Matronics Email Lists :: View topic - [ Bob Haas ] : New Email List Photo Share Available!

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

[ Bob Haas ] : New Email List Photo Share Available!

Matronics Email Lists Forum Index -> JabiruEngine-List

View previous topic :: View next topic

Author Message

BobTezyk

Joined: 10 Jan 2006
Posts: 38
Location: Midlothian, TX

Posted: Tue May 08, 2007 5:45 am Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Yes Bob,



We are out here.  Just we just have nothing important to say right now.



Do not Archive



Bob Tezyk

601XL QB J3300

Building Elevators



 	  Quote: 	
		   ________________________________  Message 1 

 _____________________________________

 Time: 01:26:27 PM PST US

 Subject: [ Bob Haas ] : New Email List Photo Share 

 Available!

 From: Email List Photo Shares <pictures(at)matronics.com>



 A new Email List Photo Share is available:



 Poster:  Bob Haas <checkpoint2(at)comcast.net>



 Lists:   JabiruEngine-List



 Subject: Sensenich Ground Adjustable Prop



 http://www.matronics.com/photoshare/checkpoint2(at)comcast.net.05.07.2007/index.html

hulens61(at)comcast.net
Guest

Posted: Tue May 08, 2007 6:06 am Post subject: [ Bob Haas ] : New Email List Photo Share Available!

 	  Quote: 	
		   We are out here.  Just we just have nothing important to say right now.

 > Bob Tezyk


	




++ Yep, we're out here waiting for something earth-shaking to respond to!



Fred           280 hours 3300/Zenith 601HDS

Do not archive

Lynn Matteson

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

Posted: Tue May 08, 2007 1:11 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Well, try this one on for size:

I have had to adjust my valve clearance several times recently, and  

when I did it a few days ago, I found brass-colored metallic  

particles inside one of the valve covers. I removed the oil filter  

and cut it apart and found a few specks of the same material in the  

filter. I removed the rocker shaft from the head to inspect the  

rocker arm bushings, and found them in very poor shape, having lost  

their teflon coating on the bottom of the bushing, and exposing the  

sintered brass backing. The shafts are in good shape, slightly  

discolored, but not worn.

Anybody else have a problem with valve lash? If you do, there's a  

good chance that the bushings are worn, causing the lash to increase.

I did some research on the bushings, and found that they will  

withstand over 400 degrees F, but could find no specs on how much  

pressure the bushings will endure.

Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/275+ hrs

On May 8, 2007, at 10:06 AM, Fred Hulen wrote:

 	  Quote: 	

 <hulens61(at)comcast.net>

> We are out here.  Just we just have nothing important to say right  

> now.

> > Bob Tezyk

 ++ Yep, we're out here waiting for something earth-shaking to  

 respond to!

 Fred           280 hours 3300/Zenith 601HDS

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Peter H

Joined: 20 Mar 2007
Posts: 197

Posted: Tue May 08, 2007 1:19 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Lynn, nice to hear a voice or two on this list. How many hours on that

engine and what oil have you been using? (I have only 25hours but counting)

Regards

Peter H



--

milreed(at)directcon.net
Guest

Posted: Tue May 08, 2007 2:40 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

What prompted you to check ? Noisy, or was it a routine check. Keep it 

going.

Mil



---

Lynn Matteson

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

Posted: Tue May 08, 2007 5:11 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

I've been here since day one, but have held off posting much of  

anything on this group (I also watch the Yahoo one) until now...lack  

of anything to write about. But I've got a couple of issues to talk  

about...more later.



I've got about 280 hours on it since it was first flown about 13  

months ago. I used the mineral oil break-in oil recommended, then  

switched to Aeroshell 100W after that. During the winter I used  

Aeroshell 15W-50. I've always changed the oil at 25-30 hours, with  

the filter.

I enjoy the engine very much, and try not to bad-mouth it, but  

recently I've had a couple of disturbing incidents. Anybody looked  

inside their distributor caps lately?



Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/275+ hrs



On May 8, 2007, at 5:17 PM, Peter Harris wrote:



[quote] 

 <peterjfharris(at)bigpond.com>



 Lynn, nice to hear a voice or two on this list. How many hours on that

 engine and what oil have you been using? (I have only 25hours but  

 counting)

 Regards

 Peter H



 --

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Lynn Matteson

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

Posted: Tue May 08, 2007 5:39 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

After just the suggested checking at the proscribed hour, and  

checking during the suggested head torque period, it came to me that  

the engine was running more roughly...vibrating, actually...and  

knowing engines as I do, I knew this could be caused by a cylinder  

being off on valve lash. (If cylinders are dissimilar in their valve  

lash, the power output is affected, hence it runs rough or vibrates.  

