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Post by tripletriplenut on Dec 22, 2010 8:19:51 GMT -5
they said something was clamping the bearing to tightly in one area deforming the bearing outer race. i didn't divulge any info. but i think the loctite was the culprit. so no free replacement bearings
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Post by tripletriplenut on Dec 22, 2010 8:35:49 GMT -5
yes had skf diagnose the bearings to make sure we didn't have an oil problem which would have lead to another failure. well when you get it back together check it for vibration and if it does vibrate bad you will have to figure out why. hopefully it was the tight bearings causing this vibe.
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Deleted
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Post by Deleted on Dec 22, 2010 10:55:17 GMT -5
nice diagnosis Don. from another angle, I think I read back a bit that the case sealant was "scraped" thin with a credit card too, before mated together. Could not enuff sealant, plus "excessive" LOCTITE add up to double trouble in the clearance dept?
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Post by tripletriplenut on Dec 22, 2010 17:02:07 GMT -5
it could not make things better. so no loctite and don't scrap the sealant to thin it out, and things should be just fine.
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paul
2nd Gear
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Post by paul on Dec 22, 2010 19:23:33 GMT -5
when i had a look at rocket's (mike) cases the loctite was put in blobs in the bearing saddles and the bearings were then set into the pools of locktite. furthurmore the loctite used was high strength 262 loctite threadlocker (meant for threads) and not a bearing retaining compound. i recall peeling off a piece of the hardend loctite and measung it with a micrometer and it was about .002" to .003".
however i am for the idea of using a thin film of loctite 609 which is a medium retaining compound around the circumferance of my beaing races and will be putting some on my bearings when i get my crank.
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Post by tripletriplenut on Dec 22, 2010 19:55:31 GMT -5
if you put the cases together and torque to spec and measure the bearing bores and then the bearing outer diameter you will find that there is enough tension to hold the bearing race even if the bearing fails and seizes it will spin on the crank before it spins in the cases. there is no need for loctite. if you need loctite to hold the bearing in the cases then you need new cases.
if the loctite was .002 to .003" that would explain what skf results and most likely the excessive vibration that Mike was talking about.
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Deleted
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Post by Deleted on Dec 23, 2010 10:52:45 GMT -5
But.................
There are times you have to LOCTITE, or glue. ie, on my B with the crank resting in the upper case 1/2 only, I can spin two of my inside bearing, outer races, as they are not contacting at all. Factor in my outer race on one had spun, 16,ooo K ago. IMO to just torque it together and force the crank down into it's support would be, dumb. Or if it is actually loose once cases are mated, then it would "vibrate and schrapnel. "That adds stress right off the bat which will lead to bearing failure too. Not loctiting, I doubt my B crank would still be in service today if I hadn't. It would have been "Soo Bound" 4 years ago for a TTN-O/H. But instead it's logged me over 16,ooo trouble free K's, and still rattling away. A very tired but always a 100%, perfectly running reliable motorbike. And I have pounded the living snot out of it.
Now for the big BUT: But I globbed then spread mine thin to start. All excess wiped away. It was easy to see the potential of it to run where I didn't want it to. I am actually more concerned about bearing, piston or cylinder damage from a chunk of Loctite coming loose after a spell and making it's way thru the engine. In case you have never seen this stuff hard. it's rock hard, looks like glass but stronger. A shard of it could easily take out a bearing, rip a seal or damage rings and cylinders
Rockets issue, yip i think the bearing got f'd an ass'y now that Don has CSI'd things. You'll get her going Rocket. Don's diagnosis really opened my eyes to the correct use of LOCTITE. I had a GURU show me my first O/H, what to watch for. It was him that showed me how the crank was out on my KH too, and how important it is to make sure the crank "sits" where it's suppose to. You can't force something to go where it should or trouble will follow. This kind of issue needs attention before the cases go together.
My beloved B, "It's not just good, it's good enuff"
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paul
2nd Gear
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Post by paul on Dec 23, 2010 13:03:04 GMT -5
i think if you crank is sitting in the case half and your bearings spin that is likely a run-out issue and if that is so, locktite isn't the answer.
in my own particular case i wonder if bearing spinning issues (cases assembled) are due to the heating and expansion of the crankcases combined with a engine under higher load. my engine had signs of main bearing and trans bearings spinning. the cases remained un-scored leading me to believe that it's an intermittent thing under a certain scenarios. i measured my main bearing bores and checked for case warp and found everything to be ok.
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Post by tripletriplenut on Dec 23, 2010 14:23:57 GMT -5
+ one to pauls first line.
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Post by tripletriplenut on Dec 23, 2010 14:27:55 GMT -5
will have to see if the crank bearings have a locating pin version
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Post by Deleted on Feb 24, 2011 9:03:16 GMT -5
the goo even if it did melt would melt slow enuff to burn up anyway, such a residual amount at a time, if any went thru. Check your mains when that new crank gets dropped in. One at a time try and spin them. See if any have less drag than the others. I am sure the crank will be dead nuts. Cases do distort. Does anyone ever re-torque the bottom ends ? I can't see it hurting anything cool pics, they look old, really, really old
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Post by givr on Feb 24, 2011 9:12:55 GMT -5
Cool old pics. You're a bit more safety conscious now eh? I take it you still have the crashbars and backrest. Rear footpeg looks a little bent though. ;D
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Post by Walms on Feb 24, 2011 9:31:17 GMT -5
Skinny runt! ;D
BTW, is that a showi helmet? I believe I had the same one in red!
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Post by North on Feb 24, 2011 13:58:21 GMT -5
Yeah Mike.... you're such a fatass now!! ;D Nice pics though
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Post by wheeliehappy on Feb 24, 2011 18:09:18 GMT -5
i cant believe the pants back in the day and are those North Star Runners you have on.
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