Thanks for the photo. I do have the same manifold as your TR3B but it
is not tapped and plugged as yours is. From what I've read, worn
guides will cause a noticeable fluctuation of vacuum at idle.
Compression in #1 is higher than 2, 3, 4 (172 lbs. / 165 lbs.) which
may be due to carbon build up. I haven't tried but can you wiggle the
stem with the spring in place??
Allen
On Jul 6, 2012, at 4:31 PM, <bill_beecher@flash.net> wrote:
Maybe I'm all wet but what test would help you to isolate the #1
hole valve
guides by tapping a fitting into the balance tube? If I suspect
that I have
a valve guide problem, a good wiggle test will usually show it with
out
having to pull the head.
Any reason not to suspect that you might have a broken or frozen ring?
Bill
-----Original Message-----
From: triumphs-bounces@autox.team.net
[mailto:triumphs-bounces@autox.team.net] On Behalf Of Allen Hess
Sent: Friday, July 06, 2012 2:10 PM
To: "triumphs list"
Subject: [TR] TR4 vacuum port
I've had occasional but persistent oil fouling of the #1 plug for a
few
years and a hotter plug in that cylinder has helped. Symptoms point
to worn
valve guides. I was going to get a vacuum gauge and try to do some
more
diagnosis. However, I don't have any manifold vacuum port other than
the
advance line in the carburetor. And I'm not sure that would work as
it lies
beneath the throttle plate.
The intake manifold has two bosses cast into the balance tube which
certainly looks like Triumph was thinking about this but it would
have to be
drilled and tapped. Anyone else been down this road?
Allen
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