Adventures in Gear Oil, or why my wife is a Saint (abiet an angry one)

no_vaseline_IHB

New member
As many users know, I am working on a long term project car. The rear axle has less than 1000 miles of driving on it, but I assembled it about ten years ago. For the less auto savvy, here is a picture of the rear axle.



<img src="http://i176.photobucket.com/albums/w188/CraigMBA/column036.jpg" alt="" />



When I put it together in 1999, I was missing the gasket that goes between the housing and the removable center section. I used Permatex Ultra black silicone in lieu of the gasket (I didn't want to wait for it). After a decade of exposure to the gear oil, the silicone broke down and it leaked. This is pretty standard, and not unexpected. Since I was installing disc brakes anyway, and since this is the only piece of the driveline I hadn't cleaned/painted, I figured I'd pull it out and do it up out of the car so I wouldn't get overspray over the newly painted parts AND so I could safely drain the gear oil and not make a mess when I went to reseal it.



As many have noted, gear oil is nasty. Like concentrated decomposting fish guts nasty. Shrimp paste nasty. You get the point.



I carefully removed the fill plug and drained the axle lube (about two quarts) into a 6 quart pan about 5" tall. My plan was to pull the center section out over the pan so I didn't make a mess. Piece of cake. Here is a picture of the center section (installed):



<img src="http://i176.photobucket.com/albums/w188/CraigMBA/column037.jpg" alt="" />



To remove the center section from the axle is pretty simple once you get the axle out of the car. Eight bolts hold the two drive axles in the housing need to be removed, then you remove the nuts holding the axle housing together. Third member slips right out. Piece of cake.



I get both the axles out, and remove the housing nuts. At this point, I need to note that the third member is about 45 pounds, should slide right out, and looks like this:



<img src="http://www.metropartsmarket.com/rearend/product_2.jpg" alt="" />



While it's installed in the axle it's a 45 pound dead weight that is on one side of the axle housing, but I have carefully balanced straight up for easy extraction. Except for the silicone I used a decade ago has glued the third member to the housing. Nothing a little hammer and cold chisel won't seperate. Except...........it comes loose 1/2" and won't go any further.



W...T...F?????



I get two extra prybars and get my wife to come help me pry it the rest of the way out. Still no dice. The Mrs. observes it's caught on something. I state "On what? I got both the axles out. See, one's here and the other one is........missing?" Okay, it wasn't missing. It was still in the axle housing. Okay, so I didn't pull it all the way out. Stupid me. I reach over and yank it out. And here's where the fun begins.



The whole housing instantly rotates with the now freed third member STRAIGHT DOWN, dropping the 45 pound third member straight into the oil pan that I have neglected to drain - which contains two quarts of the most noxious substance known to man. I didn't get a picture of the splashdown, so an artist rendering will have to suffice.



<img src="http://www.space-art.co.uk/images/artwork/debris/Splashdown.jpg" alt="" />



The Mrs. gets the worst of it, and is now wearing about a quart of waste gear oil. She doesn't say a word and goes straight into the house. She is so mad, she won't talk to me for about two hours. In other news, tulips were on sale at Ralphs for $7.99.



<img src="http://whisperingwindscreations.com/Assets/GUI/productImages/63001_FreshTouchRedTulips.jpg" alt="" />



She let me back into the house. I am a lucky guy.
 
Hilarious. I feel for your wife. This could totally be a Mr NewToOC and me story. I sent the hubby a link to this. Also good choice on the tulips. Roses are a bit overdone.
 
I can remember working on my Olsmobile as a kid.

And having 90 Weight in my hair for days. Never again.

Here for your Differential viewing Pleasures.

A 10 Bolt with excellent Music. <object width="325" height="250"><embed src="http://www.youtube.com/v/youtube" type="application/x-shockwave-flash" width="325" height="250"></embed></object>

Note: Fluid in container. Not on people or driveway.



I am sure most of the members here have never had a "personal" experience

with 90 Weight differential fluid. Its a smell that you can never forget.
 
[quote author="no_vaseline" date=1238843549][quote author="effenheimer" date=1238832071]I hate RTV. Hate it.</blockquote>


I hate Ford Friction Modifier.</blockquote>


You could just upgrade from a clutched differential to a cone differential. BUT i warn ya, it clanks and clatters back there and the engagement is NOT subtle.



-bix
 
She's a keeper for sure!



I have a somewhat similar gear oil story. I was working on a buddy's Audi, refilling the rear housing. I have a shop tool I made from large PVC pipe. about 7" diameter and 3' long. I capped both ends and had threaded a couple brass fitting into it. I use it to transfer various fluids in and out of cars. In this case we had filled it with a couple quarts of gear oil (it's a real trick to refill a differential while it's still under the car!). I ran a hose from the bottom of the cannister and I was under the car, holding it in place at the fill port. I had instructed my friend to use the air hose to pressurize the cannister from the top to force the oil through the hose and into the car. Except I wasn't clear enough. I meant for him to add a *little* pressure. He went heavy with probably 80 psi, which worked for about 10 seconds before all hell broke loose. A large explosion went off next to me and I almost soiled myself. I pulled myself out from under the car, expecting to see my friend maimed or worse. My girlfriend and the neighbors came out to see what was going on. There was my friend, sitting on the ground, laughing hysterically. His frontside was drenched in gear oil. The bottom cap had blown off the tube toward the ground, followed by the oil, which splashed everywhere. Complete coincidence, but I'll be working on the same car next weekend. Just brakes/rotors though, no gear oil involved.



