Yep. However when I measured the length of those pins on my trashed crancase I gave them a good hard hit with a hammer and punch. I caouldn't move them. Do they really go right through? It felt like they were in a blind hole to me.
The drawing for an 88 - 90 GS calls for 2 Anti Rattle pins 4mm x 26 mm. Don't recall the year/model of the OP's bike. I'm guessing that means that they go through the crankcase. May need a bit of heat wrenching to remove them? <TABLE cellSpacing=0 border=0><TBODY><TR><TD class=r10>11</TD><TD class=r11>ANTI RATTLE PIN</TD><TD class="r10 p1">4X26</TD><TD class=r11>2</TD><TD class=r10></TD><TD class=r11></TD><TD class=r10 noWrap>07119941433</TD><TD class=r11 noWrap align=right>$0.42</TD></TR></TBODY></TABLE> http://www.realoem.com/bmw/showparts.do?model=0478&mospid=51683&btnr=11_1688&hg=11&fg=10
OK. Here's what a crankcase with the pins looks like on the inside: From the side. You can see how far the pins stick out. <embed type="application/x-shockwave-flash" src="http://static.pbsrc.com/flash/input.swf" style="" id="IMGTag-code" bgcolor="transparent" quality="high" name="IMGTag-code" wmode="transparent" allowfullscreen="true" swliveconnect="true" allowscriptaccess="always" flashvars="ipt=%5BIMG%5Dhttp%3A%2F%2Fi5.photobucket.com%2Falbums%2Fy178%2Fpommiejohn%2Fcase2.jpg%5B%2FIMG%5D&trk=image_code_click_FULLVIEW_IMG&width=175&height=21&color=#000000&border=#BDBDBD&cont=IMGTagContainer" height="21" width="175"> The thrust washer runs on the crank, rubbing on the smooth face you can see on the crank. If the pins stick out too far they will push through the thrust washer and rub on that surface and do LOTS OF DAMAGE. <embed type="application/x-shockwave-flash" src="http://static.pbsrc.com/flash/input.swf" style="" id="IMGTag-code" bgcolor="transparent" quality="high" name="IMGTag-code" wmode="transparent" allowfullscreen="true" swliveconnect="true" allowscriptaccess="always" flashvars="ipt=%5BIMG%5Dhttp%3A%2F%2Fi5.photobucket.com%2Falbums%2Fy178%2Fpommiejohn%2Fcase2.jpg%5B%2FIMG%5D&trk=image_code_click_FULLVIEW_IMG&width=175&height=21&color=#000000&border=#BDBDBD&cont=IMGTagContainer" height="21" width="175"> <embed type="application/x-shockwave-flash" src="http://static.pbsrc.com/flash/input.swf" style="" id="IMGTag-code" bgcolor="transparent" quality="high" name="IMGTag-code" wmode="transparent" allowfullscreen="true" swliveconnect="true" allowscriptaccess="always" flashvars="ipt=%5BIMG%5Dhttp%3A%2F%2Fi5.photobucket.com%2Falbums%2Fy178%2Fpommiejohn%2Fcase2.jpg%5B%2FIMG%5D&trk=image_code_click_FULLVIEW_IMG&width=175&height=21&color=#000000&border=#BDBDBD&cont=IMGTagContainer" height="21" width="175"> <embed type="application/x-shockwave-flash" src="http://static.pbsrc.com/flash/input.swf" style="" id="IMGTag-code" bgcolor="transparent" quality="high" name="IMGTag-code" wmode="transparent" allowfullscreen="true" swliveconnect="true" allowscriptaccess="always" flashvars="ipt=%5BIMG%5Dhttp%3A%2F%2Fi5.photobucket.com%2Falbums%2Fy178%2Fpommiejohn%2Fcase2.jpg%5B%2FIMG%5D&trk=image_code_click_FULLVIEW_IMG&width=175&height=21&color=#000000&border=#BDBDBD&cont=IMGTagContainer" height="21" width="175">
Yeah, I think Anton called it first in post #39. Shows to go that the experience that you and Anton have allow you to see things earlier. But I unjderstand that CJ needed to ask questions to clarify this picture in his mind. So CJ, are you going to keep us updated on your progress? Are you going to pull the crank and install new pins?
