Today's Message Index:
----------------------
1. 07:15 AM - Re: JabiruEngine-List Digest: 8 Msgs - 09/12/11 (BobbyPaulk@comcast.net)
2. 10:34 AM - Re: JabiruEngine-List Digest: 8 Msgs - 09/12/11 (Norman Cowell)
Message 1
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| Subject: | Re: JabiruEngine-List Digest: 8 Msgs - 09/12/11 |
List,
Thanks to all that responded to my Compression concerns.
I will run the engine and do it again hot. I did however pump the prop blade near
TDC to help seat the rings which only added about one pound if that. Since
it passed cold I have no problem flying it but I will do it again hot to see the
results. I will post the results.
Thanks again
bobby
601 XL
Jab 3300
125 hrs
DO NOT ARCHIVE
Message 2
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| Subject: | Re: JabiruEngine-List Digest: 8 Msgs - 09/12/11 |
just to let you know Norman passed away 3.08.11. Would be much obliged if
you would cancell these messages.
Thank you
Mrs. P. Cowell
----- Original Message -----
From: "JabiruEngine-List Digest Server" <jabiruengine-list@matronics.com>
Sent: Tuesday, September 13, 2011 7:59 AM
Subject: JabiruEngine-List Digest: 8 Msgs - 09/12/11
> *
>
> =================================================
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>
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>
> HTML Version:
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> ===============================================
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> ----------------------------------------------------------
> JabiruEngine-List Digest Archive
> ---
> Total Messages Posted Mon 09/12/11: 8
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 07:36 AM - Compression (BobbyPaulk@comcast.net)
> 2. 07:49 AM - Re: Compression (Martin Hone)
> 3. 08:33 AM - Re: Compression (Garth Knowles)
> 4. 10:14 AM - Re: Compression (FLYaDIVE)
> 5. 11:12 AM - Re: Compression (Pete Krotje)
> 6. 02:08 PM - Re: Compression (Gary Aman)
> 7. 03:15 PM - Re: Compression (BobsV35B@aol.com)
> 8. 03:22 PM - Re: Compression (BobsV35B@aol.com)
>
>
> ________________________________ Message 1
> _____________________________________
>
>
> Time: 07:36:23 AM PST US
> From: BobbyPaulk@comcast.net
> Subject: JabiruEngine-List: Compression
>
>
> List,
> I just finished a differential compression check of my 3300 for it's
> Conditional
> Inspection.
> It has 125 hrs and has been broken in correctly and oil changed regularly.
> 3 cylinders have dropped to the low 60's over 80. #3, 4 & 5 are down from
> the mid
> 70's. #3 was below 70 at last conditional but now I have two more
> following
> suit. The #3 & 4 are not the hottest cylinders but #5 is second hottest.
> Engine
> was cold for 2 days at time of check. At this rate I don't know if it will
> make Top OH.
> The compression is being lost through the rings as it can be heard thru
> the oil
> dipstick tube. Has anyone had a similar problem and is there any thing I
> can
> do about it. I am going to add Marvel Mystery to the fuel but I think that
> would
> be just a band aid on a more serious problem. How low should the
> compression
> get before I get alarmed??
>
> Bobby Paulk
> 601 XL N131BP
> Jabiru 3300 S/N 1141
>
>
> ________________________________ Message 2
> _____________________________________
>
>
> Time: 07:49:02 AM PST US
> Subject: Re: JabiruEngine-List: Compression
> From: Martin Hone <aerobiz1@gmail.com>
>
> Hi Bobby,
>
> This sounds all too familiar. From memory, my Jab manual says that you
> need
> to pull the cylinders if the reading is 60/80 or less, but I would
> strongly
> suggest doing the test again but on a warm engine before getting too
> excited.
>
> Cheers
>
> Martin
>
> On Tue, Sep 13, 2011 at 12:31 AM, <BobbyPaulk@comcast.net> wrote:
>
>>
>>
>> List,
>> I just finished a differential compression check of my 3300 for it's
>> Conditional Inspection.
>> It has 125 hrs and has been broken in correctly and oil changed
>> regularly.
>> 3 cylinders have dropped to the low 60's over 80. #3, 4 & 5 are down from
>> the mid 70's. #3 was below 70 at last conditional but now I have two more
>> following suit. The #3 & 4 are not the hottest cylinders but #5 is
>> second
>> hottest. Engine was cold for 2 days at time of check. At this rate I
>> don't
>> know if it will make Top OH.
>> The compression is being lost through the rings as it can be heard thru
>> the oil dipstick tube. Has anyone had a similar problem and is there any
>> thing I can do about it. I am going to add Marvel Mystery to the fuel but
>> I
>> think that would be just a band aid on a more serious problem. How low
>> should the compression get before I get alarmed??
