Generac — Checking the Engine Spark Plug
Maintenance · Ignition system
From a Generac owner's manual covering: GT-530, GT-990, QUIETPACT INDUSTRIAL 55G, QuietPact 55 G, QuietPact 55 LP, QuietPact 65 G, QuietPact 65 LP, QuietPact 75 G, QuietPact 75 LP. Check it applies to your exact model before use.
Applies to: Generac QuietPact 75 LP
Before you start
- Sparking can occur if the wire terminal does not fit firmly on the spark plug terminal end.
Parts for this job
- 072347 Spark plug eBay $1.99
Part numbers from the service-parts list for Generac QuietPact 75 LP. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Clean the area around the base of the spark plug to keep dirt out of the engine.
- Remove the spark plug and check its condition; replace if worn or reuse is questionable.
- Check the gap with a wire feeler gauge.
- Adjust the gap to 0.040 inch (1.02 mm) by carefully bending the ground electrode.
- Reinstall the spark plug and reattach the spark plug wire.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug gap 0.040 inch (1.02 mm)
- Clean and reset gap every 100 hours
Full service-parts list: Generac QuietPact 75 LP →
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.