Perkins 4012TESI Series User Handbook Manual page 44

MAINTENANCE PROCEDURES
EQUALISING THE BRIDGE PIECES
WARNING
OTHER MEANS OF STARTING THE
ENGINE.
Having rotated the engine to the correct
position, check that the inlet and exhaust
rockers have clearance before continuing
with the next operation. Loosen the lock nut
(1) on each bridge piece, screw the adjuster
(2) out until the fixed side of the bridge piece
rests on its valve, hold the top edge down
with one hand then screw the adjuster down
until you feel it touch the valve, thereby
equalising valve lift. Tighten the lock nut
without moving the adjuster (see Fig. 32).
SETTING VALVE CLEARANCE
With both bridge pieces equalised check the
valve clearance of 0.4 mm (0.016") inlet and
exhaust using a feeler gauge (1). If adjustment
is required loosen the lock nut (2) and using
the adjuster screw (3) set the clearance.
Tighten the lock nut without moving the
adjuster (see Fig. 33). The feeler gauge
should be a slide fit between the rocker and
bridge piece thereby giving the correct
clearance. Refit the rocker cover with a new
gasket.
ENGINE 4012TESI
T.D.C.
A1 & A6
B1 & B6
A2 & A5
B2 & B5
A3 & A4
B3 & B4
A1 & A6
B1 & B6
A2 & A5
B2 & B5
A3 & A4
B3 & B4
40
DISCONNECT
BATTERIES OR ANY
VALVES ROCKING ON
CYLINDER NO.
2
1
Fig. 32
3
Fig. 33
AND VALVE CLEARANCE
A6
B1
A2
B5
A4
B3
A1
B6
A5
B2
A3
B4
2
SET BRIDGE PIECE
ON CYLINDER NO.
A1
B6
A5
B2
A3
B4
A6
B1
A2
B5
A4
B3
4012/16 Gas, February 1998
1