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Installation / Adjustment new SU HS6 to original Volvo carburetor linkage

09.11.2023

Classic Volvos with SU HS6 twin carburetors have their own type of throttle lever with an 8.2mm hole suitable for the 8mm diameter of the original Volvo throttle linkage. Differing from this, SU always delivered the carburetors with a 7,62mm hole. Since the original Volvo throttle lever is no longer available, we will show you in this manual how to adapt your new SU carbs to the original throttle linkage.


At first loosen the nut on the throttle shaft, that is holding down the choke lever and the throttle shaft stop. The nut is secured with a thin locking plate that bends away when you loosen the nut with gentle force.


Unscrew the locking screws of the throttle valve completely. Best way to do this is when the throttle valve is completely shut.
Warning: Never reuse these screws! Those crack very fast and may cause disastrous engine damage.

Remove the throttle valve in fully opened position.


Unscrew the nut that is holding down the choke lever and throttle stop. Loosen both levers with careful punches on the throttle shaft and take the levers off. Then completely drive out the throttle shaft. Only use a plastic hammer for this!


Now the throttle lever has to be separated from the throttle shaft. First drive out the locking pin.


To drive out the pin, clamp down the throttle lever in a vice in a way you can easily reach the pin with a thin punch. Never clamp the throttle shaft itself!


When the pin is removed, the throttle shaft can be driven out of the throttle lever. Lay down the throttle lever on the vice in a way, you are able to drive out the throttle shaft without damaging it.


The punch you are using must be as close to the diameter of the throttle shaft as possible and must have a smooth surface. Too small and/or worn punches will damage the shaft quickly.


Now drill out the lever to 8,2mm for the throttle linkage. Pay attention to only drill the depth needed for the linkage. If you are not able to measure the depth wile drilling, you can use the hole for the locking pin as an orientation: If you can see the tip of the drill through the hole for the locking pin, you drilled deep enough.
Never bore through the lever completely! If you do this, the throttle shaft won`t fit anaymore and the lever is ruined!

After drilling, deburr and clean the lever with compressed air.


Now drive the throttle shaft back into its seat in the lever. To protect the thread, screw a nut on the end of the shaft.
Important: Watch the Position of the holes for the locking pin, they have to align.
Also make sure the countersunk holes for the throttle valve screws face in the right direction and the throttle shaft is not twisted 180 degrees. In that case it will be impossible to turn in the throttle valve screws.


Again: Only use a plastic hammer for this process!


Make sure the bores for the locking pin align.


Hold the locking pin with thin pliers, since it`s hard to hold the little pin with your fingers. To do this, clamp the throttle lever as shown in this picture.


When the pin is positioned correctly, unclamp lever and shaft from the vice and drive in the locking pin completely.


Insert the throttle shaft back into the carburetor.


Put on the choke lever, the throttle stop and the locking plate back in the correct position.


Tighten the nut and bend over the locking plate.


Insert the throttle valve back into its seat in the shaft.


To determine the correct position for the throttle valve, it has to be shut.


Screw in the new fastening screws for the valve and tighten them.
Attention: If the valve is not shut during this it may happen, that the valve is not centered properly and the valve won`t close completely. In that case it will be impossible to adjust the idle. So check that the valve closes completely after you tightened the screws before the next step.

Now bend apart the protruding, slotted ends of the screws a bit.
Attention: It is very important to do this step, otherwise the screws may come loose and cause disastrous engine damage.

Last step before installing the new carburetors: Make sure the throttle linkage is seated properly in the throttle levers.

  • All notes serve only as an example and do not replace the workshop instructions of the automobile manufacturers! All information is supplied without guarantee!

Additional information...

  • 1037832: Carburettor SU HS6 Kit 2 Pcs
  • 1037833: Carburettor SU HS6 Kit 2 Pcs
  • 1077024: Carburettor SU HS6 Kit 2 Pcs