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ACRO E-mail Archive Thread: [Acro] RE: Lycoming 540 crankshaft bolts

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ACRO E-mail Archive Thread: [Acro] RE: Lycoming 540 crankshaft bolts


Thread: [Acro] RE: Lycoming 540 crankshaft bolts

Message: [Acro] RE: Lycoming 540 crankshaft bolts

Follow-Up To: ACRO Email list (for List Members only)

From: "autotech at" <>

Date: Tue, 10 Dec 2002 17:42:07 UTC


  More good news regarding Lyc IO540 bolts.

I was doing research on my bolt this weekend and came across the following:

My rebuilder has an original Superior logo'd parts bag, still heat sealed. 
Marked on the outside is "STD-2209", NOT "SL-STD-2209".  Inside is a silver
color bolt that does NOT have "SL" stamped in the head.

There is a Superior Airparts bulletin that says that ALL of the bolts they
have sold are exempt from the AD, and goes on to talk about how their bolts
are gold in color, and have an SL stamped in the head of the bolt.  My
rebuilder spoke with them earlier and they would not admit to having bought
and resold and original Lycoming bolts.

The Lycoming AD (one of them anyway) mentions that the affected bolts are
gold in color, and that Cad plating results in a silver color.  The
Superior service note remarks that color is not correctly indicative of the
type of plating, and a later Lycoming bulletin admits this.

Soooo.  Having a bolt from Superior or may not mean that it is a safe bolt,
but it might be that it is a legal bolt if the sales invoice shows
"SL-STD-2209" as the part number.

Oh what to do...

I think I know...


Original Message:
From: Ian Scott ian.scott at
Date: Tue, 10 Dec 2002 18:16:20 +0100
To: acro at
Subject: [Acro] Lycoming 540 crankshaft bolts

Does anyone have a good source for the crankshaft bolt kits (O5K19987) which
need to be used to replace the dodgy bolt Lycoming put in my engine.

There seems to be a shortage over here in Sweden with delivery times not
looking good.



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