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Thread: giving a 2.25 petrol a tune up

  1. 19th January 2009, 02:19 PM #1
    series3's Avatar
    series3
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    giving a 2.25 petrol a tune up

    I couldn't find a previous thread to this effect, but i have a bit of a long trip planned in my SWB series 3 soon. After getting the car in a great tune, I have noticed the gradual 'untuning' of the motor over time. I am keen to get it running whisper-quiet like it once did, and make sure it is as good as possible before I head off out west.

    Could someone outline the procedure for me (in mechanical layman's terms): what i need, what i need to do, or point me in the direction of an already-existing thread?

    Thanks in advance anybody
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  2. 19th January 2009, 02:31 PM #2
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    isuzurover
    isuzurover is offline Swaggie
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    Adjust valve gaps to 0.010" (warm)
    Check spark plugs and gaps
    Check dizzy and rotor
    Check/adjust points gap (to whatever the manual says...)
    Check vacuum advance works
    Check/adjust timing (given but feel free to try other settings than the factory one to see what works best for your CR/fuel combo.

    (can't remember the specs as I haven't owned one for a while...)
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  3. 19th January 2009, 04:16 PM #3
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    series3
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    Cheers isuzurover,

    Does the valve gap adjustments need a special tool?
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  4. 19th January 2009, 04:36 PM #4
    PAT303
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    Do what I did and get 125thou skimmed off the head to get more compression.They go alot better then.Has the dizzy got the fine timing adjuster on the side of it?.Wind it to zero,set the timing and then set it with the adjuster,does the engine run with the fuel set screw wound in?,internal leaks are quite common.I would do all the settings that isuzurover mentioned then do a final tune. Pat
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  5. 19th January 2009, 07:19 PM #5
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    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
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    go with that...

    Personally I set the vavles cold, do the rest take it for a short drive and then recheck a couple of the valves.
    Dave

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

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  6. 19th January 2009, 09:12 PM #6
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    JDNSW
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    As above. Only special tool needed is feeler gauges. Unless they are fairly new, I would replace the high tension leads.

    If there is a problem setting the idling mixture, this isa strong indication of carburetter problems. The most likely problem is leakage at the gasket between the top cover and body parts of the body due to warping of the top cover. This can be remedied by removing everything from the top cover and lapping it flat using fine wet and dry on a plate glass sheet (used as the most readily available accurately flat surface). Ensure that the O-ring is fitted correctly as well. A worn throttle spindle can also cause problems, as can leaky manifold gaskets.

    John
    John

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    1970 2a 109 2.25 petrol
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