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M6 crankshaft end float
Posted: Sat Apr 01, 2023 7:14 am
by Tim K
Hi Everyone
What should the crankshaft end float be on a 1929 M6 (plain bearings). When I disassembled the engine all the shims were on the drive side, is this correct or should I split the shims across both sides?
Cheers
Tim
Re: M6 crankshaft end float
Posted: Sat Apr 01, 2023 4:19 pm
by Duncan
Hi Tim, unfortunately I don't know what the end float should be for your engine but early 50's singles were between 0.020" and 0.050" (service limit)
http://archives.jampot.dk/book/Workshop ... ndards.pdf see page 7. From other makes of pre-war engines I have worked on the required shimming should be positioned between sides to ensure that the conrod is running central to the bore/piston.
Re: M6 crankshaft end float
Posted: Sat Apr 01, 2023 11:42 pm
by Tim K
Hi Duncan
Thanks for that. Splitting the shims between the sides makes sense as having it all on the drive side could misalign the big end oil feed through the drive side bush.
Cheers
Tim
Re: M6 crankshaft end float
Posted: Sun Apr 02, 2023 7:41 am
by Taid
Rather than simply splitting the shims equally, should they not be divided such that the big end journal is central ..
I know it sounds like the the same thing ... But if shims are needed, you can't assume the same amount is needed each side ..
Re: M6 crankshaft end float
Posted: Sun Apr 02, 2023 11:37 am
by Duncan
Taid wrote: ↑Sun Apr 02, 2023 7:41 am
Rather than simply splitting the shims equally, should they not be divided such that the big end journal is central ..
I know it sounds like the the same thing ... But if shims are needed, you can't assume the same amount is needed each side ..
Correct, but stated clearer than I managed to.