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Group 21 Engine Body
86
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Bridge-to-rotator clearance
1. When clearance is less than 1.5 mm [0.059 in.],
check the valve stem top for cupping. If the stem
top is badly cupped, replace the valve to obtain
more than 1.5 mm [0.059 in.] clearance.
2. Check the condition of the bridge cap. Replace it
if it is badly worn.
Tappets and Push Rods
Inspecting cam contact faces of tappets
Replace the tappets if their cam contact faces are ab-
normally worn.
Measuring valve pushrod deflection
If the deflection exceeds the assembly standard, re-
place the push rods.
Push rod deflection, mm [in.]
Assembly standard ... Less than 0.5 [0.020] max.
Cylinder Head
Measuring head gasket flatness of surface
Use a straight edge and feeler gauges to measure
warping on each cylinder head. If warping exceeds
the repair limit, reface the gasket surface with a sur-
face grinder.
Flatness, mm [in.]
Assembly standard ... <0.03 [0.0012]
Repair limit ................ 0.07 [0.0028]
Service limit .............. 0.50 [0.0197]
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