ADAPTER GP-COMMUNICATION 2700476 - Caterpillar

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Illustration 4 g00361933
Timing hole location (14) Plug
Remove the plug (14) from the flywheel housing. Install transducer adapter (5) into the hole that is remaining from the plug's removal. Tighten transducer adapter (5) only by a small amount.
Push magnetic transducer (3) into transducer adapter (5) until this adapter contacts the flywheel. Pull the magnetic transducer (3) out of the transducer adapter by 1.5 mm (0.06 inch). Then, lightly tighten the knurled locknut.
Illustration 5 g00361934
Transducer in position (3) 6V-2197 Magnetic Transducer
Connect the cables from the magnetic transducer (3) to 8T-5250 Engine Timing Indicator (1). Calibrate the indicator, and make any necessary adjustments.Note: See Special Instruction, SEHS8580 for more information on the calibration procedure.
Start the engine, and allow the engine to reach operating temperature. Then, run the engine at approximately one half throttle for eight to ten minutes. After this amount of time, measure the engine's timing.
Run the engine at increments of 100 rpm between 1000 rpm (base rpm) and high idle. Record the readings for engine timing, and then plot these readings onto a graph.Note: Use smaller increments to pinpoint the times when the timing advance starts. You can also use smaller increments to pinpoint the times when the timing advance stops.
Compare your results to the following values.
Settings for 3JK and, 8RG
Table 2
Permissible Dynamic Timing at Specified Engine Rpm
18° Static Timing (1)    
550 RPM    720 RPM    1062 RPM    1150 RPM    
18°     18.3° to 19.5°     24.1° to 26°     26.4° to 27.4°    
( 1 ) Engine arrangements 149-8154 , 149-8155 , 149-8156 and 149-8157
Table 3
Permissible Dynamic Timing at Specified Engine Rpm
19.5° Static Timing (2)    
550 RPM    720 RPM    1062 RPM    1150 RPM    
19.5°     19.8° to 21.0°     25.6° to 27.5°     27.9° to 28.9°    
( 2 ) All other engine arrangements
Settings for 7BL
Table 4
Permissible Dynamic Timing at Specified Engine Rpm
25° Static Timing (3)    
400 RPM    700 RPM    1100 RPM    1400 RPM    1600 RPM    
25.0°     25.1° to 26.1°     27.8° to 28.8°     31.7° to 32.7°     34.0° to 35.0°    
( 3 ) All engine arrangements
Settings for REA
Table 5
Permissible Dynamic Timing at Specified Engine Rpm
22.5° Static Timing (4)    
1200 RPM    1450 RPM    1770 RPM    1940 RPM    2200 RPM    
22.5°     22.5° to 23.4°     24.4° to 25.6°     25.6° to 26.8°     26.8° to 27.8°    
( 4 ) Engine arrangement 238-8190
Table 6
Permissible Dynamic Timing at Specified Engine Rpm
22.5° Static Timing (5)    
920 RPM    1312 RPM    1950 RPM    2200 RPM    
22.5°     22.5° to 23.7°     27.6° to 28.8°     28.5° to 29.7°    
( 5 ) Engine arrangement 238-8191
If the automatic timing advance is not correct, repair the automatic timing advance unit, or replace the automatic timing advance unit. There is no adjustment to the unit.