It's a whole lot more noticeable on a 4-cylinder than on a higher  

number of cylinders) After a lash re-setting, the engine ran fine.  

When I found the brassy-colored particles the other day, inside the  

rocker cover, and then "fingering" the rocker arms for slop, I  

decided to pull the rocker shafts and have a look at the bushings.  

What I found was a loss of the teflon coating where the arm contacts  

the rocker shaft. I took the parts to an engine-knowledgeable person  

locally, and he immediately recognized the bearing material as a DU  

bearing material...do a google search for DU and read the interesting  

history about this technology.

When I contacted my dealer, he said that apparently there is no  

problem in the history of the Jabiru line of engines.

Perhaps there is no problem, but I've seen what my bearings look like  

and I don't like the looks, and will be changing bushings soon. Since  

I am out of warranty, I don't expect Jabiru to do anything for me, so  

I'm taking the repair into my own hands.



  Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/275+ hrs

On May 8, 2007, at 6:39 PM, Milburn Reed wrote:



 	  Quote: 	
		   

 <milreed(at)directcon.net>



 What prompted you to check ? Noisy, or was it a routine check. Keep  

 it going.

 Mil

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Peter H

Joined: 20 Mar 2007
Posts: 197

Posted: Tue May 08, 2007 8:11 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

I got a vast improvement in smooth running when I had my wooden prop

dynamically balanced even though I had spent hours to achieve a perfect

static balance. When the dynamic weights were added it was like a new

engine.

Peter J3300 25hrs



--

JohnDRead(at)AOL.COM
Guest

Posted: Tue May 08, 2007 8:35 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Did you try emailing the factory rather than the dealer about this  problem?

  

 John Read

 do not archive



See what's free at AOL.com. 

  [quote][b]

Lynn Matteson

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

Posted: Wed May 09, 2007 5:10 am Post subject: [ Bob Haas ] : New Email List Photo Share Available!

What kind/make prop? Mine's a Sensenich, and was smooth running from  

the git-go. My engine started out smooth as silk, but over the hours  

got mild vibration due to the valve lash loosening. After each new  

setting, back to smooth again.



Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/275+ hrs

On May 9, 2007, at 12:10 AM, Peter Harris wrote:



 	  Quote: 	
		   

 <peterjfharris(at)bigpond.com>



 I got a vast improvement in smooth running when I had my wooden prop

 dynamically balanced even though I had spent hours to achieve a  

 perfect

 static balance. When the dynamic weights were added it was like a new

 engine.

 Peter J3300 25hrs

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Lynn Matteson

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

Posted: Wed May 09, 2007 5:32 am Post subject: [ Bob Haas ] : New Email List Photo Share Available!

I don't know who this question if for , because you didn't include at  

least a snippet of the post you're referring to, but I'll take a  

chance it was about the valve lash/rocker arm bushing thread.

No, I didn't email the factory, because I've always heard that the  

factory doesn't answer their emails. Besides, I've always had good  

luck just phoning the dealers here in the USA. That is until another,  

previous problem, came up and I never got an answer to my 2 emails  

(including pictures) to each of the 3 US dealers....solved that one  

on my own.

I guess it wouldn't hurt to email the factory, and see what they have  

to say. I'm not trying to bad mouth the dealers, I just want to get  

some answers, or alert somebody to a possible problem.



Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/275+ hrs

do not archive

On May 9, 2007, at 12:35 AM, JohnDRead(at)aol.com wrote:



 	  Quote: 	
		   Did you try emailing the factory rather than the dealer about this  

 problem?



 John Read

 do not archive



 See what's free at AOL.com.

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

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


	


Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/275+ hrs

do not archive

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

hulens61(at)comcast.net
Guest

Posted: Wed May 09, 2007 6:58 am Post subject: [ Bob Haas ] : New Email List Photo Share Available!

 	  Quote: 	
		   I got a vast improvement in smooth running when I had my wooden prop

 dynamically balanced even though I had spent hours to achieve a perfect

 static balance. When the dynamic weights were added it was like a new

 engine.

