Page 374
REPAIR INSTRUCTIONS, PART 2
Whenever a lifter bore is reworked or honed, be
sure that all metal and honing debris is cleaned
from all affected areas by flushing with a fresh
supply of suitable brake/parts cleaner.
Tappet Installation
1. Clean the cylinder block at the mounting
surface and bore, if required.
Use only a soft rag and solvent to clean the
cylinder block. Minor fretting at the EUP mounting
surface is acceptable.
2. Submerge the roller tappet into a container
of clean engine oil to allow oil to fill the
passage to the roller axle. Remove the roller
tappet and while holding it vertically, spin the
roller to make sure that oil flows to the
surfaces between the axle and roller. This
step is important to provide adequate
break-in to the axle and roller at initial
start-up of new components. Then, carefully
install the tappet into the bore using a finger.
Refer to Figure 447.
Pre-lubrication of the tappets is critical to provide
adequate break-in for new axle and roller parts at
initial engine start-up.
447
Figure 447 — Positioning Tappet
앫 The slot in the roller tappet MUST be
oriented outward to align with the pin in the
bore. The roller tappet should slide freely in
the bore.
앫 The tappet guide pins in the EUP bores are
factory-installed in all cylinder blocks and
should not be removed unless damaged.
Unit Pump Installation
1. Install two new O-rings on the replacement
EUP in the upper and lower O-ring grooves.
For engines with a history of fuel leakage into the
crankcase, a new delta seal O-ring (Figure 448)
is available through the MACK Parts System.
This seal should be used in the lower O-ring
position when necessary to correct leakage.
448
Figure 448 — Delta Seal O-Ring
5-111.bk Page 374 Monday, July 10, 2006 2:26 PM
To Next Page
Loading...
