Cummins/Onan GTA8.3 / GTAB.3 — Spark Plug Installation
Maintenance · Ignition system
For the Cummins/Onan GTA8.3 / GTAB.3, from the Cummins/Onan owner's manual.
Applies to: Cummins/Onan GTA8.3 engine
Before you start
- Mechanical overtightening can damage spark plug and cylinder head.
- Do not touch porcelain area on spark plug.
Procedure
- Install new spark plug in cylinder head with clean porcelain.
- Use extension and magnetic spark plug socket and thread in by hand.
- Torque spark plug to 35 to 41 Nm [26 to 30 ft-lb].
- Apply small amount of dielectric grease inside and outside spark plug boot.
- Carefully place plug boot onto spark plug terminal and press until snap is felt.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug torque 35 to 41 Nm [26 to 30 ft-lb]
Source: Cummins/Onan owner'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.