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Tach needle wobbles

 
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Penco



Joined: 14 Dec 2018
Posts: 7
PostPosted: Tue Mar 23, 2021 6:57 am    Post subject: Tach needle wobbles Reply with quote
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

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heaysr(at)telus.net
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PostPosted: Tue Mar 23, 2021 8:15 am    Post subject: Tach needle wobbles Reply with quote
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(at)gmail.com (osipenco(at)gmail.com)> wrote:

Quote:
--> Yak-List message posted by: "Penco" <osipenco(at)gmail.com (osipenco(at)gmail.com)>

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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Penco



Joined: 14 Dec 2018
Posts: 7
PostPosted: Tue Mar 23, 2021 9:04 am    Post subject: Re: Tach needle wobbles Reply with quote
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.

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markbitterlich(at)embarqm
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PostPosted: Tue Mar 23, 2021 9:11 am    Post subject: Tach needle wobbles Reply with quote
There is a common problem with the Tach Generator plug, on the Tach Generator itself that might be causing your problem, especially if both Tach gages are doing the same thing.

Take the cannon plug off the Tach Gen and carefully take it apart. Desolder one wire at a time, pull it out, heat and then tap solder cup in plug. Then reinsert the wire and resolver with quality rosin core solder. Repeat process for the other wires. 
Caution: Be extremely cautious with the shield to reinstall it properly as well.  Failing to do so will result in EXTREME radio noise. 
Mark
P.s. Not a guarantee,  but this is the first place to start. Unhooked one Tach gage at a time also might be worth observing. 
-------- Original message --------
From: Penco <osipenco(at)gmail.com>
Date: 3/23/21 12:47 PM (GMT-05:00)
To: yak-list(at)matronics.com
Subject: Yak-List: Tach needle wobbles

--> Yak-List message posted by: "Penco" <osipenco(at)gmail.com>

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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Penco



Joined: 14 Dec 2018
Posts: 7
PostPosted: Tue Mar 23, 2021 10:35 am    Post subject: Re: Tach needle wobbles Reply with quote
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

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draftsjust417(at)gmail.co
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PostPosted: Tue Mar 23, 2021 3:11 pm    Post subject: Tach needle wobbles Reply with quote
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(at)gmail.com (osipenco(at)gmail.com)> wrote:

Quote:
--> Yak-List message posted by: "Penco" <osipenco(at)gmail.com (osipenco(at)gmail.com)>

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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rel="noreferrer" target="_blank">http://www.matronics.com/contribution
===========





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dsavarese0812(at)bellsout
Guest
PostPosted: Wed Mar 24, 2021 6:51 am    Post subject: Tach needle wobbles Reply with quote
Mark is right on the money.  This is a very common problem with the tach
generator on the M14.  Do exactly as Mark has described and very likely
you'll solve the problem.

A. Dennis Savarese
334-546-8182
www.yak-52.com

On 3/23/2021 1:11 PM, Mark Bitterlich wrote:
Quote:
There is a common problem with the Tach Generator plug, on the Tach
Generator itself that might be causing your problem, especially if
both Tach gages are doing the same thing.

Take the cannon plug off the Tach Gen and carefully take it apart.
Desolder one wire at a time, pull it out, heat and then tap solder cup
in plug. Then reinsert the wire and resolver with quality rosin core
solder. Repeat process for the other wires.

Caution: Be extremely cautious with the shield to reinstall it
properly as well.  Failing to do so will result in EXTREME radio noise.

Mark

P.s. Not a guarantee,  but this is the first place to start. Unhooked
one Tach gage at a time also might be worth observing.

-------- Original message --------
From: Penco <osipenco(at)gmail.com>
Date: 3/23/21 12:47 PM (GMT-05:00)
To: yak-list(at)matronics.com
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



- The Matronics Yak-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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