Today's Message Index:
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1. 04:50 AM - Re: engine roughness part 2 (A. Dennis Savarese)
2. 05:44 AM - Re: Re: engine roughness part 2 (Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E)
3. 06:00 AM - Re: Re: engine roughness part 2 (A. Dennis Savarese)
4. 06:11 AM - Re: Re: engine roughness part 2 (Didier Blouzard)
5. 10:58 AM - Desert Thunder Patch - Soon in the RPA Store (Byron Fox)
Message 1
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| Subject: | Re: engine roughness part 2 |
Michael is right on the money. Very likely a plug lead. Trying to
replace one lead can end up being a real nightmare. If you'd like more
information on the automotive conversion kit which Michael spoke about,
you can read about it here.
http://www.yak-52.com/plug_conversion.htm
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 10/30/2011 6:50 PM, Michael Beach wrote:
> --> Yak-List message posted by: "Michael Beach"<mbeach@hartwigs.com.au>
>
> Hi Phil, check your plug lead, We had a yak over here that had rubbed the
> lead and would run rough and miss under certain
> Situation. Fitted an aftermarket kit now runs like a dream. When we
> inspected the old lead we found arcing in the metal tubes on the bends.
>
> REGARDS
>
> MICHAEL BEACH
> SERVICE MANAGER
> HARTWIGS
> 1 TRAVEL STOP WAY
> LAVINGTON
> NSW 2641
>
> PH 0260496044
> FAX 0260496055
> MOBILE 0427692366
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of Philip Nicholson
> Sent: Monday, 31 October 2011 10:23 AM
> To: yak-list@matronics.com
> Subject: Yak-List: engine roughness part 2
>
> --> Yak-List message posted by: Philip Nicholson<pednicholson@gmail.com>
>
> Hi again,
> some weeks ago, I reported engine roughness on deceleration on
> final. (Housai 6A). In short, anything over 1000rpm and higher it
> runs fairly smooth, the higher the revs the better. But at idle, the
> engine is very rough, panel shakes etc.
> Since then a bit of exploration.
> I confirmed that the primer is off and down.
> On run-up rythmic poof of black smoke (assume unburnt fuel on one cylinder)
> The oil screen filter was clear of metals (bit of goop), the gas
> filter is clear of sediment and water.
> We found that number nine cylinder is not firing properly and is just
> luke warm after 10 minutes idle. The plugs seem OK though the rear
> plug had a bit of carbon between the gap on pluig. We cleaned them
> all up and reinserted, same problem.
> So, my hangar mate things compression test is next (rings?) Is there
> anything else that I should be persuing?
>
> Thanks,
>
> Philip Nicholson
>
> Nanchang - C-FEPN
>
>
Message 2
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| Subject: | Re: engine roughness part 2 |
Remove the spark plug lead from the spark plug. Wet your finger and
grab hold of the small spring at the end. Make sure you lick your
finger first.
With your other hand, grab any handy part of bare metal on the airframe.
Stand clear of prop.
Have observer standing by with audio level meter.
When the engine first cranks have the observer record in Db the level of
the scream emitting from test subject.
Note that after engine starts and RPM is increased, screams should vary
in intensity according to engine RPM. The reason for this is due to the
relatively weak spark used for starting compared to the more powerful
spark from the mag while running. Additionally, spark energy tends to
increase with engine RPM, and with careful attention, the it will be
noted that the PITCH of test subjects scream will indeed vary with
engine RPM.
Sorry. Could not resist.
Make sure you switch the spark plugs from this cylinder to another
cylinder just to eliminate any possible chance of bad plugs. There are
indeed spark plug wire testers that will check for breakdown. Most A&P
mechanics keep one in their box. Failing that, try to get your hands on
a Megger and try that. Pappy says check the primer again... which makes
sense. Dennis and others suggest possible spark plugs leads.... also
VERY possible. As to the engine having two spark plugs and wires .....
good point. Until you remember that you don't often run a mag check at
idle.
You have already stated that the engine seems to run OK at higher power
level settings. You could have had one plug wire (or plug) bad at idle
for quite some time and just never knew it because the other one was
working.
Run mag checks using mag switch at various power settings, from idle on
up and note what you see.
If you think your primer is off ... turn it on and see if you notice a
difference. The engine should run rougher at idle with it on, and
should clear up when you turn it off, check this.
Do you have an intake clean kit? The one with hoses that connect the
lower cylinders and then go to a drain to allow oil to drip out when the
engine is just sitting there? If you do, just for the heck of it, check
to make sure it has no leaks, or something is broken.
Of course run a compression check.
Good luck
Mark
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of pnicholson
Sent: Sunday, October 30, 2011 8:53 PM
Subject: Yak-List: Re: engine roughness part 2
Hi Michael,
thanks for the quick response. But if there are two leads, two
mags and two plugs for each cylinder, would it matter if one lead was
shorting?
Is there any way to check for lead current? (novice :-))
Thanks,
Phil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=356367#356367
Message 3
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| Subject: | Re: engine roughness part 2 |
My sides are hurting from laughing so hard Mark! Great way to start off
the work week.....with a good hard laugh.
Dennis
A. Dennis Savarese
334-285-6263
334-546-8182 (cell)
Skype: Yakguy1
www.yak-52.com
On 10/31/2011 7:42 AM, Bitterlich, Mark G CIV Det Cherry Point, MALS-14
64E wrote:
> --> Yak-List message posted by: "Bitterlich, Mark G CIV Det Cherry Point, MALS-14
64E"<mark.bitterlich@navy.mil>
>
> Remove the spark plug lead from the spark plug. Wet your finger and
> grab hold of the small spring at the end. Make sure you lick your
> finger first.
>
> With your other hand, grab any handy part of bare metal on the airframe.
