Drilling out valve guides
The guides help regulate the air intake and compression by keeping valves in place as the engine works. Guides also cool down the valves, with the guide absorbing about one-quarter of the heat generated. By constantly accommodating the valve stems as they thrust in and out with great friction, the guides are susceptible to eventually wearing out.
- Core Drills & Reamers Core Drill and Reamers used to bore out old "cast in head" valve guides to accept new press in valve guides. Core Drills and Reamers in many sizes (Standard and Specialty) that will fit a variety of Seat and Guide machines.
- As the guide moves out through the head, the mechanic should swap the aluminum drift for the steel item to complete the removal. Generally, the mechanic should be able to remove four valve guides (working quickly) without having to re-heat the head.
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