National oil engine Inside cilinder headAir cleaner dome needed some hammerworkTurned out OKReworked exhaust valve and new guideI made a hand cranked tool to cut the exhaust valve seatCutting the exhaust seatIntake valve and guideIntake valve seat is easier to cutTurning a new cilinder linerBoring the cilinder to receive the new linerBoring the installed linerHoning the new cilinderFinished cilinderPiston in the lathe to remachine skirt and ring groovesBoring the piston for a new piston pinTool I made to machine the crank journal in situMachining the crank journalTool to cut the journal radiusHand cranking the radius toolParts to become the new connecting rodBronze stock for new rod bearingsSmall end bearing and piston pinFinished connecting rodThe only original part is the top half of the small end bearing, all the rest was missingBig endNew cilinder head boltsCilinder head and cilinder assembly ready to installOne of the cam lobes was cracked so a new one was made