Generac 9344 — Fuel Injection Timing Adjustment
Adjustments · Fuel injection pump and shims
For the Generac 9344, from the Generac service manual.
Applies to: Generac 9344
Procedure
- Install the injection pump using a shim 0.5mm (0.020 inch) thick.
- Remove the delivery holder at the front of the injection pump.
- Remove the delivery valve (IN); reinstall the spring and the delivery holder.
- Move the governor control lever to its full increase position to deliver fuel with No. 1 piston around 25 degrees BTDC.
- Slowly turn the crankshaft clockwise until fuel stops coming from the delivery holder; check piston position (16.5-17.5 BTDC).
- If piston position is later than 16.5 BTDC use a thinner shim; if earlier than 17.5 BTDC use a thicker shim.
- Assemble the delivery valve (IN); tighten the delivery holder to 29-33 Ft.-Lbs.
Tools required
- Shims Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Injection timing piston position 16.5-17.5 BTDC
- Delivery holder tightening torque 29-33 Ft.-Lbs. (4.0-4.5 m-kg)
Full service-parts list: Generac 9344 →
Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.