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Thread: TB42 Tappet Adjustment

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    TB42 Tappet Adjustment

    This is a widely ask question by many DIYers so I've set it out in point form so whom ever needs it may copy & print it out for future use.


    TB42 Tappet adjustment.

    Adjusting Intake and Exhaust Valve Clearance
    Adjustment should be made while engine is warm but not running

    1. Set No. 1 cylinder at top dead centre on its compression stroke,(with timing marks aligned remove distributor cap the rotor button should be pointing at number 1 ignition lead position in reference to the distributor cap if its not rotate engine 360 degrease) and adjust valve clearances 1,2,3,6,7,10

    2. Set No. 6 cylinder at top dead centre on its compression stroke, (with timing marks aligned remove distributor cap the rotor button should be pointing at number 6 ignition lead position in reference to the distributor cap if its not rotate engine 360 degrease) and adjust valve clearances 4,5,8,9,11,12

    Valve clearance
    Intake 1,3,5,7,9,11 - 0.38mm (0.015 in)
    Exhaust 2,4,6,8,10,12 - 0.38mm (0.015 in)

    Adjusting screw lock nuts - 16 - 22 Nm (1.6 - 2.2 kg/m, 12 - 16 ft/lb)

    If you are running duel fuel it is a good idea to set your tappets 1 to 2 thou bigger in gap as LPG has a tendency to close up the gap.

    Although this is a widely used practice its not an absolute necessity.

    Cheers
    Paul
    Last edited by patch697; 15th August 2010 at 11:53 AM.

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    Good info, cheers Pauly.

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    The proceedure for TD42 is exactly the same, but you wont be able to check the rotar button postion to confirm whether it's 1 or 6 on TDC. Easy way to tell is set crank to TDC by timing marks, if both rockers on No. 1 are rocking then No. 1 is on TDC. Like wise No. 6. I'm not sure of valve clearance for TD42 but from memory I think it's .0014 in.

    Tony

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    and 3.3 turbo whats the go there please guys?

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    Quote Originally Posted by patch697 View Post
    This is a widely ask question by many DIYers so I've set it out in point form so whom ever needs it may copy & print it out for future use.


    TB42 Tappet adjustment.

    Adjusting Intake and Exhaust Valve Clearance
    Adjustment should be made while engine is warm but not running

    1. Set No. 1 cylinder at top dead centre on its compression stroke,(with timing marks aligned remove distributor cap the rotor button should be pointing at number 1 ignition lead position in reference to the distributor cap if its not rotate engine 360 degrease) and adjust valve clearances 1,2,3,6,7,10

    2. Set No. 6 cylinder at top dead centre on its compression stroke, (with timing marks aligned remove distributor cap the rotor button should be pointing at number 6 ignition lead position in reference to the distributor cap if its not rotate engine 360 degrease) and adjust valve clearances 4,5,8,9,11,12

    Valve clearance
    Intake 1,3,5,7,9,11 - 0.38mm (0.015 in)
    Exhaust 2,4,6,8,10,12 - 0.38mm (0.015 in)

    Adjusting screw lock nuts - 16 - 22 Nm (1.6 - 2.2 kg/m, 12 - 16 ft/lb)

    If you are running duel fuel it is a good idea to set your tappets 1 to 2 thou bigger in gap as LPG has a tendency to close up the gap.

    Although this is a widely used practice its not an absolute necessity.

    Cheers
    Paul
    another one for the file as it can be for any thing that needs index

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    Thanks paul very handy to have as I will be doing this soon cheers

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    Quote Originally Posted by Russell1974 View Post
    Thanks paul very handy to have as I will be doing this soon cheers
    What you running Russ TB or TD?

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    Quote Originally Posted by patch697 View Post
    What you running Russ TB or TD?
    I have the 4.2 turbo diesel

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    Hi everyone,
    That is a very good write-up on tappet adjustments Paul, very specific. I particularly liked the mention of visually looking at the rotor to indicate TDC firing. I did not use that method in my writings. I would like to offer another view if I may. I have written an article myself on my website which explains three methods of adjusting tappets that is tranferrable to almost any engine. Hopefully this link www.tuning.mbs.id.au/TechTalk/TT2.htm will take you directly to the article without going through my site, but if it doesn't please go to www.tuning.mbs.id.au Click on the Tech Talk menu on the left & then click on the TT2 button. Hope it is useful to you.
    Chhers
    Mike

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    Someone will tell me where to find cheap valves and valve lifters? I did the disassembly and are nearly all destroyed ....

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