On Aug 22, 7:58 am, Charles Vincent wrote:
Dale Scroggins wrote:
How did the first A&P
set the timing; could he see the prop flange markings, or did he use a
timing wheel? The wheels can be inaccurate if improperly set up or if
the pointer friction is excessive.

I used to have a nifty device that installed into the plug hole on the
number one cylinder. It had a probe and a set of cards(each had marks
for several engines) that installed on it that would directly read the
cylinder position. The device was entirely mechanical and had a very
well made wooden box for a case. I inherited it and sold it years ago
since I wasn't likely to ever work on an R-2800 (most of the cards were
for big radials, but lycoming and continental were well represented as
well) I expected that it was probably standard kit for A&Ps

Charles

They're called Timerite and are still available but quite pricey.