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Stuck Washer in Your Injector Hole? Try This!
August 25, 2025 · 4 min · 4K views
What this video covers
Removing stuck copper washers from the fuel injector holes in a Yanmar 3GM30 cylinder head requires patience and the right punch.▶ 0:00 The technique applies to the 2GM, 1GM, and related sub-variants.▶ 0:07 After pulling the head and pressing out the pre-combustion chambers, the copper washers often sit carbon-bonded in their bores and resist removal.▶ 0:11 Jon recommends soaking the chambers overnight with penetrant or freeze spray to break up carbon deposits before attempting extraction.▶ 0:47 The key tool is a small, blunt-ended punch — not a sharp centering punch or chisel tip.▶ 1:08 Working the punch around the washer's edge in stages, roughly three-quarters of the circumference, gradually separates it from the bore; a small screwdriver then levers it free.▶ 2:06 Using an aggressive chisel tip transferred dimples through the thin copper into the steel seat beneath — a mistake Jon made on the first washer.▶ 2:48 Because the damage stayed within the washer's footprint, the new part still sealed, but the lesson is clear: blunt punch only, light taps, and patience prevent scoring the steel seat.▶ 3:20
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