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Adjusting screw torque
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4aplat

Joined: 12 Oct 2010
Posts: 9

Posted: Tue Oct 12, 2010 8:40 am Post subject: Adjusting screw torque

Hi 



For my #570 2200 Jab engine I'm looking for the torque I'm supposed to apply on the adjusting screw



I'm not able to found it in the "J2200 Engine Maintenance Solid Valve Lifter Models Manual"



thanks in advance



MicheL

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Tue Oct 12, 2010 9:43 am Post subject: Adjusting screw torque

Michel, what adjusting screw do you refer to?

A screw on what?



Regards, clive 



--

4aplat

Joined: 12 Oct 2010
Posts: 9

Posted: Tue Oct 12, 2010 10:37 am Post subject: Re: Adjusting screw torque

Hi Clive



I'm speaking about the screw on the Rocker Arm.



Itorked the head at 24 ft.lbs but the screw broke (see the picture)



MicheL



 	  Clive J wrote: 	
		  Michel, what adjusting screw do you refer to?

A screw on what?



Regards, clive 



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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Tue Oct 12, 2010 11:49 pm Post subject: Adjusting screw torque

Hello again Michel.



I'm afraid the picture didn't come through, send it direct to my E mail

address.

I don't think there is a torque number for the adjusting screw locknut.

I have heard of these breaking and usually it is because the locknut is

done up too tight.

People are worried the locknut will come loose but in practice if the

locknut is tightened up just by feel this is sufficient. Certainly

nothing like 24 ft/lbs. more like 8. Next time I have the covers off

I'll try it with a torque wrench.

A lot more force is needed to undo the lock nut than do go it up. Try

locking and unlocking a few times with a light force. If the adjusting

screw is the type that takes a hexagon wrench this weakens it so it is

nothing like a normal set screw. Later ones have changed to a solid

screw I think.



There is too much messing about with tappet adjusting. In reality with a

metal to metal head to barrel joint the tappet clearance will not

change. On the very old engines when you pull up a head bolt you are

often twisting the head (even at the right torque as the ally was poor).

Cleaning out the bolt holes so it's a true torque to the bolt is

important. The twist of the head caused locking onto the bolt shank. If

you feel this the bolt hole will need clearing out. An ordinary drill

will do it though there used to be talk of 'reaming' I drilled mine and

they were fine.



I set to 12 thou clearance and providing next time I still have more

than 10 and I can get a 12 feeler gauge 'in' I don't mess with adjusting

the tappet. 



In time there is wear in the tappet face and bush and this will need

adjusting out but that is after many hours. That is when with a 12 thou

feeler in the gap you can rattle the tappet.



Regards, Clive



--

4aplat

Joined: 12 Oct 2010
Posts: 9

Posted: Tue Oct 12, 2010 11:56 pm Post subject: Re: Adjusting screw torque

HI clive

thank's for the answer



here are the pictures (just copy and glue in your browser)



I don't have your email !



http://jabiru-owner.com/images/pdf/vis01.jpg



http://jabiru-owner.com/images/pdf/vis02.jpg



I found the torke value in this document :



http://www.jabirupacific.com/pdf/HeadTorqueValveSetting.pdf



MicheL

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matronics(at)rtist.nl
Guest

Posted: Wed Oct 13, 2010 12:17 am Post subject: Adjusting screw torque

Ouch... Please read the head torque document over once more. Each time it 

mentions 24ft/lb it only refers to the 6 cylinder head bolts.



Rob



---

4aplat

Joined: 12 Oct 2010
Posts: 9

Posted: Wed Oct 13, 2010 12:31 am Post subject: Re: Adjusting screw torque

reading  	  Quote: 	
		  Adjust the tappets when the engine is 

cold. Head torqued to 24 ft lb. when cold. Carry out this adjustment after five hours of 

operation and again after ten hours of operation. At the 25 hour inspection this is done 

again. 	




I supposed 24ftlb was the torque for the nut (as it is int the "tapped adjustment" paragraph



MicheL (not very good in english)



 	  matronics(at)rtist.nl wrote: 	
		  Ouch... Please read the head torque document over once more. Each time it 

mentions 24ft/lb it only refers to the 6 cylinder head bolts.



