This article explains how to check Cat 3208 engine timing and automatic timing Advanced Unit with 8T5300 Timing Indicator Group and 8T5301 diesel timing adapter set
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8T5300 Timing Indicator Group
(1) 8T5250 Engine Timing Indicator. (2) 5P7366 Cable Assembly.(3) 6V2197 Magnetic Transducer. (4) 5P7362 Cable. (5) 6V2199 &
6V3093 Transducer Adapters. (6) 8K4644 Fuse.
The 8T5300 Timing Indicator Group must be used with an 8T5301 Diesel Timing Adapter Group.
WARNING
A high pressure fuel line must be disconnected. Toavoid personal injury or fire from fuel spray, the engine must be stopped before the fuel line is disconnected.
When checking the dynamic timing on an engine that has a mechanical advance, Caterpillar recommends that the serviceman calculate and plot the dynamic timing specifications first on a worksheet like Form No.
SEHS8140. These worksheets are available in pads of50 sheets, order one Form No. SEHS8140. See Special Instruction, Form No. SEHS8580 for information required to calculate the timing curve. For the correct timing specifications to use, see the Engine Information Plate for the performance specification number and make reference to the Fuel Setting And Related Information Fiche.
NOTE: For more information on acceptable tolerances for dynamic fuel injection timing, see Service Magazines dated 4-1-85 and 10-28-85.
After the timing values are calculated and plotted, the dynamic timing should be checked with the 8T5300
Timing Indicator Group and the 8T5301 Diesel Timing Adapter Group. To do this, the serviceman must operate the engine from 1000 rpm (base rpm) to high idle and from high idle to 1000 rpm (base rpm).
Unstable readings are often obtained below 1000 rpm.
He must record the dynamic timing at each 100 rpm and at the specified speeds during both accelerationand deceleration. Then he should plot the results on the worksheet.
Inspection of the plotted values will show if the fuel injection timing is within specification and if it is advancing correctly.
1. Make reference to Special Instruction, Form No.
SEHS8580 for complete service information and use of 8T5300 Timing Indicator Group.
2. Loosen all fuel line clamps that hold No. 1 fuel injection line and disconnect fuel injection line (13)
for No. 1 cylinder at the fuel injection pump. Slide the nut up and out of the way. Put 5P7436 Adapter
(9) in its place and turn adapter (9) onto the fuelpump bonnet until the top of the bonnet threads are approximately even with the bottom of the “window”
in the adapter.
3. Put the 5P7435 Adapter (11) on 6V7910 Transducer
(10) and put the end of the 5P7435 Adapter (11) in the “window”of the 5P7436 Adapter (9).
4. Put fuel injection line (13) on top of 5P7435 Adapter
(11). Install 5P7437 Adapter (7) and tighten to 40
Nom (30 Ib ft).
5. Remove fitting (14) from the front housing. Install transducer adapter (5) into hole fitting (14) was removed from. Tighten only a small amount
6. Push the TDC magnetic transducer (3) into the transducer adapter (5) until it makes contact with the camshaft gear. Pull it back out 1.6 mm (.06 in)
and lightly tighten the knurled locknut.
7. Connect the cables from the transducers to the Engine Timing Indicator. Make a calibration check of the indicator. For caon check of the indicator. For calibration procedure, make reference to Special Instruction, Form No. SEHS8580.
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NOTICE ：
Be sure all test equipment cables are routed so theywill not come into contact with the V-belts or other rotating components.
WARNING
Work carefully around an engine that is running.
Engine parts that are hot, or parts that are moving, can cause personal injury.
8. Start the engine and let it reach operating temperature. Then run the engine at approximatelyone-half throttle for eight to ten minutes before measuring timing.
9. Run the engine at the speeds required to check low idle, timing advance and high idle. Record the engine timing indicator readings. If the engine timing is not correct, make reference to Fuel System Adjustments: On Engine, Fuel Injection Pump Timing
(Timing Pin Method) for static adjustment of the fuel injection pump drive.
10. If the timing advance is still not correct, or if the operation of the advance is not smooth, make arepair or replacement of the automatic advance unit. There is no adjustment to the unit.
1. Make reference to Special Instruction, Form No.
SEHS8580 for complete service information and use of 8T5300 Timing Indicator Group.
2. Loosen all fuel line clamps that hold No. 1 fuel injection line and disconnect fuel injection line (13)
for No. 1 cylinder at the fuel injection pump. Slide the nut up and out of the way. Put 5P7436 Adapter
(9) in its place and turn adapter (9) onto the fuelpump bonnet until the top of the bonnet threads are approximately even with the bottom of the “window”
in the adapter.
3. Put the 5P7435 Adapter (11) on 6V7910 Transducer
(10) and put the end of the 5P7435 Adapter (11) in the “window”of the 5P7436 Adapter (9).
4. Put fuel injection line (13) on top of 5P7435 Adapter
(11). Install 5P7437 Adapter (7) and tighten to 40
Nom (30 Ib ft).
5. Remove fitting (14) from the front housing. Install transducer adapter (5) into hole fitting (14) was removed from. Tighten only a small amount
6. Push the TDC magnetic transducer (3) into the transducer adapter (5) until it makes contact with the camshaft gear. Pull it back out 1.6 mm (.06 in)
and lightly tighten the knurled locknut.
7. Connect the cables from the transducers to the Engine Timing Indicator. Make a calibration check of the indicator. For caon check of the indicator. For calibration procedure, make reference to Special Instruction, Form No. SEHS8580.
NOTICE ：
Be sure all test equipment cables are routed so theywill not come into contact with the V-belts or other rotating components.
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WARNING
Work carefully around an engine that is running.
Engine parts that are hot, or parts that are moving, can cause personal injury.
8. Start the engine and let it reach operating temperature. Then run the engine at approximatelyone-half throttle for eight to ten minutes before measuring timing.
9. Run the engine at the speeds required to check low idle, timing advance and high idle. Record the engine timing indicator readings. If the engine timing is not correct, make reference to Fuel System Adjustments: On Engine, Fuel Injection Pump Timing
(Timing Pin Method) for static adjustment of the fuel injection pump drive.
10. If the timing advance is still not correct, or if the operation of the advance is not smooth, make arepair or replacement of the automatic advance unit. There is no adjustment to the unit.
