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Thread: Series ‘59 2.25P distributor drive gear fouling on fitment

  1. #1
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    Series ‘59 2.25P distributor drive gear fouling on fitment

    Bit of an issue refitting my distributor drive gear - it just won’t go in! The engine is a ‘59 2.25P with the older “split bush” type. I am aware of all other threads dealing with alignment, but I have stumbled even before that point on the test fit - it just won’t go in more than a few mm. The oil pump is out of the block ATM and I can see the garage floor through the bore where the drive gear and oil pump drive shaft go, and the infamous grub screw has not mistakenly been left in. All looks reasonable there.

    According to the manual it should be a simple drop in/lift out with a set of pliers. I have a late 2.25P petrol with the non-split bush which I investigated and it certainly was a straight drop in/lift out. I tried that drive in the ‘59 engine and it goes in a little further but still only a few cms. And when it came out it had some light vertically oriented scores in the bush which suggests that there may be a problem with the bore not being smooth. Interestingly I have another early (‘61) engine which would also have the split bush type and I can’t budge that one with my pliers? Is the earlier type an interference fit or something? Can’t see that being the case as the old and new type are exactly the same diameter on the callipers?!

    My next step is to give the bore a good go with the hone, but am reluctant to remove metal I can’t put back later.

    Any thoughts on what the above problem might be and how to fix it? Anyone else encountered this before? Unfortunately, my engine reassembly is paused until I can get this resolved.

    Cheers,

    Matt
    Cheers, Matt

    ----------------
    1971 Series 2a 4-cyl (restored)
    1961 Series 2a 4-cyl (undergoing restoration)

  2. #2
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    G'day Matt,

    My thoughts would be to use telescopes to measure the bore for the bush in the block and use a micrometer to measure the size. Then use micrometer to measure the diameter of the bush. ( Calipers are not accurate enough at +/- 0.02mm to measure fit.) This will give you the type of fit you have.

    I would not hone the bore in the block for fit as you have rightly indicated once metal is gone it's gone!.

    I would machine the bush diameter for correct fit. (Note: aftermarket parts are always suspect for size.)

    Hopefully you have the original bush that you can measure to determine correct diameter. Maybe take the parts to a machine shop and let them measure up for you?.

    If you just hammer the bush in that will reduce the bore size of the bush and the part that goes into it may not fit!.

    Chris

  3. #3
    Join Date
    Apr 2019
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    Series ‘59 2.25P distributor drive gear fouling on fitment

    Thanks Chris, I’ll continue investigating and write back. Both the drive gear units I have are genuine LR out of running vehicles, I’m not fitting an aftermarket one…

    Quote Originally Posted by Busted Syncro View Post
    G'day Matt,

    My thoughts would be to use telescopes to measure the bore for the bush in the block and use a micrometer to measure the size. Then use micrometer to measure the diameter of the bush. ( Calipers are not accurate enough at +/- 0.02mm to measure fit.) This will give you the type of fit you have.

    I would not hone the bore in the block for fit as you have rightly indicated once metal is gone it's gone!.

    I would machine the bush diameter for correct fit. (Note: aftermarket parts are always suspect for size.)

    Hopefully you have the original bush that you can measure to determine correct diameter. Maybe take the parts to a machine shop and let them measure up for you?.

    If you just hammer the bush in that will reduce the bore size of the bush and the part that goes into it may not fit!.

    Chris
    Cheers, Matt

    ----------------
    1971 Series 2a 4-cyl (restored)
    1961 Series 2a 4-cyl (undergoing restoration)

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