11BL Front Wheel Bearings
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Thread: 11BL Front Wheel Bearings

  1. #1
    Fellow Frogger! citroenthusiast's Avatar
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    Default 11BL Front Wheel Bearings

    Any opinions whether to get ABEC-1 (CN clearance) versus the slightly looser C3 clarance bearings for the type 6207 inner front wheel bearings? The outer bearings are special, so I have to go with whatever comes from the specialist.

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    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

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    1000+ Posts gerrypro's Avatar
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    Is it really that critical John? Any off the shelf 6307 of a good brand will be OK.
    I have never been offered a choice like this and have always gone with what the bearing supply shop had in stock.
    Concerning front wheel bearings, our club had some plain bearings of the correct dimensions machined for the groove. We had a member who worked for a bearing supplier undertake the task. I forget the numbers of the bearing used ----- it was nearly 40 years ago when it was very difficult to obtain the correct bearing as per the parts book here in Australia. Thankfully the situation has improved for access to the world wide market. You have to like the internet for just this reason alone!
    Last edited by gerrypro; 9th April 2019 at 08:27 AM.
    Cheers Gerry

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    Fellow Frogger! Trading Estate's Avatar
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    just check the outer bearing and matching spacers are right size.There were 17 mm and 19mm outer bearings.
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    Hi John
    I have always been able to get the required clearance bearings here in Aus. Sometimes had to order in for next day. The C3 clearance is not an uncommon spec bearing. Commonly used in industry.
    This is the most common reason for a C3. The outer ring AND the inner ring are press fits and thus the internal clearance is reduced below the normal optimum of only one press fit. The second common reason is to improve the thrust capability of a normal ball race.
    https://www.ntnglobal.com/en/product.../2202E_a08.pdf
    Jaahn
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    Fellow Frogger! citroenthusiast's Avatar
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    As I understand it, the C3 bearing spec is also for applications where there may be a thermal gradient (i.e. a cold start followed by heat generated in the bearing that would cause clearances to decrease). Anyway, thanks for the input, I think a normal clearance ABEC-1 is probably what I will go with.
    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

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    Quote Originally Posted by gerrypro View Post
    ...
    Concerning front wheel bearings, our club had some plain bearings of the correct dimensions machined for the groove. We had a member who worked for a bearing supplier undertake the task. I forget the numbers of the bearing used ----- it was nearly 40 years ago when it was very difficult to obtain the correct bearing as per the parts book here in Australia. Thankfully the situation has improved for access to the world wide market. You have to like the internet for just this reason alone!

    For what it's worth, the outer wheel bearings would have been standard 6306 NR bearings if only the stub axle had been 30mm instead of 32mm. What makes the bearing special is the nonstandard inner diameter. You can find 6306 NR bearings everywhere. You can't find 6306-32 NR bearings anywhere except Citroen suppliers to my knowledge.
    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

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    John, When I repurchased my first traction after selling it 15 years earlier (5 years ago) I gave it a thorough going over .To my surprise it had an off the shelf std slotted outer bearing with about a 0.5. / 1mm thick sleeve inserted in the inner hole. I knocked these out and placed them in new bearings. So the internal diameter of the bearing was approx 33 / 34mm. As I am away at present and not home I do not have access to the number. My local bearing distributor though is great as I gave him the ext / int diameters and thickness and he found them easily. This may be a solution if you have access to a machine shop to make a sleeve. Hope this may help. Robin
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    Fellow Frogger! citroenthusiast's Avatar
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    Robin. I am guessing you installed a 6207 NR bearing. This can be accomplished if you put a 1.5mm thick sleeve over the shaft, since a 6207 has a 35mm bore and fits inside a 72mm bore. The 6207 is however a lighter duty bearing than the 6306.

    Ultimately, I did find the proper 6306-32 NR bearings from Brad Nauss Auto here in the states. They were fairly pricey at US$71 each. The inner bearings were bog standard size 6207.
    Last edited by citroenthusiast; 10th April 2019 at 12:42 PM.
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    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

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