 Peter J3300 25hrs


	


++ Hey Peter, please tell me more about the particular process you went 

through to dynamically balance your prop.  I went to a specialty place to 

have mine done but after about an hour of applying sensors and getting all 

of their equipment ready to actually do it, the guy asked that I run the 

engine at 2500 rpm for 5 minutes!  My cooling is just fine in normal 

operations but there's no way could I sit there on the ground and run it at 

2500 rpms for 5 minutes without getting too hot.  Please tell me some of the 

particulars when you had yours done.

Thanks

Fred

Peter H

Joined: 20 Mar 2007
Posts: 197

Posted: Wed May 09, 2007 1:16 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Lynn

My prop is from Ed Sterba and I have been trimming it, also there were

issues with the spinner backing plate. But my experience proved that static

balance was not enough. It was not until dynamic balance that I discovered

how smooth is smooth.

By valve lash do you mean that the tappet clearances were regularly becoming

uneven?

Peter H



--

info(at)usjabiru.com
Guest

Posted: Wed May 09, 2007 1:44 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Peter,



Where did you attach the weights to the prop or spinner to balance it?  How

much weight did it take?  We are about to go into the dynamic balancing

business and are not sure just yet as to where to attach the weights.



Pete Krotje

Jabiru USA Sport Aircraft, LLC



--

Lynn Matteson

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

Posted: Wed May 09, 2007 2:58 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Yes, valve lash is what it is sometimes referred to over here. It  

used to be called tappet clearance (in the days of flathead engines)  

when in fact you were setting the clearances *at* the tappet (cam  

follower), but with overhead valve engines, the term valve clearance  

or valve lash is used...here at least. When dealing with a small  

number of cylinders, any cylinder which has its valves mis-adjusted  

will operate at less power than the others, causing the vibration or  

imbalance. This is partly due to less *effective* camshaft lift  

(looser clearance setting), or maybe keeping the valve open when it  

should be closed (tighter to 'zero' clearance setting).

Lynn Matteson

Grass Lake, Michigan

Kitfox IV Speedster  w/Jabiru 2200

flying w/275+ hrs

do not archive



On May 9, 2007, at 5:14 PM, Peter Harris wrote:



 	  Quote: 	
		   

 <peterjfharris(at)bigpond.com>



 Lynn

 My prop is from Ed Sterba and I have been trimming it, also there were

 issues with the spinner backing plate. But my experience proved  

 that static

 balance was not enough. It was not until dynamic balance that I  

 discovered

 how smooth is smooth.

 By valve lash do you mean that the tappet clearances were regularly  

 becoming

 uneven?

 Peter H

_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

Peter H

Joined: 20 Mar 2007
Posts: 197

Posted: Wed May 09, 2007 9:05 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Pete the maintenance shop here did the job and they have a lot of experience

with the equipment, using electronic equipment which they said cost $6000. A

vibration sensor is attached to the engine near centre front just behind the

prop. A laser is fitted where it will see the reflection from tape on the

prop. The two inputs establish weight and position. The control unit is

attached to the sensor and laser by long leads. The backing disc for the

spinner was indexed and I ran the engine up to 2700 rpm and the first read

out called up weights and a location. At this stage washers were selected

and weighed using a very sensitive electronic scale part of the kit which

measures to .01 G . The washers were fitted for convenience to the nearest

spinner attach screw and we ran again twice more with small adjustments to

the weights, then we calculated by proportion how much weight to fix at a

convenient hidden point at a smaller radius inside the backing plate. From

memory it took about 1.5G which we did with a short bolt and some washers

weighed using the e scale.   

What impressed me was how much smoother it bran right from the first

addition. I think it is a good starting point for the flywheel bolts job.I

think your customers will be happy with the result. It took about 45min.

Peter



--

Peter H

Joined: 20 Mar 2007
Posts: 197

Posted: Wed May 09, 2007 9:23 pm Post subject: [ Bob Haas ] : New Email List Photo Share Available!

Hi Fred,

I covered most of the details in my post to Pete . From the point of view of

overheating it was not really an issue. I had the cowls off and each run up

was for only a minute or so, then there was down time for interpreting the

results, selecting and weighing the weights etc. and I switched off for

this. There was a total of 3 power runs and the whole job took about 45

mins. I would guess that 50% of the time was down time devoted to selecting

and weighing and adding the weights.

Let me know if you have any other questions.

Peter



--

Display posts from previous:

	Matronics Email Lists Forum Index -> JabiruEngine-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum