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GOLDPILOT(at)AOL.COM
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 Posted: Sat Jan 22, 2011 5:00 pm Post subject: Fwd: engine advice needed |
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| Quote: | From: david(at)newlangsyne.com
To: goldpilot(at)aol.com
Sent: 1/22/2011 5:27:23 A.M. Pacific Standard Time
Subj: engine advice needed
Would you be kind enough to forward this to the Grumman Gang?
The guy who needs the information will be able to see it.
Thanks.
--------------------------------------------------------------
I'm looking for advice about two engines.
Tiger #1: 1979 AA-5B Lyc O-360-A4K (carbureted)
Tiger #2: 1991 AG-5B Lyc O-360-A4K (carbureted)
Each has developed the same problem, about 30 hours after being overhauled.
If the throttle is advanced rapidly, the engine sometimes (not always)
stumbles, almost dies, and THEN responds. Sounds like a problem with the
accelerator pump, doesn't it?
But...
Ops normal for the first several hours after overhaul, which used new
cylinders and included new intake manifolds.
Tiger #1 has had two new (overhauled) carbs since the problem
appeared, same problem.
Tiger #2 has had FOUR carbs since the problem appeared, same problem.
three fresh overhauled
one was the carburetor that was working fine on Tiger #1 just before
its engine went in for overhaul
We (two flying clubs) have been using the same engine shop for at least a
dozen engines over the past 15 years or more. We've followed his recommended
break-in procedures with each engine. The only difference is that he
recommended Phillips 20W50 to break in Tiger #1 (most recent overhaul), where
we always used Shell mineral oil before. I think Philips 20W50 oil was used
for Tiger #2 also, but I'm not sure.
The owner has
- swapped carburetors as already described
- checked carb heat boxes
- isolated primer lines
Any ideas? I'm looking for something that
- mimics a bad accelerator pump but is something else
- didn't start until about 30 hours after engine overhaul
Thanks for your collective wisdom. This one is very frustrating.
|
[quote][b]
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andy747(at)charter.net
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| Posted: Sat Jan 22, 2011 5:44 pm Post subject: Fwd: engine advice needed |
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Are the symptoms the same with the boost pump on ?
[quote] ---
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pitts_pilot(at)bellsouth.
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| Posted: Sat Jan 22, 2011 5:53 pm Post subject: Fwd: engine advice needed |
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I go with the accelerator pump too. Take the carbs off and hook up a temporary fuel source. Exercise the accelerator pump and look at the fuel expended in the throat. I'm guessing you'll find a poor amount of fuel. Take the carbs apart yourselves and clean out the passage from the pump to the throat. I'd also make sure that pump really belongs in that carb ....... should be obvious. I doubt the rebuilders catch either one, making the same mistake each time.
Linn
On 1/22/2011 7:57 PM, GOLDPILOT(at)AOL.COM (GOLDPILOT(at)AOL.COM) wrote: [quote]
| Quote: | From: david(at)newlangsyne.com (david(at)newlangsyne.com)
To: goldpilot(at)aol.com (goldpilot(at)aol.com)
Sent: 1/22/2011 5:27:23 A.M. Pacific Standard Time
Subj: engine advice needed
Would you be kind enough to forward this to the Grumman Gang?
The guy who needs the information will be able to see it.
Thanks.
--------------------------------------------------------------
I'm looking for advice about two engines.
Tiger #1: 1979 AA-5B Lyc O-360-A4K (carbureted)
Tiger #2: 1991 AG-5B Lyc O-360-A4K (carbureted)
Each has developed the same problem, about 30 hours after being overhauled.
If the throttle is advanced rapidly, the engine sometimes (not always)
stumbles, almost dies, and THEN responds. Sounds like a problem with the
accelerator pump, doesn't it?
But...
Ops normal for the first several hours after overhaul, which used new
cylinders and included new intake manifolds.
Tiger #1 has had two new (overhauled) carbs since the problem
appeared, same problem.
Tiger #2 has had FOUR carbs since the problem appeared, same problem.
three fresh overhauled
one was the carburetor that was working fine on Tiger #1 just before
its engine went in for overhaul
We (two flying clubs) have been using the same engine shop for at least a
dozen engines over the past 15 years or more. We've followed his recommended
break-in procedures with each engine. The only difference is that he
recommended Phillips 20W50 to break in Tiger #1 (most recent overhaul), where
we always used Shell mineral oil before. I think Philips 20W50 oil was used
for Tiger #2 also, but I'm not sure.
