[DeTomaso] Front Cam Bearing
JDeRyke at aol.com
JDeRyke at aol.com
Fri Feb 4 14:57:31 EST 2011
In a message dated 2/4/11 10:05:48 AM, chance.dorsey at yahoo.com writes:
> Does the .003 to .005 space create a restriction to the amount of oil
> that goes between the bearing and the face of the thrust bearing?
>
No- the thrust plate surface gets oiled by whatever leakage goes fwd
between the #1 bearing & cam journal. On the right side of the #1 cam bearing bore
is a tiny 'scallop' in the casting that leads to a small drilled passage
for oiling the base of distributor drive gear where it touches the block. If
you set the #1 bearing flush with the outside, this passage is effectively
covered and little or no oil goes to the gear interface. Ford says 0.003" but
anything up to about 0.010" works fine.
The other thing of course, is to have the main camshaft oil feed hole up
from the crank clear, as well as the side passage to the cam gear where it
intersects the distributor drive gear. The block oil passages are 2-3X larger
than the holes in the cam bearings, so there's some variance possible. Years
ago I traced out all this and published an 'oiling map' of the unbelievably
complex oiling system in the standard 351-C block, that showed all the feeds
and passages. But I neglected to specify the #1 bearing set-back amount.
Its also pretty easy to install or adjust the bearing positions by using a
mandrel sized for each bearing, with a threaded hole and a long threaded rod
that runs to the back (or front) of the block. By progressively tightening
a nut on the rod against a washer across the block, the bearing can be
slowly pulled into place. Much more precise than trying to calibrate hammer blows
driving the bearing in place.
Machinests don't like fooling with 351-C cam bearings 'cause all 5 are
different sizes, meaning you need 5 different mandrels to install them, and 5
different set-ups if a few need honing after installation of new ones. But
your #1 bearing should be OK as is. Good luck- J DeRyke
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