Portable generator valve clearance inspection

Performing valve clearance inspections is essential for proper engine operation. While valve clearance inspections can be performed by mechanically inclined homeowners who are very familiar with internal combustion engines, we strongly recommend contacting a Generac authorized service dealer for this maintenance task, as it requires special tools (such as a feeler gauge) and expertise.

Because valve clearance requirements vary by model, reference the maintenance section in the owner's manual for specific instructions on performing a valve clearance inspection on your generator. To find a copy of your portable generator owner's manual, see here.

In general, valve clearance adjustments for portable generators are required after the first 50 hours of operation, and every 300 hours thereafter. Again, consult your generator owner's manual for required valve clearance inspection intervals.