The owner has
- swapped carburetors as already described
- checked carb heat boxes
- isolated primer lines
Any ideas? I'm looking for something that
- mimics a bad accelerator pump but is something else
- didn't start until about 30 hours after engine overhaul
Thanks for your collective wisdom. This one is very frustrating.
|
[b]
| | - The Matronics TeamGrumman-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:
http://www.matronics.com/Navigator?TeamGrumman-List |
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flyadive(at)gmail.com
Guest
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| Posted: Sun Jan 23, 2011 8:41 am Post subject: Fwd: engine advice needed |
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Linn:
An external source for fuel is not needed, there is more than enough fuel in the float bowl and you will have 20 or more pumps before it goes low.
Barry
On Sat, Jan 22, 2011 at 8:51 PM, Linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)> wrote:
[quote] I go with the accelerator pump too. Take the carbs off and hook up a temporary fuel source. Exercise the accelerator pump and look at the fuel expended in the throat. I'm guessing you'll find a poor amount of fuel. Take the carbs apart yourselves and clean out the passage from the pump to the throat. I'd also make sure that pump really belongs in that carb ....... should be obvious. I doubt the rebuilders catch either one, making the same mistake each time.
Linn
On 1/22/2011 7:57 PM, GOLDPILOT(at)AOL.COM (GOLDPILOT(at)AOL.COM) wrote: | Quote: |
| Quote: | From: david(at)newlangsyne.com (david(at)newlangsyne.com)
To: goldpilot(at)aol.com (goldpilot(at)aol.com)
Sent: 1/22/2011 5:27:23 A.M. Pacific Standard Time
Subj: engine advice needed
Would you be kind enough to forward this to the Grumman Gang?
The guy who needs the information will be able to see it.
Thanks.
--------------------------------------------------------------
I'm looking for advice about two engines.
Tiger #1: 1979 AA-5B Lyc O-360-A4K (carbureted)
Tiger #2: 1991 AG-5B Lyc O-360-A4K (carbureted)
Each has developed the same problem, about 30 hours after being overhauled.
If the throttle is advanced rapidly, the engine sometimes (not always)
stumbles, almost dies, and THEN responds. Sounds like a problem with the
accelerator pump, doesn't it?
But...
Ops normal for the first several hours after overhaul, which used new
cylinders and included new intake manifolds.
Tiger #1 has had two new (overhauled) carbs since the problem
appeared, same problem.
Tiger #2 has had FOUR carbs since the problem appeared, same problem.
three fresh overhauled
one was the carburetor that was working fine on Tiger #1 just before
its engine went in for overhaul
We (two flying clubs) have been using the same engine shop for at least a
dozen engines over the past 15 years or more. We've followed his recommended
break-in procedures with each engine. The only difference is that he
recommended Phillips 20W50 to break in Tiger #1 (most recent overhaul), where
we always used Shell mineral oil before. I think Philips 20W50 oil was used
for Tiger #2 also, but I'm not sure.
The owner has
- swapped carburetors as already described
- checked carb heat boxes
- isolated primer lines
Any ideas? I'm looking for something that
- mimics a bad accelerator pump but is something else
- didn't start until about 30 hours after engine overhaul
Thanks for your collective wisdom. This one is very frustrating.
|
st" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
| | - The Matronics TeamGrumman-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:
http://www.matronics.com/Navigator?TeamGrumman-List |
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pitts_pilot(at)bellsouth.
Guest
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| Posted: Sun Jan 23, 2011 9:03 am Post subject: Fwd: engine advice needed |
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Well, if YOU do the removing!!! I probably couldn't keep much fuel in the bowl!! LOL
I didn't think it would enough fuel for 20 pumps. Good info. If you get 40 pumps, I guess there might be a problem??
Thanks for the note.
Linn
On 1/23/2011 11:38 AM, FLYaDIVE wrote: [quote]Linn:
An external source for fuel is not needed, there is more than enough fuel in the float bowl and you will have 20 or more pumps before it goes low.
Barry
On Sat, Jan 22, 2011 at 8:51 PM, Linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)> wrote:
| Quote: | I go with the accelerator pump too. Take the carbs off and hook up a temporary fuel source. Exercise the accelerator pump and look at the fuel expended in the throat. I'm guessing you'll find a poor amount of fuel. Take the carbs apart yourselves and clean out the passage from the pump to the throat. I'd also make sure that pump really belongs in that carb ....... should be obvious. I doubt the rebuilders catch either one, making the same mistake each time.
Linn
On 1/22/2011 7:57 PM, GOLDPILOT(at)AOL.COM (GOLDPILOT(at)AOL.COM) wrote: | Quote: |
| Quote: | From: david(at)newlangsyne.com (david(at)newlangsyne.com)
To: goldpilot(at)aol.com (goldpilot(at)aol.com)
Sent: 1/22/2011 5:27:23 A.M. Pacific Standard Time
Subj: engine advice needed
Would you be kind enough to forward this to the Grumman Gang?
The guy who needs the information will be able to see it.