I also have a pissed off woman story. I was trying to press out the bushings and ball joints on a steering knuckle, and I didn't have all the right tools/drifts to do it properly. So I jury-rigged a setup using metal blocks and a couple of cast iron plates. I didn't have enough hands to hold everything and work the hydraulic ram, so I had my girlfriend help hold the stack of parts. She was kneeling on the floor as I worked the press, slowly pushing out a ball joint with a force of about 3-4 tons. Near the end, the ball joint popped out of the knuckle. The only thing holding everything together was the compression from the press, and when the piece popped out, everthing came tumbling down like a Jenga tower. One of the cast iron plates, which weighed about 15 lbs, landed squarely on my girlfriends thigh. I did NOT get the silent treatment. She got one heck of a bruise that lasted almost a month.
 
[quote author="no_vaseline" date=1238934449]You have to use Friction Modifier in Detroit Lockers too.</blockquote>


Yea, but I still think you should upgrade to a custom 9". That would realy get everything going. But you're still stuck with a

similar setup.



Anyways good luck

-bix
 
As long as I don't drag race it with sticky tires the 8" will be fine, but you're not wrong. It will cost me $2K for a housing and a center section. Right now I just want the damn thing finished so I can play cards in my garage.
 
[quote author="no_vaseline" date=1238972164] Right now I just want the damn thing finished so I can play cards (<strong>aka make money</strong>) in my garage.</blockquote>
fixed it for ya!

ha ha
 
[quote author="Daedalus" date=1238940901] I have a shop tool I made from large PVC pipe. about 7" diameter and 3' long. I capped both ends and had threaded a couple brass fitting into it. I use it to transfer various fluids in and out of cars. In this case we had filled it with a couple quarts of gear oil (it's a real trick to refill a differential while it's still under the car!). I ran a hose from the bottom of the cannister and I was under the car, holding it in place at the fill port. I had instructed my friend to use the air hose to pressurize the cannister from the top to force the oil through the hose and into the car. Except I wasn't clear enough. I meant for him to add a *little* pressure. He went heavy with probably 80 psi, which worked for about 10 seconds before all hell broke loose. A large explosion went off next to me and I almost soiled myself. .</blockquote>


Did you recieve a patent recognition for this Fuel/Air/GearOil Bomb yet?



It scares the shit out of me just thinking about it! Terrorists make pipe bombs out of PVC!
 
Daed,

When did you think 80psi in a PVC tube would be a good idea? Those tubes are made to handle like 2-5 PSI..... Even at 5 psi its a 200 lb load on that oil. With 80 psi.. that like a 3100 lb!!!!!!!!!! load... er... uhh.... I though you were a engineer? (*tease tease*) ;-P



Well live and learn, i'm sure the next time the tube will have a pressure gage and a Low Pressure BOV.
 
[quote author="no_vaseline" date=1239116251]



Did you recieve a patent recognition for this Fuel/Air/GearOil Bomb yet?



It scares the shit out of me just thinking about it! Terrorists make pipe bombs out of PVC!</blockquote>Terrorists and mischievous high school kids ;). I recall mixing up a couple batches of gunpowder as a kid. It burned, but not very well.



[quote author="biscuitninja" date=1239157709]Daed,

When did you think 80psi in a PVC tube would be a good idea? Those tubes are made to handle like 2-5 PSI..... Even at 5 psi its a 200 lb load on that oil. With 80 psi.. that like a 3100 lb!!!!!!!!!! load... er... uhh.... I though you were a engineer? (*tease tease*) ;-P



Well live and learn, i'm sure the next time the tube will have a pressure gage and a Low Pressure BOV.</blockquote>


2-5psi? Sch 40 PVC in that size is good to about 140psi. Even municipal water can be upwards of 100 psi during off-peak hours. It was the end caps that weren't cinched down real tight. If I though I'd be dealing with that kind of pressure, I would have used glue-on caps. I thought the first thing to fail would be the threaded-in brass fittings, though I did epoxy them in. You're right, live and learn. ;)
 
[quote author="Daedalus" date=1239161754][quote author="no_vaseline" date=1239116251]



Did you recieve a patent recognition for this Fuel/Air/GearOil Bomb yet?



It scares the shit out of me just thinking about it! Terrorists make pipe bombs out of PVC!</blockquote>Terrorists and mischievous high school kids ;). I recall mixing up a couple batches of gunpowder as a kid. It burned, but not very well.



[quote author="biscuitninja" date=1239157709]Daed,

When did you think 80psi in a PVC tube would be a good idea? Those tubes are made to handle like 2-5 PSI..... Even at 5 psi its a 200 lb load on that oil. With 80 psi.. that like a 3100 lb!!!!!!!!!! load... er... uhh.... I though you were a engineer? (*tease tease*) ;-P



Well live and learn, i'm sure the next time the tube will have a pressure gage and a Low Pressure BOV.</blockquote>


2-5psi? Sch 40 PVC in that size is good to about 140psi. Even municipal water can be upwards of 100 psi during off-peak hours. It was the end caps that weren't cinched down real tight. If I though I'd be dealing with that kind of pressure, I would have used glue-on caps. I thought the first thing to fail would be the threaded-in brass fittings, though I did epoxy them in. You're right, live and learn. ;)</blockquote>


Well yes and no, with a 7" tube several publication say max operating is around 90-100psi. But you must take into account that water is not gear oil or another other fluid in there. PLUS when they charge lines they also raise the pressure in a controlled manner (water hammer will shatter THICK concrete and steel pipe rather easily also....). I wonder what the maximum shock pressures might be. Oh well....



I did kinda the same thing with helping a high school UUV (Unmanned Underwater Vechicle). My hydraulic oil compensator and hydraulic oil accumulator came back up with a malfunction pressure release valve. In this case it was about 40-50 PSI in a coke bottle container with baby oil. Once it let go I got a basting.... On the plus side, my skin was very smooth for the next few days.
 
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