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Hard starting CJ

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CJcanuck

Joined: 05 Jul 2006
Posts: 39

Posted: Sun Nov 18, 2007 5:32 pm Post subject: Hard starting CJ

Hi All!



I went to fly my birdie tonight only to have it not start, and act very strangely in the process.



The pre-start pressure was around 40-45atm, and for the first few seconds during the start the prop seemed to be swinging at it's usual rate.  Very quickly though both the prop rpm and the main air pressure dropped; the bottle showing close to 10atms and the prop slowed to a stop.



When I went to refill the air tank it regained it's pressure very quickly, in less than 30 seconds.  During past refills it took several minutes to refill the tank from near empty to around 45atms.



It's almost like the system has reduced in volume somehow, any ideas where I might start looking?  In addition, the starter valve is sticking open; you take your finger off the button and the starter stays open, not sure if it's a solenoid issue or a button issue.



Thanks!



p.s.  YMK has always been a hard starter; I know some of you only see 1-2 blades before the engine kicks, we normally need over 10seconds before anything close to sustained firing with lots of prime and skinned knuckles.  Could this be related?

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rvfltd(at)televar.com
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Posted: Mon Nov 19, 2007 11:57 am Post subject: Hard starting CJ

Heated  hanger?  If not consider ice from past undrained condensation in 

the air system.   Because the system filled so rapidly the air was 

always there, but somehow blocked.  What are your temps?



Always Yakin,

Doug



CJcanuck wrote:



 	  Quote: 	
		  



Hi All!



I went to fly my birdie tonight only to have it not start, and act very strangely in the process.



The pre-start pressure was around 40-45atm, and for the first few seconds during the start the prop seemed to be swinging at it's usual rate.  Very quickly though both the prop rpm and the main air pressure dropped; the bottle showing close to 10atms and the prop slowed to a stop.



When I went to refill the air tank it regained it's pressure very quickly, in less than 30 seconds.  During past refills it took several minutes to refill the tank from near empty to around 45atms.



It's almost like the system has reduced in volume somehow, any ideas where I might start looking?  In addition, the starter valve is sticking open; you take your finger off the button and the starter stays open, not sure if it's a solenoid issue or a button issue.



Thanks!



p.s.  YMK has always been a hard starter; I know some of you only see 1-2 blades before the engine kicks, we normally need over 10seconds before anything close to sustained firing with lots of prime and skinned knuckles.  Could this be related?





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CZ

Joined: 20 Nov 2006
Posts: 21

Posted: Mon May 05, 2008 6:40 am Post subject: Re: Hard starting CJ

Hello,



What turned out to be the problem with your starter?

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CJcanuck

Joined: 05 Jul 2006
Posts: 39

Posted: Tue May 06, 2008 6:13 am Post subject: Re: Hard starting CJ

No real solution found.  We pulled apart the water separator (it was a mess and ultimate replaced it), blew out what lines we could access in the engine compartment and ran a bunch of WD-40 through the electropneumatic starter.  I fired her up a few days ago and had the usual struggle getting her going, but then she has sat for a couple of months so I wasn't surprised.  The air consumption was more in line with what we were expecting.  So.. no real answer yet.



Mike

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