Well PJ, you got me offa my butt for this one! Just to be sure, I went out to the garage and gave one of the pins in my trashed block a whack with a hammer and it went flush on the trans side and the the missing length appeared on the inside. Then I hit it again using a pin-punch and even more of it went through as I expected it would. Yeah, the pins are one piece and go through the block. In this photo note that the pin at 10-O-clock is still in place but the one in the 4 O-clock position is missing. Well, it's missing because it's been driven right through the block. See where someone has drilled out the holes that the pins go through? Thats part of the damage that Michael Pettis did to my block and this is only part of the story. Most of the damage in on the inside of the block. Be careful who works on your bikes guys. There are some real hammer mechanics out there and not all of them are in CA. PS: Fishkins has pointed us to an exploded drawing that shows these as parts #11 and they appear to be threaded on each end but I think that thats a mistake on the drawing. If you look at the MAX BMW parts drawing, it's part #13 and no threaded portion is illustrated but the parts cost eight cents more each. http://www.maxbmwmotorcycles.com/fiche/DiagramsMain.aspx?vid=51889&rnd=03192010 I hope this helps.
Your bump prompted a full thread read...to summarize: during a rear main seal r&r CJ disturbed the external rear thrust washer from its locating pins, installed / torqued the flywheel & in the process said thrust washer pressed dowels into the crankcase, as understand it. I would guess at this point he is sourcing a new block or mothballed the bike? As usual, a lot of good information/advice given.
Yes, it was a pretty good thread. esp. The photos supplied by inmates - I learned from them. I'm hoping that he's had some luck getting it back on the road.
Goodstuff CJ. As an amateur noob BMW tinkerer I have learnt a lot from this thread. The pics from Pommie John especially made it a lot simpler to understand. Thanks for that. Keep going & let us know who it goes. If you could take lots of pics for the rebuild it would be appreciated.
sorry for the late reply guys. im currently in the process of moving to a new place so i havent even touched the bike since my last post. i've been reluctant to take it apart due to the fact that im unsure how much time i have before ill have to move everything over. i definitely dont want to get myself into a rush and be forced to put it all back together without adequate time. so ultimately ill have to make a pretty big decision real soon here. i guess i have 2 options: 1. stick with the bike and work through it. it'd be a great learning experience as i have never done actual motor work as you can probably tell. or 2. possibly sell it. i kinda wanted a bigger motor anyways so maybe i can just get a new short block or just sell it completely. i dunno...i havent given it too much thought yet but ill let you guys know what i end up doing.
It's a tough bind, no doubt about it. Only you can decide. Are there any airheads locally that could help out? I hear they like beer.
Hmmm, sell it? That might be a tough sell. It's a collection of parts that needs to be disassembled, repaired and then reassembled. Ifn you're inclined to learn more then why not keep digging in. What've you got to lose? Really, all you need to do is pull the crank, replace the pins and reassemble it. It's not as simple as that but it's also not much more complicated than that.
Working on a friend's newly aquired 74 R90/6 and ran into this exact problem doing the main seal for him. First time working on a BMW and after doing a search on this found this dated thread and found this to be the problem. SO anyhow took the advice intended for the original poster and tore down the motor to find a smashed thrust bearing and two malformed locator pins ordered all the replacement stuff and have been reassembling today. the damaged pins were punched out and were a very tight fit the replacement pins now fit a little loose, I was able to slide them easily by hand and they will move in and out with any pressure. I considered putting a little bit of epoxy on the pins to set them? Or can these float I assume the rear face of the flywheel would keep them in place in the rear but the rear crank counterweight seems to allow the pin to float forward at certain positions. Considering how easy it is to end up with this disastrous situation I hope to be able to come out of it with an answer for others who run into this problem.
I set the pins with a little JB weld carefull placed with a tooth pick around the base of the pins and and also in the rear thrust bearing holes...crank spins freely with new seal and flywheel attached. I guess i'll get back to everyone after a few hundred miles and hopefully everything will be alright.