flyrotary@lancaironline.net Mailing List Archive

The side housings are 86-91 irons.

The plug is present on the pan side to fill the galley after connecting the ports with a drill.

I can take either of the allen plugs out of the iron, but then getting a suitable fitting may be a problem.

My guess is that the plug is 1/4 20. 1/4 20 to an4 adapters also have an o ring or crush washer seal. I'm not sure I like the idea as the pad-ectomy site is not exactly a precision machined surface. I also have concerns that this fitting will be fairly restrictive as well.

At this point if I wanted to tap the site for a larger fitting on a complete assembled engine-- I'm asking for trouble.

My planned oil cooler line will leave the front housing, enter a remote filter, leave the filter enter the cooler, exit the cooler and flow back into the rear iron in the stock location.

How about this.... take the PSRU oil from the remote filter housing which will be mounted to the front PSRU plate?

I can tap that for 1/4 to -4 fitting and then have short, simple lines. Is there a problem with this approach?

Mailing List flyrotary@lancaironline.net Archived Message #61756

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From:	Kelly Troyer <flyrotary@lancaironline.net>
Subject:	Re: [FlyRotary] Re: PSRU oil supply and drain
Date:	Thu, 7 May 2015 11:34:40 -0500
To:	Rotary motors in aircraft <flyrotary@lancaironline.net>

Bill,

Need a little more info about your engine........ I presume it is based on a 86-91 iron side housings.........If so your oil inlet to the engine

probably enters the bottom of the rear hsg (front in AC) from an external oil filter..........Since your stock oil filter pad is plugged your

rear iron was probably modified in the same method as my 88 engine........My stock oil filter pad has been totally removed and the inlet

and outlet to the filter pad have been plugged like yours..........If this is done than no oil can get to the main and rotor bearings unless

another modification is done..........There is a brass plug on the bottom (pan surface) of the rear hsg that has to be drilled out and a 12

inch (7/16" drill bit if I remember correctly) used to drill out the wall separating the inlet and outlet ports (they intersect at an angle) on the

oil filter pad which are then plugged..............The way to find out for sure this was done on your engine is to look at the pan surface of

your rear hsg directly below the filter pad area for what is probably a 1/4 inch allen head pipe plug instead of the stock brass plug.........

If you can get the plugs out of the filter pad you can use one to the turbo and the other to the gearbox but like Bobby said I would not

use a "T" fitting for a common feed to the PSRU and Turbo (Too restrictive).............FWIW

Kelly Troyer

On Thu, May 7, 2015 at 5:22 AM, Bobby J. Hughes <flyrotary@lancaironline.net> wrote:

Bill

A picture would be helpful. I can't think of a reason the oil pad would plugged. Dry sump? I think the gearbox needs its own feed line. I think some else shared the PSRU/turbo feed for a few hundred hours but decided it caused inadequate oil flow and wear to the gearbox.

Bobby

Sent from my iPad

> On May 7, 2015, at 12:29 AM, William Mason <flyrotary@lancaironline.net> wrote:
>
> Hello all,
>
> I am plumbing the PSRU for both supply and drain.
>
> My rear iron has been modified by Bruce Turrentine-- so I can't use a spacer between the filter and the pad to create an oil supply for the PSRU but plan to-- with the group's consensus-- use a T in the line that would normally feed the turbo alone from the front iron. The feed and return to the filter pad have been plugged by what seems to be threaded plugs with allen heads. I tried to gingerly remove the feed one and abandoned the idea as it seemed to be very well seated. I did not try heat and I could have. Maybe I should revisit the idea?
>
> I did not buy the engine from Bruce-- instead I sourced it second-hand. I don't personally know Bruce and I'm not sure how he'd like to have me pick his brain on this matter. I figured I'd leave him alone.
>
> I am using a journal bearing turbo and I am running a restrictor at the turbo oil inlet. I would then use a t fitting and branch off for the PSRU feed.
>
> My plans are to use a spacer between the oil pan and the oil level sending unit and tap it for a fitting... the drain then would enter the same space that the oil level sender occupies in the pan... make sense?
>
> Does anybody see a good reason not to do either of those?
>
> I'm down to plumbing and wiring now. Head scratching is becoming more common in my shop routines.
>
> Please advise.
>
> Regards,
> Bill Mason
>
> Sent from my iPad

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