Page 25 - E BOOK ENGINE MECHANICAL M2

4. ENGINE OVERHAUL

You may pinpoint the cause of trouble, or
Basic check the components that may require re-
results
placement or repairs, if you start off by
identifying the problem mainly with your
eyes, ears, and fingers. You may then
confirm your suspicions with physical
Experience of Deduction of How car was tests like vacuum, compression, cylinder
troubleshooting trouble cause operated? leakage, and any other appropriate tests
and tools.
If you need to disassemble the engine,
you may do so only if you can recognize
Service history the reason for the disassembly, and per-
form it with careful observation of the re-
Fig. 4-3 moved parts. It is needless to say that
you should also have a sufficient
knowledge of the engine’s construction
and operation.

3. WORKSHOP MANUAL
When proceeding with an engine overhaul you should follow the description written in the respective
workshop manuals. Some important points that you need to understand on how to read the workshop
manual are as follows.

1. Assemble the bearing cap on the connecting
rod by aligning it with the mark put during re-
moval. If a new connecting rod without a mating
mark is used, assemble so that the detent
notch of the bearing is on the same side as il-
lustrated.

2. Make sure that clearance of the thrust of the
connecting rod big end is within specifications.

Standard value: 0.10 - 0.25 mm
Limit: 0.4 mm

<Definition of Terms>
Standard value:
Indicates the value used as the standard for judging the quality of a part or assembly on in-
spection or the value to which the part or assembly is corrected and adjusted. It is given by
tolerance.
Limit:
Shows the standard for judging the quality of a part or assembly on inspection and means the
maximum or minimum value within which the part or assembly must be kept functionally or in
strength. It is a value established outside the range of standard value.
Reference value:
Indicates the adjustment value prior to starting the work (presented in order to facilitate as-
sembly and adjustment procedures, and so they can be completed in a shorter time).

Pub. No. PTAE1225 4 - 2