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Cylinder lapping tool: Toilet plunger
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Cylinder lapping tool: Toilet plunger
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Joined: June 02, 2004
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Location: Pearl River, NY
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Cylinder lapping tool: Toilet plunger Posted: Sun Dec 23, 2018 7:51 am     Views: 44      Rating: Not rated

To lap cylinder top surfaces flat, then lap the tops into cylinder head combustion chambers I made a tool based on a toilet bowl plunger. Inverted the rubber bowl, cut 3 wide "V" out so that the rubber contacts the cylinder walls with friction. Shortened the handle so that I could spin the tool between my palms. Also inserted a 1/4" stud so that I can drive the tool with a variable speed drill, which I use the most. Works very well. I first lap the cylinder on a flat glass mirror tile covered with 220 or 320 wet until I observe that the entire lip surface is uniformly smoothed. Then lap into the head using valve grinding compound.

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