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Date: Sun, 09 Jan 2005 21:28:27 -0500
From: Finn Lassen <finn.lassen@verizon.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Metering Pump Blockoff
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There is no reason to not block the hole completely.

The chain gets all the needed spray from the tiny hole in the oil pump.

Finn

Fred Osborn 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
>
>
>
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>>
>