Primary drain plug
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Joined: Aug 2017
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From: Uppsala, Sweden
Primary drain plug
I have a -92 FXSTC.
Which size of allen key should be used for removing the primary drain plug?
I've tried 7/32, 3/16, 5/32 and 5 and 4 mm and none of them work...
Which size of allen key should be used for removing the primary drain plug?
I've tried 7/32, 3/16, 5/32 and 5 and 4 mm and none of them work...
Dirt don't hurt
Joined: Jan 2011
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From: Haslet Texas
I'd lean more to the T35.
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From: East Coast, USA
According to the book:
101 Harley-Davidson Performance Projects For Evolution Big Twins And Sportsters
by Kenna Love and Kip Woodring
Copyright: 1998
MBI Publishing Company
This is the infamous #739A drain plug. It's used for both the tranny drain and the primary drain on most Big Twins, and it's been through a couple of changes over the years. The early plug has an Allen head, and frankly, the magnetic tip had a tendency to come loose, sometimes falling into the motor. Second, the plug is a fine thread going into aluminum, therefore, a prime candidate for getting stuck in its hole or stripping out. It's a fine plan to have at least one new one of these on hand during fluid changes. The latest version is a Torx head, with a secure magnet and Teflon on the threads so finger tight and half a twist will keep it secure and hassle free.
3/16" Allen wrench for early model drain plugs
T-40 Torx wrench, for late model drain plugs
FYI: According to the notes in my shop manual, it's a T-40.
But, then there is this information:
101 Harley-Davidson Performance Projects For Evolution Big Twins And Sportsters
by Kenna Love and Kip Woodring
Copyright: 1998
MBI Publishing Company
This is the infamous #739A drain plug. It's used for both the tranny drain and the primary drain on most Big Twins, and it's been through a couple of changes over the years. The early plug has an Allen head, and frankly, the magnetic tip had a tendency to come loose, sometimes falling into the motor. Second, the plug is a fine thread going into aluminum, therefore, a prime candidate for getting stuck in its hole or stripping out. It's a fine plan to have at least one new one of these on hand during fluid changes. The latest version is a Torx head, with a secure magnet and Teflon on the threads so finger tight and half a twist will keep it secure and hassle free.
3/16" Allen wrench for early model drain plugs
T-40 Torx wrench, for late model drain plugs
FYI: According to the notes in my shop manual, it's a T-40.
But, then there is this information:
You might want to take a closer look at it.
The plug part number is 739A which is used on a shitload of primarys.
(All the EVO ones I looked at) and it is actually a T-30 Torx head.
Don't get me wrong you can easily take it out with an allen but it is actually a torx.
The plug part number is 739A which is used on a shitload of primarys.
(All the EVO ones I looked at) and it is actually a T-30 Torx head.
Don't get me wrong you can easily take it out with an allen but it is actually a torx.
Last edited by LQQK_OUT; Nov 22, 2019 at 02:27 PM. Reason: updated post with my factory shop manual notes
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Joined: Apr 2009
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From: Jersey
stripped Torx removal
You could try hammering in a larger allen head either metric or standard using a ratchet.
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From: Brighton, MI
Get a t-45 torx bit and grind it down to a point. In other words, grind a slight taper in the tip of the bit so it is smaller than the rest of it, and tap it in carefully with a small hammer. Attempt to get a good bite and try to back it off. YD
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Joined: Aug 2017
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From: Uppsala, Sweden
Aaand same thing with the one in the transmission...
But that one seem to have been a T40.
But that one seem to have been a T40.
Last edited by JensWest; Nov 22, 2019 at 03:32 PM.
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From: Haslet Texas
Your primary plug and transmission plug are interchangeable.