Pinion shaft

[lrcormier]

While rebuilding 52 PAN engine it was noted that end of pinion shaft has threaded hole. I researched and discovered that a left handed thread screw 24020-51 is installed in some applications. Is this screw necessary and what purpose would it serve?

[Rubone]

Yes it is necessary for proper oiling. Without it the oil comes out the end of the shaft and not to the rods as intended.

[lrcormier]

Thanks Rubone. One more question because I read somewhere but not sure if it was for this application that there is a .009 hole drilled in the screw. Is there also suppose to be a small hole in this screw or is it just a plug? I ordered a screw supposedly part # 24020-51 but it did not look like there was a hole in the screw, hopefully it is the correct part.

[Rubone]

It is a plug, no holes. Make sure it is not too long and covers the feed hole in the side of the shaft though. Some aftermarket are too long.