3M 1.40

[mdarr00 at comcast.net]

    I disassembled my 3M 170, and found metal shavings in the grease for the
rear bearing.  There were other small metal shavings in various places in
the engine.  I completely cleaned every part and reassembled it.

    The connecting rod does not use bearings, it uses bushings just like all
other connecting rods.  I have not ran my engine as of yet, but it is
definitely a beautiful work of art, the tolerances in the engine are nice
and tight, a very good sign of high quality.  The rear bearing on the 170
has the same i.d. and o.d. of the 140, except that it has a double row of
rollers.  Boca Bearing measured the bearing on my 170 at the Toledo show,
and they told me they should have the bearings available in a couple of
weeks.

Mike Darr


----- Original Message -----
From: "Woodward James R Civ 412 TW/DRP (Test Ops)"
<James.Woodward2 at edwards.af.mil>
To: <discussion at nsrca.org>
Sent: Thursday, April 10, 2003 3:11 PM
Subject: RE: 3M 1.40


> Before running my 170, I did take off the head and backplate and look
> inside.  They use ball-bearings on the connecting rod If I remember
> correctly.  Then, I put it back together and checked all the other bolts
for
> tightness and ran it.
> Jim
>
> -----Original Message-----
> From: AAbdu at aol.com [mailto:AAbdu at aol.com]
> Sent: Thursday, April 10, 2003 12:08 PM
> To: discussion at nsrca.org
> Subject: Re: 3M 1.40
>
> I wouldn't necessarily suggest taking it apart, unless you just like doing
> that sort of thing. Just give it a very thourough visual inspection and
keep
> an eye out for anything that seems to be a little "weird". At the very
most
> I might take off the head or the back plate (probably not with the pump
back
> there)and give it a look. Mike Darr is the owner of the engine I looked at
> and he is on the list so he would probably be able to tell you much better
> that I could what to look for. Overall I was very impressed with it. It is
> possible but unlikely that 3M would go through the trouble of
manufacturing
> such an obviously high quality premium engine, then shoot themselves in
the
> foot by not paying attention to an important detail like clearing all
milled
> material before final assembly.
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