WEICHAI WD10 Service Manual - page 90
Service Manual for WD10 Diesel Engine
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4532 Steps to Disassemble Rocker and Rocker Shaft
(1) Rotate crankshaft to check whether rocker is flexible.
(2) Measure each valve clearance, and check the change of valve clearance.
(3) If the rocker is not flexible or too big valve clearance, loosen hexagon nut and then take down
the supporting arm, rocker shaft, intake and exhaust rocker assembly, mark them to prevent
confusion.
4533 Inspection and Maintenance of Rocker and Rocker Shaft
(1) Clean up the rocker and check its appearance for crack.
(2) Check rocker inner hole for abrasion and scratch, and measure its diameter.
(3) Check the ball pin and rocker other end arc surface for abrasion.
(4) Check whether all oil galleries are smooth.
(5) Measure diameter of rocker inner hole and rocker shaft, and ensure the fit clearance meets the
requirements:
Model
Check items
Standard value
Measured value
WP10
Diameter
of
rocker
inner hole
φ23.972~φ23.993
Diameter
of
rocker
shaft
φ23.927~φ23.960
4534 Steps to Assemble Rocker and Rocker Shaft
(1) Apply a small amount of lubricating oil on valve rocker seat and then fit intake and exhaust
valve assembly on rocker seat. Loose-fit the hexagon bolts, ensure proper clearance between
rocker and rocker seat so that the rocker can rotate flexible;
(2) For the last assembling step of EVB rocker, firstly place supporting arm on rocker seat and then
loose-fit hexagon bolts and EVB adjusting bolt assembly, tighten the supporting arm;
(3) After the assembling, rotate crankshaft to check whether rocker is flexible.
(4) Check and adjust intake and exhaust valve clearance
1) Rotate the engine until cylinder 1 reach its TDC, at this point flywheel mark should be
aligned to flywheel housing mark, make sure cylinder 1 is in compression stroke.
2) Adjust intake valve clearance of No. 1, 2, 4 cylinder and exhaust valve clearance of No. 1,
3, 5 cylinder, required intake valve clearance is 0.3±0.03mm, while that for exhaust valve
is 0.4±0.03mm, and EVB valve clearance should be 0.25±0.03mm. Tightening torque of
intake and exhaust valve adjusting nut is 30~40Nm. Methods to adjust intake and exhaust