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149 cu in rod bearings
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Leon B MO View Drop Down
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Joined: 12 Sep 2009
Location: Old Monroe, Mo
Points: 2190 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Leon B MO Quote  Post ReplyReply Direct Link To This Post Topic: 149 cu in rod bearings
    Posted: 04 Sep 2012 at 8:05pm
I dont have a book on a 149 motor or for a D-14 yet but I will get one. I am making one good motor out of two and just getting started. I have both broke down and will need a set of rod bearings. From what I found the originals were 1.937, my crank is measuring about 1.905 right now. What oversize bearings are avialable for this motor?  Is there a .040  over available? The other crank has larger rod journals but then the main bearings would have to be oversized. I'll get the crank turned to fit the bearings.
Thanks
Leon B MO
Uncle always said "Fill the back of the shovel and the front will take care of itself".
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 21897 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2012 at 8:49pm
The way we do it around here is take the crankshaft to our local machine shop and tell them to clean and magnaflux it for cracks. If it is crack free, then polish it or grind it and get me new bearings, which are usually available in std...-.010"...-.020"...-.030" and -.040".
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Leon B MO View Drop Down
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Joined: 12 Sep 2009
Location: Old Monroe, Mo
Points: 2190 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Leon B MO Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2012 at 8:54pm
Thanks, I didn't know how hard those bearings where to find.
Leon B MO
Uncle always said "Fill the back of the shovel and the front will take care of itself".
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Lonn View Drop Down
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Joined: 16 Sep 2009
Location: Назарово,Russia
Points: 29817 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lonn Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2012 at 5:53am
.040" undersize weren't available from our local machine shop 10 years ago for that engine and would not be recommended as you are getting past the case hardening of the crank. I know someone who looked for bearing back then at .040" under.

Take it to a reputable machine shop and have them mic it or you can do this yourself if you are familiar with a mic and how to mic properly and maybe it only needs a polish. If my math is correct your crankshaft is ground to .030" under right now.
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JimD View Drop Down
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Joined: 11 Sep 2009
Location: Mounds, OK
Points: 2116 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JimD Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2012 at 10:08am
I agree, that is so close that I would have it professionally mic'd.  .040 bearings are impossible for me to source.  The machine shop might have them.
JimD
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