Re: Warm-Up Valve

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <3.0.3.32.19990326102453.006c8ad0@mortimer.com> ErikM writes:

> Thanks for the many responses regarding what is
> also called the warm-up regulator and the
> control pressure regulator depending on what
> book you refer to.

No.  Although it's essentially the same device, the nomeclature has
meaning.

"Warm-up regulator" means that's all it does.  Its inputs are system
pressure and temperature - the latter partly from the heater (usually
wired in parallel with the fuel pump) and from physical contact with
the engine block.

A "control pressure regulator" is all of the above, but has additional
input (usually a vacuum hose) to add a further dimension to modify
"control pressure".

The key differentiator is the vacuum hose, entering the unit at the
side of the base.  If you have one, it's a "control pressure regulator"
- if not, it's a "warm-up regulator".

Two notes:

a) Both forms have another port that looks like a vacuum port,
   pointing outwards from the top.  This _should_ have a mushroom-shaped
   cap on it with an internal slot to provide airflow.  Don't, for
   heaven's sake, block it off with an air-tight cap.

b) The hoses are attached at torques that are not supported by the
   Allen-head bolts attaching the units to the engine block.  The
   sequence is _ALWAYS_ to detach the unit from the block _BEFORE_
   undoing the hoses.

--
 Phil Payne
 Phone: 0385 302803   Fax: 01536 723021
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