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jfrjr(at)roadrunner.com
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 Posted: Sat Jan 14, 2012 12:42 pm Post subject: Engine sag |
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Just starting my second "annual" inspection. I have about 3/16" engine sag (240 hours). At initial build I did not allow for the sagging--just built it so the spinner and cowl matched perfectly. I kinda remember the discussions here about correcting the sag but can't find much in the search engine under "engine sag". So do I correct it by shimming (with washers) the lower engine mount to firewall connections? And if that is the correct method how many washers and what thickness would "fix" the 3/16 sag? Thanks, Jay Rowe 40301
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sat Jan 14, 2012 1:20 pm Post subject: Engine sag |
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I am not there yet on my build. On my Mooney with IO-360 Lyc, there are washers on each side of the engine shock mounts. Moving 1 washer from the front of the top mount to the rear of the mount would raise the front of the engine about the right amount. You probably could shim in front of the bottom mounts, but on my Mooney those are twice as hard to get to and work on as the top mounts.
On Sat, Jan 14, 2012 at 1:38 PM, <jfrjr(at)roadrunner.com (jfrjr(at)roadrunner.com)> wrote:
[quote] --> RV10-List message posted by: <jfrjr(at)roadrunner.com (jfrjr(at)roadrunner.com)>
Just starting my second "annual" inspection. I have about 3/16" engine sag (240 hours). At initial build I did not allow for the sagging--just built it so the spinner and cowl matched perfectly. I kinda remember the discussions here about correcting the sag but can't find much in the search engine under "engine sag". So do I correct it by shimming (with washers) the lower engine mount to firewall connections? And if that is the correct method how many washers and what thickness would "fix" the 3/16 sag? Thanks, Jay Rowe 40301
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philperry9
Joined: 23 Nov 2011
Posts: 381
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| Posted: Sat Jan 14, 2012 2:10 pm Post subject: Engine sag |
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What mounts did you use? The Lord mounts?
Sent from my iPhone
On Jan 14, 2012, at 2:38 PM, <jfrjr(at)roadrunner.com> wrote:
| Quote: |
Just starting my second "annual" inspection. I have about 3/16" engine sag (240 hours). At initial build I did not allow for the sagging--just built it so the spinner and cowl matched perfectly. I kinda remember the discussions here about correcting the sag but can't find much in the search engine under "engine sag". So do I correct it by shimming (with washers) the lower engine mount to firewall connections? And if that is the correct method how many washers and what thickness would "fix" the 3/16 sag? Thanks, Jay Rowe 40301
|
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Strasnuts
Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT
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| Posted: Sat Jan 14, 2012 2:43 pm Post subject: Engine sag |
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Speaking of mounts...
I don't want to hijack the thread so I will contribute first.
I originally set my cowling to accept 1/8" sag over time. My engine has 150
hours on it and my engine is sagged down flush to the spinner. It might sag
more over time but for now it's working out.
I have the IO-540-N1A5 engine which has a heavier crank and 5th and 6th
dampers. It weighs in at 428lbs vs the 412lb D4A5 engine. I remember
someone else asking me about this engine choice and wanted to share my
experience.
When I shopped around for engine mounts I couldn't find any j3804-30's which
are made for the N1A5. The engine builder and Lord both recommended
the -28's which are used on the D4A5's. I bought these especially since
Lord doesn't make the -30's anymore.
After flying in my plane and flying other tens I could tell my engine had a
different lower vibration than the other tens. I didn't like it being
different so I went out to Boise and had my prop dynamically balanced at
Precision Prop. The vibration didn't change much. So now it is annual time
on my plane and I wanted to get to the bottom of it. I called Lord again
and explaned the scenario and history. This time I spoke to an engineer who
talked me into buying two J-6545-1 mounts and interchanging some sandwich
parts with the J3804-28's. Also swapping out two of the gel spacers for two
solid spacers and mounting them diagonally from each other. It all sounds
like voodoo to me but the guy sounded like he new what he was saying. I'll
let you know how it comes out if anyone cares or if anyone has this same
engine.
On another note I just found out the easiest way to test your new 406
ELT....I don't recommend this BTW!
I put the remote faceplate on backwards so the test/reset button was
actually the ELT "on" button. Luckily I registered the ELT online
yesterday.
Got a call from the Air Force about 5 minutes after testing the ELT.
OOOOOOPS! I feel really stupid. It would save the trouble of making the
test circuit but not recommened.
---
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40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours |
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jfrjr(at)roadrunner.com
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| Posted: Sat Jan 14, 2012 2:44 pm Post subject: Engine sag |
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Phil: I used the Van's supplied mounts which I believe are made by "Barry Contols". Jay
---- Phil Perry <philperry9(at)gmail.com> wrote:
| Quote: |
What mounts did you use? The Lord mounts?
Sent from my iPhone
On Jan 14, 2012, at 2:38 PM, <jfrjr(at)roadrunner.com> wrote:
>
>
> Just starting my second "annual" inspection. I have about 3/16" engine sag (240 hours). At initial build I did not allow for the sagging--just built it so the spinner and cowl matched perfectly. I kinda remember the discussions here about correcting the sag but can't find much in the search engine under "engine sag". So do I correct it by shimming (with washers) the lower engine mount to firewall connections? And if that is the correct method how many washers and what thickness would "fix" the 3/16 sag? Thanks, Jay Rowe 40301
>
>
>
>
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