say lower the pinion away from the ring so I will try the 3.09 and 3.18 to begin with as I am well off with the current 3.33, then reference the contact patches of the meshing gears and adjust with a new height washer according to the instruction.

    So that's where I'm at and I could really use a little more advise from anyone who may have experienced this.

    I have a big hydraulic press and during this build I modified a bearing splitter to safely remove the pinion bearings so it should be possible to finely tune the meshing;

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  7. Boss

    Boss Member

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    yeah that'll work, i would suggest getting a dti and checking your backlash though, 0.004" / 0.006" or 0.1mm / 0.15mm from the FSM,

    did you measure your pinion height in the other casing before you stripped it? there is an actual Nissan tool for measuring/checking/setting pinion height, its like a dummy shaft that bolts into the casing to replace the pumpkin and diff unit, I tried to get one from Nissan and got met with blank looks, and I cant make one as there is no mention of any dimensions anywhere,
     
  8. R34nov80

    R34nov80 Member

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    Both used the 3.33 mm height washer, however the 3.7:1 and the 4.1:1 pinion gear a different sizes.

    I couldn't turn the diff smoothly it did rotate but the meshing is off and I felt knotchy and rough.

    I have read backslash range of 0.13 - 0.18mm being standard values, I did some check before remove the diff from the old case and the meshing was ok, I have not touched the ring gear or diff, only remove and replaced a pinion bearing.

    Calling Nissan in a moment to try get some more height washers.
     
  9. Tony N

    Tony N Member

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    You need to set the backlash before you check the contact patch as both backlash and pinion height affect it
     
  10. R34nov80

    R34nov80 Member

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    cheers
     
    #10 R34nov80, Jan 15, 2015
    Last edited: Jan 15, 2015
  11. deadringer247

    deadringer247 Member

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    Just to revive this thread, I have been doing the same today. Pinion is super high. So high that it actually touches the centre when the cw is bolted in and locks it solid. I always thought the shims would be a little closer to the needed thickness but not mm's out.
    How did you get on with this?
     

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