Early Corvairs 1960 through “First Jobs” 1963 engines use a shorter blower bearing hub (1.5″) with a black plastic cap. Very early in the 1963 production the bearing and hub were changed to a 2″ tall model and the black plastic cap eliminated. This second bearing hub continued through the end of 1964 production.
Here are some numbers:
6255864 – 1.5″ tall Bearing Hub (1960-early 63)
6257938 – Hub Bearing Cap (1960-early 63)
907292 – Bearing and Shaft Assembly (1960-early 63) (was originally 907175 for 1960-61)
3826474 – 2″ tall Bearing Hub (later 1963-1964)
907448 – Bearing and Shaft Assembly (later 1963-1964)
It should be noted that the 1960-1963 Assembly Manuals show the Hub Bearing Cap, but it is clearly indicated in P&A Manuals that the cap was only used on the short bearing hub which was only used on “1963/ALL FIRST JOBS”, so it’s safe to say that only the earliest 1963s used the cap. We don’t know the exact date of bearing changeover, however.
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- the short bearing on the left is wearing the dust cap
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- Short in front
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- short on right — no dust cap
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- Short in front
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- top view
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- Side view
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- Underside view
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- Underside view
