(e) Remove the caps and measure the Piastigage at its
widest point.
Standard clearance: 0.01 – 0.05 mm
(0.0004 – 0.0020 in.)
Maximum clearance: 0.1 mm (0.004 in.)
!f clearance is greater than maximum, replace the
cylinder head and/or camshaft.
(f) Clean out the pieces of Plastigage from the bearing
and journal.
16. INSPECT ROCKER ARMS
Check the clearance between the rocker arms and
shaft by moving the rocker arms as shown. Little or no
movement should be felt.
If movement is felt, disassemble the rocker arm as–
sembly and measure the oil clearance as follows:
(a) Disassemble rocker arm assembly.
• Remove the three screws.
• Slide the rocker stands, spring and rocker arms
off the shafts.
(b) Using a dial indicator or telescoping gauge, measure
the inside diameter of the rocker arm.
Standard inside diameter: 16.000 – 16.018 mm.
(0.6299 – 0.6306 in.)
(c) Using a micrometer, measure the outside diameter of
the shaft.
Standard diameter: 15.97 –15.99 mm
(0.6287 – 0.6295 in.)
(d) Subtract the shaft diameter measurement from the
rocker arm diameter measurement.
Standard oil clearance: 0.01 – 0.05 mm
(0.0004 – 0.0020 in.)
Maximum oil clearance: 0.08 mm (0.0031 in.)
If the oil clearance is grater than maximum, replace
the rocker arm and/or shaft.
(e) Assemble the rocker arm assembly as shown, and
install the three screws.
HINT: All rocker arms are the same but all rocker
stands are different and must be assembled in the
correct order.
–ENGINE ENGINE MECHANICAL
EG1–29
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