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DIFFICULT START -52

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Bill1200

Joined: 19 Oct 2008
Posts: 111
Location: medford oregon

Posted: Mon Apr 13, 2015 10:47 am Post subject: DIFFICULT START -52

Background:

Just replaced engine with, as far as we can tell from the Russian logs, an IRAN engine that has been sitting for 10 years. Initially, very difficult to start, requiring essentially constant priming to keep it turning. Replaced carburetor with old one off prior engine I was using. Now runs well but still requires lots of priming once it fires, for a few seconds.

Have noticed when primer knob turned to left to pressurize system, nothing is showing on fuel pressure gage. Once started, fuel pressure normal

Thoughts?

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wlannon(at)shaw.ca
Guest

Posted: Mon Apr 13, 2015 7:17 pm Post subject: DIFFICULT START -52

Chances are there is nothing wrong with your carburettor.   If the engine 

was inhibited for storage it is quite likely the carb. was done as well. 

There is a specific process in the manual (at least for the Huosai so I 

assume also in the M14 manual) to clean the oil out of it.   It could take a 

very long time to get it operational if that is not done.

Also check the small tube in the throat of the carb.   As part of the 

storage process it may be capped off with a rubber condom.   If so the 

diaphragm chamber does not sense atmospheric pressure and the carb. will not 

function.

Not being familiar with the Yak 52 I don't know which way it turns for 

priming (I would guess to the left).   The CJ uses the same primer but is 

plumbed to prime from either side since it has a separate emergency pump. 

There would be no fuel pressure indication from priming since the fuel goes 

directly into the induction system.



Walt



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dsavarese0812(at)bellsout
Guest

Posted: Tue Apr 14, 2015 5:42 am Post subject: DIFFICULT START -52

Only one comment. Although the CJ and Yak 52 primer pumpknobs look the 

same, the Yak 52 uses the primer pump knob turned to the left to 

pressurize the fuel system. When the primer pump knob is turned to the 

right, it primes the "cylinder" side.  So when the primer pump knob is 

turned to the left and pumped briskly, it will pressurize the fuel 

system and thus give a fuel pressure indication on the fuel pressure 

instrument.



I have found unless you pump fairly briskly with the knob turned to the 

left, it may not give a fuel pressure indication.

Dennis



A. Dennis Savarese

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 4/13/2015 10:16 PM, Walter Lannon wrote:

[quote] 



 Chances are there is nothing wrong with your carburettor.   If the 

 engine was inhibited for storage it is quite likely the carb. was done 

 as well. There is a specific process in the manual (at least for the 

 Huosai so I assume also in the M14 manual) to clean the oil out of 

 it.   It could take a very long time to get it operational if that is 

 not done.

 Also check the small tube in the throat of the carb.   As part of the 

 storage process it may be capped off with a rubber condom. If so the 

 diaphragm chamber does not sense atmospheric pressure and the carb. 

 will not function.

 Not being familiar with the Yak 52 I don't know which way it turns for 

 priming (I would guess to the left).   The CJ uses the same primer but 

 is plumbed to prime from either side since it has a separate emergency 

 pump. There would be no fuel pressure indication from priming since 

 the fuel goes directly into the induction system.



 Walt



 --

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cerveirapinto(at)gmail.co
Guest

Posted: Tue Apr 14, 2015 6:00 am Post subject: DIFFICULT START -52

Probably you have air in primer fuel system hose(Top right).Just release a little bit the nut of corresponding hose and pump until fuel goes out and you have fuel pressure on system indicator.Good luck

2015-04-14 14:42 GMT+01:00 A. Dennis Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)>:

[quote]--> Yak-List message posted by: "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)>

 

 Only one comment. Although the CJ and Yak 52 primer pumpknobs look the same, the Yak 52 uses the primer pump knob turned to the left to pressurize the fuel system. When the primer pump knob is turned to the right, it primes the "cylinder" side.  So when the primer pump knob is turned to the left and pumped briskly, it will pressurize the fuel system and thus give a fuel pressure indication on the fuel pressure instrument.