Rob



---

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Lynn Matteson

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

Posted: Wed Oct 13, 2010 2:23 am Post subject: Adjusting screw torque

Clive, I just figured he was talking about the valve adjusting screw,  

but I thought he or someone else would clarify this. I don't know the  

torque setting for that screw/jam nut, as I have always just snugged  

them up and then added a "bit for good measure"....this is a case  

where us old mechanics had this "torque figure" written into our  

DNA. : )



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062

Sensenich 62"x46" Wood (summer)

Electroair direct-fire ignition system

Rotec TBI-40 injection

Status: flying...1054 hrs (since 3-27-2006)



On Oct 12, 2010, at 1:40 PM, James, Clive R wrote:



[quote] 

 <clive.james(at)uk.bp.com>



 Michel, what adjusting screw do you refer to?

 A screw on what?



 Regards, clive



 --

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Lynn
Kitfox IV-Jabiru 2200
N369LM

Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Wed Oct 13, 2010 8:14 am Post subject: Adjusting screw torque

Indeed the wording is not good.



Need to be careful with 24 ft/lbs, this doesn't apply to all engines. I

believe it's 18, 20 and 24 depending on which engine you have (I maybe

wrong about the 18, I only have a 2000 and a 2003 manual here).



Regards, Clive



--

Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Wed Oct 13, 2010 8:25 am Post subject: Adjusting screw torque

'nip it up, and a bit'



I do know of a plane that ended up upside down in a field, one of the

tappet adjusters worked loose and the valve stopped opening. Power

dropped off, 2 POB, couldn't maintain altitude, long crop. Bingo. 

I always assumed the nut must have been missed rather than not done up

enough but we'll never know....



--

4aplat

Joined: 12 Oct 2010
Posts: 9

Posted: Wed Oct 13, 2010 9:27 am Post subject: Re: Adjusting screw torque

Hi Clive



Is it possible to know where it's possible to find 18 (20 or 24) in the manual ?



thanks in advance



MIcheL



 	  Clive J wrote: 	
		  Indeed the wording is not good.



Need to be careful with 24 ft/lbs, this doesn't apply to all engines. I

believe it's 18, 20 and 24 depending on which engine you have (I maybe

wrong about the 18, I only have a 2000 and a 2003 manual here).



Regards, Clive



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plus2s

Joined: 30 Nov 2006
Posts: 65
Location: NEW ZEALAND

Posted: Wed Oct 13, 2010 11:46 am Post subject: Adjusting screw torque

From memory 24 ft/lb is the assembly torque - rechecks are at 20 ft/lb for head studs

  

 Rgds

 Keith



--- On Thu, 14/10/10, 4aplat <ulm(at)ascenseur-parisien.com> wrote:



  	  Quote: 	
		  

From: 4aplat <ulm(at)ascenseur-parisien.com>

Subject: Re: Adjusting screw torque

To: jabiruengine-list(at)matronics.com

Date: Thursday, 14, October, 2010, 6:27 AM



 --> JabiruEngine-List message posted by: "4aplat" <ulm(at)ascenseur-parisien.com (ulm(at)ascenseur-parisien.com)>



Hi Clive



Is it possible to know where it's possible to find 18 (20 or 24) in the manual ?



thanks in advance



MIcheL

Clive J wrote:

 	  Quote: 	
		   Indeed the wording is not good.

 

 Need to be careful with 24 ft/lbs, this doesn't apply to all engines. I

 believe it's 18, 20 and 24 depending on which engine you have (I maybe

 wrong about the 18, I only have a 2000 and a 2003 manual here).

 

 Regards, Clive

 

 --


	




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http://jabiru-owner.com





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=315595#315595http://www.matronics.com/Nanbsp;                   -Matt matronics.com/contribution" target=_blank>http://www.matronics.com/contri================





	
  [quote][b]

Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Wed Oct 13, 2010 12:02 pm Post subject: Adjusting screw torque

Section 5.3 'Initial after 25 hours checks'

in all the manuals I have here. 



I recall lately there is two torques, one for building the engine and

one for checking afterwards. 

The setting in 5.3 is the one to check for.



What is your serial number of the engine and what engine? 2200/3300?



Regards, Clive

 



--

Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Wed Oct 13, 2010 12:13 pm Post subject: Adjusting screw torque

So from the manual below, if you can see the 'zapgrab' picture  generally it's 20-22ft lbs 

This is from section 7. This is manual has been updated from the  one I got with my engine, I only have that on paper and I recall that being 18  ft lbs, the front cover of this manual I just downloaded from the Jab Aus site  says it's applicable to all 2200a engines. The 'soft headed' ones all surely  bend at 22 lbs... 

What vintage is your engine? And the heads? 

Regards, Clive 

  

[img]cid:649100620(at)13102010-1658[/img]



-----Original  Message-----

From: James, Clive R

Sent: 13 October 2010 21:00

To:  'jabiruengine-list(at)matronics.com'

Subject: RE: Re:  Adjusting screw torque



Section 5.3 'Initial after 25 hours checks'

in  all the manuals I have here.



