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#755319 11/07/18 2:41 pm
Joined: Nov 2005
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Can anyone confirm the thread of rocker adjusting pin 70-1513 for T120. I have bought a tap which is 26 tpi cycle thread which is what I thought it was to clean up a slightly messed up thread in the rocker arm but it feels a little tight and I didn't want to go all the way through until I was sure that it was correct.
Thanks


1971 T100R
1970 T120
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I have not measured one but, FWIW, a search of the adjuster lock nut - 70-0470 - generally indicates 5/16" 26 CEI.

However, CBS site says 1/4" 26 CEI.

Stainless Bits website database lists it as 5/16" 26 CEI.

I just chatted with CBS and they confirmed 5/16" 26 CEI is correct.


Last edited by henryanthony; 11/07/18 7:38 pm. Reason: Updated information
twinspin #755365 11/07/18 10:48 pm
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Thanks for the info henryanthony
Mike


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1970 T120
twinspin #755369 11/08/18 12:03 am
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Just a note of caution. They were always 5/16". Until about '78 they were CEI (26 tpi). Then changed to UNF (24 tpi).

Rocker arms from all years can be interchanged, though they do have detail differences beyond just the thread change mentioned above. Some of the changes can involve a difference in assembly.

I have worked on one engine where one rocker arm had been replaced by a later one. I only realised this as I was installing a set of Allen key rocker pins, and one wouldn't fit.


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