Hercules G-1600 — Cylinder Head and Valve Refacing
Repair & overhaul
For the Hercules G-1600, from the Hercules service manual.
Before you start
- Hand lapping valves is not recommended; do not lap excessively.
Procedure
- Discard burned, warped, bent, or worn valves; examine seats for wear.
- Clean water jacket of excessive scale and inspect cylinder head for warpage, scores, scratches, or nicks.
- Check valve guide bores for wear and examine port end for bell mouth condition.
- Check valve springs for proper pressure.
- Reface valves in conventional manner; valve margin, face angle and runout per Specifications.
- Reface valve seats; seat should contact valve at approximately center of valve face.
- Do not hand-lap valves excessively; if more than a few strokes needed, remove and grind more accurately.
- Install intake and exhaust valves, springs and retainers; compress springs and install locks and keys.
Specs & values
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.