[TR] TR3/4 tappets

Jonas Payne jagmog at hotmail.com
Thu Sep 12 08:29:04 MDT 2013

I used this standard on my last 3 TR3/4 rebuilds (2 morgan, 1 TR3) and
haven't had any issues either, but use a ZDDP additive.  

Good insurance, and easy to test for, but I have to admit that I am curious
as to which issue was driving the failures (a combination of the 2?)

Jonas Payne
PBR Consulting

-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of TeriAnn J. Wakeman
Sent: Thursday, September 12, 2013 7:13 AM
To: triumphs at autox.team.net
Subject: Re: [TR] TR3/4 tappets

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.


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