On 9/12/13 7:00 AM, Jonas Payne wrote:
> There had been a series of failed tappet/cam issues with new lifters. Many
> of the new lifters failed to meet the Rockwell hardness test of the ones
> coming out.
>
> The whole ZDDP /Flat Tappet issue happened at the same time. Ultimately, I
> believe it had more to do with the break in lube/oil than the hardness of
> the Tappets, as everybody in the hobby was having the same issue - not just
> the TR guys.
Well, I still returned a bunch of brand new soft tappets that didn't
come close to spec. The factory tappets were over 50 hardness.
And about 2 years ago I had to replace the cam in my TR3 because of wear
and pitting on both the cam & lifters. I had been running Castrol with
no additives. Since then I only use oil labeled for use with flat
tappet engines. All my new tappets tested to 54 or higher.
TeriAnn
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