Cub Cadet Challenger 500, Service Manual

Page: 95 / 244

Engine
4 ‐ 8
Installation
1. Installing the rocker arms:

Rocker arms (1)

Rocker arm shafts (2)
Note:
The thread hole (a) of the rocker arm
shaft must face the outside. After
installation make sure (a) is correctly
positioned.
2. Installing the camshaft.

camshaft

camshaft sprocket:
Turn the crankshaft counterclockwise to
align the “I” mark (1) with the stationary
pointer (2) on the A.C. magneto cover.
This will set the motor at Top Dead Center.
Caution:
Do not turn the crankshaft during the
camshaft installation.
Temporarily install the camshaft sprocket
on the camshaft. (Do not install the bolts)
Install the timing chain on the sprocket.
Align the notches (4) on the decompression
cams with the projections (5) on the
decompression spring lever, then install the
camshaft sprocket on the camshaft.
Check the position as shown in the
diagram
(6) punch mark on spring lever.
(7) Top front of cylinder head.
Install decompression cam guide plate
(8) and camshaft sprocket bolts (9).
Camshaft sprocket bolt (20 Nm or 15 ft lbs)
NOTE:
UPDATED TIMING PROCEDURE ON PAGE 4-48