I recall lately there is two torques, one  for building the engine and one for checking afterwards.

The setting in 5.3  is the one to check for.



What is your serial number of the engine and  what engine? 2200/3300?



Regards, Clive

-----Original  Message-----

From: owner-jabiruengine-list-server(at)matronics.com [mailto:owner-jabiruengine-list-server(at)matronics.com (owner-jabiruengine-list-server(at)matronics.com)]  On Behalf Of 4aplat

Sent: 13 October 2010 18:28

To:  jabiruengine-list(at)matronics.com

Subject: Re: Adjusting  screw torque



--> JabiruEngine-List message posted by:  "4aplat"

--> <ulm(at)ascenseur-parisien.com>



Hi Clive



Is  it possible to know where it's possible to find 18 (20 or 24) in the manual  ?



thanks in advance



MIcheL

Clive J wrote:

 	  Quote: 	
		    Indeed the wording is not good.



 Need to be careful with 24  ft/lbs, this doesn't apply to all engines.

 I believe it's 18, 20 and 24  depending on which engine you have (I

 maybe wrong about the 18, I only  have a 2000 and a 2003 manual here).



 Regards,  Clive



 --


	




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http://jabiru-owner.com





Read  this topic online here:



http://forums.matronics.com/viewtopic.php?p=315595#315595

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checkpoint2(at)comcast.ne
Guest

Posted: Wed Oct 13, 2010 1:25 pm Post subject: Adjusting screw torque

That always worked for me.  Bob Haas



--

matronics(at)rtist.nl
Guest

Posted: Wed Oct 13, 2010 10:35 pm Post subject: Adjusting screw torque

One remark on this. The text mentions not to back  off the studs. After working with Roger on my engine and discussing I am  convinced that's bad advice.

  

 The bolts go all the way through the head and screw  into the cylinder. On my engine, the exposed threads had corrosion on them.  This corrosion caused the bolts not to move at 24lbs even though the heads were  starting to leak. Do check for corrosion, use WD40 or similar to lubricate the  corroded end and back off the stud a little bit. Then retighten at 24lbs/ft  (or whatever your vintage manual tells you).

  

 Rob

  

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4aplat

Joined: 12 Oct 2010
Posts: 9

Posted: Wed Oct 13, 2010 11:47 pm Post subject: Re: Adjusting screw torque

It's a 2200 serial #570



I'm not looking for the torque for the cylinder heads but for the valve clearance adjusting screw (and nut)



MicheL

 	  Clive J wrote: 	
		  

What vintage is your engine? And the heads? 

Regards, Clive

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Thu Oct 14, 2010 1:38 am Post subject: Adjusting screw torque

For the same reason on older heads where they deform check  by backing off and if necessary take the bolts out and clear the hole out with a  drill bit.

 My old heads on the 2200 twisted badly (#596) and I had  trouble getting the head bolts out for this reason.

 CJ



   From:  owner-jabiruengine-list-server(at)matronics.com  [mailto:owner-jabiruengine-list-server(at)matronics.com] On Behalf Of Rob  Turk

Sent: 14 October 2010 07:31

To:  jabiruengine-list(at)matronics.com

Subject: Re: Re:  Adjusting screw torque

 

 One remark on this. The text mentions not to back  off the studs. After working with Roger on my engine and discussing I am  convinced that's bad advice.

  

 The bolts go all the way through the head and screw  into the cylinder. On my engine, the exposed threads had corrosion on them.  This corrosion caused the bolts not to move at 24lbs even though the heads were  starting to leak. Do check for corrosion, use WD40 or similar to lubricate the  corroded end and back off the stud a little bit. Then retighten at 24lbs/ft  (or whatever your vintage manual tells you).

  

 Rob

  

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Thu Oct 14, 2010 1:39 am Post subject: Adjusting screw torque

Michel, that was the one where we don't have a reading and a suggested

you practised a bit with locking and un locking the screw until you

'felt' it was right.

Ring spanner hand tight.



Good discussion spawned anyhow,



Regards, Clive 



--

wypaul

Joined: 08 Jun 2007
Posts: 24

Posted: Sun Oct 17, 2010 6:53 am Post subject: Re: Adjusting screw torque

If you have tighten all of the adjusters to 24 ft/lb then you should replace all of the adjustment studs and nuts to avoid in flight failure. IMHO



Paul

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Q-2 Jabiru 3300

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