Hi Don
With the Triumph Engines, (I think with the exception of the Sprint) the
rockers on the rear cylinder (no4 or no6) should be equally placed, ie down
by the same amount, (or on the rock!) when the crank is at top dead centre.
This may not apply if you have a non standard camshaft that is set either
advanced or retarded, you would be able to see this as a small difference
from TDC at the crank. You do need to know whether your cam is standard, or
safe to assume it is.
Graham,
1967 1300 FWD
1968 2000 Saloon
1972 2.5PI Saloon
1974 Sprinted Dolomite 1850
1975 Toledo in restoration!
http://www.triumph-iw.co.uk
http://www.mickdolphin.co.uk Spares Supplier.
----- Original Message -----
From: "Don Clark" <d@seanet.com>
To: <triumphs@autox.team.net>
Sent: Friday, March 09, 2001 1:18 PM
Subject: TR6 Cam Timing Question
>
> Hello everyone,
>
> Thanks to everyone for helping me with my question regarding finding out
if TDC
> was marked correctly on the crank pulley. I used a piston stop and found
that
> it was.
>
> I am trying to figure out why my 72 TR6 runs best with a lot of extra
advance.
> It seems to run best with about 20 degrees of extra advance at idle. That
is if
> I set the distributor to the stock setting for idle the car doesn't run
very
> well at all (low power, unwilling to rev). But if I advance the
distributor
> about 20 degrees or so it seems to run fine. The car has been like this
since I
> bought it a little over a year ago.
>
> I plan on pulling the distributor out to take a look at the springs and
see if
> everything looks ok there tonight.
>
> However, I would also like to check to see if the cam timing is correct. I
just
> want to make sure that the cam is close to where it should be and don't
want to
> have to use a degree wheel to do this since the engine is in the car and
the
> fan is bolted to the crank.
>
> My question is: Is there a valve that should be fully open somewhere near
the
> number 1 pistons TDC. If so which one is it and how many degrees should I
read
> on the pulley when it is?
>
> I figure this way I can just check the reading off of the crank pulley to
> confirm that the timing is or is not correct before I do anything drastic.
>
>
> Thanks again,
> Don Clark
> Seattle, WA
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