Grease fitting
 

Need to replace fittings on front spindle, I'll need to drill and tap them what size drill and tap should I use.
TIA
Dick

Re: Grease fitting
 

There are two ways the grease fittings go in - the ones that press in, and the threaded ones. I don’t recall off the top of my head which the front spindles are, but if they are threaded it is 1/8-27 NPT (tapered pipe thread). Proper drill size is letter R drill.

If they are press in then there are special drivers available from the vendors to help you install them without deforming them.

Also, when you install new bushings, be sure the holes in the bushings line up with the holes in the spindle so the grease has somewhere to go.

Re: Grease fitting
 

Is an "r" drill 1/8"?

Re: Grease fitting
 

R is .339
The spindle grease fittings are press in.

Re: Grease fitting
 

No, 1/8" pipe thread tap is quite a bit larger than 1/8" diameter as BobC suggests.

Someone correct me if I'm mistaken, but aren't the press-in fittings 5/16" diameter hole? But you need to be very careful, if you oversize the hole by wobbling the drill then the press-in fittings won't stay pressed in. Best to carefully remove the old fittings and then press new ones in without drilling. If the holes get so chowdered that the press-in fittings won't stay in then you can overdrill with the R drill and thread for screw-in fittings.

Re: Grease fitting
 

May I ask why you feel you need to do this? Those metal shavings are likely going to be a problem even if all goes well.