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Reaming bearings

Old Marine Engine » One and Two Cylinder Gas Inboards » Reaming bearings « Previous Next »

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jb_castagnos
Senior Member
Username: jb_castagnos

Post Number: 463
Registered: 07-2002


Posted on Sunday, August 09, 2009 - 03:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Over a yeare ago I welded this crank for a friend. The flywheel was loose so we had the crank ground .020" over, Dickie Gibbens bored the flywheel for a snug fit. Instead of setting the case up in the lathe and boring it, I decided to make a ream. Took an old piece of shaft and turned the pilot to fit the bearings, left it .020" over at the step. I milled some slots at the step and sharpened the leading edges, it cut through and did a nice hob, just wish I had cut the slots deeper, they had to be cleaned out often. ream
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richarddurgee
Senior Member
Username: richarddurgee

Post Number: 2147
Registered: 11-2001
Posted on Monday, August 10, 2009 - 05:58 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

*
J.B.
Excellent looking work ! Wondering how you support the reamer for alignment ?

Seeing the reamer reminded me of looking at some old engine machine tools at an eng show awhile ago. Wooden case with "Stevens" name on it had a reamer bar and iron frame to bolt on eng block to line ream main brngs on Model T fords, also had tooling to pour bearings, seemed to me a step up from hand scraping to fit !

Appreciate the photo post!

**
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jb_castagnos
Senior Member
Username: jb_castagnos

Post Number: 464
Registered: 07-2002


Posted on Monday, August 10, 2009 - 06:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Richard, the reamer pilot was long enough to fit through all three bearings. The bearings were in good shape so they supported the reamer. The cutting section of the reamer is 1 3/8 + .020", same as the crankshaft, it was self supporting. I built it with a one time use in mind, but it looks like I'll need it on an engine I just took apart.
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rbprice
Senior Member
Username: rbprice

Post Number: 253
Registered: 11-2001


Posted on Monday, August 10, 2009 - 10:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Nice work JB - what engine is it that has three nice bearings on a two cylinder engine?

Cheers

Bob
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jb_castagnos
Senior Member
Username: jb_castagnos

Post Number: 465
Registered: 07-2002


Posted on Monday, August 10, 2009 - 01:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

You're telling on yourself Bob, you're a 4 cycle man. The 2 cycle engines need a main between the crankcases to separate them. This is for Ernest Felterman's 8hp L-A. Due to health reasons Ernest hasn't been able to work on the motor, he and his son came over last week and we got a good start, hope to finish soon.
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rbprice
Senior Member
Username: rbprice

Post Number: 254
Registered: 11-2001


Posted on Monday, August 10, 2009 - 04:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

YEAH, yeah - but you are correct, I do tend to think of four cycle first off.

Thanks for the correction JB.

Stay cool and we will drink a few for you while at Mystic this weekend.

Bob

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