General Rules; Section 12. Repair Standards - Isuzu A-4JA1 Workshop Manual

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General rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

Repair standards chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
1. These tables provide standards relating the repair of the following diesel engine;
2. These Repair Standards are based on inspection items, together with dimensions, assembly standards,
limit values, and repair procedures.
(1) Nominal dimensions are the standard production values.
(2) Assembly standards considered to be the values used as objectives during the assembly
procedures which follow repairs; as a result, they may be somewhat at variance with the assembly
dimensions of a new engine.
(3) Limit values refer to the measured values resulting from wear, etc., beyond which a part must not
be used. If a measured value falls beyond the limit value, the part involved must be repaired or
replaced.
(4) "Repair Procedures" indicates normal repair methods.
(5) Unless otherwise stated, the unit of numerical values in tables should be taken to refer to
millimeters, mm (in).
3. Explanation of Terms Used in Tables
(1) The dimension of "wear" refers to the difference between the dimensions of a part which is not
worn (or the "nominal dimension" of a part without wear) and the dimension of the part suffering
from the most wear (the dimension of the worn part).
(2) Uneven wear means the difference between the maximum and minimum wear values.
4. When repairs are requested on the overall engine, first perform bench tests to determine what parts
require repairs, then perform the minimum disassembly and repairs required to correct the problems.
When repairs on a specific engine part are requested, repairs to be made in reference to the relevant
items in accordance with the repair standards listed in this manual.
SECTION 12
REPAIR STANDARDS
TABLE OF CONTENTS
General Rules
Model A-4JA1, A-4JB1
REPAIR STANDARDS
PAGE
205