[TR] Vacuum Leak

[wbeech]

Terry,

You should definitely feel the suck, remember the manifold is cross-connected so you would have to cover both openings at the same time.   Have you tried shooting a little starting fluid into the carbs to see if it will try to start that way?  I know this sounds dumb, but is the rotor on and seated correctly?(BTDT)

Keep chasing you will find it.

 

All the best,

Bill

 

From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of TERRY SMITH
Sent: Friday, May 31, 2019 3:16 PM
To: triumphs at autox.team.net
Subject: [TR] Vacuum Leak

 

Randall was right.  I did have multiple problems.  Closer inspection of the ground in the distributor plate showed it was connected and tested fine with an ohms check, but in truth was hanging on by just a few threads.  Fabricated another and now spark is exceptional out of the wire.  Don't ask me how I know that but if you'd like a recommendation of the type screwdriver to test the wire to ground, I can tell you which kind NOT to use.  

 

So...the 3 has spark to the plugs and has fuel to the carbs.  Engine cranks but won't catch.  Rechecked float specs and they're good.  Reset richness to 12 flat start-up specs.  So good.  Ran a timing light to see if it had jumped time, tested good.  

 

I'm now suspecting a severe enough vacuum leak to keep the gas from being sucked into the chambers.  Checked valve lash, no issues.  Compression test shows 90 plus in all cylinders.  I can't see the intake manifold gasket on the bottom, but that's where it would be...if it is.  

 

Question:  with the carbs off and using the solenoid to crank the engine, how much should one feel suction against ones hand at the ports of the intake manifold?  I'm barely feeling any if at all.  Certainly not enough to draw gas in.  

 

Thanks, everyone, for your patience!

 

Terry Smith, '59 TR3A  TS 58667

New Hampshire

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