I am going to use Vance's trick below to find TDC on my engine
(replacing the timing chain). Does anyone know what the threads are
for the spark plug holes? They are either 9/16" or 14mm from what I
can tell. I'm not sure which however, and I really don't want to mess
up the threads!
Tim Holbrook
1971 TR6
--- "Navarrette, Vance" <vance.navarrette@intel.com> wrote:
> From: "Navarrette, Vance" <vance.navarrette@intel.com>
> To: "'tr6taylor@webtv.net'" <tr6taylor@webtv.net>
> CC: "'6pack@autox.team.net'" <6pack@autox.team.net>
> Subject: RE: Top Dead Center
> Date: Wed, 8 May 2002 07:30:01 -0700
> Reply-to: "Navarrette, Vance" <vance.navarrette@intel.com>
>
> Dick:
>
> There is a way to do it with no teardown.
>
> 1. Remove all the spark plugs
> 2. Insert a 3-4" bolt with the same threads as the spark plug into
> the #1 cylinder
> 3. Rotate the crank clockwise until the bolt stops the crank. Mark
> the location of the
> timing pointer on the crank pulley.
> 4. Rotate the crank counter clockwise until the bolt again stops the
> crank. Mark the location
> of the timing mark on the pulley.
> 5. TDC will be exactly halfway between the two marks you made.
>
> You will probably want to play with how far you insert the bolt. You
> want the crank to stop
> within 10-20 degrees of TDC both times for maximum accuracy.
>
> Vance
>
> -----Original Message-----
> From: tr6taylor@webtv.net [mailto:tr6taylor@webtv.net]
> Sent: Tuesday, May 07, 2002 11:53 PM
> To: gln@worldpath.net
> Cc: 6pack@autox.team.net
> Subject: Re: Top Dead Center
>
>
> Nick---Triumph Repair Manuals show how to do find TDC properly, and
> if
> you're building a killer engine and need to know exactly where it is,
> it's best to follow the proceedure. IF all you want to do is see if
> it's
> close enough to use the crank pulley timing marks, some teardown is
> necessary. The key in the crankshaft will be straight up at TDC. If
> you
> want to go so far as to remove the head, TDC can be found with a
> degree
> wheel and a dial indicator on top of #1 or #6 piston, as explained in
> the Bentley Book.
>
> Do you have a reason to believe yours is not accurate?
>
> Dick
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