On the verge of buying new main bearings for a 650SS engine.
I have read a lot of info on the forum regarding the main bearings and have decided to go for the following:
Drive side FAG NJ306E
Timing side BL306 (11 balls)
Now, do I go for the Standard or C3 versions?
Over to you fine people to help me out on this one, please...
What clearance are the old…
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My thought would be, how…
My thought would be, how tightly are the bearings gripped by the housings ? . I had to reduce the outer diameter of a box bearing to allow the bearing to spin freely . The old bearing that came out was in just as tight. Its well known that the Factory had issues with old machinery. I could have ordered a larger clearance bearing of course. I think oversize bearings are possible to cope with slack housings. Should we be measuring the housings ?.
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Expansion when hot.
Hello Robert,
I believe the C3 bearings have a little more radial clearance to take up expansion on hot running engines /machinery.
Norton provided the later larger capacity machines with the so called "superblend" roller bearings for other issues. These seem to be available in both standard and C3 clearance.
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What clearance are the old bearings?