REPAIR INSTRUCTIONS
Page 287
11. Remove roller tappet from the EUP bore by
hand. Do not use a tool as it could damage
the bore. Place the roller tappet in a clean
area and cover it to prevent the entry of dirt
and other contaminants.
TAPPET GUIDE PIN INSPECTION
1. Visually inspect the EUP bore in the cylinder
block for protrusion of the guide pin into the
bore. If the pin protrudes approximately
2 mm into the bore and is not damaged, it is
OK and no further action is required.
2. If the guide pin end is damaged or does not
protrude approximately 2 mm into the bore,
replace it as follows:
a.
Using a 1/4-inch diameter punch from
outside of the cylinder block, drive the
guide pin from its bore.
b.
Clean the pin bore in the block and a
new pin, part No. 183GC252, with
Loctite
®
primer “T.” Then, coat bore and
pin with Loctite
®
609, or equivalent.
c.
Drive the pin into the bore until it is
flush with the cylinder block outer
surface as shown in Figure 313.
Occasionally, a failure will result in severe wear
and breakage of the roller and roller axle, causing
these parts to separate from the lifter body.
Subsequently, the lifter legs (which had retained
the axle in the lifter body) are bent outward and
driven up into the lifter bore by the cam lobe. This
action damages the bottom 1/4 to 3/8 inch of the
bore, preventing installation of a new lifter.
The damaged bore area must be cleaned up with
a file, stone, or emery paper before the new lifter
can be installed. Use care when removing raised
metal so not to enlarge the bore diameter. Any
remaining nicks or scores will not inhibit proper
function of the parts and cause no problem.
A small amount of scuffing or foreign particle
scoring in a lifter bore can inhibit static-free
movement of a lifter. While this will not cause a
lifter to hang-up during engine operation, it is
sometimes noticed during lifter removal or
installation. If this condition is encountered, use a
brake hone to lightly finish the bottom area of the
lifter bore. Trial-fit the lifter until the high spots
have been removed and free-movement is
re-established.
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. Generously lubricate the roller tappet with
clean engine oil and carefully install it into
the bore using a finger. Refer to Figure 313.
313
Figure 313 — Positioning Tappet
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.
5_106_00.bk Page 287 Friday, August 4, 2000 11:17 AM
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