8 in OHV Valve Spring Compressor, 3–6.5 in Capacity

8 in OHV Valve Spring Compressor Tool

This 8 in valve spring compressor is designed for installing and removing valve springs on removed cylinder heads. It is intended for small-to-medium engines with overhead valves, including suitable diesel heads with deep-seated valves. Use it with an OHV cylinder head supported on a workbench; check the head geometry, spring location, and available clearance before service.

Fitment and Working-Clearance Check

• Intended application: Removed OHV cylinder heads on a workbench.
• Throat capacity: 3–6.5 in (7.6–16.5 cm).
• Throat clearance: 6 in (15.2 cm).
• Before buying: Compare these dimensions with the cylinder-head and valve-spring area; engine make alone is not a fitment guarantee.

This tool is not described for compressing valve springs with the cylinder head still installed on the engine block.

Controlled Compression for Removed Cylinder Heads

Position the compressor securely over the valve spring, keep the tool aligned with the spring, and turn the threaded rod gradually to compress or release tension. Support the cylinder head and keep hands clear of the loaded spring and retainers.

Reinforced Threaded Rod and Extended Handle

The tool uses an extended threaded rod and an ergonomic rubber handle to help apply controlled force. Confirm the compressor is seated securely and that the valve spring remains centered before applying load.

Use Notes

• Work only on a stable, supported cylinder head.
• Compress and release the spring gradually; stored spring energy can cause parts to eject.
• Wear appropriate eye protection and keep the compressor square to the spring.
• Follow the engine manufacturer’s valve-service procedure for keeper removal, installation, and final inspection.