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1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #1
Hello

Iv owned this car for close to 12 months, 4 months ago i had to replace my rear drivers side bearing as it had broken....today, i had to replace it again...my mechanic says its due to running a very wide setup but my setup is quite normal amongst the forums....19" brabus with 285/30/19 Nitto Innvo tires and SA brakes...anyone have an explanation?

Also, My tires are down to the warning strips (also replaced four months ago)
I drive a total of 400kms every day (uni is 168kms away) at 160+km/h speeds...iv read the reviews on innvo tires but none say anything of treadlife....is this also unusual?
 

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1999 SL500, 2004 CLK500, 2006 Cadillac SRX
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873 Posts
Your tires are 2.4 inches wider and 1.5 inches lower profile than what came from the factory and what the design in/for 1992 was (225/55-16). Your mechanic may be on to something there as the tire you are running would definitely create more stress as the sidewall would be reinforeced and stiffer than the 16" tire. I would check the part number of the bearing and see if the part number is the same for say a 1999 - 2002 SL500 as the tires from the factory for these years were wider and lower in profile, and there would be more stress from the V-8 - and also, maybe a different part manufacturer.
 

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1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #3
yes, you do have a point yet iv never seen a complaint from a forum member of 2 bearings in gone 4 months...it just seems fishy that it broke that fast...but yes, it was a diff part manufacturer...this time i have put in a bearing made by Febi Bilstein which is TUV approved
 

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97SL500R129, 01ML320W163, 94E320W124 & 93500EW124
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2,921 Posts
Hello

Iv owned this car for close to 12 months, 4 months ago i had to replace my rear drivers side bearing as it had broken....today, i had to replace it again...

Also, My tires are down to the warning strips (also replaced four months ago)
I drive a total of 400kms every day (uni is 168kms away) at 160+km/h speeds...
You may want to check your wheel alignment. It appears that your wheels are not tracking correctly so your wheel bearings are carrying extra load while your tires are scrubbing the road.
 

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1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #5
i do have slight alignment problem, yet the front tires are practically brand new with lots of tread left in them, maybe 80% while the rears are down to the strips...would an alignment solve the bearing and treadlife issue?
 

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97SL500R129, 01ML320W163, 94E320W124 & 93500EW124
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i do have slight alignment problem, yet the front tires are practically brand new with lots of tread left in them, maybe 80% while the rears are down to the strips...would an alignment solve the bearing and treadlife issue?

Based on your front and rear tire condition (assuming they are all mounted at the same time), you need a four-wheel alignment preferably by MB dealer or tire shops with proper equipment to do MB 4-wheel alignment.

If your wheels size and offset are within specs, and are properly aligned, you should have no problem with the bearings and tire's thread wear.

Good luck.
 

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1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #7
they were all mounted within the same time, maybe a week apart...ill do that hopefully after the first UAE R129 meet...thanks
 

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Greek God of the R129
SL500-500SEL-190E
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8,391 Posts
Did you lower the car?
That and the wider tires are game, also cheap bearings and grease.

Regards,
aam.
 

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1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #9
No, completely stock, as far as im aware, if the previous owner has lowered the car, then rear tire would have been eaten up for the inside faster but there is an even pattern of wear
 

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97SL500R129, 01ML320W163, 94E320W124 & 93500EW124
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Incorrect toe in/out of the rear wheels would result in even but quick tire wear.
 

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1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #11
how can i fix it? 4 wheel alignment?
 

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Departed 1998 SL500 (and the Pano is in Bogota)
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11,122 Posts
Whenever you change from factory setup, you are putting extra stress on the bearings and that might have caused the OEM bearing to fail in the first place (as indicated by Albert (aam))

2 bearings in 4 months is very unusual indeed. Hopefully that was due to cheap bearings, and replacing with better ones may solve the problem.

