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Maintenance
Twist off the plugs that close the vacuum tubes. The
number of the cylinder to which the rubber plug is con-
nected is written on the plug itself (A).
The vacuum tubes are located on the right and left side
B
of the vehicle.
Left side: Cylinders 1 and 2
Right side: Cylinders 3 and 4
Connect the measuring device with the rubber pipes.
Each pipe must match the cylinder to which it is con-
nected.
Fit in the Starter key and start the vehicle.
All bypass adjusting screws (1) must first be opened by
turning them 1.5 turns off the 'all closed' position.
For this adjustment, it is compulsory to begin with cylin-
der 2 to make sure the EBS valve will work properly.
Cylinder 2 provides the following positions:
min. 0.5 revs – max 3.5 revs
Select the position that offers the best alignment with
the other cylinders.
After finding the right position for cylinder 2, adjust it by
turning the bypass screws of cylinders 1, 3 and 4 until
the vacuums inside the four induction manifolds are
aligned. The mercury columns must have the same
height (see Figure on the side).
Cylinders 1, 3 and 4 too provide the following positions.
min. 0.5 revs – max 3.5 revs
When idling, the revs of the engine must range
between 1100 revs/min and 1200 revs/min.
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