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FWIW, I flew for about 3 years with the oil injection pump shaft
removed and oil passage to it NOT blocked. I assumed this was a 3/16 open
hole that the oil pressure was bleeding from. I later blocked it and was
surprised that it made little difference to oil pressure at any rpm. Bruce
T. later told me that Mazda stakes a small orifice plug down in the passage way
to restrict the oil flow. I never saw it (didn't look) but my oil pressure
results would seem to support that story. This was a 1988 6 port
engine. Oil flow through this passage does not lubricate the oil pump
chain so that is not a factor.
Tracy Crook
----- Original Message -----
Sent: Sunday, January 09, 2005 8:30
PM
Subject: [FlyRotary] Re: Metering Pump
Blockoff
On 1/9/05 3:55 PM, "Fred Osborn" <fosborn@infowest.com>
wrote:
>> << Hi Lynn,
>> You said that
if the shaft for the oil metering pump is removed, the
>>
pressure oil feed gallery has to be plugged. To do that we must
>>
remove the
>> front housing. How about if we still have the
shaft, can we just
>> pushed in
>> from the outside
(with gear removed) through the shaft opening? Or
>> just
an
>> aluminum rod with tight fit to fill the shaft
hole?
>> I don't have an extra front housing to look at, so I'm
just guessing.
>> Buly
>
>
> Buly,
>
> Quite some time ago there was a lengthy discussion on this subject at
the
> other web site. Yes, plugging is necessary. If you look at the
front cover
> front surface you will see an oil passage leading down and
then across the
> front to just below the outside bump for the shaft.
This feeds
> pressurized oil
> into the necked down portion at the
center of the metering pump shaft.
> If this
> oil passage is not
blocked by a dowel per Tracy's book then you must block
> both the inner
and outer ends of the shaft opening.
>
> Much of the discussion
centered on whether the shaft opening should be
> fully
> blocked
since the hole leading up to shaft from the oil passage
> continues up
to
> the inner surface of the front cover. There it is partially blocked
by a
> roll pin.
> Some felt that this was intended to provide
some "spray" oiling for the oil
> pump chain. If so, then the best
course would be to block the hole with the
> metering pump shaft. You
would have to make certain that the shaft can't
> slide
> back
into the sump. If the "spray lube" is not correct then a rod
> filling
the shaft
> hole end to end would be just fine. Perhaps Tracy could tell
us if he
> has had
> any problems from just blocking the
passage.
>
> Fred Osborn
>
Thanks Fred. Since I
inherited a very nice South Bend lathe, now I can make
an aluminum rod to
fit tight the whole length of the shaft hole. I have also
plugged the small
about 1/8 hole on the outside beside the shaft opening.
I run the engine
today and the oil pressure was fine. But to make sure I'll
do the shaft
"thing" too.
Bulent
>> Homepage: http://www.flyrotary.com/
>>
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