RivetBangers.com

So my nose seal is leaking a very little bit on my engine, so I think it needs to be replaced. However, I cannot find out where to buy one? Are there specific seals unique to each engine, or is this a generic seal?

Mike, hopefully I am wrong about this but you may have to split the case to put a new seal in the front of the engine. Maybe a very experienced A&P can tell you how to do it without a complete tear down!

I'm heading down to the afternoon coffee break, and I'll ask the guys...

Okay, the fella's here are calling it the crankshaft seal...is the leak coming from behind the ring gear? If so, that seal can be changed without splitting the case. There are two types of seals, a split and non-split, and both can be installed by pulling the prop and ring gear.

Oh and to answer your question, should be able to get it from A.E.R.O In Stock. They're probably cheap so I'd get both so you have the right one when you pull the old one.

cjensen wrote:Oh and to answer your question, should be able to get it from A.E.R.O In Stock. They're probably cheap so I'd get both so you have the right one when you pull the old one.

Actually might make sense to get two of each ...

Here's the Lycoming Service Instruction for crankshaft oil seal replacement http://www.lycoming.textron.com/support/publications/service-instructions/pdfs/SI1324C.pdf

Carlos in AZ

On 4/12/2011 11:36 AM, RB Lists - The Hangar wrote:

Okay, the fella's here are calling it the crankshaft seal...is the leak coming from behind the ring gear? If so, that seal can be changed without splitting the case. There are two types of seals, a split and non-split, and both can be installed by pulling the prop and ring gear.



Chad Jensen
EAA Technical Counselor
N755CB|RV-7
RV-7 Build Log
Thatcher CX4 on deck
Hummel Bird plans on the bench


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Thanks everyone for the replies. It seems the difference between the split seal and the solid seal is ease of installation. I'm going with the non-split version of the seal just because I feel it will be better on the long run -- and more of a challenge.

AeroInStock.com does sell the seals. They are $10.49 for seal SL13792. Also, the PLIOBOND sealant is also required. Total should be around $30 for the fix.

Good deal Mike! Let us know how it goes...

Often times, you damage the seal trying get it around the crank flange.

We had oil leaking past that seal on the RV-4 we use to own.
Before we sold it, I replaced it with a split seal.
It was easy to do, and has been leak free for the last 75 hours in 12 months.

Many moon's ago I installed a split seal on a Franklin 165hp with the split at the 10 or 2 o'clock position. Didn't leak all the while I owned the aircraft. Later installed a one piece seal on a lycoming using this piece of advice from an AME (A&P in Canada). He said to soak it in warm oil for a while but don't forget the small retaining spring when you get it over the flange. The spring may be hiding in the seal when you get it, so you'll have to take it off before you soak it in the oil or you'll never be able to grip to un-twist it apart cause it'll be too slippery.
Hope this helps,

Patrick in Calgary