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CJ6a Housai cylinder head cracked

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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Wed Feb 02, 2011 8:32 am Post subject: CJ6a Housai cylinder head cracked

Good afternoon.



Well its not been a good day thus far, we've discovered a cylinder head crack right across the exhaust valve seat and into the head on No. 5 cylinder 



The engine has not been run since it left the PLAAF so I'm assuming poor handling (possible over-cooling in the descent, who knows????). Maybe they will help out with parts but I dont know yet...



Can the head be swapped without replacing cylinder and piston? OR do we need to replace the whole of No5 assembly?



Any experiences or previous findings would be greatly appreciated!



Regards



Harv

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dsavarese0812(at)bellsout
Guest

Posted: Wed Feb 02, 2011 11:36 am Post subject: CJ6a Housai cylinder head cracked

I would recommend replacing the #5 cylinder; the complete assembly. If 

you were to try to remove the head from the barrel, you'd still have to 

remove the cylinder completely.  Then to find just the head might be a 

challenge.  Definitely not worth the effort and cost.    Call Doug as 

I'm confident he can supply you with a cylinder.

Dennis



On 2/2/2011 10:32 AM, Harv wrote:

 	  Quote: 	
		   



 Good afternoon.



 Well its not been a good day thus far, we've discovered a cylinder head crack right across the exhaust valve seat and into the head on No. 5 cylinder 



 The engine has not been run since it left the PLAAF so I'm assuming poor handling (possible over-cooling in the descent, who knows????). Maybe they will help out with parts but I dont know yet...



 Can the head be swapped without replacing cylinder and piston? OR do we need to replace the whole of No5 assembly?



 Any experiences or previous findings would be greatly appreciated!



 Regards



 Harv





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=329305#329305

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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Wed Feb 02, 2011 12:04 pm Post subject: Re: CJ6a Housai cylinder head cracked

Cheers,



I'm potentially looking at removing all the cylinders for an inspection and clean up of valves and seats, re-lapping etc. The trouble as I can see it is you just don't know whats gone on with it in the past?



Can tdc height of the pistons be measured closely enough to establish if we had any bent connecting rods  from hydraulic'd cylinders?



Thus might be an opportunity to fit total seal piston rings? Not that I want to create more work, I just want the peace of mind.



Rgs



Harv

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dsavarese0812(at)bellsout
Guest

Posted: Wed Feb 02, 2011 12:42 pm Post subject: CJ6a Housai cylinder head cracked

Even if you were able to accurately measure the link rod lengths (the 

master rod is the shortest and there are 4 other link rod lengths 

ranging from .15mm to .39mm longer), I don't think that would give you 

the peace of mind you're looking for.   I've always believed that peace 

of mind equals a bit more work.  And since you fly behind this engine, a 

bit more work WOULD be well worth the effort and give you the peace of 

mind you're looking for.

Dennis



On 2/2/2011 2:04 PM, Harv wrote:

 	  Quote: 	
		   



 Cheers,



 I'm potentially looking at removing all the cylinders for an inspection and clean up of valves and seats, re-lapping etc. The trouble as I can see it is you just don't know whats gone on with it in the past?



 Can tdc height of the pistons be measured closely enough to establish if we had any bent connecting rods  from hydraulic'd cylinders?



 Thus might be an opportunity to fit total seal piston rings? Not that I want to create more work, I just want the peace of mind.



 Rgs



 Harv





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=329327#329327

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Harv

Joined: 01 Jul 2010
Posts: 172

Posted: Wed Feb 02, 2011 12:55 pm Post subject: Re: CJ6a Housai cylinder head cracked

I does make me wonder what caused the cracked valve seat.



Whats the best procedure for checking straightness of the rods?



TIA



Harv

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