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Date: Sun, 09 Jan 2005 20:30:47 -0500
Subject: Re: [FlyRotary] Metering Pump Blockoff
From: Bulent Aliev <atlasyts@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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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