Caterpillar — Ignition System Spark Plugs - Inspect/Replace
Maintenance
From a Caterpillar owner's manual covering: B9P1-Up, CWW1-Up, CWY1-Up, GAS1-Up, GSB1-Up, GTX1-Up, GZA1-Up, GZB1-Up, GZC1-Up, GZG1-Up, GZH1-Up, GZJ1-Up…. Check it applies to your exact model before use.
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Before you start
- Ignition systems can cause electrical shocks
Procedure
- Remove valve cover, disconnect transformer and wiring harness
- Remove spark plug using socket/breaker bar; use seat cleaner if resistant
- Inspect spark plug shell, insulator, and precious metal tips for wear/damage
- Clean spark plug with glass beads on electrode only, then solvent
- Set electrode gap per engine Specifications manual using 9U-7516 gauge
- Install new gasket (9Y-6792), install spark plug and tighten to specified torque
- Lubricate O-ring seal, install transformer and valve cover
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- New gasket required each install: 9Y-6792 Amazon eBay $9.50
Source: Caterpillar 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.