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Disassembly and Assembly
Always assemble or disassemble one part at a time. Do not
work on two assemblies simultaneously. Be sure to make all
necessary adjustments. Recheck your work when finished. Be
sure that everything is done.
Operate the vehicle to perform any final check or adjustments.
If all is correct, the vehicle is ready to go back to the customer.
Checking Torques on Fasteners with Lock
Patches
To check the torque on a fastener that has a lock patch:
1.
Set the torque wrench for the lowest setting in the specified
torque range.
2.
Attempt to tighten fastener to set torque. If fastener does
not move and lowest setting is satisfied (torque wrench
clicks), then the proper torque has been maintained.
Magnetic Parts Trays
Magnetic parts trays are becoming common in the service
facility because they are convenient and can keep parts from
becoming lost during a repair procedure.
However, hardened steel parts can become magnetized when
held in magnetic parts trays. Metal fragments that would
ordinarily be washed away in the oil and trapped in the oil filter
or magnetic drain plug during vehicle operation could be cap-
tured by magnetized parts in the engine, potentially causing
accelerated engine wear and damage.
Parts that will be returned to service inside the vehicle's
powertrain such as gears, thrust washers and especially
bearings should never be kept in magnetic parts trays.
REPAIR AND REPLACEMENT
PROCEDURES
Hardware and Threaded Parts
Install helical thread inserts when inside threads in castings
are stripped, damaged or not capable of withstanding specified
torque.
Replace bolts, nuts, studs, washers, spacers and small
common hardware if missing or in any way damaged. Clean
up or repair minor thread damage with a suitable tap or die.
Replace all damaged or missing lubrication fittings.
Use Teflon pipe sealant or LOCTITE 565 THREAD SEALANT
on pipe fitting threads.
Threadlocking Agents
Always follow specific service manual procedures when working
with fasteners containing preapplied threadlocking agents when
fastener replacement is recommended. When re-using
fasteners containing threadlocking agents, be sure to com-
pletely remove all existing threadlocking agent from fastener
threads with a wire brush or wire wheel. Also, be sure to
remove residual threadlocking agent from fastener hole using
an appropriate thread chasing device and compressed air when
using new or existing fasteners. Always use the recommended
threadlocking agent for your specific procedure.
1-4 2009 XB Service: Maintenance
Wiring, Hoses and Lines
Hoses, clamps, electrical wiring, electrical switches or fuel lines
if they do not meet specifications.
Instruments and Gauges
Replace broken or defective instruments and gauges. Replace
dials and glass that are so scratched or discolored that reading
is difficult.
Bearings
Anti-friction bearings must be handled in a special way. To
keep out dirt and abrasives, cover the bearings as soon as
they are removed from the package.
Wash bearings in a non-flammable cleaning solution. Knock
out packed lubricant inside by tapping the bearing against a
wooden block. Wash bearings again. Cover bearings with clean
material after setting them down to dry. Never use compressed
air to dry bearings.
Coat bearings with clean oil. Wrap bearings in clean paper.
When bearings are installed against shoulders, be sure that
the chamfered side of the bearing always faces the shoulder.
Lubricate bearings and all metal contact surfaces before
pressing into place. Only apply pressure on the part of the
bearing that makes direct contact with the mating part. Install
bearings with numbered side facing out.
Always use the proper tools and fixtures for removing and
installing bearings.
Bearings do not usually need to be removed. Only remove
bearings if necessary.
Bushings
Do not remove a bushing unless damaged, excessively worn
or loose in its bore. Press out bushings that must be replaced.
When pressing or driving bushings, be sure to apply pressure
in line with the bushing bore. Use a bearing/bushing driver or
a bar with a smooth, flat end. Never use a hammer to drive
bushings.
Inspect the bushing and the mated part for oil holes. Be sure
all oil holes are properly aligned.
Gaskets
Always discard gaskets after removal. Replace with new gas-
kets. Never use the same gasket twice. Be sure that gasket
holes match up with holes in the mating part. But be aware
that sections of a gasket may be used to seal passages.
If a gasket must be made, be sure to cut holes that match up
with the mating part. Serious damage can occur if any flange
holes are blocked by the gasket. Use material that is the right
type and thickness.
Lip Type Seals
Lip seals are used to seal oil or grease and are usually installed
with the sealing lip facing the contained lubricant. Seal orient-
ation, however, may vary under different applications.
Seals should not be removed unless necessary. Only remove
seals if required to gain access to other parts or if seal damage
or wear dictates replacement.
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