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Discussion Starter · #1 ·
What is the best way to lubricate those old block and pin u-joints? Do you just pour motor oil over them? Thanks in advance, Paul.
 
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What is the best way to lubricate those old block and pin u-joints? Do you just pour motor oil over them? Thanks in advance, Paul.
So it's a u-joint with no grease fitting is what you're saying? If so, should be factory pre-lubed and sealed. and the best thing I could recommend is spraying with a good pennetrating oil, though most manufacturers of non- greasable sealed parts suggest not lubing them. It's your call.
 

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So it's a u-joint with no grease fitting is what you're saying? If so, should be factory pre-lubed and sealed. and the best thing I could recommend is spraying with a good pennetrating oil, though most manufacturers of non- greasable sealed parts suggest not lubing them. It's your call.
be careful with the penitrating oil. If it a sealed, permanently lubricated bearing you will not need to do anything. If you spray a sealed bearing with penatrating oil you will dilute the grease and cause premature failure of the bearing. Please take pics of your u joint in question and we possibly can better advise you.
 

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Penetrating oil tends to turn to glue after about a week. Definately not made for long-term lubrication, or lubrication in any form. Its just a release agent. In applications where a spray grease is needed use a "chain and cable lube" or garage door lubricant type that is made for long term use.
 

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I know this subject can be contentious and I don't mean to be. I should have specified however. I know some folks will take issue with this product, but in my experience if it is used on the right stuff and fairly often, it does act as a pretty decent lubricant. I prefer WD40 for some of these tasks. In the case of a u joint with needle bearings, if it is really old and has no grease fitting I would bet the grease is already solidified and not acting as a lubricant anyway. In that case, I don't believe a product like WD40 or this stuff http://www.fluid-film.com/

would hurt, being used on needle bearings or other non nylon/ plastic type bushings, I'm pretty sure you would be safe. They say using a spray lube on nylon type sealed bushings can attract and hold fine particles which will accelerate wear of the soft plastic bushings to which there may be some truth, but I have encountered more problems leaving those things dry long term than I have seen by occasionally lubing them with WD. The only draw back to the Fluid Film product is that it has an awful smell. Just one man's opinion.
 

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Doe it once and do it right and replace the U-joint. Won't have to worry about it again. Just make sure the new joint has a grease zerk.
 

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Penetrating oil tends to turn to glue after about a week. Definately not made for long-term lubrication, or lubrication in any form. Its just a release agent. In applications where a spray grease is needed use a "chain and cable lube" or garage door lubricant type that is made for long term use.
Iv'e seen that happen at work.. Not the W-D but other spray lubes and penetrants...
 

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Discussion Starter · #8 ·
Doe it once and do it right and replace the U-joint. Won't have to worry about it again. Just make sure the new joint has a grease zerk.
I don't run junk parts on my tractors. I also don't replace things that aren't visibly worn. These 40+ year old u-joints, with the square blocks and 5/8" peened caps, aren't rebuildable. If I can lengthen their lifespan, then I will.
 
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