>>
>> Bobby Paulk
>> 601 XL N131BP
>> Jabiru 3300 S/N 1141
>>
>>
>> *
>>
>> *
>>
>>
>
> ________________________________ Message 3
> _____________________________________
>
>
> Time: 08:33:34 AM PST US
> From: Garth Knowles <garthknowles@yahoo.com>
> Subject: Re: JabiruEngine-List: Compression
>
>>From my experience, when doing both leakdown and compression checks,
>>engine
> temperature can make a significant difference.- Jabiru says "warm to hot
> " for a leakdown test where the max 25% drop would apply.- You may not ha
> ve an issue at all.=0A=0A=0AGarth=0A=0AFrom: "BobbyPaulk@comcast.net"
> <Bobb
> yPaulk@comcast.net>=0A>To: jabiruengine-list-digest@matronics.com=0A>Sent:
> Monday, September 12, 2011 10:31:19 AM=0A>Subject: JabiruEngine-List:
> Compr
> ession=0A>=0A>=0A>=0A>=0A>List,=0A>I just finished a differential
> compressi
> on check of my 3300 for it's Conditional Inspection.=0A>It has 125 hrs and
> has been broken in correctly and oil changed regularly. =0A>3 cylinders
> hav
> e dropped to the low 60's over 80. #3, 4 & 5 are down from the mid 70's.
> #3
> was below 70 at last conditional but now I have two more following suit. T
> he #3 & 4- are not the hottest cylinders but #5 is second hottest. Engine
> was cold for 2 days at time of check. At this rate I don't know if it will
> make Top OH.=0A>The compression is being- lost through the rings as it c
> an be heard thru the oil dipstick tube. Has anyone had a similar problem
> an
> d is there any thing I can do about it. I am going to add Marvel Mystery
> to
> the fuel but I think that would be just a band aid on a more serious probl
> em. How low should the compression get before I get alarmed??=0A>=0A>Bobby
> ============== =0A>=0A>
>
> ________________________________ Message 4
> _____________________________________
>
>
> Time: 10:14:30 AM PST US
> Subject: Re: JabiruEngine-List: Compression
> From: FLYaDIVE <flyadive@gmail.com>
>
> Bobby:
>
> MMO - Not to the fuel, but in to the CYLINDER. Remove the plug, squirt
> MMO
> all over the inside of the cylinder (about 1 oz per cylinder) and let it
> sit
> over night. If luck is on your side you may just free up some sticky
> rings.
> If you want to add some MMO to the oil - - - ONE HOUR BEFORE AN OIL
> CHANGE.
> DO NOT RUN WITH MMO MORE THAN THAT.
> You will see a cleaning of all internal parts.
> MMO in the fuel is pretty much wasted. The ratio of fuel is so high and
> the
> flow rate so fast that it really does nothing. Been there - Done that.
>
> Barry
>
>
> On Mon, Sep 12, 2011 at 10:31 AM, <BobbyPaulk@comcast.net> wrote:
>
>>
>>
>> List,
>> I just finished a differential compression check of my 3300 for it's
>> Conditional Inspection.
>> It has 125 hrs and has been broken in correctly and oil changed
>> regularly.
>> 3 cylinders have dropped to the low 60's over 80. #3, 4 & 5 are down from
>> the mid 70's. #3 was below 70 at last conditional but now I have two more
>> following suit. The #3 & 4 are not the hottest cylinders but #5 is
>> second
>> hottest. Engine was cold for 2 days at time of check. At this rate I
>> don't
>> know if it will make Top OH.
>> The compression is being lost through the rings as it can be heard thru
>> the oil dipstick tube. Has anyone had a similar problem and is there any
>> thing I can do about it. I am going to add Marvel Mystery to the fuel but
>> I
>> think that would be just a band aid on a more serious problem. How low
>> should the compression get before I get alarmed??
>>
>> Bobby Paulk
>> 601 XL N131BP
>> Jabiru 3300 S/N 1141
>>
>>
>> *
>>
>> *
>>
>>
>
> ________________________________ Message 5
> _____________________________________
>
>
> Time: 11:12:01 AM PST US
> From: "Pete Krotje" <pete@usjabiru.com>
> Subject: RE: JabiruEngine-List: Compression
>
> Bobby,
>
>
> Before you start adding mysterious additives please do what the manual
> says
> and warm up your engine thoroughly before the compression check. The
> engine
> should be as hot as practical to work with. We can take any engine cold
> and
> get very inconsistent compression results!
