Today's Message Index:
----------------------
1. 07:57 AM - Tach needle wobbles (Penco)
2. 09:15 AM - Re: Tach needle wobbles (Royden Heays)
3. 10:04 AM - Re: Tach needle wobbles (Penco)
4. 10:11 AM - Re: Tach needle wobbles (Mark Bitterlich)
5. 11:35 AM - Re: Tach needle wobbles (Penco)
6. 04:11 PM - Re: Tach needle wobbles (Justin Drafts)
Message 1
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| Subject: | Tach needle wobbles |
Hello,
I'm encountering an issue with my RPM gauge on a Yak-52. It wobbles. I tried tightening
everything on the engine pickup and it seemed to fix the trouble but
after a few minutes of warmup, the wobble is back. Though nothing seems to have
loosened up after I shutdown the engine. Do you guys have an idea where it might
come from ?
Below are the videos of the effect.
First one a couple minutes after start, second one after about ten minutes of warming
up.
https://streamable.com/ojz5d0
https://streamable.com/vd4zex
Cheers,
Alex
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501064#501064
Message 2
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| Subject: | Re: Tach needle wobbles |
My guess is that the Tach is reading correctly and that one or two
cylinders are not firing perfectly evenly. At those low RPM it is hard to
pick up uneven firing. I have learned that a slightly fluctuating Tach
needle is a very good indicator of something partially awry with one of
more cylinders. Try and emulate conditions and then do a mag check. That
might tell you if it is a mag problem as in coils starting to
intermittently fail
Royden
Yak 55M
On Tue, Mar 23, 2021 at 8:14 AM Penco <osipenco@gmail.com> wrote:
>
> Hello,
>
> I'm encountering an issue with my RPM gauge on a Yak-52. It wobbles. I
> tried tightening everything on the engine pickup and it seemed to fix the
> trouble but after a few minutes of warmup, the wobble is back. Though
> nothing seems to have loosened up after I shutdown the engine. Do you guys
> have an idea where it might come from ?
>
> Below are the videos of the effect.
> First one a couple minutes after start, second one after about ten minutes
> of warming up.
>
> https://streamable.com/ojz5d0
>
> https://streamable.com/vd4zex
>
> Cheers,
> Alex
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=501064#501064
>
>
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| Subject: | Re: Tach needle wobbles |
Hello,
I tried it also at higher RPM and same thing. Plus I've tried mags and everything
runs normally on that front. I'm almost positive it's the instrument and not
the engine.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501071#501071
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| Subject: | Tach needle wobbles |
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| Subject: | Re: Tach needle wobbles |
Ok guys, thanks. Since it is still usable as is and it seems to be a delicate job,
I'll wait until I find a professional to give me a hand.
Cheers
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501073#501073
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| Subject: | Re: Tach needle wobbles |
I had similar issues with my CJ6's tachometer, and a very good cleaning of
the cannon plug w/ contact cleaner, inside and out
(especially where the wiring fed into the back of the C/P), did the trick.
Works perfectly now.
It had been exposed to the oily "climate" pof the engine for awhile, and
I'm sure oily residue was the culprit.
Hope this helps - Justin Drafts
On Tue, Mar 23, 2021 at 7:33 PM Penco <osipenco@gmail.com> wrote:
>
> Hello,
>
> I'm encountering an issue with my RPM gauge on a Yak-52. It wobbles. I
> tried tightening everything on the engine pickup and it seemed to fix the
> trouble but after a few minutes of warmup, the wobble is back. Though
> nothing seems to have loosened up after I shutdown the engine. Do you guys
> have an idea where it might come from ?
>
> Below are the videos of the effect.
> First one a couple minutes after start, second one after about ten minutes
> of warming up.
>
> https://streamable.com/ojz5d0
>
> https://streamable.com/vd4zex
>
> Cheers,
> Alex
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=501064#501064
>
>
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