DYNAMIC IGNITION TIMING

TM 10-3930-644-14&P

J. DYNAMIC IGNITION TIMING

9. If spark advance is functioning properly the D.C.

mark will move counterclockwise during

Ensure distributor point gap is properly set. (Refer to

acceleration and move back to D.C. alignment

Ignition Timing above.)

at engine idle speed. Reset engine idle speed.

1. Loosen clamp at the distributor only if required.

(Figure 5-6).

10. Shut engine off. Remove tachometer and timing

light. Install flywheel inspection cover.

2. Remove flywheel inspection cover.

NOTE

3. Connect timing

light

per

manufacturer 's

If lift truck is equipped with an oil

instructions.

clutch

transmission

use

static

ignition timing only to tine engine.

4. Install a tachometer and connect positive lead to

negative ignition coil terminal and connect the

K. GENERAL INSPECTION

negative lead to ground.

1. Clean fuel filter. Remove and clean fuel filter

5. Start engine and using carburetor idle adjusting

bowl. Clean screen in filter head. Refer to Fuel

screw, lower idle speed to 400 to 450 rpm sol

System.

that the automatic advance of the distributor is

fully retarded. THIS is VERY IMPORTANT TO

2. Clean air cleaner. Clean air cleaner element

OBTAIN CORRECT TIMING.

and cleaner. Refer to Fuel System.

6. Direct timing light at flywheel timing hole. If

3. Adjust valve clearances. Inspect and adjust

timing light strobe does not show perfect

valve clearances. Refer to Valve Clearance

alignment of D.C. mark with timing pointer,

Adjustment.

loosen distributor clamp and turn distributor until

it does. To advance timing, turn distributor

4. Adjust carburetor. With all the above operations

clockwise.

To retard timing, turn distributor

completed, start engine and operate until hot.

counterclockwise.

Adjust carburetor. Refer to Fuel System.

7. Lock distributor in this position.

8. Accelerate the engine a few times and observe

movement of D.C. mark after engine returns to

400 to 450 rpm.

M-104-1

2-10