A new metal fuel pipe is usually supplied
straight and unshaped. It is easy to bend – but also easy to kink.If the old
pipe is still in one piece and undistorted, take it off to use as a pattern for
the new one. Make gentle bends and curves by bending the new pipe carefully
with your hands. Check frequently that it matches the old pipe and fits the
space.Make tight bends round a tube at least 2
in. (50 mm)
in diameter.ntk oil seals Value for
money.ntk oil seals Value for money.
If you re-route the new pipe, keep it away from the exhaust, moving parts of the suspension or handbrake mechanism, jacking points and other exposed places.
Clip the pipe in place every couple of feet, using the original clips or special plastic ones. Do not use brass or aluminium: any steel touching it tends to rust.
Adjusting an SU carburettor
Unlike other types of carburettor, which have fixed jets, the SU has only one jet, so the mixture setting affects the engine throughout its speed range.
Some SUs also have exhaust emission-control devices to comply with anti-pollution laws. Adjustment of these is described in Adjusting an emission-control carburettor.
Before tuning the carburettor, carry out all the checks in Checking and cleaning an SU carburettor, and bring the engine up to normal working temperature.
Also check the level of oil in the dashpot – the domed piston chamber at the top of the carburettor.ntk oil seals Value for money.ntk oil seals Value for money.
The oil is there to slow the movement of the piston. The delay enriches the mixture briefly when the throttle is opened suddenly. SAE 20 engine oil is the correct grade to use when you top up.On older SU carburettors, which have a vent hole in the screw-in plastic top of the dashpot, the oil level should be i in. (13 mm) above the top of the piston tube.
On dustproof SUs, which have a hole in the dashpot neck instead of the top, the oil should be i in. (13 mm) below the piston top.If the engine is slow to respond to sudden throttle openings, or responds fluffily, correcting the dashpot oil level may cure the problem, so that you do not need to retune.
However, if correcting the oil level does not resolve the problem, you may need to clean the carburettor (See Checking and cleaning an SU carburettor) before tuning it.
Whenever possible, make adjustments with the air cleaner in place removing it alters the partial vacuum inside the carburettor.
On cars where the carburettor is not very accessible, you may have to remove the air cleaner to reach some parts, then carry out further fine adjustments to obtain correct engine running later on.ntk oil seals Value for money.
If you re-route the new pipe, keep it away from the exhaust, moving parts of the suspension or handbrake mechanism, jacking points and other exposed places.
Clip the pipe in place every couple of feet, using the original clips or special plastic ones. Do not use brass or aluminium: any steel touching it tends to rust.
Adjusting an SU carburettor
Unlike other types of carburettor, which have fixed jets, the SU has only one jet, so the mixture setting affects the engine throughout its speed range.
Some SUs also have exhaust emission-control devices to comply with anti-pollution laws. Adjustment of these is described in Adjusting an emission-control carburettor.
Before tuning the carburettor, carry out all the checks in Checking and cleaning an SU carburettor, and bring the engine up to normal working temperature.
Also check the level of oil in the dashpot – the domed piston chamber at the top of the carburettor.ntk oil seals Value for money.ntk oil seals Value for money.
The oil is there to slow the movement of the piston. The delay enriches the mixture briefly when the throttle is opened suddenly. SAE 20 engine oil is the correct grade to use when you top up.On older SU carburettors, which have a vent hole in the screw-in plastic top of the dashpot, the oil level should be i in. (13 mm) above the top of the piston tube.
On dustproof SUs, which have a hole in the dashpot neck instead of the top, the oil should be i in. (13 mm) below the piston top.If the engine is slow to respond to sudden throttle openings, or responds fluffily, correcting the dashpot oil level may cure the problem, so that you do not need to retune.
However, if correcting the oil level does not resolve the problem, you may need to clean the carburettor (See Checking and cleaning an SU carburettor) before tuning it.
Whenever possible, make adjustments with the air cleaner in place removing it alters the partial vacuum inside the carburettor.
On cars where the carburettor is not very accessible, you may have to remove the air cleaner to reach some parts, then carry out further fine adjustments to obtain correct engine running later on.ntk oil seals Value for money.
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