Today's Message Index:
----------------------
1. 05:42 AM - Voltage fluctuation and EGT temp differential (Weir, Douglas)
2. 09:57 AM - pre purchase inspections (kh)
3. 12:13 PM - Re: pre purchase inspections (flyv35b)
4. 05:17 PM - Re: Voltage fluctuation and EGT temp differential (FLYaDIVE@aol.com)
Message 1
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| Subject: | Voltage fluctuation and EGT temp differential |
--> TeamGrumman-List message posted by: "Weir, Douglas" <Douglas.Weir@clamericas.com>
I just got my plane back from annual from a non-Grumman shop (since it was
there for painting), and have a couple of issues I wanted opinions on:
1) The voltage on my JPI 800 is now fluctuating between about 13.4v and 14v
where previously it was very steady at about 13.8v. Could this indicate a
weak battery? I just got the plane about 8 months ago, and I suspect the
battery is over 2 years old, but there is no logbook entry.
2) The EGT temperature differential at times is near, and even over 200
degrees lower on the #2 cylinder than the highest cylinder (and all the
others are pretty close). Prior to the annual the temperature differential
was usually about 50 degrees, and only occasionally as high as 100 degrees.
Some background: the #2 also had the lowest compression (68), and has at
times fouled (cleared by leaning). Any thoughts on this?
Thanks in advance,
Doug Weir
N414DJ
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Message 2
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| Subject: | pre purchase inspections |
--> TeamGrumman-List message posted by: "kh" <13scrappy@comcast.net>
Does anyone have recommendations on someone for pre purchase inspections in MS
(area code 662) Thanks
kent
Message 3
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| Subject: | Re: pre purchase inspections |
--> TeamGrumman-List message posted by: "flyv35b" <flyv35b@ashcreekwireless.com>
Yeah, Bob Steward in Birmingham, AL
----- Original Message -----
From: "kh" <13scrappy@comcast.net>
Subject: TeamGrumman-List: pre purchase inspections
> --> TeamGrumman-List message posted by: "kh" <13scrappy@comcast.net>
>
> Does anyone have recommendations on someone for pre purchase inspections
in MS (area code 662) Thanks
> kent
>
>
Message 4
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| Subject: | Re: Voltage fluctuation and EGT temp differential |
--> TeamGrumman-List message posted by: FLYaDIVE@aol.com
In a message dated 3/16/04 8:43:49 AM Eastern Standard Time,
Douglas.Weir@clamericas.com writes:
> --> TeamGrumman-List message posted by: "Weir, Douglas" <Douglas.Weir@
> clamericas.com>
>
> I just got my plane back from annual from a non-Grumman shop (since it was
> there for painting), and have a couple of issues I wanted opinions on:
>
> 1) The voltage on my JPI 800 is now fluctuating between about 13.4v and 14v
> where previously it was very steady at about 13.8v. Could this indicate a
> weak battery? I just got the plane about 8 months ago, and I suspect the
> battery is over 2 years old, but there is no logbook entry.
>
> 2) The EGT temperature differential at times is near, and even over 200
> degrees lower on the #2 cylinder than the highest cylinder (and all the
> others are pretty close). Prior to the annual the temperature differential
> was usually about 50 degrees, and only occasionally as high as 100 degrees.
> Some background: the #2 also had the lowest compression (68), and has at
> times fouled (cleared by leaning). Any thoughts on this?
>
> Thanks in advance,
> Doug Weir
> N414DJ
===================
Hi Doug:
Grumman Vs Non Grumman shop does not matter in this case. I have been
contacted by two people in the past week about the exact same problem you are
experiencing in your item #1. Change in voltage readings.
I have traced the problem to one common area:- POOR GROUNDS
Now, what caused the poor grounds? That is harder to trace, explain, or
guess at. I would take a WAG, especially if there was a removal of plane parts,
that paint or corrosion got between a couple of mating parts. Or, when the
plane was reassembled In a Hanger (warm area) and now being flown (colder area)
a
bit of expansion & contraction took place and now you have a resistant
connection.
Simple cure:- Add a few more grounds and clean up the ones you do have now
(Battery +/-, Engine, Alternator, VR, and panel; just to name a few. And of
course check the connections for the JPI.
As for the EGT ... Again that points back to the JPI ... and I hate to say
this, but have you checked the baffling and seals? How are the CHT's? If they
are normal then it could be s simple thing like a bad probe or probe
connection.
Lots of things get moved around during a paint job and even more during an
annual.
Barry
"Chop'd Liver"
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