>
>
> Pete Krotje
>
> Jabiru USA Sport Aircraft, LLC
>
> 931-680-2800
>
> www.usjabiru.com
>
>
> From: owner-jabiruengine-list-server@matronics.com
> [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of
> FLYaDIVE
> Sent: Monday, September 12, 2011 12:12 PM
> Subject: Re: JabiruEngine-List: Compression
>
>
> Bobby:
>
>
> MMO - Not to the fuel, but in to the CYLINDER. Remove the plug, squirt
> MMO
> all over the inside of the cylinder (about 1 oz per cylinder) and let it
> sit
> over night. If luck is on your side you may just free up some sticky
> rings.
>
> If you want to add some MMO to the oil - - - ONE HOUR BEFORE AN OIL
> CHANGE.
> DO NOT RUN WITH MMO MORE THAN THAT.
>
> You will see a cleaning of all internal parts.
>
> MMO in the fuel is pretty much wasted. The ratio of fuel is so high and
> the
> flow rate so fast that it really does nothing. Been there - Done that.
>
>
> Barry
>
>
> On Mon, Sep 12, 2011 at 10:31 AM, <BobbyPaulk@comcast.net> wrote:
>
>
> List,
> I just finished a differential compression check of my 3300 for it's
> Conditional Inspection.
> It has 125 hrs and has been broken in correctly and oil changed regularly.
> 3 cylinders have dropped to the low 60's over 80. #3, 4 & 5 are down from
> the mid 70's. #3 was below 70 at last conditional but now I have two more
> following suit. The #3 & 4 are not the hottest cylinders but #5 is second
> hottest. Engine was cold for 2 days at time of check. At this rate I don't
> know if it will make Top OH.
> The compression is being lost through the rings as it can be heard thru
> the
> oil dipstick tube. Has anyone had a similar problem and is there any thing
> I
> can do about it. I am going to add Marvel Mystery to the fuel but I think
> that would be just a band aid on a more serious problem. How low should
> the
> compression get before I get alarmed??
>
> Bobby Paulk
> 601 XL N131BP
> Jabiru 3300 S/N 1141
>
>
> ist" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
> tp://forums.matronics.com
> _blank">http://www.matronics.com/contribution
>
>
> ________________________________ Message 6
> _____________________________________
>
>
> Time: 02:08:01 PM PST US
> Subject: Re: JabiruEngine-List: Compression
> From: Gary Aman <zeprep251@aol.com>
>
> Bobby,
> Sometimes you can get the pressures up by slowly taking the piston over
> top
> center a few degrees and then bringing it back up to tdc WHILE HOLDING THE
> PROP FIRMLY THROUGH THIS MOTION!! It made a big difference on my Continent
> al O200;s and IO470's
> G.Aman
>
>
> -----Original Message-----
> From: BobbyPaulk <BobbyPaulk@comcast.net>
> Sent: Mon, Sep 12, 2011 11:11 am
> Subject: JabiruEngine-List: Compression
>
>
> List,
> I just finished a differential compression check of my 3300 for it's
> Condit
> ional Inspection.
> It has 125 hrs and has been broken in correctly and oil changed regularly.
>
> 3 cylinders have dropped to the low 60's over 80. #3, 4 & 5 are down from
> t
> he mid 70's. #3 was below 70 at last conditional but now I have two more
> fo
> llowing suit. The #3 & 4 are not the hottest cylinders but #5 is second
> ho
> ttest. Engine was cold for 2 days at time of check. At this rate I don't
> kn
> ow if it will make Top OH.
> The compression is being lost through the rings as it can be heard thru
> th
> e oil dipstick tube. Has anyone had a similar problem and is there any
> thin
> g I can do about it. I am going to add Marvel Mystery to the fuel but I
> thi
> nk that would be just a band aid on a more serious problem. How low should
> the compression get before I get alarmed??
>
> Bobby Paulk
> 601 XL N131BP
> Jabiru 3300 S/N 1141
>
>
> ________________________________ Message 7
> _____________________________________
>
>
> Time: 03:15:31 PM PST US
> From: BobsV35B@aol.com
> Subject: Re: JabiruEngine-List: Compression
>
> Good Afternoon Bobby,
>
> The Comparative Compression Check has been proven to have many faults. So
> many such that Continental Motors now recommends that when the Compression
> gets below the ancient 75 percent rule, further investigation be used
> before
> a cylinder is pulled.
>
> They specify that the valves be looked at via a Borescope. If the coloring
> is equal all the way around. The valves are not being "burned" and can
> remain in service.
>
> In your case where you feel there is a ring problem, They recommend that
> oil consumption be monitored. As long as such consumption is normal
> (Whatever that is?) the engine is OK.
>
> CMC recommends that no cylinder be removed on strictly a low compression
> number.
>
> See Continental Service Bulletin SB03-3.
>
> My take is that the same principles will apply to the Jabiru.
