FUEL PUMP TIMING TIPS - Ampac Machinery



FUEL PUMP TIMING TIPS

These are various tips to take into consideration when setting the timing on the fuel pumps that you will not find in the Lister Petter Service Manual. Use the manual as your guide with these tips as additional help.

1: Locating top dead center:

A: Remove rocker arm cover on Cylinder # 1, turn crank with 24mm socket until you are on the stroke where both rockers are not moving.

B: Remove fuel injector and insert 12-inch piece of straight wire (coat hanger works) into the injector port. Slowly turn crank (do not pinch wire) until wire reaches its highest position.

C: Use a pocket mirror to look into inspection hole for flywheel to locate timing marks on the flywheel. A flashlight is helpful. Be sure your mirror is square to the flywheel and count you marks. Standard setting is 20 degrees BTDC. : for standard application. High altitude requires more in advance timing BTDC. Mark timing marks with whiteout. This is useful as the flywheel has two timing marks, one for each cylinder. Once the timing mark is marked for cylinder #1 do not mark the timing mark for cylinder #2.

2: Removal of injection pumps:

A: Loosen the governor fuel adjustment bolt by 2 complete turns. This will aid in the removal and installation of the pumps by allowing more movement for the governor arm.

3: Shims

Black .010

Purple .005

Green .003

Keep shims with each individual pump. Carefully peel the shims apart –they are known to stick to each other. Count the total number of shims. Removing .003 -.004 advances the timing by 1 degree. Do not count the shim that is located between the flat locking plate and the injection pump.

4: If for some reason the shims get mixed or misplaced:

Use depth mic to take measurement per the manual. Be sure that the surface where the injection pump mounts is flat. Sometimes there is paint buildup. Be sure that the depth mic is sitting so as not to be resting on the edge of the push rod tube seal.

5: Reinstalling the injection pump:

A: Turn pin on pump all the way to the left. Hold the locking plate up against the pump body.

B: The pin goes into a slot on the governor rack. You have to put the pin in this slot or damage can result. It is helpful to move the governor arm so that it is against the fuel adjustment bolt while doing this. After you have inserted the pump and you feel that the pin is in the slot of the governor rack move the governor arm back and forth, it should be free and you should see some back and forth movement of the injection pump. It is very easy to install the pump and have the pin to the right or left of the slot in the governor rack.

If you are not confident that you have the pin in the slot, a fail safe way to check is by removing the timing gear cover and shining a light into the governor rack.

C: After you are confident that the pin is in the rack rotate the crank the opposite direction so that the cam lobe is dropping and allowing the fuel pump to drop.

6: Install the hold down arm. For cylinder # 1 adjust the fuel inlet tube on the injection pump so that it is slightly left of center of the distance between the outside of vertical portion of the hold down arm and the push rod tube.

For cylinder #2 adjust the fuel inlet tube on the injection pump so that it is as close to the push rod tube as you can get and still install the fuel hose.

7: Remember after installing injection pumps to put the fuel adjustment bolt back to its' original position.

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