C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

[Richard M.]

The following New Departure numbers on a nos set I have for the front outer wheel bearing is:

909701 bearing (10 ball bearings)
909601 inner cup
909501 outer cup
The above bearing assembly by the book is pt# 909067.

I have another nos set:
909767 bearing (9 bigger ball bearings)
909667 inner cup
909567 outer cup
I'm not sure what the above assy # is?

Both sets have the identical depth dimensions, apx 0.700".

The x67 set is a smaller assembly has a smaller inner cup and appears to be a lesser design, however the ball bearing diameter is bigger & has only 9 of them. That is the set that was in the hub of the 59 I'm restoring. I need to replace the set, but the cage for the bearing was destroyed somehow prior to removal, likely overheating due to lack of lubrication. Or maybe it was just the wrong bearing!

Were the x767 bearings a problem? Is this the wrong bearing for Corvette?

Example set from CC: x01set

Advice?

Rich
p.s. it is confusing why the x01's have the assy #909067, yet the "x67" set I have uses the same "67" suffix???

[Richard M.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

Trying again......

[Bill M.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

I have a spare set of early (w. rivet holes) hubs I bought in 1975; they have 9 balls in the outer bearing.

I checked the bearings in my '59. I'm sure they got replaced before 1977; I had some deep dish mags that trashed the wheel bearings. They are also 9 balls.

[Richard M.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

Bill, Thanks....

Interesting......these 909767's's have 9, where the books call out for the 909701 which have 10. Maybe the 909767 was a better service replacement bearing? I can't seem to find reference in my books anywhere. My 29-59 Chevrolet Pass/Truck & Corvette, 53-72 Corvette, and 53-78 Corvette P&A books all call out the assembly 909067 which is the 10 ball x01 version.

Maybe if Joe Lucia sees this he may have the answer.

Rich
p.s. I can't help but think something that should be so simple is becoming more and more complicated to me.

edit: Ok I think I found something. The 29-59 P&A book shows individually in Grp#'s..... 6.315 909567 cone, 6.317 909667 cup, and 6.319 909767 bearing, as 2nd Design used for Corvette & 1/2 Ton Trucks. The late P&A books never list them separately even though the reference says it does.

So now another question may be........why are the parts suppliers selling only the first design x01's, when they should be selling the 2nd design x67's.

[Bill M.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

edit: Ok I think I found something. The 29-59 P&A book shows individually in Grp#'s..... 6.315 909567 cone, 6.317 909667 cup, and 6.319 909767 bearing, as 2nd Design used for Corvette & 1/2 Ton Trucks.

Rich:

The hubs were upgraded for the '59, maybe the bearings were too?

Bill

[Richard M.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

Bill, Good catch.....I just checked the 29-59 P&A book........

Yes I see hub Grp# 6.307 is 3694757(cast 3694757) for 53-59 Pass & Corvette. Could be a typo. Maybe it should have read "53-58". Maybe the hub changed in 58?

then later in the list, "58-59 Corvette w/909067" 6 1/8 O.D. is 3752666. But 909067 is the x01 set, which is the 1st design 10 ball bearing assembly.

Still confused, but I'm not giving up yet!

Rich

[Bill M.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

Yes I see hub Grp# 6.307 is 3694757(cast 3694757) for 53-59 Pass & Corvette. Could be a typo. Maybe it should have read "53-58". Maybe the hub changed in 58?

Rich

The '72 P&A book shows the '53-'62 hub as 3775686 (forged). That must be the upgrade to the hub...forged instead of cast.

My early '59 has the upgraded hubs; they are original to the car.

[Richard G.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

Don't get to concerned on the number of balls in the bearing. Today if you call, say SKF, and want to know the number of rolling elements in a specific bearing they will need to have the manufacture's country code and date code from the race to tell you the number of rolling elements (balls in this case). Only thing you have to know is more balls is better from a load carrying prospective.

Although this is likely not necessary true from a teenager's prospective.

In the past manufactures made a conversion bearing that converted the angular contact ball bearing to the more modern taper rolling element design. I am not sure if these are still available or not. The angular contact ball bearing is a adequate design especially when using stock size wheels.
Rick

[Richard M.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

Rick,

So the 909701 1st design has 10, the 2nd design 909767 has 9. I understand your statement about the quantity per bearing, just seems odd that the 2nd design would have a lesser load capability.......would you agree with that?

Friday afternoon I stopped by a bearing supply business in Vero Beach and they looked up their old Federal Mogul automotive reference and it listed the B01 as the correct bearing assy. They had one "B01" set in stock. It was nos in a box dated 1985, Federal Mogul-Bower|BCA. I'm planning to use this bearing as the replacement.

Rich

[Richard G.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

Rich
My guess it the later design could be found with both rolling element counts. They just don't keep that close of tabs on it, at least from my prospective. Doesn't it seem all later designs are less expensive than the original? Save one rolling element per bearing, times a million, is money in there pocket... BTW the old style bearing will last longer than ever it before because the grease is vastly improved over the stuff from decades ago. Glad you were able to find this bearing.
Best of luck
Rick

[Bill M.]

Re: C1 Front Wheel Ball Bearing ND# 909701 & 909767 ?

Rich
My guess it the later design could be found with both rolling element counts. They just don't keep that close of tabs on it, at least from my prospective. Doesn't it seem all later designs are less expensive than the original? Save one rolling element per bearing, times a million, is money in there pocket... BTW the old style bearing will last longer than ever it before because the grease is vastly improved over the stuff from decades ago. Glad you were able to find this bearing.
Best of luck
Rick

Rick:

It's my guess that the later bearings were used with the later hubs. I vaguely recall that the later hubs were strengthened due to racing. Racing would cause a very large side load on the hub, and increase the side load on the outer bearing. Maybe there was an increase in side load performance with the later bearing?

Of course, if the early bearing was adequate to handle the racing side loads, a cost reduction makes sense!

Bill