Changing e21 Guibo...

[mybmwhabit]

Did some searching, here and elsewhere, didn't find anything terribly comprehensive on changing the GUIBO. Has anyone done this and posted pics with a link, that I just seem to be looking at and not seeing? thanks!

[320iAman]

Whats wrong with the one that is installed ? Second there is two types of Guibos for these cars 6 Bolt one and 8 Bolt one, 6 bolts ones are specific on how the bolts are installed. Which one do you have 6 Bolt or 8 Bolt ? Get a Haines Book and read up on the car, its not perfect yet the details in it are enough to due it correctly.


Randy

[eqrock]

Its been a while since I've done this and I don't have any pictures. But I think you undo the 6 bolts if manual or 8 if auto on the guibo, and undo the 2 on the driveshaft center support bearing. Then lower the center support bearing enough for the front of the driveshaft to clear the rear of the transmission, replace you guibo and put it all back together. I think you're supposed to use new nuts and bolts on the guibo, not sure of the torque spec, and you also need to pre-load the center support bearing when reinstalling it, by pushing it toward the back of the car as you tighten the nuts. Again not sure on the specs for any of this, you should definitely consult a Haynes or Chiltons manual. You may have already seen this post, but it was very helpful for me so I'll try to link it.https://www.bimmerforums.com/forum/s...bo+orientationHope this helps, Ethan

[320iAman]

I have 8 Bolts and its a manual 5 speed transmission,, Getrag 245 5 sp with OD and spare Complete Getrag 245 5 sp with OD with 4 bolt output flange. 6 or 8 bolts depends on the drive shaft having 3 or 4 bolt holes and the transmission output flange having 3 or 4 bolt holes its not specific to manual or automatic transmission. Several Getrag 240's 5 sp with OD, I have seen - 1983 Model 320i E21 have 3 bolt output flange and 3 bolt drive shaft. The automatics I have seen have been 6 bolt Guibos.

Randy

[amarino]

06/1981 320i Manual - 6 bolts
IMG_20150407_174049.jpg


Here:https://www.bmwtechinfo.com/repair/main/027en/index.htm
Click in the middle of the page > 26 Propeller shaft > 26 11 000 Prop shaft assembly - remove and install (and the 051 Rubber coupling for front prop shaft section)
260.jpg261.jpg


Also. I KNOW THIS IS FOR E36, but the general procedure and better pictures should be the same:
http://www.pelicanparts.com/BMW/tech.../E36-Guibo.htm

I think the guibo is directional and has arrows that need to point to the front of the car.

[320iAman]

My Spare Getrag 245 5 Sp with all new seals, new silent blocks-support brackets, new gear shift rod joint and complete( less the stop buffer and upper and lower bows--I think I'll get these as well, although I have a new stop buffer), same as one installed on my car - originally. Yes amarino the speedo has new seals. I have cleaned it up some, its filled with oil and I turn the 4 bolt output flange around in all gears every now and then--maintenance. This one has a way of its own to be blueprinted by people I know, thru a rebuilder I know.

4 bolts are stronger than 3 bolt flanges and better percentage wise in delivering torque to the 3rd member which has a 4 bolt input flange, Do you see why ?. BMW must have assembled-made some cars with 3 and some with 4, 3's output flange are standard automatic output flanges and Getrag 240's and some Getrag 245's. Flanges go output-input-output-input.

DSCI0149.JPGDSCI0150.JPG3400.jpg

Which one 6 or 8 ?

Randy

[Tom D]

......4 bolts are stronger than 3 bolt flanges and better percentage wise

i dont believe this to be true and thats why BMW changed the guibo to 6 bolts around 1980. from an engineering standpoint i believe the guibo is stronger and less likely to stress crack with less holes and more rubber.

[mybmwhabit]

Thanks! Next project on the list...

[320iAman]

Think 4 Bolts vs 3 bolts in transmission of torque and 4 bolts receiving torque vs 3 bolts,, Mine is a 01/1980, change was later . I see your point and its a good one,yet 3 arms will flex more than 4 arms, thus be more prone to crack,4 arms send and receive the torque more equally with less strain yet with 100 HP I dont see that as an issue simply a % difference in more torque. More rubber and less Bolt density is more flex or twisting moment -less torque transmitted,,the twisting in High HP will snap the bolts or bolt and or snap , crackle, pop one or more of the lesser number of arms,,1 most likely, now factor in the bolt flex of 10.9 difference to 12.9 or higher 14.9--a percentage loss in torque going from smallest at idle to largest at Wide Open Throttle, Thanks for your input-the greater density of these 3 items the less loss of % torque-you knew this all along,.

Or the Blue Collar Engineers HD Heavy Duty was countered by White Collar Stock for Cost Savings which I have seen in more than one German Company,Bosch Especially.

Randy