5. Inspection and Servicing of Basic Engine Parts
118
5.6.2 Tappets
(1) The tappets are offset to rotate during
operation and thereby prevent uneven
wearing. Check the contact of each tappet
and replace if excessively or unevenly worn.
NOTE:
When removing tappets, be sure to keep them
separate for each cylinder and intake/exhaust valve.
(2) Measure the outer diameter of the tappet,
and replace if worn beyond the limit.
(3) Measuring push rods.
Measure the length and bending of the push rods.
mm
Standard
Limit
Tappet stem
outside dia.
11.975-11.990
11.930
Tappet guide
hole inside dia.
(cylinder block)
12.000-12.018
12.045
Oil clearance
0.010-0.043
0.090
mm
Standard
Limit
Push rod length
178.25-178.75
-
Push rod bend
Less than 0.03
0.03
Push rod dia.
8.5
-
Abnormal contact
surface
Normal contact
surface
(Tappet)
(Tappet stem outside diameter measurement)
(Push rod bend)
Thickness gage
