Oil System Priming Shaft - Dimensions Needed

[r1lark]

Need some help fellow Patrolers.

Early next week I'm taking a trip to work on my Patrol, which is about 90 minutes away. Oil & filter change, and priming the oil system is on the agenda. I want to make a priming shaft to go in place of the distributor drive spindle. Spent about an hour searching old posts and can't find the info I need (but did find important info like the pump has to turn CCW).

Plans are to use a 5/16" or 3/8" carbon steel rod, and grind the tang on the end that will engage the oil pump. Will use a battery powered drill to drive the pump. I need to make the priming shaft here at home and need some help on dimensions.

Questions:
1) Anyone know the diameter of the distributor drive spindle? I'm not trying to match the shaft diameter, but wanted to make sure I don't go to big on the priming shaft diameter.
1) What would be a reasonable approximate overall length to make the priming shaft?
2) What is a reasonable thickness (dimension "a" in the pic posted below) for the tang, with the understanding I'm not making a new shaft so it doesn't need to be exact. I just don't want to end up with too thick a tang that won't fit into the oil pump.

Thanks in advance for any input!

Patrol drive spindle for distributor.jpg

[G60michael]

G'day mate, I've had a lot of G60s, Some that have Sat Idle in paddocks for a Decade or Several Decades, When I've Primed them up I Just Used a Cheep or Old Long Larger Flat Blade Screw Driver, With the See-Through Yellow Or other Colored Handle, Just Use a Hammer and Bash the Handle till it breaks apart then slip the Screw Driver Shank into the Drill and Spin it Anti-Clockwise, works well everytime for me.

Hope this Helps Mate, Cheers Mick

[Johnny Roadkill]

Not trying to talk you out of making a proper tool if that's a project you want, but I still have the 12" length of 3/16" rod with a bit of steel scrap wire-wrapped to one end I made 30 years ago for Datsun L series motor oil priming...would probably work on a P motor too...

...but if I were doing it over I'd use G60michael's screwdriver idea - $5 from Hammerbarn and much more elegant !

Cheers,
D

[r1lark]

Thanks for the feedback guys! All my flat blade screwdrivers are square stock, so that won't chuck up too well in the drill.
I've already got some round rod left over from something else, and realized I can take my battery powered 4-1/2 " angle grinder with me and use that to make the shaft to fit. Love these battery powered tools!