question

billfish

billfish

Senior Member
Having a continuing problem with a leaking rear pinion oil seal on my 51 ford vic. I replaced the seal with one from Mac's that cost about $9, being careful to mark and re-install nut and yoke in the same position. Seal continues to leak when I park it after a drive, maybe a few drops and than it stops until the next time i use it. No unusual play or noise from rear. Relief valve on rear is clear. Using SAE90, should I be using something different or heavier? Is there a better oil seal I could buy? Any ideas appreciated.
 
Was there a groove worn/cut into the yoke sealing surface at the seal? A redi-sleeve or another yoke might solve your problem
 
there is a spring inside the seal to help keep the sealing lip tight, the spring is wound backwards so one end of the spring can screw into the other end, unwind the spring, cut off a 1/4" of the spring, not the pointed end, and unwind the spring a little bit and put the ends together so they will screw into each other, put spring back in seal, now the lip will seat tighter, make sure you lube the seal lip and yoke, if a grove in yoke you will need to move it forward or back to miss the grove, the shim that was mentioned work ok, but its hard to get on straight, and it doesn't last long because its so thin and the seal lip can wear thru it
 
I'm going to remove and check yoke surface and consider a speedi-sleeve or shorten the seal spring as suggested.

Question is what type of lube would you recommend I re-fill rear with, considering it's age.
 
You probably have wear or a couple of scoring marks where it is seeping past. Open it up wipe any dirt and excess oil, leave clean oil residue on moving contact parts. Then load it up around the seal area inner and outer with RTV ( GE silicon sealer ) be generous, use black and you won't see it. Reassemble letting the RTV ooze out 360 degrees. wipe excess and let cure. It will not stick to the oily surfaces which turn but will seal both moving and non moving inner and outer contact areas. I did same on my original '35 ****** where the output shaft comes through to keep gear oil out of the flange area with the thrust bearing. Worked great, no leaks after that. looked good a year later when I installed a rebuilt ******.
 
I looked at the dimensions of the $11.95 MAC seal (part 49-19378-1)versus the $11.99 Advanced Auto seal (National brand #5778)and they are slightly different. The MAC i.d. is 1.61" (1 39/64) whereas the Advanced Auto seal i.d. is 1.55". Is it possible that the slightly larger MAC seal i.d. is the culprit?

The parts I looked up are for a 1950 Ford passenger car. If the 1951 calls for a diffeernt part I apologize for muddying the waters with bad info.
 
56shoebox said:
I looked at the dimensions of the $11.95 MAC seal (part 49-19378-1)versus the $11.99 Advanced Auto seal (National brand #5778)and they are slightly different. The MAC i.d. is 1.61" (1 39/64) whereas the Advanced Auto seal i.d. is 1.55". Is it possible that the slightly larger MAC seal i.d. is the culprit? QUOTE]
Click to expand...
56shoebox said:
That's a .060" difference or just about 1/16" - it's a hell of a difference on a seal ! :eek:
Click to expand...
 
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