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Old 12-14-2019, 06:06 PM   #1
Newc
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Default Tutorial: patch repair to worn pinon splines '37

OK; Some time ago I asked about my worn pinon splines [10] in a '37 diff. and got a suggestion of loctite 660. Had to get it AND its primer from Fastenal cause it is a 'hazmat.' item. Can't be normally shipped. Also found directions on U-tube. Shear pin is a custom mfg'd .255 diameter, prefitted!
First clean drive shaft splines throughly with brake cleaner. This removes the easy oils and softens the serious oil residues. Cleaned splines with towels and then fine scotch brite pads. Since drive shaft is hollow, I had it tipped. Flushed with brake cleaner and towels. Inspected driveshaft splines with flash light. All clean and shiny now. Note, you have to scrub between the splines, on both parts
Second the pinon splines. Make a 'bib' to protect the bearings. Start your cleaning.. progressively working harder to get shiny metal. Same idea clean the worn surface and between the splines. Use the scotch brites up and get a clean pad. I cut them up with cheap blades. Now the worn surface is evident, it is the power side of the splines and I lightly scratched it with 240 grit paper. Final cleaning now.
Primer is lightly sprayed on the pinon only. Drys quickly. Now apply the 660 to the evident wear areas of the pinon splines. I may have been stingy with the 660..too late now. hope for the best.
Assemble driveshaft onto pinon correctly and insert shear pin. STOP-take a break. Driveshaft should be supported to prevent angle cure of product. After two hrs + shear pin can be expanded carefully, do not hammer without support to opposite side of pin. Think of those pinon bearings.
I will not get to 'test' this repair until the chassis is driving..soooo we'll see.
Photos for all;
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Last edited by Newc; 12-14-2019 at 06:11 PM.
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