BUT when you remove the current bearings, you should inspect the other surfaces that are in contact with the bearings. If those areas are worn (due to the bad bearings), then a new bearing would not help and you have a different (and bigger) problem.
 

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1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #13
well, the first time it broke, i drove with a broken bearing for quite some time so the hub was grinded down, the second time, i had university exams and couldn't afford to leave the car at the shop or any time away from studying and driving to uni (168kms away) so again...grinded down the hub but other than that...no other contacts with the bearing...as said before...i do have a slight alignment issue and maybe a toe in/toe out...any ideas on how to fix toe in/toe out?
 

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Departed 1998 SL500 (and the Pano is in Bogota)
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11,122 Posts
When you drove it with a broken bearing, then the Hub and/or the Shaft could already be damaged. The only way to properly fix that would be to machine both surfaces and put in over sized bearings. Not a simple job as all three parts has to match each other. It may be cheaper to replace than to machine them.
 

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1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #15
actually, my mechanic was parting out an R129, so i used his hub, new bearings and put them together
 

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Departed 1998 SL500 (and the Pano is in Bogota)
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11,122 Posts
Not just the hub and bearings, you need to examine the shaft too. Those THREE things work together. One bad one will ruin the other two.
 

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Registered
1997 SL500, 1948 Rover 75 P3, 1984 Citroen 2CV, 1953 BSA Bantam D1, 1966 Velosolex Moped
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1,141 Posts
Hello

Iv owned this car for close to 12 months, 4 months ago i had to replace my rear drivers side bearing as it had broken....today, i had to replace it again...my mechanic says its due to running a very wide setup but my setup is quite normal amongst the forums....19" brabus with 285/30/19 Nitto Innvo tires and SA brakes...anyone have an explanation?

Also, My tires are down to the warning strips (also replaced four months ago)
I drive a total of 400kms every day (uni is 168kms away) at 160+km/h speeds...iv read the reviews on innvo tires but none say anything of treadlife....is this also unusual?
I'm a bit surprised nobody has mentioned the arithmetic here. 400 kms per day, is 2000 kms / week, nearly 10,000 kms per month, or 40,000 kms in the 4 month period mentioned. All done at 160kph /100 mph in a hot dusty climate, with a possible slight alignment problem on a very wide setup. It seems very hard usage to me, at least in comparison with most of our cars. Just my thoughts.....I may be wrong.
Regards
Steve
 

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97SL500R129, 01ML320W163, 94E320W124 & 93500EW124
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...as said before...i do have a slight alignment issue and maybe a toe in/toe out...any ideas on how to fix toe in/toe out?
The rear camber is fixed unless you installed an adjustable camber arms. The toe in/out is adjustable through the suspension links. A good alignment shop should be able to adjust it to within specified tolerance. Note that suspension links are mounted through rubber bushings that can cause mis-alignment when worn.

If your wheels are not wobbling, vibrating or making and humming or grinding noise, your bearings may still be OK. Have your wheels alignment checked before you R&R any parts.
 

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Moderator
SL55, 300SE, GL450, Daytona 955i
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10,293 Posts
how can i fix it? 4 wheel alignment?
That is certainly a good start...

also, make sure you use OEM bearing next time...

if it happens again, then check the width/offset of your rims/wheels


if you over do the track width, you put extra strain on the bearings...
 

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Registered
1992 SL300-24, 1998 BMW 750iL
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701 Posts
Discussion Starter #20
I'm a bit surprised nobody has mentioned the arithmetic here. 400 kms per day, is 2000 kms / week, nearly 10,000 kms per month, or 40,000 kms in the 4 month period mentioned. All done at 160kph /100 mph in a hot dusty climate, with a possible slight alignment problem on a very wide setup. It seems very hard usage to me, at least in comparison with most of our cars. Just my thoughts.....I may be wrong.
Regards
Steve
well, i am 22 years old and this is my daily driver....hopefully the G wagon (w460) sale goes through and ill be able to use the R129 as a weekend driver
 
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