Hercules GTA4800 — Valve grinding
Repair & overhaul · Valves
For the Hercules GTA4800, from the Hercules service manual.
Applies to: Hercules G4800 series engine
Procedure
- Inspect valve guides for excessive wear; renew before valve seat work.
- Use 30° angle grinding stone to grind valve seats.
- Check valve contact; keep valve seat near center of valve face.
- Narrow seat as necessary using 20° grinding stone.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve seat angle 30°
- Narrowing stone 20°
Source: Hercules service 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.