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Torque

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BobbyPaulk(at)COMCAST.NET
Guest

Posted: Sat Jul 04, 2009 7:52 am Post subject: Torque

All,

i have just re-torqued my head bolts ( 84 hrs TT on 3300A )  to 20 Ft./Lbs as instructed and found 3 cylinder bolts at the 6 o'clock position just a hair loose. it took less than an inch of rotation to click the torque wrench. 

i was wondering if anyone else was experiencing this situation. also the bolt just above it on the exhaust side of 2 cylinders did the same thing.  i have all cylinders at cruise CHT's under 300 deg. except No. 2 and it runs about 310. (working on it )



thanks for any info,



Bobby

N131BP

601 XL

 [quote][b]

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imap8ntr(at)cox.net
Guest

Posted: Sat Jul 04, 2009 9:03 am Post subject: Torque

Bobby,

 According to the Jabiru USA  website the maintenance torque of the head bolts is 22  ft-lbs.

 Ivan

  

 [quote]   ---

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Sat Jul 04, 2009 1:55 pm Post subject: Re: Torque

20 ft lbs is correct it was revised a few years back and is in the current maintenance manual, although 22 is close enough.



In practice, on my engine some bolts move and some dont. The hex head ones exhibit less stiction whereas the capscrews often need a sharp pulse to break the setting. Jabiru instructions are NOT to back any bolts off to reset torque, therefore its a personal judgement as to how far you want to bump the torque over 20 ft lbs to be able to move the bolts to the correct setting.  The lowest capscrew which is accessed via the NPT plug is the one that needs the most attention, so dont miss that one.



Your results at 84 hrs seem normal enough. You only do this operation 50 hourly.



Ralph (at) 300hrs

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_________________
Ralph - CH701 / 2200a

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Sat Jul 04, 2009 2:51 pm Post subject: Torque

Not a 3300, but my 2200 exhibits the same 6 o'clock position lower  

torque readings.

(I wonder when the term "xx o'clock position" will fade from memory  

as the new generation of kids brought up on digital time won't know  

what that means)



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 691.6 hrs

Sensenich 62"x46" Wood prop

Electroair direct-fire ignition system

Status: flying





On Jul 4, 2009, at 11:48 AM, BobbyPaulk(at)comcast.net wrote:



 	  Quote: 	
		   All,

 i have just re-torqued my head bolts ( 84 hrs TT on 3300A )  to 20  

 Ft./Lbs as instructed and found 3 cylinder bolts at the 6 o'clock  

 position just a hair loose. it took less than an inch of rotation  

 to click the torque wrench.

 i was wondering if anyone else was experiencing this situation.  

 also the bolt just above it on the exhaust side of 2 cylinders did  

 the same thing.  i have all cylinders at cruise CHT's under 300  

 deg. except No. 2 and it runs about 310. (working on it )



 thanks for any info,



 Bobby

 N131BP

 601 XL

 ============================================================ _- 

 ============================================================ _- 

 contribution_- 

 ============================================================

- The Matronics JabiruEngine-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?JabiruEngine-List

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

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