Service manual

ENGINE MEASUREMENTS
Page C-3
Engine Shop Rebuild and Parts Manual
Wrist Pin
(See Fig. C-5 “Piston, Wrist Pin and Connecting Rod” on page C-6)
A. Measure wrist pin outside diameter at three (3) posi-
tions (DIMENSIONS E, F AND G), in two (2) places
each, 90° apart.
Connecting Rod
(See Fig. C-5 “Piston, Wrist Pin and Connecting Rod” on page C-6)
Do not measure connecting rod wrist
pin bore at oil hole, measure at each
end of bore. Do not measure crankshaft journal at rod cap joint.
A. Measure connecting rod pin bore (DIMENSION J) at
each end, in two (2) places each, 90° apart.
B. Tighten the rod cap bolts to specified torque, and
measure the crankshaft journal (DIMENSION K) in
two (2) places, 120° apart, as shown.
Cylinder Head Cam and Rocker Shaft Bores
(See Fig. C-7 “Cylinder Head Cam and Camshaft” on page C-8)
(See Fig. C-10 “Rocker Shaft, Arms, and Bearing Bores” on page C-11)
A. Measure the camshaft bores at four (4) positions
(DIMENSIONS A, B, C, and D), in two (2) places
each, 90° apart.
B. Measure the rocker shaft bores (DIMENSIONS E
AND F) in two (2) places each, 90° apart.
Valve Guides and Seats
(See Fig. C-8 “Valve Guides and Seats” on page C-9)x
It is recommended that the cylinder head be
carefully inspected before removing the valve
guides. If other parts in the head show excessive wear, it may
be more cost effective to replace the entire head than to
replace parts. If the valve guides are to be replaced, the valve
seats must be resurfaced with an appropriate cutter. A total dif-
ference of 1
°between the finish angles of the valve and valve
seat is desirable.
A. Measure the inside diameter at each end of the valve
guides (DIMENSIONS A AND B), in two (2) places
each, 90° apart. If a valve guide is worn beyond ser-
vice limits, it may be removed with a mechanical
press. See NOTE above.
B. Measure angle (DIMENSION C) and width (DIMEN-
SION D) of the valve seat contact surface. If valve
seats are worn beyond service limits, they may be
resurfaced with an appropriate cutter.
Valves and Valve Springs
(See Fig. C-8 “Valve Guides and Seats” on page C-9)x
A. Measure the valve stem at three (3) positions
(DIMENSIONS A, B, and C), in two (2) places each,
90° apart.
B. Measure angle (D) and widths (DIMENSION E AND
F) of the valve face.
C. Measure valve spring free length (DIMENSION G).
Camshaft
(See Fig. C-7 “Cylinder Head Cam and Camshaft” on page C-8)
A. Measure the camshaft diameter at four (4) positions
(DIMENSIONS A, B, G, AND H), in two (2) places
each.
B. Measure the height of all four cam lobes (DIMEN-
SIONS C, D, E AND F).
Rocker Shaft and Rocker Arms
(See Fig. C-10 “Rocker Shaft, Arms, and Bearing Bores” on page C-11)
A. Measure the rocker arm shaft bore in two (2) places,
90° apart, at each end of the bore (DIMENSION A).
B. At positions along its length, including the rocker arm
contacts, measure the outside diameter of the rocker
shaft (DIMENSIONS B AND J) in two (2) places, 90°
apart.
C. Replace shaft if there are any signs of wear or abra-
sion.
Piston Ring Gap
(See Fig. C-11 “Piston Ring Gap” on page C-12)
A. Place the compression (top) ring in the cylinder bore
as shown.
B. Use an inverted piston to push the ring approximately
one inch into the cylinder; make sure the ring is flat
against its top before withdrawing the piston. This will
leave the ring at 90° to the axis of the cylinder.
C. Use a feeler gauge to measure the ring gap as
shown.
D. Measure each of the remaining rings in the same
manner.
Torque Specifications (Wet)
(See Fig. C-12 “Torque Specifications” on page C-13)
The torque table provided on Page 5 specifies
“lubricated” torque figures. Fasteners that are
plated or are lubricated when installed are considered “wet” and
require approximately 80% of the torque required for “dry” fas-
teners.