Author Topic: Help with crankcase bearing  (Read 542 times)

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Offline K7-Steppy

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Help with crankcase bearing
« on: July 30, 2019, 03:46:32 AM »
I've tried reinstalling the crankcase bearing but for some reason it does not want to go back in. I know it's the right bearing and everything but once I get it halfway in it just stops moving and if I try to spin the inside with my finger its having trouble turning from all the pressure. So I've ordered a new one in case I've damaged this one. If someone has some advice for getting it back in easily plz let me know. 

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Offline Progas

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Re: Help with crankcase bearing
« Reply #1 on: July 30, 2019, 05:03:50 AM »
Hi, that bearing doesn't fit flush with the case, it sticks out similar to what you have there. The easiest way to tell if it is seated, is to look at the back side off it and see if is hitting the case. Some heat in that area would allow it to slip right in, and make sure it's not cocked as you drive it in.

Online PeWe

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Re: Help with crankcase bearing
« Reply #2 on: July 30, 2019, 11:19:25 AM »
Heat case and drop bearing in from above when case is horizontal.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline pjlogue

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Re: Help with crankcase bearing
« Reply #3 on: July 30, 2019, 12:44:23 PM »
What folks said above and I would put bearing in freezer overnight.  Get area of case heated and quickly put cold bearing in.  Between the heat expanding the hole and the cold shrinking the bearing it should go right in and seat.

-P.

Offline K7-Steppy

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Re: Help with crankcase bearing
« Reply #4 on: July 30, 2019, 03:39:01 PM »
Sounds like a plan! will do and thank you

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