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Re: TR4 A Oil Pressure & vaccuume line question

To: "Bruce Robertson" <mrmomo.geo@yahoo.com>, " TR list" <triumphs@autox.team.net>
Subject: Re: TR4 A Oil Pressure & vaccuume line question
From: TeriAnn Wakeman <twakeman@cruzers.com>
Date: Wed, 18 Jul 01 11:39:50 -0700
>Hello, I seem to have a problem with my oil pressure.
>My shop manual says that while driving at speeds over
>30MPH oil pressure should be between 65-75psi I am
>running at about 45psi. Is this going to hurt my
>engine? and why am I low (is this a gage problem?) at
>idle I get about 15psi (which I assume is normal)

It should not hurt the engine.  Though it is indicating one or more of 
several things:  sear in the pump, wear in the bearings, oil pressure 
regulator worn or improperly adjusted.  

Try adjusting the oil pressure regulator to see if you can boost the 
pressure a bit. The instructions are in the workshop manual.

>Q#2 what does "the" vaccuume line that runs from the 
>carbs to the distributor do???

Your distributor has two advances, a mechanical (activated by centrifugal 
force acting on weights and springs) and a vacume advance.  The hose 
connects the vacume advance unit to an opening behind the butterfly of a 
carb.  

Your engine creates a vacume and a hose to the distributor sucks the air 
from one side of a diaphragm moving the plate the points sit on.  A crack 
in the hose or a plug can defeat the vacume advance.  A crack in the 
diaphragm can as well.

A Mity - Vac is useful for testing this circuit.

TeriAnn Wakeman               Marigold Ltd.
Santa Cruz, California        Web design, site updating, testing
webmaster@overlander.net      search engine optimization, graphics
                              and more

http://www.overlander.net/Marigold/index.html

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