Yep, that was the first thing we did. :-)
--- In [email protected], Bill BIGGS <webacr...@...> wrote:
>
>
> Did you do a cold cylinder test?
>
>
>
> Start the cold engine and switch immediately to the rough mag. Let it run for
> 30 seconds or so and shut down.
>
>
>
> spit on your finger and check each exhaust pipe right near the cylinder.
> (like youi check for a hot iron)
>
>
>
> If one cylinder doesn't "sizzle" you have isolated the problem to the
> cylinder, plug, wire or mag internal "distributor cap" (could be cracked or
> carbon tracking on that cylinder)
>
>
>
> If all cylinders are equal in temp its the mag. Could be coil, condenser or
> points. Did the mechanic set the internal timing on the mag?
>
>
>
> Bill
>
>
>
>
>
> ----- Original Message -----
> From: Bill BIGGS
> To: bigbrownpi...@...
> Sent: Monday, October 12, 2009 8:47 PM
> Subject: RE: [ercoupe-tech] Running rough on Right Mag
>
> Just a suggestion.
>
> First thing, be sure you are looking at the correct mag.
>
> Have many times seen the P-Leads crossed and guy was working on the wrong
> mag. Like a dog chasing it's tail.
>
> Run a tempory wire (with an alligator clip is best) from the left mag into
> the cockpit. Start engine and switch to RIGHT mag. Ground the wire running to
> left mag to the fuselage. If engine dies, your P-Leads are crossed.
>
> Bill
>
>
>
>
> To: [email protected]
> From: bigbrownpi...@...
> Date: Mon, 12 Oct 2009 23:32:17 +0000
> Subject: [ercoupe-tech] Running rough on Right Mag
>
>
>
>
> Folks,
>
> Back at the end of August, I flew down to Houston and Alan Fairclough and I
> fixed an oil leak from my #2 pushrod tubes. On the way back, I noticed an
> intermittent miss. The miss was not present the next time I went to fly and
> my mag drop was normal on both mags at run-up. We landed and went to take off
> again while the engine was still warm, and I had a large mag drop and rough
> performance on the right mag so I was able to narrow it down to a problem on
> the right ignition. I saw that the upper magneto harness had missing
> insulation and braided wire showing, so I replaced both mag harnesses and
> thought I had fixed the problem. Next flight, same problem-- minimal mag drop
> during the ground run-up on both L&R, then an intermittent miss on the right
> after about 15 minutes of flying. Selecting the right mag when the engine was
> fully warmed up led to running rough and a large mag drop. (Somewhere in here
> we also found the problem with the alternator and voltage regulator having
> been wired incorrectly and installed a new Plane Power STC'ed alternator and
> regulator). First, my A&P swapped upper and lower plugs and the problem
> stayed on the right mag. Then he did a rebuild on the Bendix mag, we re-timed
> everything and checked it with a mag timing box twice. The next time we went
> to fly, the engine ran rough on the right mag when cold, and the problem
> cleared up when the engine was warmed up; just the opposite of the original
> problem. We swapped plugs again, and the problem stayed on the right
> ignition. Now we're thinking it's the coil on the right mag because that's
> the only thing left. Any other ideas? Just to recap-- originally OK cold and
> running rough hot; after the mag rebuild, rough cold and OK hot.
>
> Thanks,
> Dave
>
>
>
>
>
>
>
>
>
>
>
>
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