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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 3 Weeks Ago
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Default Cam needle bearings correct install

Was reading an old Dr Dick post. Cam needle bearings are supposed to be installed with the writing facing the cams, he said.

My case has 2 Koyo USA needle bearings, the 1st and 4th. The two middle ones, #2 and #3, are either unbranded or turned around so the writing faces the flywheel.

Is this a problem? I'm about to get a puller and change the middle two them for my peace of mind, but wanted to check with y'all.

Edit: I forgot to mention my indie put them in. They are brand new.
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RicThompson RicThompson is offline
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If you're already in there replace all 4 of the cam needle bearings.
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I forgot to mention my indie put them in. They are brand new.
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Don't try to remove the bearings with a jaw type puller.
To remove the bearings without dropping needle bearings a collet type puller.

I am also told do not try to push the bearings out from the outside.
Push the bearings from the inside towards the cams when removing (while the cases are empty)
I use a socket and the press to install them from the cam side.

I don't think the bearings deform if installed backwards, they are not fit that tight in the Harley case.
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The issue is that when pressing bearings you're supposed to press on the side that's printed. On the year cases you're working on there is a small shoulder on the flywheel side of the cam bore so they have to be installed from the cam case side and removed towards the cam cover. So if installed correctly the printing will be towards the cams.

If someone installed bearings with the printed side in by mistake and it's a new bearing I wouldn't be concerned about it.
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Default Cam Bearings

The bearings are supposed to be installed with the writing out because the bearing case is thicker on that end, they also need to be pressed in. If hammered in even with the correct tool they still can be damaged. Yours might be alright but there is always the chance they are not. Personally it would bother me and I would change them but it's your call
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leave them be.
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Need speed is correct, there is a lip on the inside to prevent the bearing from going into the flywheel chamber. The bearings have a gental radius on the side opposite the lettering to make installation easier. If they are in place and turn freely leave them, they will be fine! Maybe suggest to the installer to pay better attention to details?
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Quote:
Originally Posted by Nitro57xl View Post
Need speed is correct, there is a lip on the inside to prevent the bearing from going into the flywheel chamber. The bearings have a gental radius on the side opposite the lettering to make installation easier. If they are in place and turn freely leave them, they will be fine! Maybe suggest to the installer to pay better attention to details?
UMMMMM I had him put the bearings in in two cases, my 72 and my 73. For the 72, one bearing is in lettering-in, on the 73, two are.

"I've been working on ironheads for 40 years!"

For $2900 worth of work, the little niggling details like this tick me off a little. And 2 of my trans gears are AWOL as is the extra trans door I dropped off to him and decided not to use.

I like the guy and think I get along with him, it's just do the damn job meticulously right, ya know?
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" I've been butchering Ironheads for 40 years!"

Find a mechanic. He may not be concerned about doing it right.
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