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early/late crankcase question

Moderators: Curt!, Pa

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mark59

Posts: 55

Joined: Wed Nov 18, 2009 7:40 pm

Post Fri Jan 10, 2014 9:16 pm

early/late crankcase question

even'n folks. working on another ULH bobber, i was wondering if early and late cases can be mated up? not concerned with blind bushings, baffles, but is there any major reason say a 37 and a 46 would not be workable together as a pair. have an early set with an old repair on one half and i have a good later case half i would rather use
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RUBONE

Posts: 380

Joined: Fri Nov 30, 2007 7:24 pm

Post Fri Jan 10, 2014 11:28 pm

Re: early/late crankcase question

They mate just fine. The later cases don't have baffles along with the through races. Otherwise pretty much the same and will bolt right up.
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mark59

Posts: 55

Joined: Wed Nov 18, 2009 7:40 pm

Post Sat Jan 11, 2014 2:31 pm

Re: early/late crankcase question

colony machine co offers two different case bolt kits, basically early and late U's. was wondering what was different with these kits? thanks robbie, your info is always trusted as sage advice. mark
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Jerry Wieland

Posts: 606

Joined: Mon Nov 01, 1999 1:01 am

Location: Menomonie, Wisconsin, USA

Post Sat Jan 11, 2014 6:47 pm

Re: early/late crankcase question

Early motors did not use aligning studs and later motors 1941 and up did. Jerry
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Frankenstein

User avatar

Posts: 1550

Joined: Thu Jun 27, 2002 12:01 am

Location: Interlaken, NY USA

Post Sun Jan 12, 2014 9:08 am

Re: early/late crankcase question

Here's a set of
"37" cases on ebay, mismatched, but what caught my eye is the catch basin in place around the rear exhaust cam gear. Didn't think that 37's had this feature, but the belly numbers look o.k. Any thoughts?
also looks like someone reamed the right side case to remove the flange.

http://www.ebay.com/itm/201017593575?ss ... 1423.l2649

DD
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don

Posts: 552

Joined: Fri Oct 01, 1999 12:01 am

Location: Spokane WA USA

Post Sun Jan 12, 2014 10:16 am

Re: early/late crankcase question

My 37 matched set, with VIn in 7000 range does not have the raised casting taller than an installed scavenger drive gear.
But, The production numbers are in the 6700 range.
The #'s on the Ebay example are 7500.

Another difference is '37,'38,'39 Did not have a relief for Screen between Scavenger tower and case.
don

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