What things should be included in a complete valve job?
Everything needed to restore a cylinder head to like-new condition,
including basics such as:
- Cleaning cylinder head and valve train components
- Inspecting head for cracks, leaks, warpage, or other damage
- Inspecting valves, seats, springs, guides, and other valve train
components for wear and damage (and replacing parts that cannot be
reused)
- Grinding or cutting valves and seats
- Restoring valve guides by knurling, relining or replacing, or
reaming guides and using valves with oversized stems
- Checking installed valve stem height, spring height and tension,
etc., and reassembling the head with new valve guide seals and any
other required parts
- Resurfacing head to assure flatness and a proper seal
The following "extras" might be required, especially on overhead cam
aluminum heads:
- Repairing leaks or cracks
- Straightening
- Overhead cam line boring
- Repairing threads
- Replacing seats
There is no such thing as a "standard" valve job. Every job is
different. An overhead cam aluminum head may require a lot more time
and effort than a cast iron head off a pushrod engine. There is
often no way to tell what a head will need in terms of repairs until
it has been cleaned, disassembled and inspected.
Exhaust valves and springs often need to be replaced. Valve guides
and/or seats may have to be replaced. The head may be warped or
cracked, requiring additional repairs. The list of things included
in a "complete" valve job will vary from job to job.
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