Airhead Engine - Bottom End Assembly - Custom BMW R90/6

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The time has come on this BMW airhead project to start putting parts back on instead of taking them off!

We're starting with the lower end of the engine. The main bush bearings - front and rear - get replaced with fresh ones. A special modification is made to the front main bearing carrier to ensure the bearing stays in place. Then the crankshaft gets installed next and the endplay is measured to ensure everything is where it needs to be.

Finally, the camshaft is installed followed by the timing chain. A slight mis-step with parts ordering stalls us momentarily - there are two kinds of oil pump inner rotor and we have the wrong one! The correct piece is ordered - wait for part two of the engine assembly to see that!

Want to see more of the Custom BMW R90/6 Project? Check out the playlist here:

Parts made right here in Rochester, NY are available here:
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I’m restoring a R90S and your video is great as i’m exactly at that stage.
Thanks and well done

massimofigna
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This has been very helpful... Thank you very much

wheeldz
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Great Video! I learned a lot of useful stuff that will come in handy in my near-future rebuild. Thanks!

nathansunshine
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did you need to replace the thrust washers? or reuse exciting?? please and thank you

cozydram
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Hey so I'm looking to get my engine parts vapor blasted and then powdercoated. Should I remove the rear main bearing insert prior? Also, any idea what temperature I should measure the main bearings at? I'm not seeing this stated in my Clymer manual at all...

TemUp
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Love this video! Curious do you always need to replace the Main Bearings, Front and Rear when disassembling the motor? I have my motor all the way bare, down to just the casing and rear main bearing. The Front main bearing remains inside the carrier. I'm going to clean the casing and vapor hone it. But will seal it prior to and clean after the vapor honing process. Should I replace my rear main bearing, minimum? or do I need to replace both?

jasonwhite
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Hi

If the endplay is too large, where do you put the shims?

rogerstenbro