Engine rough and dies at idle.

[Marauder]

Like this?




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You call that a picture?


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[Marauder]

What the original poster posted sounds like the sniffle valve may be gummed up. 

Is this sniffle valve the vent he cleaned out? Just curious where on the divider this vent is.


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[Guitarmaster]

Worked like a charm!

Yes, the sniffle valve was freed up and cleaned about 6 months ago.

In addition, I've been having problems with it misfiring at idle periodically. That does not seem to be happening anymore.

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[Marauder]

Worked like a charm!

Yes, the sniffle valve was freed up and cleaned about 6 months ago.

In addition, I've been having problems with it misfiring at idle periodically. That does not seem to be happening anymore.

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Learned something today. How far in did you go?


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[Mooneymite]

Just now, Marauder said:

 

Learned something today. How far in did you go?


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THAT is a totally inappropriate question on this forum!

 

[Guitarmaster]

Learned something today. How far in did you go?

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So. Many. Jokes... Must. Stay. On. Topic...

Just till it stopped. Pulled out a little and worked it around.

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[Marauder]

So. Many. Jokes... Must. Stay. On. Topic...
Just till it stopped. Pulled out a little and worked it around.
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I'm glad you appreciate the humor. I could post something that you will never find the hole on, but I'm being a good Marauder today.


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[Marauder]

THAT is a totally inappropriate question on this forum!
 

At least it seems Riley enjoyed the experience. Noticed how he very carefully pointed out the size to use. We all know it is about girth not length that counts.


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[Marauder]

What really is troubling is that tiny vent could cause all of this.


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[takair]

I always thought the "sniffle valve" was the ball check valve in the bottom of the case, draining the intake manifold of fuel on the ground?  

[Guitarmaster]

At least it seems Riley enjoyed the experience. Noticed how he very carefully pointed out the size to use. We all know it is about girth not length that counts.


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She enjoyed it very much!

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[Guitarmaster]

What really is troubling is that tiny vent could cause all of this.


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Agreed. I guess when it gets plugged it does not allow the spring to close thereby allowing more fuel than the engine can handle at lower power settings. The "dieseling" is because the ball will not seat, allowing fuel to continue to flow. Technically it's not dieseling since the Magneto's are still firing and that's was lighting the fuel off.

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[MyNameIsNobody]

Do you rub the wire to straighten it before insertion into the hole?

 

This thread is so Mooney porn....

So educational.  I am learning more than health class back in the day

 

[MyNameIsNobody]

Do you lubricate the wire before insertion?  Does age matter on the wire?  Did the engine provide any feedback after insertion?  Are loud noise or quiet humming to be expected during and after or just smooth running and quiet the key to know you are doing/did "it" right?

[Guitarmaster]

I always thought the "sniffle valve" was the ball check valve in the bottom of the case, draining the intake manifold of fuel on the ground?  

It is. Mine was frozen up last year.

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[Guest]

The flow divider divides fuel delivered from the servo equally between all cylinders and provides positive fuel cut off when fuel pressure from the servo drops.  The plunger is a very close fit in the body and sometimes it sticks.

Poor cut off and dieseling is usually caused by a sticking plunger in the flow divider.  A blocked vent hole should cause un commanded leaning as the plane climbs, the air trapped above the diaphram expands pushing the plunger closed.

But I do like the stiff wire insertion stories, is there any coincidence that 100 LL is Viagra blue?

Clarence

[Marauder]

1 hour ago, M20Doc said:

The flow divider divides fuel delivered from the servo equally between all cylinders and provides positive fuel cut off when fuel pressure from the servo drops.  The plunger is a very close fit in the body and sometimes it sticks.

Poor cut off and dieseling is usually caused by a sticking plunger in the flow divider.  A blocked vent hole should cause un commanded leaning as the plane climbs, the air trapped above the diaphram expands pushing the plunger closed.

But I do like the stiff wire insertion stories, is there any coincidence that 100 LL is Viagra blue?

Clarence

I got an idea. Can your customers start paying you in Viagra pills? Instead of a 1000AMU, it could be 22.5PILLS  (According to the CVS website, they are currently $44.70 per tablet) .

[Dham]

On 11/14/2016 at 1:00 PM, N201MKTurbo said:

Glad to see you are taking care of my old friend! Hope you get the engine straightened out soon.

Looks like someone used teflon on fittings of the spider causing fuel flow issue which over heated #3 to 700deg. Sending spider of to be checked and pulling #3 for repair. (Just had all four cylinders replaced in sept. ) JOY!

[carusoam]

Teflon tape for sealing is not on the Mooney acceptable parts list.  It has a tendency to show up down stream where it doesn't belong.

Real Mooney parts do not require Teflon tape to seal properly.  If tape is needed, the part probably has been damaged.

Try to find out which shop did this, so you can avoid them.

PP advice only, not a mechanic...

Best regards,

-a-

[Guest]

On November 14, 2016 at 5:01 PM, Guitarmaster said:

Worked like a charm!

Yes, the sniffle valve was freed up and cleaned about 6 months ago.

In addition, I've been having problems with it misfiring at idle periodically. That does not seem to be happening anymore.

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In your first picture it looks like the solder joint on the cylinder 1 fuel line at the flow divider is cracked.  Check Lycoming SB 342G.

Clarence

[Guitarmaster]

In your first picture it looks like the solder joint on the cylinder 1 fuel line at the flow divider is cracked.  Check Lycoming SB 342G.
Clarence

Thank you Clarence. I will check that!!

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[carusoam]

Matt,

While you are in there...

put an extra eye on the divider.  The lower left line / threads in the last photo looks to have some dried fuel remnants as if it has leaked.  The other lines appear to be a bit cleaner...?

Best regards,

-a-

 

[bradp]

Would someone mind putting an arrow on the solder line crack that Clarence pointed to and the fuel stains that Anthony pointed to.  My eyes must be bad.  Im just not seeing it.  

[carusoam]

Unable to edit picture...

there are two elbow fittings that have markings on them.  The clean one is clearly marked AN. The one in question is marked something like FE?  Inverted in the photo, not in good focus.

but looking at the gray paint on the device that supports all the threaded fittings, there is the lower left fitting (FE?) that seems to have more of a dark halo around it.  Closer to the fitting it is darker brown, further away it looks blue-ish...  similar to the way fuel stains work...

a bright light, and some cleaning supplies would reveal if fuel stains are being cleaned off, or just dirt accumulation...

It is possible that it is just an artifact of the lighting conditions.  It is a challenge to compare each fitting in the photo because of all the various light angles...  and the gray paint doesn't help the eye looking for a blue-ish stain...

hope that helps to explain what I think I may be seeing with PP eyes that are not nearly as good as Clarence's.

Best regards,

-a-

 

[bradp]

Thanks Anthony - I can see what you're talking about if I turn the screen brightness all the way up. I'm a battery CB. :-).
@m20doc Clarence what's the giveaway for a solder line crack?


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