Re: '56 Patrician Diff Pinion Seal
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Home away from home
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I can now report the job's done. I topped-up the oil and tried to clean off the underbody protective coating recently applied by the diff yoke, but it all became too hard in the end so I settled for a wipe over (no one else can see it anyway). I was also thinking about regreasing the rear uni joint, that is until I realised it doesn't have a grease nipple fitted - surprisingly, has never had one. I could have removed two of the caps on applied some grease to them but that would be only doing half the job so I guess I'll wait until the uni needs replacing, hopefully never. Regards, John
Posted on: 2012/6/26 1:54
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Re: '56 Patrician Diff Pinion Seal
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I was also thinking about regreasing the rear uni joint, that is until I realised it doesn't have a grease nipple fitted
Typically OEM and NOS universal joints didn't have a grease fitting, NORS usually did.
Posted on: 2012/6/26 10:00
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Re: '56 Patrician Diff Pinion Seal
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Home away from home
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Looks like our throw away society started earlier than I thought! I'd much rather give a uni joint an occasional squirt of grease to prolong its life than have to remove the tailshaft to replace a worn one. Ah well, as Ned Kelly (one of our early bushrangers - outlaws) is reputed to have said when mortally wounded "such is life".
By the way, I tried to insert an item in the X-Ref about the National #5778 seal and some other stuff but it wouldn't accept it. I don't think it was because of the deodorant I'm wearing so it must be for some other reason.
Posted on: 2012/6/27 0:42
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Re: '56 Patrician Diff Pinion Seal
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The universals on my 34 which I'm confident are original both have grease nipples but in at least one reference Packard said to lubricate with heavy oil, not grease. I suspect the reasoning was that, as oil leaked out from around the cork seal the centrifugal force from shaft rotation would "feed" new oil from the little reservoir in the center of the joint out to the needle bearings. Grease would be too immobile for that.
Dropping the driveshaft to clean and repack the front and rear universals on a 55/56 isn't really that much of a chore. Randy Berger just did his (more recently that I did mine) and he might comment on the time required - I'd guess about 1.5 hours and doing that once for every 25,000 or so miles isn't really much of a chore, at least IMO. Would I prefer a grease fitting for rear? Yes, but I'd still be dropping the shaft every 10 years or so to clean, inspect and repack the front ball & trunnion.
Posted on: 2012/6/27 9:15
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Re: '56 Patrician Diff Pinion Seal
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Home away from home
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Thanks Owen, that's good advice and something I should have a go at too. What deterred me the other day was that two of the caps in the rear uni are pressed into the tail shaft fitting, and I don't have a press to work on them. How did you manage yours - knock them out, regrease and then press back in? If there's an easier (better) way of skinning the cat then I'd certainly get back under and do it. Regards, John
Posted on: 2012/6/27 18:06
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Re: '56 Patrician Diff Pinion Seal
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You can use two different size sockets and a large vise to press out the two rear bearings - AFTER you remove the circlips I did have the advantage of a tool to press them out.
Carefully remove and wash all the needle bearings one cup at a time and repack them. I like the newer blue grease as water will not wash it away. Do likewise with the front trunnion. Do not overpack the grease there. That should sustain you for 25K at least. Owen is about right on the money for time.
Posted on: 2012/6/27 22:01
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Re: '56 Patrician Diff Pinion Seal
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Home away from home
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Thanks Randy. I'll have to check again tomorrow but my recollection is that the two pressed in caps aren't locked in by a circlip, but I could be mistaken. I had gotten the impression that they are a force fit and that removing them wouldn't be easy and certainly not by using a vice and hand tools. Hopefully I've got that wrong and my setup is similar to yours and I can manage it my workshop (shed). Regards, John
Posted on: 2012/6/28 4:18
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Re: '56 Patrician Diff Pinion Seal
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John,
Don't know how similar or dissimilar '41 120 uni joints are to those in your Pat but mine were replaced earlier this year, see this this post from the Wade's Workshop blog in case it's of some assistance. Getting the captive housings out of the tailshaft's grip was the hard part. There were circlips there, well the '41 had 'em, maybe yours are covered in grime or grease?
Posted on: 2012/6/28 4:44
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Mal
/o[]o\ ==== Bowral, Southern Highlands of NSW, Australia "Out of chaos comes order" - Nietzsche. 1938 Eight Touring Sedan - SOLD 1941 One-Twenty Club Coupe - SOLD 1948 Super Eight Limo, chassis RHD - SOLD 1950 Eight Touring Sedan - SOLD What's this? Put your Packard in the Packard Vehicle Registry! Here's how! Any questions - PM or email me at ozstatman@gmail.com |
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Re: '56 Patrician Diff Pinion Seal
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Home away from home
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Thanks Mal, that's very interesting. The diagram in the '56 manual shows circlips on the outside of the caps but your pics show the circlips on the '41 are on the inside, so I'll definitely check that out as well. Also, I see your new uni joint does have a grease nipple and I'm starting to think along the lines that if I have to knock out the uni fitted now to regrease it, maybe I should fit a new one with a grease nipple and be done with it for now and the future. I'll just have to work out what and where. Regards, John
Posted on: 2012/6/28 22:38
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