Date: Tue, 25 Jun 96 15:14:05 EDT
From: lubetsky@discovery.mak.com (Benjamin Lubetsky)
Subject: TR6 Vacuum Retard System?
Two months ago I became the proud, if somewhat ignorant owner of a '75
TR6. Being a very inexperienced mechanic I thought I would make my
first project a fairly easy one. The car idled fairly rough and would
miss at low RPMs under acceleration. Following the shop manual I
started my first tune-up. I changed the plugs, set the valve
clearances, and while setting the timing noticed something unusual.
On the distributor I pulled off what I believe to be the Vacuum Retard
hose (the only one there) while the engine was running... and nothing
happened. I checked the shop manual and it says that the engine
should speed up about 500 RPM with this hose removed. I tried
plugging it at the carb end and at the distributor end and still no
change.
So I found the nearest TR6 and tried the same thing. Fortunately the
nearest TR6 belongs to my roomate, JB Zimmerman and is a '71 (the car
not JB), and despite the dashboard being on our kitchen table the car
still started. The distributor looked the same as mine and after I
removed the hose the idle speed immediately increased around 500 RPM.
Then I traced the hose to the carburator and noticed something else.
JB's vacuum hose is attached to a nozzle on the bottom of the rear
carb. On my car the hose is attached to a brass nozzle that has been
inserted into a ~1/4" hole on the top of my rear carb. While JB's
rear carb has the same hole there is no brass nozzle in it. After
checking the bottom of my rear carb for a nozzle like JB's I finally
found it, on the FRONT carb! It had been covered with a rubber cap.
What's going on here? Did the DPO somehow switch the bottom half of
the rear and front carb? What is the hole on top of the rear carb
supposed to be for? How do I fix this?
Any comments, advice, etc. is welcome,
Ben Lubetsky
MAK Technologies, Inc.
lubetsky@mak.com 185 Alewife Brook Pkwy.
(617)876-8085 x1111 Cambridge, MA 02138
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