User Manual

200 BENCH PROCEDURES
Page 5-51
At this point, a used or scrapped cylinder head
can be used as a template for proper bracket
alignment and to ensure mounting surfaces of
each bracket are parallel.
12. Lubricate inlet rocker arm (3) and install on
shaft.
13. Assemble rocker arm retaining (coil) spring
(6) on shaft.
14. Lubricate exhaust rocker arm (5) and install
on shaft.
15. Place last (third) rocker arm shaft bracket (4)
and shaft on a flat surface. This bracket
does not have a threaded hole on top or an
oil hole at bottom surface. Align mounting
surface of bracket and offset with two
brackets already installed.
16. Check for proper bracket alignment. Ensure
that mounting surfaces of each bracket are
parallel. Press shaft into rocker arm bracket.
17. Lubricate and install outermost inlet rocker
arm (3).
18. Install flat spring and retaining snap ring on
end of shaft to keep inlet rocker arm in
place.
19. At opposite end of shaft, lubricate and install
outermost exhaust rocker arm (5).
20. Install flat spring (2) and snap ring (1) on end
of shaft to keep rocker arm in place. Some
rocker arm shafts are equipped with
threaded plugs and aluminum washers
instead of flat springs and snap rings.
21. Check all rocker arms to make sure they
rotate freely.
Dynatard Engine Brake Solenoid
Refer to Figure 5-64.
1. On valve rocker arm shaft assemblies
with a Dynatard engine brake, install
solenoid mounting adapter seal (O-ring) in
counterbore in rocker shaft.
2. Lubricate solenoid mounting threads with
clean engine oil.
Figure 5-64 — Solenoid Mounting Adapter O-Ring
Refer to Figure 5-65.
3. Assemble solenoid mounting adapter
into shaft and torque to 23–25 lb-ft
(31–34 N•m) with crows-foot adapter and
a calibrated torque wrench (J 24406 or
equivalent).
Figure 5-65 — Dynatard Engine Brake Solenoid
Installation
[266 KD] DYNATARD ENGINE
BRAKE
Dynatard Overload Protection
(E7 Engines with Dynatard)
E7 engines built after January 1, 1992 and
through mid-year 1993 are equipped with a
Dynatard overload protection system. From mid-
year 1993 through December 1993, E7 engines
were built with either the Dynatard system or a
Jake Brake. Mack Trucks, Inc. recommends
installing the Dynatard overload protection
system on all E7 engines built prior to
January 1, 1992. This system consists of a
5-101.bk Page 51 Friday, March 17, 2006 11:05 AM