TRUCK SERVICE MANUAL
BREAKS-AIR
Removing and Disassembling Cylinder Head
If compressor is fitted with an air strainer, remove
Remove capscrews or nuts from studs attaching
screws and lock washers securing air strainer in place
cylinder head and lift off cylinder head.
and remove air strainer and air strainer gasket.
'he cylinder may have to be tapped with a raw hide
hammer to break gasket joint.
If compressor has a Type D or D2 governor
Remove cylinder head gasket and scrape off any gasket
mounted on cylinder block, remove governor and gasket.
material that may remain on cylinder head and block.
Remove capscrews or nuts securing cylinder block to
Remove discharge valve cap nuts and lift out discharge
crankcase and remove cylinder block and cylinder block
valve springs and discharge valves.
gasket.
Removing and Disassembling Piston and
Remove unloader spring and unloader spring
Connecting Rod Assemblies
seat.
Straighten prongs of connecting rod bolts and
remove bolts and bearing caps. Then push pistons with
Remove unloader spring saddle, unloader plunger
connecting rods attached out the top of the cylinder
and unloader pistons.
Remove unloader piston
block. Replace caps on each connecting rod to avoid
grommets. Remove inlet valve seat bushings only if
damage to bearings.
Connecting rod caps and
seats are worn or damaged.
connecting rods are already marked with center punch
marks to show the proper position of the caps on the
CLEANING AND INSPECTION OF PARTS
rods.
Clean all parts using cleaning solvent to remove all
Remove piston rings from each piston. If pistons
traces of dirt, oil and grease before inspection.
are to be removed from connecting rods, remove wrist
pin lock wires from wrist pins and press pins from pistons
Cylinder Head and Components
Put cylinder head body through a cleaning solution
and connecting rods.
to remove all carbon from discharge valve cavities and to
remove all rust and scale from water cavities. Use air
Removing Crankshaft
Remove capscrews or nuts from studs, securing
pressure to blow dirt out of all cavities. Scrape carbon,
end cover to crankcase at drive end of crankshaft.
dirt, and particles of old gaskets from all surfaces.
Remove end cover with oil seal and gasket. If oil
Clean discharge valves not damaged or worn
seal needs replacing, remove it from end cover.
excessively by lapping them on a piece of crocus cloth
Remove capscrews or nuts from studs, holding opposite
on a flat surface.
end cover to crankcase. Remove end cover and gasket.
Oil Passages
Clean thoroughly all oil passages through
Some crankcases are fitted with a shoulder to
crankshaft, connecting rods, crankcase and end covers.
position the crankshaft in the crankcase. In such cases
If necessary, probe oil passages with wire and flush with
the crankshaft may be removed only through one end of
cleaning solvent.
crankcase.
Cylinder Block
Put cylinder block through a cleaning solution to
Removing Cylinder Block
When cylinder head is removed from cylinder
remove all carbon and dirt from inlet passages and
block, the inlet valve springs and inlet valves should be
unloader passages so as to remove rust and scale from
removed.
water cavity.
Clean inlet valves that are not damaged or worn
excessively by lapping them on a piece of crocus cloth
on a flat surface.
Scrape particles of old gaskets from all surfaces.
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