 

 I have found unless you pump fairly briskly with the knob turned to the left, it may not give a fuel pressure indication.

 Dennis

 

 A. Dennis Savarese

 334-546-8182 (mobile)

 www.yak-52.com

 Skype - Yakguy1

 

 On 4/13/2015 10:16 PM, Walter Lannon wrote:

 [quote] --> Yak-List message posted by: "Walter Lannon" <wlannon(at)shaw.ca (wlannon(at)shaw.ca)>

 

 Chances are there is nothing wrong with your carburettor.   If the engine was inhibited for storage it is quite likely the carb. was done as well. There is a specific process in the manual (at least for the Huosai so I assume also in the M14 manual) to clean the oil out of it.   It could take a very long time to get it operational if that is not done.

 Also check the small tube in the throat of the carb.   As part of the storage process it may be capped off with a rubber condom. If so the diaphragm chamber does not sense atmospheric pressure and the carb. will not function.

 Not being familiar with the Yak 52 I don't know which way it turns for priming (I would guess to the left).   The CJ uses the same primer but is plumbed to prime from either side since it has a separate emergency pump. There would be no fuel pressure indication from priming since the fuel goes directly into the induction system.

 

 Walt

 

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Viperdoc

Joined: 19 Apr 2014
Posts: 484
Location: 08A

Posted: Tue Apr 14, 2015 4:45 pm Post subject: DIFFICULT START -52

First place I would look is the Banjo fittings going into the carb. Did you replace the aluminum crush washers or use the old ones. 

Doc



Sent from my iPad



 	  Quote: 	
		   On Apr 13, 2015, at 1:47 PM, Bill1200 <billdykes52(at)hotmail.com> wrote:

 

 

 

 Background:

 Just replaced engine with, as far as we can tell from the Russian logs, an IRAN engine that has been sitting for 10 years. Initially, very difficult to start, requiring essentially constant priming to keep it turning. Replaced carburetor with old one off prior engine I was using. Now runs well but still requires lots of priming once it fires, for a few seconds.

 Have noticed when primer knob turned to left to pressurize system, nothing is showing on fuel pressure gage. Once started, fuel pressure normal

 Thoughts?

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=440793#440793

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_________________
Viperdoc

Bill1200

Joined: 19 Oct 2008
Posts: 111
Location: medford oregon

Posted: Sat Apr 18, 2015 10:55 am Post subject: Re: DIFFICULT START -52

Thanks to all



Replaced crush washers during engine replacement



Anyways, two more test flights since last post, and all seems to be working itself out. Starting much easier, running smooth.

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Viperdoc

Joined: 19 Apr 2014
Posts: 484
Location: 08A

Posted: Sun Apr 19, 2015 7:46 am Post subject: DIFFICULT START -52

Roger that. Those aluminum washers are pretty useless second time around.

Doc



Sent from my iPad



 	  Quote: 	
		   On Apr 18, 2015, at 2:55 PM, Bill1200 <billdykes52(at)hotmail.com> wrote:

 

 

 

 Thanks to all

 

 Replaced crush washers during engine replacement

 

 Anyways, two more test flights since last post, and all seems to be working itself out. Starting much easier, running smooth.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=440978#440978

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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:

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_________________
Viperdoc

Viperdoc

Joined: 19 Apr 2014
Posts: 484
Location: 08A

Posted: Sun Apr 19, 2015 7:47 am Post subject: DIFFICULT START -52

Summit Racing and McMaster Carr has them.

Doc

Sent from my iPad



 	  Quote: 	
		   On Apr 18, 2015, at 2:55 PM, Bill1200 <billdykes52(at)hotmail.com> wrote:

 

 

 

 Thanks to all

 

 Replaced crush washers during engine replacement

 

 Anyways, two more test flights since last post, and all seems to be working itself out. Starting much easier, running smooth.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=440978#440978

- The Matronics Yak-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:

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_________________
Viperdoc

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