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Thread: Timing Marks

  1. 19th May 2009, 04:54 PM #1
    British Bulldog
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    Timing Marks

    Hey Guys,
    Just doing the timing chain on the rangie this afternoon. Set it to TDC and pulled apart. The slack in the old chain was in incredible, almost one full link. Now that explains the occasional miss and the timing jumping all over the joint. Now I put the new one on but the timing marks are not lined up 100%. see photo



    Now should I just move the cam back a notch or just leave it. I know when I was doing the timing belts on my Subaru this would have a caused a problem being out by that much does it matter to the rover.

    thanks in advance guys
    Kris
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  2. 19th May 2009, 05:20 PM #2
    It'sNotWorthComplaining! Guest
    Did you just put a new chain on to the old sprockets or did you replace then too?
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  3. 19th May 2009, 06:14 PM #3
    British Bulldog
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    nah replaced both chain and sprockets
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  4. 19th May 2009, 07:23 PM #4
    mike 90 RR Guest
    Quote Originally Posted by British Bulldog View Post
    Hey Guys,
    Just doing the timing chain on the rangie this afternoon. Set it to TDC and pulled apart.

    Now should I just move the cam back a notch or just leave it.
    Kris ... You can't guess that it is right ... 1 tooth out, and it will run like a pig

    When you set it up on TDC .... DO NOT TRUST the harmonic balancer for being correct (As they can twist / turn on their rubber insert)

    You must also DOUBLE CHECK check via the piston being at the top of it's stroke

    Take the "number 1" spark plug out and put a thin screwdriver down the hole ... Twist the crank ...left & right to check the piston is at the top of stroke

    I have a feeling that the crank is slightly off TDC in your photo


    IF the book says LINE UP the DOTS .... Then you MUST line em up

    So in essence .... Yes ... it is a worry


    Good to see that your changing the chain and sprockets tho ... The motor will run smoother and stronger


    Mike
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  5. 19th May 2009, 07:45 PM #5
    mike 90 RR Guest
    Afterthoughts .....

    With a cam chain being so slack .... It would be normal for the dots not to be lined up when the crank is at TDC ... You do have to manipulate (turn) the crank 1 tooth back ... put the new chain on .... Turn the crank back to TDC (this will also now turn the cam) ... and check that the dots are lined up

    IF in doubt ... easier to post a after photo for us to see ... before you put the covers back on


    The other reason for Double checking the TDC via the spark plug .... is so that you will know if the harmonic balancer has not twisted and is in good condition .... otherwise you can't set the spark timing to 1 or 3 degrees (what ever your motor is suppose to be set at / Different years / different settings ... Should be written on the Left hand rocker cover on the green sticker)

    Mike
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  6. 19th May 2009, 08:00 PM #6
    Blknight.aus's Avatar
    Blknight.aus
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    the crank isnt at TDC and then your a tooth out.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  7. 20th May 2009, 08:38 AM #7
    British Bulldog
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    [img=http://img413.imageshack.us/img413/8905/p1060313.th.jpg]

    I have pulled the sprockets back off and turned the crank in the direction of the arrow then put it all back on the moved it back to TDC this should be right now shouldn't.
    Thanks for all the help mike next time your in Vic give me a yell I owe you a beer or three

    Thanks
    Kris
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  8. 20th May 2009, 09:15 AM #8
    mike 90 RR Guest
    Quote Originally Posted by British Bulldog View Post
    I have pulled the sprockets back off and turned the crank in the direction of the arrow then put it all back on the moved it back to TDC this should be right now??
    I had a look at the photo .... and it looks "Sort of lined up" .... I can't be 100% because I can still see that it is not lined up perfectly .... Could be just the way you have positioned up the crank TDC ... tho (but it looks HEAPS better than the last photo)



    Don't want to confuse the issue .... or be a PITA .... but this is what I do to confirm the true position .....

    Generally, if I am unsure ... then I just have a play with it by "Dry fitting it" 1 tooth forward ... or ... 1 tooth back ..... untill I am DEAD SURE that, that is the TDC & Dot to dot position .... when the crank is back in TDC position

    Once you see the final position of ... 1 tooth forward / 1 tooth backward ... It will be very clear to you where Dot to Dot is


    You might remember a quote .... "Better to measure twice & cut once" ...

    Mike
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  9. 20th May 2009, 03:04 PM #9
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    Blknight.aus
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    thats aligned +- the slop thats now evident on your woodruff key.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
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  10. 22nd May 2009, 09:33 AM #10
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    Tank
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    Quote Originally Posted by British Bulldog View Post
    Hey Guys,
    Just doing the timing chain on the rangie this afternoon. Set it to TDC and pulled apart. The slack in the old chain was in incredible, almost one full link. Now that explains the occasional miss and the timing jumping all over the joint. Now I put the new one on but the timing marks are not lined up 100%. see photo



    Now should I just move the cam back a notch or just leave it. I know when I was doing the timing belts on my Subaru this would have a caused a problem being out by that much does it matter to the rover.

    thanks in advance guys
    Kris
    Pull your old sprockets and chain off and bin them fit both new sprockets, the cam sprocket timing mark should be at 6 o'clock and the crank sprocket should be at 12 o'clock and perfectly aligned to one another, remove the new sprockets, without moving cam or crank, fit the chain to the sprockets with the timing marks aligned and fit to crank and cam without moving either, rotate engine till back on #1 TDC (both valves closed and rotor button in dissy aligned to fire #1) and the timing marks should still be aligned correctly, job done, Regards Frank.
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