Midwest Fuel Injection
Caterpillar 3406 B
CHECKING ENGINE TIMING WITH 8T5300 TIMING INDICATOR GROUP AND 8T5301 DIESEL TIMING ADAPTER GROUP
 

Tools Needed

8T5300

Timing Indicator Group

1

8T5301

Diesel Timing Adapter Group

1
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The 8T5300 Timing Indicator Group must be used with the 8T5301 Diesel Timing Adapter Group

WARNING: A high-pressure fuel line must be disconnected.  To avoid 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 without a mechanical advance, Caterpillar recommends that the serviceman calculate and graph the dynamic timing on a worksheet like form No. SEHS8149.  These worksheets are available in pads of 50 sheets, order one From No. SEHS8149.  See Special Instruction Form No. SEHS8580, for information required to calculate the timing curve.

After the timing values are calculated and plotted, the dynamic timing should be checked with the 8T5300 Engine Timing Indicator Group.  To do this, the serviceman must operate the engine from 1000 rpm (base rpm) to high idle and from high idle to 100 rpm (base rpm).  Unstable readings are often obtained below 1000 rpm.  He must record the dynamic timing at each 100-rpm and the specified speeds during both acceleration and deceleration.  Then h should plot the results on the worksheet.

Inspection of the plotted value will show if the timing is within specifications.  See Special Instruction, Form No. SEHS8580 for information required to calculate the timing

1. See the Engine Information Plate for the performance specification number and make reference to the Fuel Setting And Related Information Fiche for the correct timing specifications to use.
2. Make reference to Operation Instructions inside the lid of the 8T5300 Timing Indicator (1) or Special Instruction From No. SEJS8580 for complete Instructions and calibration.

WARNING: The engine must be stopped before the timing indicator group is installed.  A high pressure fuel line must be disconnected and a probe must be installed against the flywheel.
3. Loosen all fuel line clamps that hold N0. 1 fuel injection line, and disconnect fuel injection line (13) for the 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 fuel pump bonnet until the top of the bonnet threads are approximately even with the bottom of the “window” in the adapter
4. Put the 5P7435 Tee Adapter (11) on the injection transducer (10), and put the end of the 5P7435 Tee Adapter (11) in the “window” of the 5P7436 Adapter (9)
5. Put the fuel injection line (13) on top of 5P7435 Tee Adapter (11).  Install 5P7437 Adapter (7), and tighten to 40 N*m (30 lb ft).
6. Remove the plug from the flywheel housing.  Install transducer adapter (5) into the hole the plug was removed from.  Tighten only a small amount.
7. Push magnetic transducer (3) into the pipe adapter (5) until it makes contact with the flywheel.  Pull it back out 1.5 mm (.06 in) and lightly tighten the knurled locknut.
8. Connect the cables from the transducers to Engine Timing Indicator (1).  Calibrate and make adjustments.  For calibration procedure, make reference to Special Instruction Form No. SEHS8580.
9. Start the engine, and let it reach operating temperature.  Then run the engine at approximately one-half throttle for eight to ten minutes before measuring timing.
10. To adjust the speed where the fuel injection timing starts to advance, loosen locknut (15) and turn screw (16) clockwise to increase the speed where the timing advance starts.  One turn of screw (16) will change START speed approximately 50 rpm.  Tighten locknut (15) to a torque of 70 +- 15 N*m (50+- 11lb ft).
11. Stop the engine and remove cover (14).
12. To adjust the speed where the fuel injection timing starts to advance, loosen locknut (15) and turn screw (16) clockwise to increase the speed where the timing advance starts.  One turn of screw (16) will change START speed approximately 50 rpm.  Tighten locknut (15) to a torque of 70 +- 15 N*m (50+- 11lb ft).

NOTE: If the speed where timing advance starts is adjusted, the speed where the automatic timing advances stops should also be adjusted.
13. To adjust the speed where the fuel injection automatic timing advance stops, loosen locknut (17) and turn setscrew (18).  Turn setscrew (18) clockwise to decrease the stop speed,  One turn of setscrew (18) will change STOP speed approximately 30 rpm.  Tighten locknut (17) to a torque of 2.25 +- .25 N*m (20 +- 2 lb in).  6V2106 Tool Group (19) [part of 6V6070 Governor Adjusting Tool Group can be used to make this adjustment.
14. After each adjustment, install cover (14) and recheck the automatic timing advance with the 8T5300 Timing indicator Group.
15. If the automatic timing advance unit cannot be adjusted to operate within the correct range, or the operation of the unit is not smooth, replace the automatic timing advance unit (governor and fuel pump drive group).
16. If the adjustments are being make because of an engine horsepower rating change or for replacement of parts, start with an initial setting as follows:
a) Adjustment screw (16) must extend out from the retainer approximately 27.9 mm (1.10 in).
b) Setscrew (18) must be below the end of screw (11) approximately 17.78 mm (.700 in) on an engine with 11° timing advance and 19.05 mm (.750 in) on an engine with 10° timing advance.
17. To adjust the speed where the fuel injection timing starts to advance, loosen locknut (15) and turn screw (16).  Turn screw (16) clockwise to increase the speed where the timing advance starts.  Tighten locknut (15) to a torque of 70 +- 15 N*m (50 +- 11lb ft.).

NOTE: If the speed where timing advance stars is adjusted, the speed where the automatic timing advance should also be adjusted.
18. To adjust the speed where the fuel injection automatic timing advance stops, loosen locknut (17) and turn setscrew (18) clockwise to decrease the stop speed.  Tighten locknut (17) to a torque of 2.25 +- 0.25 N*m (20 +- 2lb in).  6V2106 Tool Group (19) [part of 6V6070 Governor Adjusting Tool Group] can be used to make this adjustment.
19. After each adjustment, install cover (14) and recheck the automatic timing advance with the 8T5300 Timing Indicator Group.
20. If the automatic timing advance unit cannot be adjusted to operate within the correct range, or the operation of the unit is not smooth, repair or replace the automatic timing advance unit (governor and fuel pump drive group).