Mack E7, Service Manual

Page: 250 / 303

Page 7-10
200 SETUP AND ADJUSTMENTS
Slave Piston Adjustment
* Refer to 200 APPENDIX (at the back of this manual) for
list of selected 1990 E7 engine serial numbers requiring
0.080-inch (2.05 mm) thickness gauge No. 017099 for
slave piston adjustment.
To determine the proper Jake brake slave piston
lash setting for a particular engine, first determine
if the engine has the Jake brake only or Jake
brake plus Extarder, then refer to the appropriate
chart. The production change from the 5142
camshaft to the 5205 camshaft occurred mid-year
1996. To determine which camshaft a 1996
engine has, determine the turbocharger model
from the turbocharger identification plate. A
turbocharger model S3B or S4D means the
engine was built with a 5142 camshaft. A
turbocharger model S300 or S400 means the
engine was built with a 5205 camshaft.
If an S3B or S4D turbocharger is mistakenly
replaced with an S300 or S400 turbocharger on a
Jake Brake-equipped engine, slave lash
adjustment does not change. Slave lash
adjustment is determined by the original engine
camshaft, not the turbocharger.
Make this adjustment carefully. After slave piston
adjusting screw locknut is properly torqued to
40 lb-ft (54 N•m), recheck the clearance with the
Jacobs feeler gauge. Readjust as necessary.
1. Loosen the No. 1 cylinder slave piston
adjusting screw until the slave piston is fully
retracted in its bore (no drag on screw).
2. Insert the proper Jacobs feeler gauge
between slave piston feet and Jacobs yoke.
Turn the adjusting screw in until a slight drag
is felt on the feeler gauge.
3. Hold adjusting screw (to keep from turning)
and tighten locknut. Torque locknut to 40 lb-ft
(54 N•m) using torque wrench J 24407 or
equivalent. Refer to the Lash Adjustment
chart under Slave Piston Adjustment for
correct thickness gauge.
Engine and
Turbocharger
Model, and
Camshaft
Part No.
454GC —
Engine
Brake
Slave
Lash
Adjusting
Tool Part No.
1996/1997 E7
with 5205
camshaft and
S300 or S400
Turbocharger
Jake Brake
plus Extarder
0.085" 014177
1996/1997 E7
with 5205
camshaft and
S300 or S400
Turbocharger
Jake Brake
Only
0.060" 022001
1996 E7 with
583(A), 5142
camshaft and
S3B or S4D
Turbocharger
Jake Brake
Only
0.080"
018781/
020521
1991–1996 E7
with 583(A),
5142 camshaft
and S3B or
S4D
Turbocharger
Jake Brake
plus Extarder
0.100" 021327
1991–1995 E7
with 583(A),
5142 camshaft
Jake Brake
Only
0.080"
018781/
020521
Pre-1991 E7
with 583(A)
and 5142
camshaft
Jake Brake
Only
0.085" 014177
5-101.bk Page 10 Friday, March 17, 2006 11:05 AM