Today's Message Index:
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1. 07:06 PM - PSRU Main Bearing Oil Leak (RLucka@aol.com)
2. 09:19 PM - Re: PSRU Main Bearing Oil Leak (Bill Morelli)
Message 1
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| Subject: | PSRU Main Bearing Oil Leak |
--> Stratus-List message posted by: RLucka@aol.com
Hi Guys!
Has anyone experienced a small oil leak coming out of the main ball-bearing
in the PSRU that connects to the engine crankshaft?
I inspected my engine today and noticed a small puddle of oil under the
engine and some oil spray all the way around the insides of the top and bottom
cowl
in line with the flywheel. This occurred in the last 2 hours of flying (and
it was a warm evening, too). The oil appeared to be coming from the main PSRU
bearing.
Nothing is mentioned in any Stratus documentation of what bearing this is so
I can get a replacement. Only the prop shaft bearings are mentioned.
The bearing appears to be fine. There is no play. It almost seems like I
should be able to apply some kind of adhesive in the bearing seams to prevent
motor oil from seeping out.
Thanks for any advice you can pass along my way.
Dick (601-HDS, Stratus, 186 hours)
Message 2
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| Subject: | PSRU Main Bearing Oil Leak |
--> Stratus-List message posted by: "Bill Morelli" <billvt@together.net>
What I believe you have is the rear oil seal (behind the flywheel) leaking.
It is pressed into the reduction drive unit and is not the standard Subaru
oil seal.
I replaced mine. I did not have a puddle but did have oil on the inside of
the cowl in line with the flywheel as you describe. I could also see oil on
the aluminum reduction drive housing looking through those large holes in
the flywheel.
If you think you have a leaky seal, let me know and I can send you some
photos on the replacement and part number for the seal (which I purchased
locally). I think the seal was about $21.00 -
One problem with the design that causes this leak is that behind the
flywheel is a spacer that fits inside the seal and actually makes the oil
seal. This spacer was made from black anodized aluminum. The sharp rubber
edge of the seal over time wears a groove in that aluminum spacer. So to
make the new seal last as long as the first, I did not press the new seal
in quite as far as the original. This causes that sharp rubber edge of the
new seal to ride on a different location of the aluminum spacer thus
avoiding the grove that was made by the old seal. I think I have photos of
this grove damage as well.
The proper fix for this would be to have a steel spacer made by a machine
shop to replace the aluminum one. I may do that when this new seal starts
leaking.
The seal on the other end of the engine (front seal) does not have this
problem since the steel pulley is what rides on that seal and does not get
grooved over time. That front seal is a standard Subaru part.
Regards,
Bill
> Hi Guys!
>
> Has anyone experienced a small oil leak coming out of the main
ball-bearing
> in the PSRU that connects to the engine crankshaft?
>
> I inspected my engine today and noticed a small puddle of oil under the
> engine and some oil spray all the way around the insides of the top and
bottom cowl
> in line with the flywheel. This occurred in the last 2 hours of flying
(and
> it was a warm evening, too). The oil appeared to be coming from the main
PSRU
> bearing.
>
> Nothing is mentioned in any Stratus documentation of what bearing this is
so
> I can get a replacement. Only the prop shaft bearings are mentioned.
>
> The bearing appears to be fine. There is no play. It almost seems like
I
> should be able to apply some kind of adhesive in the bearing seams to
prevent
> motor oil from seeping out.
>
> Thanks for any advice you can pass along my way.
>
> Dick (601-HDS, Stratus, 186 hours)
>
>
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