M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine + Driveline => Topic started by: dsm2002 on April 27, 2013, 10:49:56 PM
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Has anyone measured the nose of the M42/M44 crank with a micrometer i.e. for machining a M47 crank?
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Member "Warsteiner" posted about this subject just today.
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Just measured mine and got 1.239in or 31.47mm. Mind you, this was with a Harbor Freigt micrometer and a very inexperienced hand so your mileage may very.
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Thanks to both! I did not pick up on the crank spacer and bolt during my readings. I had around 31.5mm or so, maybe 31.7 with my el cheapo plastic calipers, my good ones having taken and walk.
I was considering an harmonic damper which has an ID of 1.2495" or 31.74mm which may not fit. Dampers need an interference fit and this could be too loose.
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I gave some measurements but NOT for the nose of the M47 crank. I gave mine to my machinist and had him match it everything up so I don't have the numbers on that for you. I can give you almost everything else for numbers on the stroker :)
What I posted was actually the thickness the spacer has to be and the stock one. Also the length of the threads after the bolt is cut.
Cheers,
~Ralph
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Thanks Ralph. That's how I understand it. I note my response is not clear. I had attempted to respond to two issues, firstly mabeer providing a measurement of the crank nose. The second is colin86325 directing me to your post, which while it did not have the crank measurements I was after, did mention the spacer and bolt issue that I had not picked up on.
I'll make a new thread about harmonic balancer discussion soon.