>
>
> Stand clear of prop.
>
> Have observer standing by with audio level meter.
>
> When the engine first cranks have the observer record in Db the level of
> the scream emitting from test subject.
>
> Note that after engine starts and RPM is increased, screams should vary
> in intensity according to engine RPM. The reason for this is due to the
> relatively weak spark used for starting compared to the more powerful
> spark from the mag while running. Additionally, spark energy tends to
> increase with engine RPM, and with careful attention, the it will be
> noted that the PITCH of test subjects scream will indeed vary with
> engine RPM.
>
> Sorry. Could not resist.
>
>
> Make sure you switch the spark plugs from this cylinder to another
> cylinder just to eliminate any possible chance of bad plugs. There are
> indeed spark plug wire testers that will check for breakdown. Most A&P
> mechanics keep one in their box. Failing that, try to get your hands on
> a Megger and try that. Pappy says check the primer again... which makes
> sense. Dennis and others suggest possible spark plugs leads.... also
> VERY possible. As to the engine having two spark plugs and wires .....
> good point. Until you remember that you don't often run a mag check at
> idle.
>
> You have already stated that the engine seems to run OK at higher power
> level settings. You could have had one plug wire (or plug) bad at idle
> for quite some time and just never knew it because the other one was
> working.
>
> Run mag checks using mag switch at various power settings, from idle on
> up and note what you see.
>
> If you think your primer is off ... turn it on and see if you notice a
> difference. The engine should run rougher at idle with it on, and
> should clear up when you turn it off, check this.
>
> Do you have an intake clean kit? The one with hoses that connect the
> lower cylinders and then go to a drain to allow oil to drip out when the
> engine is just sitting there? If you do, just for the heck of it, check
> to make sure it has no leaks, or something is broken.
>
> Of course run a compression check.
>
> Good luck
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of pnicholson
> Sent: Sunday, October 30, 2011 8:53 PM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: engine roughness part 2
>
> --> Yak-List message posted by: "pnicholson"<pednicholson@gmail.com>
>
> Hi Michael,
> thanks for the quick response. But if there are two leads, two
> mags and two plugs for each cylinder, would it matter if one lead was
> shorting?
> Is there any way to check for lead current? (novice :-))
> Thanks,
> Phil
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=356367#356367
>
>
Message 4
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| Subject: | Re: engine roughness part 2 |
EXCELLENT Mark
Sorry but you might have heard my laugh from the other side of the ocean!!!
Hope it did not wake you up !!!
I know a few people who can play the tester role here.
Have a very good day
Didier
2011/10/31 Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E <
mark.bitterlich@navy.mil>
> MALS-14 64E" <mark.bitterlich@navy.mil>
>
> Remove the spark plug lead from the spark plug. Wet your finger and
> grab hold of the small spring at the end. Make sure you lick your
> finger first.
>
> With your other hand, grab any handy part of bare metal on the airframe.
>
>
> Stand clear of prop.
>
> Have observer standing by with audio level meter.
>
> When the engine first cranks have the observer record in Db the level of
> the scream emitting from test subject.
>
> Note that after engine starts and RPM is increased, screams should vary
> in intensity according to engine RPM. The reason for this is due to the
> relatively weak spark used for starting compared to the more powerful
> spark from the mag while running. Additionally, spark energy tends to
> increase with engine RPM, and with careful attention, the it will be
> noted that the PITCH of test subjects scream will indeed vary with
> engine RPM.
>
> Sorry. Could not resist.
>
>
> Make sure you switch the spark plugs from this cylinder to another
> cylinder just to eliminate any possible chance of bad plugs. There are
> indeed spark plug wire testers that will check for breakdown. Most A&P
> mechanics keep one in their box. Failing that, try to get your hands on
> a Megger and try that. Pappy says check the primer again... which makes
> sense. Dennis and others suggest possible spark plugs leads.... also
> VERY possible. As to the engine having two spark plugs and wires .....
> good point. Until you remember that you don't often run a mag check at
> idle.
>
> You have already stated that the engine seems to run OK at higher power
> level settings. You could have had one plug wire (or plug) bad at idle
> for quite some time and just never knew it because the other one was
> working.
>
> Run mag checks using mag switch at various power settings, from idle on
> up and note what you see.
>
> If you think your primer is off ... turn it on and see if you notice a
> difference. The engine should run rougher at idle with it on, and
> should clear up when you turn it off, check this.
>
> Do you have an intake clean kit? The one with hoses that connect the
> lower cylinders and then go to a drain to allow oil to drip out when the
> engine is just sitting there? If you do, just for the heck of it, check
> to make sure it has no leaks, or something is broken.
>
> Of course run a compression check.
>
> Good luck
>
> Mark
>
>
> -----Original Message-----
> From: owner-yak-list-server@matronics.com
> [mailto:owner-yak-list-server@matronics.com] On Behalf Of pnicholson
> Sent: Sunday, October 30, 2011 8:53 PM
> To: yak-list@matronics.com
> Subject: Yak-List: Re: engine roughness part 2
>
>
> Hi Michael,
> thanks for the quick response. But if there are two leads, two
> mags and two plugs for each cylinder, would it matter if one lead was
> shorting?
> Is there any way to check for lead current? (novice :-))
> Thanks,
> Phil
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=356367#356367
>
>
--
____________________________
Didier BLOUZARD
Portable : +33 6 24 24 36 72
Email: didier.blouzard@gmail.com <didier.blouzard@anolistech.fr>
Message 5
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| Subject: | Desert Thunder Patch - Soon in the RPA Store |
These should be available in about two weeks. Standby!
--
... Blitz
Byron M. Fox
RPA Online Store
80 Milland Drive
Mill Valley, CA 94941
415-307-2405
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