Bobcat 741 - Page 202

ENGINE DIAGNOSIS AND TESTING (Cont'd)
Camshaft Lobe Lift (Cont'd)
Make sure the pushrod is in the valve lifter socket. Install
a dial indicator so the ball socket adapter of the indicator
is on the end of the push rod and is vertical with the
pushrod movement [A].
Turn the crankshaft over until the lifter is
in its lowest
position, highest indicator reading.
Position the dial indicator at zero. Continue to rotate the
crankshaft at a
slow rate until the pushrod is in the highest
position, highest indicator reading.
Compare the
total reading on the indicator with the
specifications.
To check the original indicator reading, continue to rotate
the crankshaft
until the indicator reads zero. If the reading
on any lobe is below the specified wear limits, the
camshaft and the valve lifters must be replaced.
Remove the dial indicator gauge.
Install the rocker shaft
assembly.
Install the rocker cover.
Crankshaft End
Play
Move the crankshaft toward the rear, flywheel end, of the
engine.
Install a dial indicator and position the contact point
against the crankshaft flange at the front of the engine
and the indicator is
parallel to the crankshaft [8] .
Position the dial indicator at zero. Push the crankshaft
forward and note the reading
on the dial.
If
the end play is more than the wear limit, according to
specifications,
install new thrust washers. If the end play
is less than the minimum limit, check the thrust bearing
surfaces for scratches, rough areas or debris.
Flywheel Surface Alignment Check
Move the crankshaft
fully forward or to the rear.
Install a dial indicator so that the indicator point is against
the
flywheel surface.
Position the dial indicator at zero and turn the crankshaft.
Check the indicator reading.
If alignment is not specification, remove the flywheel and
check for dirt or other debris between the
flywheel and
crankshaft flange.
If alignment is not to specifications,
install a new flywheel or grind the crankshaft or flywheel
as needed to correct the alignment.
Revised
Oct. 97
-78-9-
741, 742, 743, 7430S Bobcat Loader
Service Manual