Rear wheel bearing fix

[Dessertrunner]

These are images of a replacement bear for the standard SVX rear.
Tony

[Dessertrunner]

The bearing is narrower and for that reason needs the spacers but its load rating is 60% higher then the current SVX units. I have run 80,000 k on this bearing compared to 15,000 after replacing the first one at 110,000k and 6 more to get me to 195,000. In the past a bent rim would cause the bearing to fail in 5,000k now the new bearing is not bothered by the rim damage. I drive in the dessert in outback Australia and travel 5,000K on dirt or rock at speed. The last thing I needed was a bearing failure out there but these have been brilliant. Hope this help people with there problem.
Tony

[michael]

This might be a dumb question but is that a subie part # for the replacement bearing?

[Dessertrunner]

Michael,
The part number is a NTN bearing number. Sorry should have explained.
Tony

[lhopp77]

Did you fabricate the spacers or did they come with the bearing set?

Lee

[ssnsltd]

If I may bug you for a bit more on the bearing "mod" I have not replaced mine so my intelligence level is way down on this.

So that one Part number 4T-CR1-08A01 NTN is for the set (both bearings above the number) in the picture? What brand are they?
I don’t suppose you have a verneer caliper laying around you can get the spacer measurements with do you?


Thanks!
David

[lhopp77]

NTN is a brand.

Lee

[Dessertrunner]

A bearing set is the two roller bearings and the double cone all as one assembly. If you go to a bearing shop and give him the part number for the NTN bearing he will hand you back the assembly. This does not include the spacers. I don't have a set of verners handy but will try to get you the sizes of the bushs. Its not hard to work out though the outer bush is the same outside Diameter of the bearing and the inside bush has the same inside diameter of the bearing. The stacked height of bush plus new beearing is the same as the height of the old bearings. The centre bush neeeds a chamfer to fit on the axle. You need to get the seals from the Subaru dealer. Hope that helps.
Tony

[Dessertrunner]

NTN is a major Japanese bearing maker the same as SKF. Your current SVX bearings are made by NTN. I will attempt to get the mesurement of the bushes for you.
Tony

[mbtoloczko]

Did you put the bushings inboard or outboard of the bearing?

[Dessertrunner]

It doesn't matter but the simpleist will be to put the bush on the out side of the car. Hope that explains it for you.
Tony

[mohrds]

The stock bearing is 4T-CRI-08A02
The replacement bearing part number is 4T-CRI-08A01

Here are the specs on each. All measurements are in inches unless indicated:

Bearing Number: 4T-CRI-08A02
Bore:1.65
Outside Diameter:2.83
Width Dimensions Outer:2.05
Width Dimensions inner:1.89
Seal: No
Dynamic Load Rating (lbs.):57,000
Static Load rating (lbs.):80,000
Weight (lbs.):1.70

Bearing Number: 4T-CRI-08A01
Bore:1.65
Outside Diameter:2.83
Width Dimensions Outer:1.50
Width Dimensions inner:1.38
Seal: No
Dynamic Load Rating (lbs.):75,000
Static Load rating (lbs.):105,000
Weight (lbs.):1.28

As you can see, The load ratings are much higher even though the bearing is physically smaller.

I have the posted the NTN specs page. From it you can see that the 4T-CRI-0881 may be a better replacement. It has all the same size specs, but an even higher load rating (44% higher than stock).

The spacers need to be .55 inches thick for the outer spacer and .51 inches thick for the inner spacer.

Doug

[oab_au]

Been thinking about Tony's bearing mod. It would increase the load carring capacity of the bearing, but I do worry about the decrease in the track spacing of about 27%. Tony has run them for long enought to show they can take the load, but I wonder about lateral loads. Where Tony lives is flat, he would have to drive a 100k to find a corner so the lateral load bearing quality is not so proven. Don't get me wrong, I think it is an improvement over the standard bearing.

Seeing that a spacer has to be made and fitted, I was thinking that it may be better to use two seperate heaver taper roller bearings with the spacers in between the two, so that the tracks stay the same distance apart, to handle the lateral loads. The width of the inner spacer would have to be sized to provide the preload that the bearings need.

Using two seperate bearings, instead of a double set, opens up the options for the bearings. What do you think.

Harvey.

[Dessertrunner]

Doug, Harvey,
I think your info is good there is a bearing listed by NTN that has the exact size as the current SVX one but I tryed to order it and was told they don't make it any more. My guess is Subaru did intend on using it but then had to change to the lighter one. The width of the bearing I suggest appears to be an issue but infact it isn't because the side load rating in the specs is based on the narrow size. I think there are two better ways to do the mod better, first is to find a set of the same size bearing with the higher load but as yet that has proved impossiable. The second is as you suggested two standard bearings with spacers. The challange with this plan is that you need to be exact with the bushes as they do the preloading if it is not right the bearing will fail. The type and method I used means the preload is done by the bearing and the bushes don't have to be exact. As regards the fact that I live in a flat area is not really an issue as I travel into the snowy mountain quite regularlly and they get a real punishment in fact one time the breaks over heat to the extent that I had none. Also if they couldn't take the side load I wounld not be able to run with bent rims as I do. The trick is the rollers are larger in the one I suggest using. Discussion is good if we all put our heads to this we might even find a better one for the job. Have a good day.
Tony

[mohrds]

I don't think that the spacers will cause any problems. Based on the attached picture, you see that the Axle spindle and the spindle nut force together the two races causing the proper preload. It shouldn't matter that the spacer is in there as long as the material is strong enough.

From the image it is also easy to tell why the improper torque on the spindle nut will cause premature failure.

My main concern is how the seals will fit against the spacers.

Doug