DETROIT DIESEL 53
Valve Operating Mechanism 1.2.1
to make sure they are clean, smooth and free of score marks to permit proper
functioning of the cam followers. Any existing score marks must be cleaned up.
Check the cam follower-to-cylinder head clearance. The clearance must not
exceed .006 " with used parts. If replacement of a cam follower is necessary,
use the correct type service cam follower to be assured that the cam roller will
receive the proper lubrication.
The cam follower roller must turn smoothly and freely on its pin and the roller
must be free from flat spots or scuff marks. If the roller does not turn freely or
has been scored or worn flat, then examine the cam on which it operates. If the
cam is excessively worn or damaged, replace the camshaft.
Measure the total clearance between the roller bushing and pin, crosswise of
the pin, as shown in Fig. 5 and, if the bushing is worn to the extent that more
than
Fig. 8 - Valve and Injector Operating Mechanism
Details and Relative Location of Parts
Fig. 9 - Checking the Clearance Between the
Fig. 10 Adjusting Cam-Follower Guide
Cam Follower Guide and Cam Follower Legs
July, 1972
SEC. 1.2.1
Page 5
