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REPAIR INSTRUCTIONS
2. Align the timing marks. First look at the
timing marks on both the camshaft and
crankshaft gears. Note that two teeth are
marked (side-by-side) on each gear. These
two timing marks must align with the single
timing marks on the idler gear. When
properly installed, the two single timing
marks on the idler gear will fall between the
two timing marks on the camshaft and
crankshaft gears. To attain correct
alignment, rotate the crankshaft and
camshaft gears until the camshaft timing
marks are in approximately the 3:30
position, and the crankshaft gear timing
marks are in approximately the 1 o’clock
position (with engine in upright position and
viewed from the front).
There are 45 gear teeth on the crankshaft gear,
90 teeth on the camshaft gear and 48 on the idler
gear. Because the idler gear has 3 more teeth
than the crankshaft gear, the timing marks align
only once every 16 revolutions of the crankshaft.
This is called a “hunting tooth” system.
3. Slide the idler gear onto the hub assembly
with timing marks facing out.
4. Position idler gear timing marks so they align
with the crankshaft and camshaft gear
timing marks. Then slide the idler gear/hub
assembly into position on the engine block.
5. Oil the bolts with clean engine oil. Start bolts
a few turns.
6. Tap the hub portion of the assembly with a
brass hammer to seat components.
7. Tighten the bolts evenly to specification. Do
not use an impact wrench or other air tool to
tighten bolts.
Final Assembly
Complete the reassembly of the engine by
installing the front cover, seals, oil pan, push
rods, rocker shaft assemblies, engine brake
assemblies (if equipped), valve covers, other
engine accessories/drives, radiator, hood and
fender assembly, etc.
Once the engine reassembly has been
accomplished, follow the procedures under
Engine Setup and Adjustments, and Final
Preparation and Operational Check in the
REPAIR INSTRUCTIONS section to complete
the camshaft replacement.
5_106_00.bk Page 292 Friday, August 4, 2000 11:17 AM
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