Today's Message Index:
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1. 12:31 PM - Tightening head bolts on Jab 2200, which method is best? (Frankd)
2. 03:07 PM - Re: Tightening head bolts on Jab 2200, which method is best? (Tim Yoder)
3. 07:36 PM - Re: Tightening head bolts on Jab 2200, which method is best? (Mark Hubelbank)
Message 1
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| Subject: | Tightening head bolts on Jab 2200, which method is |
best?
Hello,
I have a 2200 on a KOLB that I need to do the annual on and one item required is
to tighten the head bolts to 24foot-Lbs.
Do I unscrew the bolts a little first and then re-tighten to the correct torque
or do I just tighten from their current position.
I have received answers that recommend both!! from different people.
My gut tells me that the correct method is to loosen the bolt first and then tighten
to the spec, that way you don't fight the built in friction.
Also, it says use anti-seize on these bolts, and if I loosen should I put some
anti-seize on them as well?
Thanks for your advise
FrankD
Kolb MkIII Xtra.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=429132#429132
Message 2
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| Subject: | Tightening head bolts on Jab 2200, which method |
is best?
Frank,
Assuming that the head bolts were originally assembled with
anti-corrision/anit-seize compound and torque to 24 ft. lbs., you re-torque
to 20 ft. lbs. to see if there has been cylinder head over heating. Do not
back off the bolt first or you negate the test. If they move, look at your
cooling ducts and flight profile for reducing max CHT's. The bolts should
not move on this check.
This procedure is different, for example, than re-torque of wood props where
you do loosen the bolt a little prior to re-torque. These bolts are
assembled dry and you loosen them to relieve any binding from corrosion,
etc.
Hope this helps.
Tim
-----Original Message-----
From: owner-jabiruengine-list-server@matronics.com
[mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Frankd
Sent: Friday, August 22, 2014 12:31 PM
Subject: JabiruEngine-List: Tightening head bolts on Jab 2200, which method
is best?
Hello,
I have a 2200 on a KOLB that I need to do the annual on and one item
required is to tighten the head bolts to 24foot-Lbs.
Do I unscrew the bolts a little first and then re-tighten to the correct
torque or do I just tighten from their current position.
I have received answers that recommend both!! from different people.
My gut tells me that the correct method is to loosen the bolt first and then
tighten to the spec, that way you don't fight the built in friction.
Also, it says use anti-seize on these bolts, and if I loosen should I put
some anti-seize on them as well?
Thanks for your advise
FrankD
Kolb MkIII Xtra.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=429132#429132
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Message 3
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| Subject: | Re: Tightening head bolts on Jab 2200, which method |
is best?
You might also note that a lot of Jabiru engines will have some
head bolts keep moving for up to the first 100 hours. That was my
observation. I carefully monitored CHTs and do believe they were kept
within limits at all times.
The biggest change was as one would expect in the first few hours
but It didn't completely stabilize for a while. Quite different from
automotive heads. And generally other aircraft engines don't have head
bolts.
--
Mark Hubelbank
mhubel@nemon.com
978-443-3955
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