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Re: [TR] Cam timing for 1974 TR6

To: "'old dirtbeard'" <dirtbeard@pacbell.net>, <triumphs@autox.team.net>
Subject: Re: [TR] Cam timing for 1974 TR6
From: "Randall" <TR3driver@ca.rr.com>
Date: Sun, 5 Feb 2012 17:49:37 -0800
> "With the crankshaft at TDC, set valve clearances for the #11 
> and #12 valves to 
> .120", oscillate the cam a few degrees so that valves eleven 
> and twelve are on 
> the 'rock,' whilst checking both valve clearances with two 
> feeler gauges of the 
> same value.  When clearances are the same, the camshaft and 
> crankshaft are in 
> their correct relationship."

There is a 180 degree cam rotation missing somewhere in there.  For the
initial clearance setting, both lobes must be on the base circle (eg #6 at
TDC on compression).  Then for checking the cam position, both lobes must be
on overlap (ie #6 at TDC on exhaust).

The method also depends on the camshaft having symmetric overlap.  The
factory cam does; but some aftermarket cams do not and must be timed by the
more tedious methods.

-- Randall  

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