Generac — Cleaning Engine Spark Plugs
Maintenance
From a Generac owner's manual covering: 9592, GN-570, Q-55G, Q-70G. Check it applies to your exact model before use.
Applies to: Generac 9592, Generac Q-55G, Generac GN-480 engine, Generac GN-570 engine
Before you start
- Sparking can occur if wire terminals do not fit firmly over spark plug terminal ends.
Parts for this job
- R45S Spark plug — Generac 9592 Amazon eBay $32.56
- 072347 Spark plug — Generac Q-55G eBay $1.99
Part numbers from the service-parts lists for Generac 9592, Generac Q-55G. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Remove spark plugs and clean every 100 hours of operation.
- Clean by scraping or wire brushing and washing with commercial solvent.
- Reset spark plug gap to 0.030 inch (0.8mm).
- Do not blast clean spark plugs.
- Reform wire terminals if they do not fit firmly over spark plug ends.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug gap 0.030 inch (0.8mm)
Full service-parts list: Generac 9592 →, Generac Q-55G →
Source: Generac 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.