Everyone,
I've decided to replace the cam after all. With what I have in it,
what's a few more? (Shipwrights Disease, yeah, I know!) Thanks for the
comments from Aaron and Bob.
Glad for the recent thread about engine break-in too. I was wondering
what to do. Thanks for the helpful advise to all.
Cheers,
Gary Klein
'75 TR6
Gary Klein wrote:
>
> Fellow Scions,
>
> I 've started to reassemble my TR6 engine after a tear-down to rebuild
> the bottom end. The block, crankshaft and rods were reworked [new
> pistons (.020 over), mains (.010 over), big and small ends too]. The
> cam lobes look fine (no pitting) and all measure within tolerance wrt
> lift. The journals diameters were within spec as well.
>
> My problem: excessive cam end float.
>
> Upon reasseambly, I measure .018" of cam end float. Bentley's states
> that .004 - .008 is spec and that a new cam keeper should be used to
> bring the float back within spec. I neglected to buy a new keeper when
> I purchased my other engine parts, however, I measure only .003" of wear
> on the old keeper which will not bring the float back to within spec. I
> then examined the groove in the cam in which the keeper rides and
> noticed that the while the rear most edge is perpendicular to the cam's
> axis, the front edge is perpendicular for the same depth that the keeper
> comes into contact with the cam and is beveled from this point down to
> the depth of the cut. Obviously, there has been some wear on the front
> most edge of the cam's journal.
>
> Does this mean a new cam is in order? Any other suggestions would be
> appreciated.
>
> I thought everything was going together too well!
>
> Thanks in advance,
>
> Gary Klein
> '75 TR6
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