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Thread: Symptoms of incorrect valve clearances 300Tdi

  1. #1
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    Symptoms of incorrect valve clearances 300Tdi

    I cleaned out my intercooler and fitted a set of silicone hoses today thinking I might have had a delamination problem. Intercooler was filthy inside so it was worthwhile. Very nice whistle down the snorkel now.

    The engine still feels quite sluggish, I know it's not a rocket, but it doesn't have the willingness that my 200Tdi had. It seems like it's not breathing properly and on a few recent trips others have commented it's putting out a fair bit of black smoke. I'll agree that it does run very sooty even on a moderate throttle.

    Will the valve clearances have any bearing on this? I've not done them during my tenure (because I don't know how) and I can't comment on the PO.

  2. #2
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    If the valves aren't opening fully then they can't let enough air in so that could be one reason,a dirty air filter will do the same. Pat

  3. #3
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    are your injectors clean
    Our Land Rover does not leak oil! it just marks its territory.......




  4. #4
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    Quote Originally Posted by dullbird View Post
    are your injectors clean
    I replied to this in detail but the system load problem lost my reply. Should have known to backup my text.

    I was saying:

    I think the injectors are clean. If not I put 70 litres of injector cleaner in this morning (that is not a typo).

    Fuel side: new filters, no air leaks, besides judging by the smoke I know its not a fuel supply issue

    Air side: new filter, new silicone hoses, intercooler spotless, no turbocharger problems (EC tbh, no axial or radial play) no blockages/rubbish down the snorkel.

  5. #5
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    I've decided, bugger it, this too easy so I'll do it myself on Friday. I'll probably work as per the RAVE instructions, but can't you just turn the crankshaft until the valves aren't rocking for any given piston and then adjust both inlet and exhaust in one hit? Seems easier than guessing when valves are fully open.

  6. #6
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    Just go by the workshop manual.Trust me the hardest thing about the job is not skinning your knuckles turning the crank. Pat

  7. #7
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    Quote Originally Posted by PAT303 View Post
    Just go by the workshop manual.Trust me the hardest thing about the job is not skinning your knuckles turning the crank. Pat
    Cheers.

    Not sure how the access is on a Defender, but on the Disco it's probably easier to turn it on the alternator pulley bolt

  8. #8
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    You might be lucky,my defender didn't want to know about it. Pat

  9. #9
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    Jul 2007
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    Melbourne, VIC
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    I normally just lift one front wheel and put the gearbox in fourth or fifth and turn that.

    It's a pain getting to the crank on a defender with all hoses/belts/shrowds connected up.

  10. #10
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    Quote Originally Posted by B92 8NW View Post
    Cheers.

    Not sure how the access is on a Defender, but on the Disco it's probably easier to turn it on the alternator pulley bolt
    To make it easier to rotate remove the glow plugs, get a friend to rotate the crank from underneath with a socket and ratchet, follow the directions in the LR workshop manual and check your settings again before starting, Regards Frank.

    VALVE CLEARANCES - ADJUST
    CAUTION: To prevent possibility of
    damage to cam follower seatings, it is
    essential that ball ends of tappet adjusting
    screws are seated in recess in push rods and
    that ball end of each push rod is correctly
    located in cam follower slide.
    1.
    Rotate crankshaft by means of crankshaft
    pulley bolt in a clockwise direction until number
    8 valve ( counting from front of engine ) is fully
    open.

    2.
    Using feeler gauges and a screwdriver, adjust
    clearance of number 1 valve.
    Valve clearance - all valves = 0.20 mm

    3.
    Tighten tappet adjusting screw locknut when
    clearance is correct.

    4.
    Adjust the remaining valve clearances in the
    following sequence:
    Adjust number 3 clearance with number 6
    valve fully open
    Adjust number 5 clearance with number 4
    valve fully open
    Adjust number 2 clearance with number 7
    valve fully open
    Adjust number 8 clearance with number 1
    valve fully open
    Adjust number 6 clearance with number 3
    valve fully open
    Adjust number 4 clearance with number 5
    valve fully open
    Adjust number 7 clearance with number 2
    valve fully open

    5.
    Upon completion, re-check all clearances and

    adjust as necessary.
    What Goes Around, Comes Around.
    94 Disco 300TDi Auto, with the Lot
    93 Disco with the lot, Gone
    78 Series III 109, Diesel.
    Toyota BJ 40, Gone
    Ford Bronco WOW, Gone
    Toyota 4Runner RIP
    F100 4WD, Unbelievable, Gone
    Suzuki Brilliant, Gone

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