connecting rod journals is in the downward, center
Place the inlet valve springs in the cylinder head.
p o s i t i o n . Insert the connecting rod with piston
Use a small quantity of grease to hold them in place,
through the top of the cylinder whose journal is
just enough grease to keep the springs from falling
down. Position and attach the bearing cap to the
out. Place cylinder head gasket on cylinder block.
connecting rod making sure the bolt lock washers
Carefully align cylinder head assembly on block and
are properly positioned on the cap. Tighten con-
install cap screws with lock washers. Tighten se-
necting rod bolts evenly and bend the two new lock
curely and evenly cap screw that holds cylinder
washer prongs up against the hex head of the bolt.
head to block.
Install the other connecting rod and piston in the
Air Strainer-Exploded View
If the compressor is type with air strainer, assem-
ble strainer (Fig. 13). Install a new strainer gasket,
UNLOADER MECHANISM (Fig. 12)
then strainer on cylinder block.
The unloader pistons and their bores must be
l u b r i c a t e d with special lubricant piece number
239379 (dimethyl polysiloxane) prior to installation.
If compressor is type with pad mounted gover-
If new unloader kits are being installed, the pistons
nor, install a new or factory rebuilt governor using
in the kit are already lubricated.
a new governor gasket.
Install the unloader pistons in their bores with
INSPECTION OF REBUILT UNIT
caution against cutting the grommets or distorting
the back-up rings. Position unloader plungers in
Check to be sure that covers, plugs or masking
their guides and slip them in and over the tops of
tape are used to protect all ports if compressor is
not to be installed immediately.
Install the unloader spring seat in the cylinder
Fit the end of all crankshafts with keys, nuts and
block; a small hole is drilled in the block for this
c o t t e r pins as required and then protect the ends
purpose. Position the saddle between unloader pis-
against damage by wrapping with masking or fric-
ton guides so its forks are centered on the guides.
Install the unloader spring making sure it seats over
the spring seats both in the block and on the saddle.
The open bottom of engine lubricated compres-
sors should be protected against the entrance of
Install inlet valve seats if they have been previ-
dirt during handling or storage, by installing a tem-
o u s l y removed. Position and install inlet valve
porary cover over base.
guides, then drop inlet valves in their guides. There
should be a loose sliding fit between guides and
TESTING REBUILT COMPRESSOR
In order to properly test a compressor under
CYLINDER HEAD ASSEMBLY
operating conditions, a test rack for correct mount-
ing, cooling, lubricating and driving the compressor
If previously removed the discharge valve seats
is necessary. Such tests are not compulsory if the
s h o u l d be installed. Drop discharge valves into
unit has been carefully rebuilt by an experienced
their seats. Install discharge valve springs and cap