Service Manual for WP6 Diesel Engine
68
3534 Steps to Assemble Rocker and Rocker Shaft
(1) Check whether all to-be assembled pars are clean, free of bump damage, scratch and rust;
(2) Install rocker adjusting screw and lock nut, the screw should be fully screwed in, while the lock
nut only needs to be screwed in for 2~3 thread pitches;
(3) Apply lubricating oil on rocker seat and rocker inner hole, and install butterfly spring washer,
rocker assembly, the other butterfly spring washer and circlip for shaft on rocker seat;
(4) Loose-fit rocker seat on cylinder cover with hexagon bolts;
(5) Install valve pushrod, refer to assembly of valve pushrod for details;
(6) Pre-tighten rocker seat, align rocker adjusting screw socket head to valve pushrod round head,
tighten the hexagon bolts to 40~45Nm.
Check and adjust intake and exhaust valve clearance
(1) Rotate the crankshaft until phase pointer points at 0 tick on phase plate, observe and make sure
0 tick of crankshaft timing gear is engaged with 0 tick of camshaft gear. Then adjust valve
clearance of No. 1-2-3-6-7-10 rocker (count from the front end), intake valve adjustment: firstly
fill in a 0.2mm plug gauge, and tighten the nuts with torque spanner to 20±5 Nm, pull out the
gauge (make sure the gauge can be easily pulled out), and check the clearance with a 0.25mm
plug gauge (make sure the gauge cannot get through), adjusting of intake valve is finished.
Exhaust valve adjustment: firstly fill in a 0.3mm plug gauge, and tighten the nuts with torque
spanner to 20±5 Nm, pull out the gauge (make sure the gauge can be easily pulled out), and
check the clearance with a 0.35mm plug gauge (make sure the gauge cannot get through),
adjusting of exhaust valve is finished.
(2) Further rotate crankshaft until phase pointer points at 0 tick on phase plate, observe and make
sure 0 tick of crankshaft timing gear is engaged with the symmetry point of 0 tick (180
o
) on
camshaft gear. Then adjust valve clearance of No. 4-5-8-9-11-12 rocker (count from the front
end), refer to (1) for adjusting method.
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