Today's Message Index:
----------------------
1. 08:41 AM - Re: Fw: engine advice needed (FLYaDIVE)
2. 09:03 AM - Re: Fw: engine advice needed (Linn Walters)
3. 09:47 AM - Re: Fw: engine advice needed (Gary Vogt)
4. 01:46 PM - Re: Fw: engine advice needed (FLYaDIVE)
Message 1
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| Subject: | Re: Fwd: engine advice needed |
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@bellsouth.net>wrote:
> 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@AOL.COM wrote:
>
>
> ------------------------------
> From: david@newlangsyne.com
> To: goldpilot@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.
>
> *
>
> *
>
>
> *
>
>
> *
>
>
Message 2
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| Subject: | Re: Fwd: engine advice needed |
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:
> 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@bellsouth.net <mailto:pitts_pilot@bellsouth.net>> wrote:
>
> 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@AOL.COM <mailto:GOLDPILOT@AOL.COM>
> wrote:
>>
>> ------------------------------------------------------------------------
>> From: david@newlangsyne.com <mailto:david@newlangsyne.com>
>> To: goldpilot@aol.com <mailto:goldpilot@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 *
>
>
> *
>
>
> *
Message 3
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| Subject: | Re: Fwd: engine advice needed |
I suppose there could be a manifold leak that the carburetor covers up under
normal conditions.
________________________________
From: Linn Walters <pitts_pilot@bellsouth.net>
Sent: Sat, January 22, 2011 5:51:02 PM
Subject: Re: TeamGrumman-List: 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@AOL.COM wrote:
>
>
________________________________
From: david@newlangsyne.com
>>To: goldpilot@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.
>>
Message 4
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| Subject: | Re: Fwd: engine advice needed |
Linn:
I was very much surprised on how much fuel was still in the bowl after it
was removed and sat for about 2 to 3 months.
Pumping the throttle arm produced a squirt of fuel about 5 inches long out
of the spray nozzle.
I did the pumping because I was going to ship the engine out for a major.
Barry
On Sun, Jan 23, 2011 at 11:53 AM, Linn Walters <pitts_pilot@bellsouth.net>wrote:
> 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:
>
> 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@bellsouth.net>wrote:
>
>> 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@AOL.COM wrote:
>>
>>
>>
>>
>> ------------------------------
>> From: david@newlangsyne.com
>> To: goldpilot@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
>> *
>>
>>
> *
>
> *
>
>
> *
>
> *
>
>
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