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Subject:Fwd: Boston Bob on Connecting Rod Bolts
From:Tom Lambas
Date:Tue, 7 Sep 2010 19:49:11 -0500

I'm gonna go with Van Cafe I think.

__________

On Tue, Sep 7, 2010 at 6:46 PM, Evan Mac Donald <evanm@att.net> wrote:

>
>
> I did not send my rods to Bob before he passed. Since the business has
> passed
> into other hands, the rebuuilding of rods as a service is not listed
> anymore. Now, I need to find a different source for this job. Has anyone
> heard
> anything, good or bad about this outfit:
>
> http://www.thesamba.com/vw/classifieds/detail.php?id=931786
>
> I hope to get my rods out this time, before something bad happens again...
>
> ________________________________
>
> <<Snip>>
>
> >Evan
> >1.9 and 2.1 rods are the same casting and are interchangeable with the
> >exception of the bolt. The longer stroke 2.1 cranks in combination with
> the
> >1.9 rod bolts can but do not always hit the camshaft
> >The 2.1 rod bolt work well for 150K and I have seen these stretch to yield
> >bolts reused with failing.
> >2.1 rods distort over time by this I mean the big end is no longer round.
> >The cap shifts and the big end gets smaller opposite the parting line.
> >Another way to say that is if you draw a line down the rod from the small
> >end threw the beam of the rod threw the big end the circle is smaller at
> >that point. So just replacing the bolts is not the cure for the 2.1 rod
> >problem. The big end needs to be resized to do this I have a cap grinder
> it
> >trims a few thousandths off of the mating surfaces of both the rod and
> cap.
> >After deburing the hole and installing new non stretch to yield bolts and
> >reassembling the rod I torque the nuts and resize the big end with a
> sunnen
> >rod hone. Machine shops have spec books to provide dimensions for the
> >finished size.
>
> >>snip<<
>

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