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Spicer-18 woes
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Merl
I've posted before on a mysterious noise in my drive-train. It happens
primarily when rolling to a stop, its inconsistant but when it happens its like a low vibration or rumble...like a loose bearing or a loose gear on a shaft. To make a long story short, I think I've found the source and I need a bit of advice. The noise seems to be comming from my Spicer-18 transfer case, specifically from the "output shaft gear" (I'm getting all these names from my repro shop manual, the blow-up picture of the transfer case). This gear is *very* wobbly on the "output shaft". After isolating the noise to the transfer case and taking the pan off, I can jiggle this gear on the shaft a LOT. Putting a little rotational preasure on this gear, the teeth that mesh into the larger intermediate gear actually slide backwards and forwards almost 1/8 of an inch. I took the pan off of another transfer case I've got just to compare, and it isn't near as wobbly as the one in the Jeep...so I've got a high confidence level that this is indeed my problem. My question is, can the "output shaft gear" and perhaps the "output shaft" itself be replaced without removing the whole transfer case? The intermediate shaft was replaced about 1000 miles ago, and I believe it to be in good shape. Everything else up there looks to be OK, just this one wobbly gear so I hate to take the whole thing down. Any advice is appreciated, TATIA (Thanks A Ton In Advance). Merl |
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Chris Croyle
I can't give you a direct answer to your Spicer-18 gear
removal, but in order to remove the "#43 Output Shaft Gear" (Serv. Manual for Jeep Utility Veh.) you have to remove the #46 Output Shaft. And to remove the Output Shaft you'll need to remove sometimes difficult to remove snap rings. Those gears won't fit through the Spicer-18 bearing holes. Is your Output Shaft wobbly too? You'll be able to tell better if you disconnect your drive shaft and shake the Output Shaft. That's what lead me to my re-build. It turned out that my bearing$ and gear$ where OK :-) but the rear bearing adjustment shims were out of adjustment. The Output Bearing Cup and Bearing weren't holding the Output Shaft snug enough, thus making things fit loose inside my transfercase. Since I had everything apart, I replaced all the old bearings. If you have to remove the Spicer-18, (for encouragement) it's wasn't too difficult for me to do - I'm just a shade-tree mechanic. I hope your gears and output shaft are good - or at least your spares are. They can be expensive to replace new. Chris Croyle 1961 Willys 4wd PU From: Merl <hollow@...>drive-train. It happens primarily when rolling to a stop, its inconsistant butwhen it happens its like a low vibration or rumble...like a loose bearingor a loose gear on a shaft. To make a long story short, I thinkI've found the source and I need a bit of advice.case, specifically from the "output shaft gear" (I'm gettingall these names from my repro shop manual, the blow-up picture of thetransfer case). This gear is *very* wobbly on the "output shaft". Afterisolating the noise to the transfer case and taking the pan off, Ican jiggle this gear on the shaft a LOT. Putting a littlerotational preasure on this gear, the teeth that mesh into the largerintermediate gear actually slide backwards and forwards almost 1/8 of aninch. I took the pan off of another transfer case I've got just tocompare, and it isn't near as wobbly as the one in the Jeep...so I'vegot a high confidence level that this is indeed my problem.the "output shaft" itself be replaced without removing the wholetransfer case? The intermediate shaft was replaced about 1000 miles ago,and I believe it to be in good shape. Everything else up there looksto be OK, just this one wobbly gear so I hate to take the wholething down. Advance).
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Rus Curtis
Merl,
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I believe the output shaft is removable by itself but not easily. I've got mine up on the bench right now and have been messing with the output shaft and noticed that with the removal of the rear cap and the front yoke, the shaft can be driven (to press out the rear bearing cup). Once the bearing is free the shaft will slide out the back - provided you spread open and remove the snap ring up on the front of the shaft. The gears can then fall out the bottom. I do think it's easier to monkey with up on a bench though. If the gear ends up being tight on the shaft (after removal/ inspection) another thing to check is the bushing inside the front end of the output shaft. When you have time, I'd like you to check something for me. On the 'other' t-case you're using for comparison (I only have one), how much mesh do you have on the output shaft gear and the large ring on the intermediate gear (the ones with the slanted teeth)? On mine the output shaft gear is approximately 1/16th" further forward than the intermediate gear. I'm wondering if this is too much. -rus -----Original Message-----
From: Merl <hollow@...> To: WillysTech <WillysTech@...> Date: Saturday, October 17, 1998 7:33 PM Subject: [WillysTech] Spicer-18 woes From: Merl <hollow@...> I've posted before on a mysterious noise in my drive-train. It happens primarily when rolling to a stop, its inconsistant but when it happens its like a low vibration or rumble...like a loose bearing or a loose gear on a shaft. To make a long story short, I think I've found the source and I need a bit of advice. The noise seems to be comming from my Spicer-18 transfer case, specifically from the "output shaft gear" (I'm getting all these names from my repro shop manual, the blow-up picture of the transfer case). This gear is *very* wobbly on the "output shaft". After isolating the noise to the transfer case and taking the pan off, I can jiggle this gear on the shaft a LOT. Putting a little rotational preasure on this gear, the teeth that mesh into the larger intermediate gear actually slide backwards and forwards almost 1/8 of an inch. I took the pan off of another transfer case I've got just to compare, and it isn't near as wobbly as the one in the Jeep...so I've got a high confidence level that this is indeed my problem. My question is, can the "output shaft gear" and perhaps the "output shaft" itself be replaced without removing the whole transfer case? The intermediate shaft was replaced about 1000 miles ago, and I believe it to be in good shape. Everything else up there looks to be OK, just this one wobbly gear so I hate to take the whole thing down. Any advice is appreciated, TATIA (Thanks A Ton In Advance). Merl ------------------------------------------------------------------------ To unsubscribe from this mailing list, or to change your subscription to digest, go to the ONElist web site, at and select the User Center link from the menu bar on the left. ------------------------------------------------------------------------ ========================================================== WillysTech ========================================================== |
From: Merl <hollow@...>Sounds like the bearings need to be replaced Merl<grin>. I'm only grinning because the answer to your second question is Nope!!. Pull it down buddy and do the job "proper" (as they say in the classics). Now, if you have done the bearings you may need to Vernier the bearing hole in the case to see if its allowing the cone to move too much. I hope it's not that mate. Does this help? All the best, Ben.
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