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PROCEDURE 2
PROCEDURE 2 - PREVENTIVE MAINTENANCE (continued)
P
Installing the New Piston (FIGURE 8)
R
E
V
DO NOT lubricate or use oil on any moving parts.
The compressor eccentric uses a precision sealed
M
bearing.
A
I
1. Place a bead of Hernon # 846 on your finger and
N
apply around the inside of the bearing bore of the
T
new connecting rod.
E
2. Install the new piston by inserting the piston head
N
through the side of the compressor body.
A
N
3. Continue moving piston up into the upper compres-
C
sor housing with the connecting rod situated around
E
the eccentric nib (camshaft).
The eccentric set screw MUST face the flat spot on
the eccentric nib (shaft). Failure to do so may cause
3
damage to the compressor.
L
4. Reinstall the eccentric ensuring that the bearing
T
on the eccentric sits inside the piston connect-
R
ing rod.
C
O
M
P
R
E
B
U
Piston Head
I
L
D
Nib
(Camshaft)
Connecting
Rod
Bearing Bore
Spread
CONNECTING ROD DETAIL
WARNING
CAUTION
Piston
Connecting
Rod
(Slide Over
Nib).
Piston Set Screw
Access Hole
(After Piston is upright,
Centered and Eccentric is
reinstalled into Compressor,
install Aluminum Sleeve onto
Piston).
Compressor Housing
Cut-away for Clarity
Connecting
Rod Screw
FIGURE 8 - INSTALLING NEW PISTON
PREVENTIVE MAINTENANCE
5. Align the front face of the connecting rod with
the front face of the bearing leaving a clearance
of .032 (1/16-inch).
6. Apply a small amount of Hernon #423 to threads
of connecting rod screw.
7. Install connecting rod screw and torque to 15 in.
lbs. DO NOT OVERTIGHTEN.
DO NOT force aluminum sleeve onto piston. The
Teflon ring may become damaged and make the
piston unusable.
8. Turn the eccentric until piston is in the full up
position.
9. Place the aluminum sleeve partially over the pis-
ton head at a 45
O
10. Hold the piston in place and gently rotate the
sleeve onto the piston head and down until it
rests on the locator ribs of the compressor hous-
ing and over the piston.
Piston Head
w
/Teflon Ring
Connecting
26
CAUTION
angle with the tooled edge up.
Aluminum
Sleeve
Eccentric Set
Screw
Eccentric
Eccentric Bearing
Connector Rod
Screw
Rod
Eccentric
Nib
.032
ECCENTRIC DETAIL
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