Perkins 4008 - Maintenance Procedures (Continued); Valve Train Adjustment Procedures

MAINTENANCE PROCEDURES
44 4006/8 Diesel, May 1998
EQUALISING THE BRIDGE PIECES
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. 44).
SETTING VALVE CLEARANCES
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 (see Fig. 45). Tighten the lock nut
without moving the adjuster. 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 4006 Valves Rocking on Set Bridge Piece and Valve
T.D.C. Cylinder No. Clearance on Cylinder No.
1and6 6 1
2and5 2 5
3and4 4 3
1and6 1 6
2and5 5 2
3and4 3 4
Engine 4008 Valves Rocking on Set Bridge Piece and Valve
T.D.C. Cylinder No. Clearance on Cylinder No.
1and8 8 1
4and5 5 4
2and7 2 7
3and6 3 6
1and8 1 8
4and5 4 5
2and7 7 2
3and6 6 3
DISCONNECT
BATTERIES OR ANY
OTHER MEANS OF STARTING THE
ENGINE.
WARNING
Fig. 44
32.3
1
2
Fig. 45
33.3