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R51/3 crankshaft endplay?
R51/3 crankshaft endplay?
I am rebuilding a friend's R51/3 that destroyed its connecting rods. I am trying to find the crankshaft axial permissible play inside the crankcase but the workshop manual does not state it. Do any of you kind fellows happen to know it?
Thanks in advance
Alkis
- Micha
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Re: R51/3 crankshaft endplay?
http://salispartsusa.com/parts/wp-conte ... -tools.pdf
There's also the stuff regarding con-rods etc.
R51/3 1952
Engine Nr. 529466
Re: R51/3 crankshaft endplay?
It is strange that BMW does not state the correct endplay of the crankshaft since they are very thorough with the gearbox shafts endplay. They do not even have shims with different thicknesses for the crankshaft..
Any way thank you very much for taking the time to answer me.
- schrader7032
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Re: R51/3 crankshaft endplay?
Not your bike, but I suspect that something in this ball park is what you're looking for.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- bm68andreas
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Re: R51/3 crankshaft endplay?
I have a tip for you where you can send your crank for rebuild,.....
He knows all the details about BMW's cranks...
saluti Andreas
Re: R51/3 crankshaft endplay?
Andreas, I live in Patras and i have sent the crankshaft to Panagakis machine shop. It is a local machine shop that i have worked with in various occasions and have always been satisfied. Who are you proposing ?
- bm68andreas
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Re: R51/3 crankshaft endplay?
he has more experience..
call me ..6942805221.
have a nice day
- caker
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Re: R51/3 crankshaft endplay?
Like a "6004" has no noticeable axial movement between the inner and outer race, whereas a "6004-C3" you can feel it with your fingers.
C0 up front, C3 in back, as I was recently mentored.
-Chris
- malmac
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Re: R51/3 crankshaft endplay?
Chriscaker wrote: ↑Thu Jun 17, 2021 9:15 pmAll things being equally mounted, I'd think it would only depend on the clearance spec of the main bearings used - the axial play in the main bearings - at most.
Like a "6004" has no noticeable axial movement between the inner and outer race, whereas a "6004-C3" you can feel it with your fingers.
C0 up front, C3 in back, as I was recently mentored.
-Chris
I think you are on the right track. Not sure if this helps.
When doing a crank positioning which has plain bearings, there has to be shims to position the crank forward and aft and to set a suitable amount of end float.
However when the crank is using roller bearings then the end float is, as Chris states, determined by the clearance specs for the specific bearing used.
The positioning of the roller cranks is still important and shims are used to correctly position the crank in the crankcase in respect to oil slingers and centering the conrods in the barrels.
Hopefully this will assist or perhaps just seem to make even more questions.
Mal
Toowoomba- Australia