[TR] TR3 Timing question

Alex & Janet Thomson aljlthomson at charter.net
Thu Feb 28 15:55:37 MST 2019


I'm a little puzzled here. If the distributor was installed several teeth off, isn't the only thing that will do is change the position of the distributor body, and hence, the secondary towers of the cap in relation to where they used to be? Spark has to occur somewhere near TDC for the engine to start. Engines with helical cut teeth on the distributor gear can be installed in any position. The only issue is that the tower marked #1 may no longer be connected to #1 cylinder. I am not familiar with timing marks on those engines. Are they on the front pulley or the flywheel? If they are on the flywheel, don't most flywheels have an offset bolt pattern and/or a dowel pin that would prevent incorrect positioning during re-installation? Sorry for jumping in without fully researching.

Alex Thomson

-----Original Message-----
From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of Andrew Uprichard
Sent: Thursday, February 28, 2019 11:31 AM
To: 'Wbeech at flash.net'; 'Randall'
Cc: Triumphs at autox.team.net
Subject: Re: [TR] TR3 Timing question

I think Randall's point was, you could have installed the pulley wrong:  the hole should be opposite the slot for the woodruff key.

Could you have gotten the distributor drive one tooth out where it engages the cam?  If   that is the case, it is fairly simple to correct - or you can leave it as it, just bearing in mind the timing will always look wrong.

Andrew

-----Original Message-----
From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of Wbeech at flash.net
Sent: Thursday, February 28, 2019 9:39 AM
To: Randall
Cc: Triumphs at autox.team.net
Subject: Re: [TR] TR3 Timing question

Thanks Randall, 
40° was just a guess, the mark is about at the 2:00 position.  I am using the hole in the pulley as the TDC mark, there is also a file mark there.  

I turned the dizzy clockwise until it started to stumble, then brought it back to the best smooth RPM position.   First road test was great, compression at 175 across 4.  Can I leave it there?  If not, what should I be looking for?

Bill



Sent from my DynaTAC 8000X

On Feb 28, 2019, at 1:40 AM, Randall <TR3driver at ca.rr.com> wrote:

Sounds to me like your TDC marks are wrong.

If the issue is the front pulley being assembled wrong, it would be off by
60 degrees, and so you're still about 20 degrees fast.  That is likely to be
an issue.

40 late isn't going to work well either.

> Had set the dizzy to open with the marks at TDC, not 
> happening.  So I advanced it a whole bunch till the car would 
> start.  Put a light on it and, by the marks, it looks like 
> 40° retarded at a nice smooth idle and the dizzy is in a very 
> normal position.   How does that happen?   Is the only fix to 
> pull the front of the engine and relocate the hub?
> 
> Will it hurt anything to drive it as is?


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