May 10, 1960
Bulletin No. SB-780
SUBJECT: PINION BEARING, 75 H.P. SERIES ENGINES.
Two different pinion bearings and spacers are used in the production of the 1960 V-4
engines. These bearings and spacers are easily recognized because the Torrington
bearing is almost 1/4 inch longer than the Hyatt. Also, the longer Torrington bearing
has caged rollers while the short Hyatt bearing has free rollers, figures 1 and 2.
To use bearings of unequal length, different sized spacers are matched with the bearings
so the total overall length (or height) of each bearing and spacer assembly is equal.
The long Torrington bearing is matched with the thin spacer, part #307816, figure 1. The
short Hyatt bearing is matched with the thicker spacer, part #307815, figure 2.
Only the short Hyatt bearing and matching spacer are available for service as assembly
part #378247, figure 2. Always order by this part number when a replacement bearing is
needed. Do not order 377873 as it is no longer serviced.
If only a spacer is needed, first determine which bearing was installed in the engine
and then order spacer 307816 or 307815 to match accordingly, figures 1 and 2.
INSTALLATION NOTE: The free-roller Hyatt bearing contains a plastic insert which serves
only as a temporary roller retainer to prevent roller loss in handling and shipping,
see arrow, figure 2. This plastic insert must be removed after bearing has been
pressed into place. Exercise care in removing the insert and installing the pinion
shaft to prevent dislodging and possible loss of rollers. The rollers are coated
with grease which should hold them in position until the pinion shaft installation
is completed.
(over)
