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Group 21 Engine Body
122
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Camshafts and Camshaft Bushings
Measure cam lift
Use a micrometer to measure the diameters of "A"
and "B" on each cam to determine the reduction in
cam lift. If the cam lift is less than the service limit, re-
place the camshaft.
Cam lift (A-B), mm [in]
Assembly standard ... 9.197–9.297 [0.36209–0.36602]
Service limit .............. 8.45 [0.3327]
Measuring camshaft deflection
If the deflection exceeds the repair limit, straighten
the camshaft with a press, or replace it with a new
one.
IMPORTANT! Set up a dial gauge on the cam-
shaft, then turn the camshaft. Take one-half of
the gauge indication as the deflection.
Camshaft deflection, mm [in]
Assembly standard ... 0.05 [0.0020] max
Repair limit ................ 0.08 [0.0031]
Measuring camshaft journal diameters
Use a micrometer to measure each camshaft journal
in two directions at right angles to each other. If the
diameter exceeds the service limit, replace the cam-
shaft.
Camshaft journal diameter, mm [in]
Nominal value ........... Ø84 [3.31]
Assembly standard ... 83.92–83.94 [3.3039–3.3047]
Service standard ....... 83.87 [3.3020]
Measuring camshaft bushing inside diameter
Use a cylinder gauge to measure the inside diameter
of the camshaft bushings fitted to the crankcase. If
the inside diameter exceeds the service limit, replace
the bushings.
Camshaft bushing inside diameter, mm [in]
Nominal value ........... Ø84 [3.31]
Assembly standard ... 84.000–84.035 [3.30708 –3.30846]
Service limit .............. 84.10 [3.3110]
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