>
> Happy Skies,
>
> Old Bob
> Stearman N3977A
> Downers Grove, IL
> LL22
>
>
> In a message dated 9/12/2011 4:08:23 P.M. Central Daylight Time,
> zeprep251@aol.com writes:
>
> Bobby,
> Sometimes you can get the pressures up by slowly taking the piston over
> top center a few degrees and then bringing it back up to tdc WHILE
> HOLDING
> THE PROP FIRMLY THROUGH THIS MOTION!! It made a big difference on my
> Continental O200;s and IO470's
> G.Aman
>
>
> -----Original Message-----
> From: BobbyPaulk <BobbyPaulk@comcast.net>
> Sent: Mon, Sep 12, 2011 11:11 am
> Subject: JabiruEngine-List: Compression
>
>
> List,
> I just finished a differential compression check of my 3300 for it's
> Conditional Inspection.
> It has 125 hrs and has been broken in correctly and oil changed
> regularly.
> 3 cylinders have dropped to the low 60's over 80. #3, 4 & 5 are down from
> the mid 70's. #3 was below 70 at last conditional but now I have two more
> following suit. The #3 & 4 are not the hottest cylinders but #5 is
> second
> hottest. Engine was cold for 2 days at time of check. At this rate I
> don't
> know if it will make Top OH.
> The compression is being lost through the rings as it can be heard thru
> the oil dipstick tube. Has anyone had a similar problem and is there any
> thing I can do about it. I am going to add Marvel Mystery to the fuel but
> I
> think that would be just a band aid on a more serious problem. How low
> should
>
> the compression get before I get alarmed??
>
> Bobby Paulk
> 601 XL N131BP
> Jabiru 3300 S/N 1141
>
>
> ________________________________ Message 8
> _____________________________________
>
>
> Time: 03:22:59 PM PST US
> From: BobsV35B@aol.com
> Subject: Re: JabiruEngine-List: Compression
>
> HMMM---
>
> One more thing Bobby,
>
> I should have mentioned that the Borescope inspection should include
> looking at the cylinder wall to check for scratches which may indicate a
> broken
>
> ring.
>
> Happy Skies.
>
> Old Bob
> AKA
> Bob Siegfried
> Ancient Aviator
>
>
> In a message dated 9/12/2011 5:15:55 P.M. Central Daylight Time,
> BobsV35B@aol.com writes:
>
> Good Afternoon Bobby,
>
> The Comparative Compression Check has been proven to have many faults. So
> many such that Continental Motors now recommends that when the Compression
> gets below the ancient 75 percent rule, further investigation be used
> before
> a cylinder is pulled.
>
> They specify that the valves be looked at via a Borescope. If the
> coloring
> is equal all the way around. The valves are not being "burned" and can
> remain in service.
>
> In your case where you feel there is a ring problem, They recommend that
> oil consumption be monitored. As long as such consumption is normal
> (Whatever that is?) the engine is OK.
>
> CMC recommends that no cylinder be removed on strictly a low compression
> number.
>
> See Continental Service Bulletin SB03-3.
>
> My take is that the same principles will apply to the Jabiru.
>
> Happy Skies,
>
> Old Bob
> Stearman N3977A
> Downers Grove, IL
> LL22
>
>
> In a message dated 9/12/2011 4:08:23 P.M. Central Daylight Time,
> zeprep251@aol.com writes:
>
> Bobby,
> Sometimes you can get the pressures up by slowly taking the piston over
> top center a few degrees and then bringing it back up to tdc WHILE
> HOLDING
> THE PROP FIRMLY THROUGH THIS MOTION!! It made a big difference on my
> Continental O200;s and IO470's
> G.Aman
>
>
> -----Original Message-----
> From: BobbyPaulk <BobbyPaulk@comcast.net>
> Sent: Mon, Sep 12, 2011 11:11 am
> Subject: JabiruEngine-List: Compression
>
>
> List,
> I just finished a differential compression check of my 3300 for it's
> Conditional Inspection.
> It has 125 hrs and has been broken in correctly and oil changed
> regularly.
> 3 cylinders have dropped to the low 60's over 80. #3, 4 & 5 are down from
> the mid 70's. #3 was below 70 at last conditional but now I have two more
> following suit. The #3 & 4 are not the hottest cylinders but #5 is
> second
> hottest. Engine was cold for 2 days at time of check. At this rate I
> don't
> know if it will make Top OH.
> The compression is being lost through the rings as it can be heard thru
> the oil dipstick tube. Has anyone had a similar problem and is there any
> thing I can do about it. I am going to add Marvel Mystery to the fuel but
> I
> think that would be just a band aid on a more serious problem. How low
> should
>
> the compression get before I get alarmed??
>
> Bobby Paulk
> 601 XL N131BP
> Jabiru 3300 S/N 1141
>
>
>
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