Today's Message Index:
----------------------
1. 05:53 AM - G Meter (Thomas Smith)
2. 04:26 PM - engine roughness part 2 (Philip Nicholson)
3. 04:53 PM - Re: engine roughness part 2 (Michael Beach)
4. 05:57 PM - Re: engine roughness part 2 (pnicholson)
5. 06:08 PM - Re: engine roughness part 2 (pnicholson)
6. 08:59 PM - Re: engine roughness part 2 (cjpilot710@aol.com)
Message 1
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Need to get a G meter for a Yak 52.- Anyone have on that works?- If so,
contact me.=0A=0Athomas_csmith@yahoo.com=0A
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| Subject: | engine roughness part 2 |
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 3
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| Subject: | engine roughness part 2 |
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
Subject: Yak-List: engine roughness part 2
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
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Message 4
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| Subject: | 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 5
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| Subject: | Re: engine roughness part 2 |
One last thing, the engine is more difficult to start than before.... typically
takes 3-4 attempts and alot of fuel
Cheers,
Phil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=356368#356368
Message 6
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| Subject: | Re: engine roughness part 2 |
Philip,
I think you should check that primer again. If it is NOT closing the
valve at the bottom, it will pass fuel and give #9 cylinder way to much fuel.
I've seen primers do just that. They looked closed and lock but were not.
You will get the very indications you are describing.
Also even with bad rings, a cylinder will fire and be almost as warm as
the others. Doing a compression test is not hard, but may tell you if #9
cylinder has bad valves or they are badly out of adjustment, or the rings are
totally shot.
Jim "Pappy" Goolsby
In a message dated 10/30/2011 7:26:19 P.M. Eastern Daylight Time,
pednicholson@gmail.com writes:
--> 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
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