87
Maintenance Section
Overhaul Considerations
•
Oil consumption is in excess of 1 quart of oil
per 60 gallons of fuel that is consumed. The oil
consumption must not be caused by leakage.
•
Crankcase blowby is in excess of 2 cubic feet
per hour per horsepower. Measure the crankcase
blowby with an 8T-2700 Blowby Indicator .
•
Fuel consumption has increased.
•
Loss of power has occurred.
The cylinder head must be removed in order to
repair the piston, the ring, and the bore. After
removing the cylinder head, inspect the valves
and the valve seats. Repair the valve and the
valve seats, if necessary. Determine if any other
components of the engine should be inspected.
Overhaul Options
Before Failure Overhaul
A planned overhaul before failure may be the best
value for the following reasons:
•
Avoid costly unplanned downtime.
•
Reuse many original parts according to the
standards for reusable parts.
•
Extend the engine’s service life without the risk of
a major catastrophe due to engine failure.
•
Attain the best cost/value relationship per hour of
extended life.
After Failure Overhaul
If a major engine failure occurs and the engine
must be removed from the hull, many options are
available. An overhaul should be performed if the
engine block or the crankshaft needs to be repaired.
If the engine block is repairable and/or the
crankshaft is repairable, the overhaul cost should
be between 40 percent and 50 percent of the cost
of a new engine with a similar exchange core.
This lower cost can be attributed to three aspects:
•
Specially designed Caterpillar engine features
•
Caterpillar dealer exchange components
•
Caterpillar Inc. remanufactured exchange
components
Overhaul Recommendation
To minimize downtime, Caterpillar Inc. recommends
a scheduled engine overhaul by your Caterpillar
dealer before the engine fails. This will provide you
with the best cost/value relationship.
Note: Overhaul programs vary according to the
engine application and according to the dealer
that performs the overhaul. Consult your Caterpillar
dealer for specific information about the available
overhaul programs and about overhaul services for
extending the engine life.
If an overhaul is performed without overhaul service
from your Caterpillar dealer, be aware of the
following maintenance recommendations.
Rebuild or Exchange
Inspect the following components according to the
instructions that are found in various Caterpillar
reusability publications. The Special Publication,
SEBF8029 lists the reusability publications that are
needed for inspecting the engine parts.
•
Cylinder head assembly
•
Connecting rods
•
Pistons
•
Turbocharger
•
Oil pump
•
Fuel ratio control
•
Cam followers
•
Fuel Transfer pump
•
Timing advance
If the parts comply with the established inspection
specifications that are expressed in the reusable
parts guideline, the parts should be reused.
Parts that are not within the established inspection
specifications should be salvaged, repaired, or
replaced.
Using out-of-spec parts can result in the following
problems:
•
Unscheduled downtime
•
Costly repairs
•
Damage to other engine parts
•
Reduced engine efficiency
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