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Old 02-07-2006, 10:55 AM   #1 (permalink)
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Bearing failure...input needed

Well, I somehow managed to destroy a Timken 20 Series bearing. The bearing and race show no signs of discoloration due to heat buildup. When I pulled the shaft, there was this nice gray, metallic paste that was the remains of the grease and some cage pieces. The shaft(D60 35 spline) was dry. This bearing has less than 300 miles on it...there was also no sign of contaimenents in the oil when i pulled the diff cover.
The theory that I have is this ... due to my ARB leaking (copper line inside the diff had a hole worn in it due to being too close to the carrier) I was thinking that an air pocket may have formed,thus not allowing any oil to get to the bearing on the driver side,that in turn causing it to go crunch. Am I onto something here or crack? The axle is a Dana 60 with 35 spline shafts and I am the third owner of it. Was built by Currie. Any ideas or thoughts?
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Old 02-07-2006, 11:07 AM   #2 (permalink)
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Yeah, "currie"...
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Old 02-07-2006, 01:40 PM   #3 (permalink)
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Btt...need some thoughts/input here
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Old 02-07-2006, 02:02 PM   #4 (permalink)
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Not enough oil in the diff to run down the tubes
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Old 02-07-2006, 02:10 PM   #5 (permalink)
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Diff was full.
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Old 02-07-2006, 02:16 PM   #6 (permalink)
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no question on why the bearing failed, no lubrication..

why it did not get the lubrication is the question. are you useing the right cover? is this axle housing a dana? you said "d60 axle" the rear dana 60 housing fill hole is lower than a front HP 60 cover. is this a front or rear axle? you say "grease" so i'm thinking front axle. rear axle should have gear oil, or lube. not grease.
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Old 02-07-2006, 02:17 PM   #7 (permalink)
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no question on why the bearing failed, no lubrication..

why it did not get the lubrication is the question. are you useing the right cover? is this axle housing a dana? you said "d60 axle" the rear dana 60 housing fill hole is lower than a front HP 60 cover. is this a front or rear axle? you say "grease" so i'm thinking front axle. rear axle should have gear oil, or lube. not grease.
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Old 02-07-2006, 02:31 PM   #8 (permalink)
 
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Quote:
Originally Posted by steelman
no question on why the bearing failed, no lubrication..

why it did not get the lubrication is the question. are you useing the right cover? is this axle housing a dana? you said "d60 axle" the rear dana 60 housing fill hole is lower than a front HP 60 cover. is this a front or rear axle? you say "grease" so i'm thinking front axle. rear axle should have gear oil, or lube. not grease.
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Well, its got a plate, so it's a rear shaft. Do you not grease your bearings a bit on the initial install? I do.
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Old 02-07-2006, 02:40 PM   #9 (permalink)
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oops, just looked at the wasted bearing. and no i don't grease my rear axle bearings when first installed, i oil them like they say to do at timken.com

its a great web site. has pic's for trouble shooting, wear patterns, install dirrections, pre-loads, trq settings. etc...
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Old 02-07-2006, 03:01 PM   #10 (permalink)
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Quote:
Originally Posted by Rugger99
Diff was full.
When you say full, at what level was the oil? The level should be at the centerline of the axle shafts, and in effect the tubes will be half full of oil too.

Sure there is not a rag or something jammed up in there blocking oil from getting to the bearings?
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Old 02-07-2006, 04:40 PM   #11 (permalink)
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A few questions:

How many quarts does it take to fill? Depending on pinion angle, the fill hole may not be an accurate method.

What size tire and weight of vehicle? I run a set 20 bearing and 35 spline shaft in my 9" wearing 37's and on a 5,000 lb truck. I was afraid of this bearing as a weakness since my truck gets some raod miles.

What type of fluid? Synthetic is your friend.
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Old 02-07-2006, 07:55 PM   #12 (permalink)
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Diff had the correct amount of fluid. There was nothing in the tube to block the flow of oil. After talking with Dan @ BlueTorch....the race may not have been correctly seated when I put it in...so it may be operator error....oops , hell,it could have been worse.
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