SkyTrak 6036 Service Manual User Manual
Page 131
Section 8B
Cummins Engine
Model 6036/6036T S/N 9B0500 thru 14833
8B-11
2.
Inspect the belt for damage.
• Transverse (across the belt width) cracks
are acceptable.
• Longitudinal (direction of belt length)
cracks that intersect with transverse
cracks are not acceptable.
• Replace the belt if it has unacceptable
cracks, is frayed or has pieces of material
missing.
3.
Continue with next step.
8B.7.2 Tensioner Bearing
1.
Check the tensioner bearing, Fig. 8B.23.
2.
Spin the pulley and check to see that there are
no rough spots detected under hand pressure.
3.
Continue with next step.
8B.7.3 Fan Hub
1.
Check the fan hub bearing, Fig. 8B.23.
2.
Spin the fan and check for wobble or exces-
sive play (maximum end play should be no
more than 0.006 in. (0,15 mm).
3.
Install the drive belt.
NOTE: Installing the drive belt should be done by
positioning the belt over the grooved pulleys first
and then, while holding the tensioner up, slide the
belt over the water pump pulley, Fig. 8B.23.
Fig. 8B.24 Valve Covers
MA1520
Fig. 8B.27 Timing Pin Engaged
Fig. 8B.25 Checking Valve Stem to Rocker Arm Gap
2.
Locate Top Dead Center (TDC) for Cylinder
Number 1 by barring the engine slowly using a
1/2" drive and the Cummins Engine Barring
Gear (Cummins part number 3824591), while
pressing on the engine timing pin, Fig. 8B.26.
When the pin engages the hole in the cam-
shaft gear, Cylinder Number 1 is at TDC on
the compression stroke, Fig. 8B.27.
IMPORTANT: To prevent damage to the engine
or pin, be sure to disengage the pin by pulling it
out after locating TDC.
MA1780
Fig. 8B26 Locating (TDC) for Cylinder Number 1
MA1590
MA1610
8B.7.4 Check Valve Stem
to Rocker Arm Gap
The correct gap between the top of the valve stem
and the rocker lever with the engine cold is 0.010”
(0,25 mm) for the intake valves and 0.020” (0,51
mm) for the exhaust valves of the Cummins
Engine. Adjust the valves as shown in Fig 8B.25,
with a screw driver, a wrench and a feeler gauge.
Set the gaps between the valve stem tips and
rocker arms, Fig. 8B.25, in the following sequence:
1.
Remove the valve covers, Fig. 8B.24.