[211 Hd] Flywheel Housing; Description; Inspection; Dowel Pins - Mack E7 Service Manual

5-101.bk Page 26 Friday, March 17, 2006 11:05 AM
Refer to Figure 6-25.
9. Check rod side clearance by installing a
thickness gauge between rod and side of
journal at the entire parting line area.
Figure 6-25 — Connecting Rod Side Clearance Check
10. The clearance must be within specification
shown in the Fits and Limits chart. If not,
recheck for proper cap and rod alignment.
Page 6-26
200 ENGINE ASSEMBLY

[211 HD] FLYWHEEL HOUSING

Description

Beginning in 1991, flywheel and flywheel
housings for E7 engines equipped with standard
transmissions incorporate engine timing and
engine turnover features. In addition, new
procedures and tools were introduced and must
be used to ensure optimum performance, engine
durability and emission compliance.

Inspection

Inspect the flywheel housing machined surfaces,
capscrews, holes and dowel locations for cracks
or wear. Replace if cracks are evident.
Before installing flywheel housing, examine
crankshaft flange for any cracks, surface damage
or presence of foreign particles. This type of
damage could ruin the sealing capabilities of the
new seal and lead to oil leakage.

Dowel Pins

The diamond locating dowel pins, used to install
the front timing gear cover, flywheel, and flywheel
housing, have been replaced in production by
blade-style locating dowel pins. The diamond
pins were dual-diameter type pins with a smaller
diameter at the round end that goes into the
cylinder block. The blade-style pins are the same
diameter at the round end and the blade end.
There are no changes in the size of the hole in
the flywheel housing. However, the cylinder block
has a larger hole to accept the blade-style dowel
pins. The old cylinder block flywheel housing pin
number is 183GC219 and the new number,
starting with serial No. 2T (August 1992), is
183GC237.
Use a dowel size and type that is appropriate for
the block being used. (Service old with old and
new with new.) Install the blade-style dowel with
the blade in a vertical direction (pointing up and
down).