Generac 004583-0 — Adjusting Valve Clearance
Adjustments · Engine valve train
For the Generac 004583-0, from the Generac owner's manual.
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Before you start
- Repeat process for the other cylinder.
Procedure
- Make sure engine is at room temperature (60-80 F).
- Remove spark plug wire and keep it out of the way.
- Remove four screws attaching valve cover.
- Rotate engine to bring piston to Top Dead Center of compression stroke.
- Loosen rocker jam nut; turn pivot ball stud with 10mm allen wrench.
- Check clearance between rocker arm and valve stem with feeler gauge.
- Hold pivot ball stud and tighten jam nut to 174 in/lbs.
- Install new valve cover gasket and re-attach valve cover.
Tools required
- #2 or #3 Phillips screwdriver Amazon
- 10mm allen wrench Amazon
- Feeler gauge Amazon
- Large socket and socket wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Correct clearance 0.002-0.004 inch (0.05-0.1 mm)
- Jam nut torque 174 in/lbs
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.