Mack E7, Service Manual

Page: 110 / 303

Page 5-20
200 BENCH PROCEDURES
Inspection
Refer to Figure 5-19.
1. Thoroughly clean camshaft (3).
Use magnaflux (PT7190) inspection procedure to
detect cracks.
2. Inspect camshaft lobes and journals for
evidence of cracks, pitting, scoring or severe
wear. If any of these conditions exist,
replace camshaft.
3. Inspect camshaft gear (1), injection pump
driving gear (5), and camshaft captured
thrust washer (2) for cracks, pitting, scoring
or adverse wear.
4. Visually inspect key (4) for signs of distortion
or breakage.
Assembly
Two methods can be used to assemble camshaft
gears on a camshaft.
앫
Use the heat method to install new gears on
a new camshaft.
앫
Use the press method if reusing any service
parts. Do not use heat method on used
parts.
HEAT METHOD — CAMSHAFT/INJECTION
PUMP DRIVING GEAR INSTALLATION
Refer to Figure 5-19.
1. Thoroughly clean camshaft (3) and gears
(1 and 5) using a contact-type cleaner that
dries rapidly and leaves no residue.
2. Insert key (4) into camshaft (3). It may be
necessary to tap key with a rubber mallet to
ensure proper seating of key.
3. Install a new camshaft captured thrust
washer (2) on camshaft.
Figure 5-19 — Camshaft Assembly Components
200310a
1
2
3
4
5
1. Camshaft gear
2. Camshaft captured thrust washer
3. Camshaft
4. Key
5. Injection pump driving gear
SECT5.FR5 Page 20 Tuesday, March 21, 2006 12:49 PM