Outer Primary Cover
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Elite HDF Member
Joined: Mar 2006
Posts: 4,722
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From: Biddeford, Maine
Outer Primary Cover
My drain plug threads and one of the threads for the derby cover screw are stripped out..........so I either need a new outer cover, or can I retap those threads and get a bigger drain plug and screw?
This is on my 2005 FLHTCUI..........anyone have experience dealing with this issue?
Any ideas?
I found an outer cover on Ebay, but if I can do something with mine that would be great.
Thanks,
Steve
This is on my 2005 FLHTCUI..........anyone have experience dealing with this issue?
Any ideas?
I found an outer cover on Ebay, but if I can do something with mine that would be great.
Thanks,
Steve
Road Master
Joined: Aug 2005
Posts: 761
Likes: 124
From: College Station TX
On the drain plug, just go with the next bigger size and tap it out. You can even go metric to just go a little over. I don't get the derby cover. If your talking about the primary cover just use a heli-coil.
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Elite HDF Member
Joined: Mar 2006
Posts: 4,722
Likes: 5
From: Biddeford, Maine
Drain plug is in the outer primary on the 2005...........horizontal right under the derby cover.
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Elite HDF Member
Joined: Mar 2006
Posts: 4,722
Likes: 5
From: Biddeford, Maine
So I guess my next question would be, where would I get the next size up drain plug?
And what size would that be?
And what size would that be?
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From: Honah Lee
My 2004 has a tapered pipe plug in it. Book says it's an MS, not sure when it got changed. However, I think you'r is a MS plug. It does not seal on the face. It seals in the bevel. You cannot repair that with a helicoil. The insert esge will not seal with an o-ring. However, if you have enough face, it could seal with a flat gasket. Problem is, then it's hard to keep things from loosen on a shaky Harley. That is why Harley uses MS plugs They torque on the face tight and seal in the bevel. You also have one stripped on the Derby. I would replace it. I would not use a torque wrench for seals. Run them up and just bump them. They will not get loose. If you use a torque wrench, the steel threads and oil in the aluminum is really way over torqued. The first is how the MS system works. The is a repair that caused all kind of problem. First, helicol and then a thread insert. Even the insert was a lot of since then it required a face for a washer gasket and there was problems and it wanted to leak till the face was flatten with a file square to insert.
Last edited by Jackie Paper; Sep 14, 2018 at 10:19 AM.