1993 SAS'd pick-up gets a front Spartan and a much needed check-up |
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(~107 BIG pics loading) |
OCT 18 2014 |
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Here's what Mark's 1993 SAS pick-up looks like as I work on his front 3rd at this moment. Nice weather :) |
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As received from Mark...good plastic tote with zip ties. |
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Lots of packing paper...Cola is very interested for some reason. |
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Looks like the Spartan Locker is in that package. |
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Front 3rd is there. |
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Bottom of tote has minor damage due to the 3rd's lip punching at the floor. It takes a lot more padding to protect the tote floor ;) |
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4 cylinder Spartan and diff on the bench. |
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Those 4 pins are so much more stout than the other lunch lockers. |
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The first order of business is the pre-check. Backlash is checked on every tooth and was basically zero. See the notes at the end of this link to see the recorded values. |
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The 304 means this is from a Yukon box. This "brand" of gear is ok but I do have my favorites and those are Nitro and G2. |
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This wheel adjuster was not as tight as it needed to be.....If I tighten this side then I can increase the backlash and the carrier bearing pre-load will also firm up much more. |
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This side would not even turn indicating the threads were likely out of alignment. |
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It's more obvious to me but the camera does not show it too well that the adjuster is "cock-eyed".... pushed in more at the top than the bottom. |
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These 2 cap bolts were not as tight as they should have been... |
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...so I carefully removed the cap without disturbing the adjuster wheel. It was quite obvious that the threads were off one. |
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Wheel threads were just fine....no damage. |
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A quick look at the carrier bearings shows that they are in perfect shape...looks like maybe the hubs were never locked in yet. |
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Placing the wheel into the threads correctly shows that it still turns easily in the groove and no real damage. |
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Start the threads on the 2 long bolts... line up the bearing cap into the threads... |
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...it drops down just like it should... |
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....and a smack with the rubber end of the hammer makes a nice, solid seating sound indicating the threads are now in harmony with the universe. |
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Now the bearing caps can be tightened and the wheels will now turn with relative ease. |
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Backlash is set to about .007" |
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This adjuster is rotated about 4 notches tighter than before.... |
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...and this adjuster is a "don't know" because everything changed when the threads were re-aligned. |
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Paint is applied to 3 teeth and I'm using packing paper here to offer some resistance... |
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...while the ring gear is turned back and forth with a 17mm wrench. |
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Drive----nice...centered and slightly deep. My preferred condition. |
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Coast---surprisingly good. |
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Look at the tail of the comet....centered. Very good. (The right side is the tail) |
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This fuzzy pic of the 2nd tooth says the same. |
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And the 3rd tooth shows the comet about in the center from the face to flank direction. |
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Now to look at the pinion end ... For some unknown reason, the last installer decided to grind/flapper off about a full 1/8" of pinion and some nut also. |
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This triple drilled flange will replace the old one. |
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The nut was not exactly "tight". No Loctite either. |
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Grey RTV was used on the outside of the seal and it appears to be in good shape. No big dents in it. |
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Push the pinion out... |
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It already had a good solid collar on it....a Marlin collar as indicated by the tall neck at the top. |
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The 10 ring bolts were tight and appeared to have a high strength Loctite on them. |
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The Aussie Locker is to be removed ....and a Spartan will be put in its place. |
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But first, to finish up on the pinion end. Remove the seal. |
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The solid collar had some chatter wear so I used a flat surface and 120 grit to sand it smooth. I only remove .001" or less. |
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I checked all the way around the collar with this extra large set of 12" calipers and it was within .001" variance. |
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I tried the original 2.435" (collar plus shims) and the pinion pre-load was way too tight.....then added in another .0035" and still too tight,...added another .002 and still kind tight....added .001" and perfect at 5 in/lb pre-load. I can tweak the 5 into 10 just by tightening the nut a little tighter. That was .0065" that was added to the collar.....that means the collar was not installed properly....means it was effectively rattling around inside there. |
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Last chance to smother the bearings in gear oil. |
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The old flange was pretty rough over-all. |
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The seal surface did have a groove. |
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Glad that Mark wanted this new triple drilled flange. |
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Grease on the garter spring and grey rtv inside the bore. |
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This homemade seal installer works great. Made from an old race and an old flange. |
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A quick inspection inside to make sure the garter spring did not pop loose. All is good. |
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No anti-seize on this one...red loctite on those extra clean threads. |
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Ran it down hard with the electric impact and have about 7 or 8 in/lb preload. |
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I can get a little more rotation with the 150 ft/lb torq wrench and the double that it is attached to. |
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10 inch/pounds. Good. |
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Gonna be tough to ding that nut because of the limited surface left. The red loctite is more than sufficient but the ding will still happen. |
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Ding!! Jeez....I needed a more tempered punch it looks like. |
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Surfaces checked with a big file and checked aok. Hmmm, too much flash in this pic. |
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A quick check of ring gear run-out shows less than .001 deviation. Very good. Definitely too much flash. |
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Now onto the Spartan install. |
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These Aussie springs come out fairly easy with the right slotted screwdriver. |
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But first, it's a good idea to drive out the steel dowel that holds the cross-pin in place. |
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The cross-pin came out and was a snug fit. Sometimes, these holes get wallowed out and egg shaped but this one was as good as new. |
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Remove the remaining 3 springs. |
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Remove the drive couplers. |
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The Aussie is going back to Mark...less the steel dowel that does not belong in this pile. |
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Here is the Spartan ready to go in. |
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Sidegear couplers go in first....with NO thrust washer plates. |
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Loading the pins in place. |
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Push the pin down and insert the steel wire. |
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This is a pre-check that should be done and that is to measure the clearance between the crosspin and spacers. Needs to fall in the range of .006" to .020". |
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.013" would not fit and .012 fit snug in all 4 places.....unusually consistent. |
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Drop the one coupler in place.... |
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...and then the other. But, don't do as I just did and have the washer on the right side in backwards :) |
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It was easy to hold both couplers in place while pulling the wires out with the pliers. |
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Then slide the couplers til the pins snap into place. |
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....almost in place.... |
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Bam!!! In place now. :) |
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The new Spartan cross-pin goes in place. |
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Tap the dowel in place. |
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Use a center punch to distort the round hole so the dowel never gets a chance to wiggle out. |
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Red loctite... |
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...and 75 ft/lb on all 10 ring gear bolts. |
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Put the carrier/case in place making SURE the adjuster wheels are in the threads correctly and tighten the 4 long bolts also to 75 ft/lb |
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Set backlash while making sure there is good carrier bearing pre-load. |
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Medium strength blue loctite.... |
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.....10 ft/lb on both lock tabs. |
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I measured 17 in/lb for the total preload. 17 is the start torq required to turn the pinion AND the ring gear. Earlier, I measured the pinion bearing pre-load at 10 in/lb....so that means the carrier bearing pre-load must be the difference between 17 and 10.....that be 7 in/lb for CBPL. |
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Drive pattern check--- Centered and slight deep. |
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Coast pattern--- Again, it's centered and slight deep. |
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Back to NJ |