Cummins/Onan PX12000e — Cleaning and Adjusting Spark Plug
Maintenance
For the Cummins/Onan PX12000e, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan PX12000e, Cummins/Onan EH65D engine
Procedure
- Unplug the high-voltage cables.
- Using the supplied plug wrench and handle, turn the plug counterclockwise until it comes off.
- Clean the area around the mounting hole and clean the electrodes if dirty.
- Adjust the clearance to 0.03 in. (0.7-0.8 mm); replace the plug if the projection is worn flat.
- Attach and tighten the plug to 25 to 30 Nm (19 to 22 lbs/ft).
- Check the plug cap contact area for corrosion and connect the high-voltage cables.
Tools required
- supplied plug wrench and handle Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug NGK BPR5ES FridayParts $9.83 (CHAMPION RN11YC)
- Gap 0.03 in. (0.7-0.8 mm)
- Torque 25 to 30 Nm (19 to 22 lbs/ft)
Source: Cummins/Onan operator's 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.