pt nickel steel, heat treated. 9.—Numbers and Bakelite cap molded on heat treatedplug which is held in crankcase with heat treated nutwith set screw through it on which the head is brokenoff. 10.—Numbers stamped on crankcase wall and a glassplaced over the numbers. The glass rests on a cork… … ^^\—A heat treated tool steel plug cast in the crankcase.A chill is placed across the plug so the heat will not softenthe plug. ^— ■^ sample has been made showing how plug is tobe cut for casting in crankcase. •^- ^ickel numbers ca.<t in aluminum crankca.se, thenumbers being high enough to go…
Automobiles · Aeronautics
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