'29 U-Joint Plug Threads

Posted by Pat Brothers On 2012/8/31 21:51:06

Hi:

Three of the four U-Joint plugs on our 626 have been replaced with Zerks. I can't tell from the one plug, but the Zerks appear to be 1/8" NPT.

I want to replace with plugs as per the manual. Am I correct that the threads are NPT or are then 3/8" NF?

As an aside, these Zerks have been used to grease the joints, although the manual calls for gear oil. Will I have any problems replacing the grease with gear oil? I plan to do this over time, just using gear oil to eventually replace the grease.

Thanks,

Pat