All pre-electronic MG engines
are easy to tune and hold no great mysteries, so are easy for owners
who want to do their own maintenance to tackle if they go about it
methodically and in the right sequence.rubber auto oil seals Land Rover.
Generally, if you give your car a thorough tune-up when you buy it, and then tune your car at regular intervals thereafter you will find that you need only to sort the ignition (replace spark plugs, points, condenser and set the ignition timing) and then check the carburettor settings (which usually don’t change by much if at all).
The following comments provide an overview to tuning, with more detailed comments on various aspects covered on other pages.rubber auto oil seals Land Rover.
The vital golden rules:
If you have a problem, do one thing at a time – that way you get to understand what has happened, and more importantly can undo any step which had a perverse effect.
Do the ignition first. I cannot repeat this enough!
Contrary to popular myth, any problem will NOT usually be with the carburettors! (This rule is also known as “Before touching the carburettors, make sure everything else is right first.”)rubber auto oil seals Land Rover.
The initial thorough tune-up:
By thorough tune-up, I mean that before undertaking the usual checks for ignition and carbs you ensure the following are all in good condition:
Distributor – should advance at the correct rate and should not be excessively sloppy in the bearings or drive. Distributor cap and rotor should be in good order.rubber auto oil seals Land Rover.
The cylinders are holding pressure – no significant leakage in the valves or rings – see compression testing, below.
Carburettors – should not be floppy in the throttle spindles and should not be worn significantly in the jets or jet needles. The needle valves should shut off properly and the float should be at the right position when it does so.
It is impossible to properly tune an engine properly which has faults in any of these areas. If any are present, expect only limited results until they are addressed.rubber auto oil seals Land Rover.
Having checked these items, you then need to also check:
The spark plug leads. If in doubt, replace them.
The tappets are set correctly
There are no air leaks into the intake system. A quick visual check is all that is needed initially. However, remember this as a potential cause of puzzling problems.rubber auto oil seals Land Rover.
Generally, if you give your car a thorough tune-up when you buy it, and then tune your car at regular intervals thereafter you will find that you need only to sort the ignition (replace spark plugs, points, condenser and set the ignition timing) and then check the carburettor settings (which usually don’t change by much if at all).
The following comments provide an overview to tuning, with more detailed comments on various aspects covered on other pages.rubber auto oil seals Land Rover.
The vital golden rules:
If you have a problem, do one thing at a time – that way you get to understand what has happened, and more importantly can undo any step which had a perverse effect.
Do the ignition first. I cannot repeat this enough!
Contrary to popular myth, any problem will NOT usually be with the carburettors! (This rule is also known as “Before touching the carburettors, make sure everything else is right first.”)rubber auto oil seals Land Rover.
The initial thorough tune-up:
By thorough tune-up, I mean that before undertaking the usual checks for ignition and carbs you ensure the following are all in good condition:
Distributor – should advance at the correct rate and should not be excessively sloppy in the bearings or drive. Distributor cap and rotor should be in good order.rubber auto oil seals Land Rover.
The cylinders are holding pressure – no significant leakage in the valves or rings – see compression testing, below.
Carburettors – should not be floppy in the throttle spindles and should not be worn significantly in the jets or jet needles. The needle valves should shut off properly and the float should be at the right position when it does so.
It is impossible to properly tune an engine properly which has faults in any of these areas. If any are present, expect only limited results until they are addressed.rubber auto oil seals Land Rover.
Having checked these items, you then need to also check:
The spark plug leads. If in doubt, replace them.
The tappets are set correctly
There are no air leaks into the intake system. A quick visual check is all that is needed initially. However, remember this as a potential cause of puzzling problems.rubber auto oil seals Land Rover.
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