Mitsubishi S4Q, User Manual

Page: 21 / 174

21 / 174 Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
CYLINDER HEADS AND VALVE
MECHANISM
ENGLISH
ENGINE MAIN PARTS
7.1.1 Removing rocker shaft assembly
1) Loosen the adjusting screw one turn.
2) Loosen the bolts, long and short, that hold the
rocker shaft bracket to the cylinder head. Be
sure to loosen the short bolt first. Remove the
rocker shaft assembly from the cylinder head.
7.1.2 Disassembling rocker shaft
assembly
Arrange the disassembled rockers in the order
removed, so you can install them in that order at
reassembly. This will ensure the same rockershaft
clearance as before.
7.1.3 Removing cylinder head
Remove the cylinder head bolts. Lift the head off
the crankcase.
7.1.4 Removing valves and valve springs
Use valve spring pusher (30691-04500) to
compress the valve spring squarely, then remove
the valve cotters.
Figure 8 Removing rocker shaft assembly
CAUTION
If the long bolt is loosened first, the rocker shaft
bracket might suffer damage.
Figure 9 Disassembling rocker shaft assembly
Figure 10 Removing cylinder head
NOTE
If any parts of the cylinder head are faulty, check the
cylinder head bolts for torque with a torque wrench
before removing them.
Figure 11 Removing valves and valve springs
Valve
spring
pusher
NOTE
If the existing valves are to be reused, put a mark on
each valve for its location.