Thanks.
--------------------------------------------------------------
I'm looking for advice about two engines.
Tiger #1: 1979 AA-5B Lyc O-360-A4K (carbureted)
Tiger #2: 1991 AG-5B Lyc O-360-A4K (carbureted)
Each has developed the same problem, about 30 hours after being overhauled.
If the throttle is advanced rapidly, the engine sometimes (not always)
stumbles, almost dies, and THEN responds. Sounds like a problem with the
accelerator pump, doesn't it?
But...
Ops normal for the first several hours after overhaul, which used new
cylinders and included new intake manifolds.
Tiger #1 has had two new (overhauled) carbs since the problem
appeared, same problem.
Tiger #2 has had FOUR carbs since the problem appeared, same problem.
three fresh overhauled
one was the carburetor that was working fine on Tiger #1 just before
its engine went in for overhaul
We (two flying clubs) have been using the same engine shop for at least a
dozen engines over the past 15 years or more. We've followed his recommended
break-in procedures with each engine. The only difference is that he
recommended Phillips 20W50 to break in Tiger #1 (most recent overhaul), where
we always used Shell mineral oil before. I think Philips 20W50 oil was used
for Tiger #2 also, but I'm not sure.
The owner has
- swapped carburetors as already described
- checked carb heat boxes
- isolated primer lines
Any ideas? I'm looking for something that
- mimics a bad accelerator pump but is something else
- didn't start until about 30 hours after engine overhaul
Thanks for your collective wisdom. This one is very frustrating.
|
st" target="_blank">http://www.matronics.com/Navigator?TeamGrumman-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
|
[b]
| | - The Matronics TeamGrumman-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:
http://www.matronics.com/Navigator?TeamGrumman-List |
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teamgrumman(at)yahoo.com
Guest
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| Posted: Sun Jan 23, 2011 9:47 am Post subject: Fwd: engine advice needed |
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I suppose there could be a manifold leak that the carburetor covers up under normal conditions.
From: Linn Walters <pitts_pilot(at)bellsouth.net>
To: teamgrumman-list(at)matronics.com
Sent: Sat, January 22, 2011 5:51:02 PM
Subject: Re: Fwd: engine advice needed
I go with the accelerator pump too. Take the carbs off and hook up a temporary fuel source. Exercise the accelerator pump and look at the fuel expended in the throat. I'm guessing you'll find a poor amount of fuel. Take the carbs apart yourselves and clean out the passage from the pump to the throat. I'd also make sure that pump really belongs in that carb ....... should be obvious. I doubt the rebuilders catch either one, making the same mistake each time.
Linn
On 1/22/2011 7:57 PM, GOLDPILOT(at)AOL.COM (GOLDPILOT(at)AOL.COM) wrote: | Quote: |
| Quote: | From: david(at)newlangsyne.com (david(at)newlangsyne.com)
To: goldpilot(at)aol.com (goldpilot(at)aol.com)
Sent: 1/22/2011 5:27:23 A.M. Pacific Standard Time
Subj: engine advice needed
Would you be kind enough to forward this to the Grumman Gang?
The guy who needs the information will be able to see it.
Thanks.
--------------------------------------------------------------
I'm looking for advice about two engines.
Tiger #1: 1979 AA-5B Lyc O-360-A4K (carbureted)
Tiger #2: 1991 AG-5B Lyc O-360-A4K (carbureted)
Each has developed the same problem, about 30 hours after being overhauled.
If the throttle is advanced rapidly, the engine sometimes (not always)
stumbles, almost dies, and THEN responds. Sounds like a problem with the
accelerator pump, doesn't it?
But...
Ops normal for the first several hours after overhaul, which used new
cylinders and included new intake manifolds.
Tiger #1 has had two new (overhauled) carbs since the problem
appeared, same problem.
Tiger #2 has had FOUR carbs since the problem appeared, same problem.
three fresh overhauled
one was the carburetor that was working fine on Tiger #1 just before
its engine went in for overhaul
We (two flying clubs) have been using the same engine shop for at least a
dozen engines over the past 15 years or more. We've followed his recommended
break-in procedures with each engine. The only difference is that he
recommended Phillips 20W50 to break in Tiger #1 (most recent overhaul), where
we always used Shell mineral oil before. I think Philips 20W50 oil was used
for Tiger #2 also, but I'm not sure.
The owner has
- swapped carburetors as already described
- checked carb heat boxes
- isolated primer lines
Any ideas? I'm looking for something that
- mimics a bad accelerator pump but is something else
- didn't start until about 30 hours after engine overhaul
Thanks for your collective wisdom. This one is very frustrating.
|
|
[quote][b]
| | - The Matronics TeamGrumman-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:
http://www.matronics.com/Navigator?TeamGrumman-List |
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