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Thread: Td5 Injector bump adjustment

  1. #1
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    Td5 Injector bump adjustment

    I recently adjusted the bump clearance on the Td5 injectors and located the lobe peak by eye. I've been a bit uncertain about the accuracy of this method and had considered picking up a DTI so I could do it accurately.

    I had noticed the markings on the end of the camshaft at the sprocket end which consists of a line and a number and was curious as to what this was for.

    Yesterday I discovered a post on another forum which answered both questions.

    Apparently if you line up the mark with the edge of the camshaft carrier this corresponds with the peak of the injector lobe. It's not documented in RAVE as far as I can see so wondered if anyone had come across this before. If it's correct it would make the injector adjustment much easier to do consistently.

    cheers
    Paul

  2. #2
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    I have not noticed any markings, but never looked for them. Can you post the link to the forum that explains this?

    Finding the peak by eye was not that much of a problem for me. I think it is not that important to find the exact spot with great accuracy.

  3. #3
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    Thought it would be harder to refind than it was....

    Injector Timing Marks - Land Rover Zone

    There is a pic of the mark and the alignment with the cam carrier 2/3's down the page.

    The D2 version of rave doesn't mention these marks, but they are definitely there. I noticed them I was doing the head on my engine.

    It should make the bump adjustment more accurate and repeatable than doing by eye.

    cheers
    Paul

  4. #4
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    Good find Paul! It is fortunate that the cam lobes etc are 'easy' to see or it would be damn near impossible to do this adjustment. Over the years I have reverted to 'old school' lift by eye measurements, so far so good

    I'll certainly take this on board as a method as my eyesight deteriates

    JC
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
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  5. #5
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    Found this on fixya of all places:

    Fuel injectors on TD5 are adjustable.Turn the engine over while noting the camshaft position.There are marks behind the cam chain sprocket 1 - 5.With each line next to the number set in the middle of the cam box hole. Adjust the injector stop screw fully in (clockwise),turn the stop screw one full turn out 360 degrees and lock the nut there.Do this with all the injectors in turn with the injector coinciding with the number on the cam shaft.
    So this is advocating a slightly different method. The landy zone post says to align with the edge of the casting so there is a slight difference:



    Still haven't been able to find anything in RAVE that mentions these marks in relation to injector adjustment.

    cheers
    Paul
    Attached Images Attached Images

  6. #6
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    Quote Originally Posted by OffTrack View Post
    Found this on fixya of all places:



    So this is advocating a slightly different method. The landy zone post says to align with the edge of the casting so there is a slight difference:



    Still haven't been able to find anything in RAVE that mentions these marks in relation to injector adjustment.

    cheers
    Paul
    Sorry to bring this post back from the dead, but I thought it wise to clarify the point. I originally posted this method on Landyzone. The correct position for the cam marks, is to line the mark with the nib of the cam carrier, as in the above image. This was verified with a DTI gauge, prior to posting. If you try and align the cam marks with the centre of the timing hole, a - you cannot see the marks and b - the injector cam lobe is not at full height. Wind the injector screw in until you just feel it start to tighten up (ie start to bottom out. DO NOT KILL IT!!!. If you nip the screw right up, the bump setting will be out, as the injector made contact with the bottom 1/4 of a turn earlier.

    I hope this prevents someone wrecking their injectors.

    Cheers

  7. #7
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    That makes sense, to align with the nib of the carrier so the number is visible.
    Just to confirm,do you only screw the adjustment screw in until it starts to tighten, then lock it.So no need to loosen off one turn?

  8. #8
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    I just did this tonight and couldn't find any markings at all.

    Did it by eye on lobe but would have preferred by the marks.

    I also couldn't screw the crank locking tool in as the hole was only half visible (closer to the engine) but it lined up with cam locked off up top.

  9. #9
    discorevy is offline ChatterBox Silver Subscriber
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    Quote Originally Posted by johnp38 View Post

    I also couldn't screw the crank locking tool in as the hole was only half visible (closer to the engine) but it lined up with cam locked off up top.
    That would indicate the cam timing is well out as the crank tool needs to align with a slot , not a hole ( the holes are for the crank angle sensor) when the cam tool is in place.

  10. #10
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    Ok so I am looking to see a slot in the flywheel similar to the slot in the cam?

    Almost tempted to get back out there again tonight.

    Thanks for the heads up, much appreciated.

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