Topica Loopframe_Guzzi Archive


Subject: Re: To Teardown or Not Teardown?

Author: Bruce Giller

Date: Oct 9, 2002, 8:05 AM

Post ID: 1711174757


Ah, now I recall that technical term, 'big end float'. Way too many
things to remember... But I've got another Alfa engine to rebuild that
I might do soon.

But it was fun and a great feeling to find out that the engine actually
worked...and I was the one who did it.

Bruce

PS - I guess I should have wrote, 'to enhance oil flow'....

PSS - and I was actually thinking of 'hand scraping' the bearings until
a machinist told me that it was a highly skilled job and the modern
plain bearings are very precisely manufactured. So I dropped the idea.

Martin Cooke wrote:
 
oh i see now. you are of course talking about getting the right end float. i
didn't understand

you can actually do what i was suggesting to get a con rod back in spec if
eye bore is too large, well not with a file really, then rebore hole to
correct dimensions.

cookie

ps. in the interests of remaining a smartarse, i would point out that the
gap lets oil out, not in though :-)

----- Original Message -----
From: "Bruce Giller" <bgil-@mitre.org>
To: <Loopfram-@topica.com>
Sent: Wednesday, October 09, 2002 3:44 PM
Subject: Re: To Teardown or Not Teardown?

 Martin,
I wasn't reducing the diameter of the 'hole' in the big end but the
width of the big end; the spec called for measuring the gap between a
side of the big end to the journal shoulder on the crank with the rod
bolted to the crank (the wider the gap, then more oil can get in there).
To file, I bolted the end cap to the big end, and filed across the flat
sides of the big end. I sure wish that I had done the measureing BEFORE
I sent them off to the machine shop; then they could have done it.

Bruce

Entire thread: