Lower head bearing cup change
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wyofisher
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Lower head bearing cup change
Anyone removed a lower head bearing cup? Mine is damaged, and I'm having a very bad time getting it out. I would explain my current opinion of Japanese engineering right now, but these forums are supposed to be kept clean.... I could really use some help here.
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Lucasind
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Re: Lower head bearing cup change
...Have you already tried heat ?.......
90% OF ANY JOB ...IS GETTING STARTED !
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Gator Mike
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Re: Lower head bearing cup change
It's been several years since I've changed mine but if memory serves I came in from the top and used a long punch to drive it out. Might try soaking it with WD to loosen up any deposits........Gator Mike
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1994 Voyager XII
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ekap1200
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Re: Lower head bearing cup change
gator mike has got the right approach, don't get it cocked in the bore. work it from side to side then 90degrees and side to side again. If it gets cocked work from the bottom and drive it back into the bore, and start again. If you have any friends that are professional mechanics they may have the right puller for internal cups. If your just working on a wooden floor of a shed you may want to cut a 2x4 to fit from the floor up to the head so you get more force to each blow of the hammer. Keep your punch dressed flat with a bench grinder ,the cups hardened and will kill the flat in just a few blows. Use something larger than a nailing hammer, its supposed to be a tight fit. ekap1200
"Its not bad if you don't know something, but when you don't know you don't know; That's when your in trouble". Joe Place 1912-2008 (my grandfather)
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wyofisher
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Re: Lower head bearing cup change
From the top there was no way to get any kind of tool to touch the lower cup. It looks like a smooth bore from there. Even my slide hammer couldn't get a grip. Grinding out the bearing to crack the cup wasn't working either. I was bouncing around the internet and someone had used a 2" washer ground to an oblong to fit above the cup and lay across it (obviously on a different bike). I had 1/8" flat steel, so I made the general shape, and it didn't fit. But, laying that oblong flat steel cocked in the tube resting on the cup, I was able to use a drift and alternate sides with that flat steel and finally got it. I still say, what a stupid bit of engineering, making no access to the bearing cups. Now I have to go to my tool box at work and retrieve my bearing driver set, I admit, I'm not coordinated enough to drive in a bearing without that tool.
Lesson to me: grease that bearing more often so I don't have to replace it.
Lesson to me: grease that bearing more often so I don't have to replace it.