casting flaws in crankcase

[Steve Bryant]

I had a lot of small air holes in my crank case. The trick is to get the holes clean enough to accept a filler which in my case was J B Weld for Aluminum. I cleaned and opened the holes up slightly with a suitable bit in a Dremel tool and blew the debris  out with a blow nozzle. Once ready to fill the holes, warm both tubes A and B in hot water to thin the viscosity of the resin as it makes a better mix and easier application. If you want better penetration of the resin warm the area with a hair dryer or heat gun. Allow to cool and harden for 24 hours then smooth surface out with files, and abrasive paper. I would recommend priming the area and painting the crank case to finish.

AIR HOLES PREPPED FOR FILLING:
   

HOLE FILLED
   

HOLE FILED AND SANDED READY FOR PAINT
   

Hope this helps,
Stephen