TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 134 of 894
BREAKS-AIR
TRUCK SERVICE MANUAL
To test for leakage, apply 100 p.
s.
i.
air pressure
through the discharge port of the cylinder head and apply
soap suds to the discharge valve openings in the floor of
the cylinder head.
Leakage should not exceed a one
inch soap bubble in not less than five seconds.
If excessive leakage is found, leave the air
pressure applied and using a fiber or hardwood dowel
and light hammer, tap the discharge valves off their
seats several times to improve the seal between the
valves and their seats.
If the valves and valve seats
have been reconditioned properly, this will reduce the
leakage.
Leakage tests must also be made by applying
soap suds around the discharge valve cap nuts with air
pressure applied as above.
Leakage at cap nuts is not
permissible.
Inlet Valves and Seats
If inlet valve seats show signs of slight scratches
or wear, they can be reclaimed by using a lapping stone
and grinding compound.
If the seats cannot be
reclaimed in this manner, they should be replaced.
Install new inlet valve seats by pressing them into
cylinder block to dimensions shown in the specifications.
Inlet valves not worn excessively or damaged can
be reclaimed by lapping them on a piece of crocus cloth
on a flat surface.
REASSEMBLY
Installing Cylinder Block
Place new cylinder block gasket in position on
crankcase studs.
Position cylinder block on crankcase in
accordance with markings made before disassembly.
Install nuts and lock washers securing cylinder block to
crankcase.
Installing Cranks haft
If the crankshaft is fitted with oil seal rings, install
rings.
Position ball bearings and crankshaft in
crankcase, being sure the drive end of the crankshaft is
positioned as marked before disassembly.
If one end of
the crankcase is counter bored for holding bearing, be
sure the crankshaft is installed through the correct end of
the crankcase.
Carefully press crankshaft and bearings
into crankcase using arbor press.
Place a new rear end cover gasket in position over
studs on rear end of crankcase being
¾ sure the oil
hole in the gasket lines up with the oil hole in the
crankcase.
If end cover includes an oil seal ring, install
oil ring.
Position end cover over studs in crankcase
being sure oil holes in end cover line up with oil
A
holes in gasket and crankcase.
Install capscrews or nuts
securing end cover in place.
Install pipe plugs in end cover oil openings which are not
in use.
If opposite end cover includes an oil seal and the
seal has been removed, press a new seal in the end
cover.
Install a new end cover gasket.
Carefully position
the end cover to avoid damage to oil seal and install
capscrews or nuts securing end cover in place, Fig.
9.
Back to Top
