'79 240D Ring Gear repaired

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runbiodiesel - 17 Oct 2007 19:18 GMT

I post this in case it's useful for anyone else with this problem. I
posted earlier about the ring gear slipping on the flywheel to which
it is attached by friction fit.

The ring gear was not cracked or damaged in any way. So, usually this
means a new flywheel. Hard to find it seems. So, I took the ring gear
and flywheel to a welder and the welded the ring gear to the flywheel
along the leading edge where they meet then ground the weld down to
make sure it would not interfere.

It's installed now and works like a charm. Thanks for the ideas from
several of you for dealing with this. I hope this helps someone in
future.
Steve

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-->> T.G. Lambach <<-- - 17 Oct 2007 19:39 GMT

What a good outcome, thanks for the information.

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Karl - 17 Oct 2007 22:27 GMT

How did he balance it?

> I post this in case it's useful for anyone else with this problem. I
> posted earlier about the ring gear slipping on the flywheel to which
[quoted text clipped - 10 lines]
> future.
> Steve

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runbiodiesel - 18 Oct 2007 07:37 GMT

> How did he balance it?
>
[quoted text clipped - 14 lines]
>
> - Show quoted text -

Well . . . the truth is he didn't. The welder made four separate
welds. We carefully made sure they were all 90 degrees apart on center
and of equal length (about 2 inches). Beyond that, no balancing. So
it's probably not perfect (given the possibility of a slightly larger
weld bead) but it's good enough. I just got back this evening and was
on the highway cruising at 75mph and she purrs and flies. Smooth idle
too.

Also, I forgot to mention that at each weld point we ground a "V" into
the metal where the ring gear and flywheel meet so the weld bead could
be large enough to hold even when ground flat afterwards. There is
little clearance to the engine so it can't stick up much.

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