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How to remove Evo inner cam bearing


Old 10-19-2009, 11:40 PM
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Default How to remove Evo inner cam bearing

Thought I'd post a few pics showing the removal of an inner cam bearing for a 98 Big Twin Evo.

1. The subject of my attention: An existing Torrington bearing (as seen through a lifter block hole) that I want to replace because I'm installing a new VThunder 3020 cam (failed lifter took out my previous 3020).

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2. FYI: Here's how to tell a Torrington bearing from an INA (more precisely, how to tell a "full compliment" bearing--the Torrington in this picture--from a "caged" bearing, like the INA one shown.) Not sure who I pilfered this pic from, but I think I got it from elsewhere on this board. Note: There are some bearings being sold as Torringtons that bear the letters "TORR" stamped on them. I contacted Timken and the Process Line Manager in charge said current standards call for their bearings to be stamped "Torrington". He's not sure if these "TORR" bearings are fakes or perhaps some old product that pre-dates the current marking standards.

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3. "OEM Blind Hole Puller Set" rented borrowed from AutoZone ($175 fully refunded deposit)

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4. Slip this into the bearing with the lip behind it, and tighten the bolt to expand the puller lips behind the bearing.

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5. Attach the slide hammer and give it a few good jolts, and the bearing pops out nicely.

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6. I used the same tool to remove the gear cover bushing. Note: Do not remove this bushing unless it's necessary. Per the service manual, replacing this bushing requires that you: 1. press it in, 2. drill a very precise hole through it and into the gearcase cover, 3. pin the bushing in place, 4. drill and chamfer a hole through it for an oil passageway, and 5. align ream it to properly fit your camshaft and to align it with the inner cam bearing. I yanked mine before I realized all this, and took the cover to a local indy who charged me $60 to press-in the bushing and oil seal, and ream, drill and chamfer the bushing. The bushing fit tightly enough that he felt it wasn't necessary to pin it.

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7. ...and the bearing oil seal.

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Last edited by Z; 10-24-2009 at 12:43 AM.
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Old 10-20-2009, 01:48 AM
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Damn nice.
Planning on attempting this myself in the next few months those pictures are a helluva lot better than the manual.
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Old 10-21-2009, 05:10 PM
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JT, glad you found it useful. I get so much value from this forum and others like it (for all my vehicles) that I always try to give back when I do a major repair by writing it up with pictures, because I know how much I appreciate pics from others. Just payin' it back and payin' it forward.
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Old 10-23-2009, 08:26 PM
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great post . Just did cam etc myself and was looking for the correct tool instaed of a regular puller . I had to actually show the guys at autozone what tool I as looking for but they had it . Thanx!
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