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Yak 52 Primer issue

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ZUDSJ

Joined: 29 Nov 2014
Posts: 8
Location: South Africa

Posted: Thu Jul 18, 2019 12:13 am Post subject: Yak 52 Primer issue

Perplexed by the primer and hoping to get some info if possible. Does anyone have a diagram of the Yak 52 primer? 

It was quite tight and when we attempted to prime the system no pressure appeared on the fuel pressure gauge. We loosened the friction nut to the point that it was removed completelyâ€¦ When we put it back it would prime the system and the cylinder but we could not rotate it to the centred position. Even though no fuel pressure was showing while priming, there was fuel going to the cylinders because it flowed out when we opened the manifold valve at the bottom of the engine. If we tighten the friction nut it does not move at all. When we loosen the friction nut again it can rotate left and right but not go back to the centre. Anyone had this experience?

wlannon(at)shaw.ca
Guest

Posted: Thu Jul 18, 2019 9:07 am Post subject: Yak 52 Primer issue

Where to begin!



The Yak 52 "primer" is a dual unit with a central OFF position.   One side 

when selected is a hand pump delivering fuel through the by-pass in the 

engine driven fuel pump to the carb.  It is an emergency pump in the event 

of primary (engine driven) pump failure.



The other side is a primer delivering fuel to the top of the blower chamber 

through a nozzle where (in theory) it is atomized and delivered by blower 

(supercharger) rotation to the cylinders.  In fact (IMHO) it mostly just 

flows down the chamber walls to the #5 cylinder where (if you have your head 

up your ass) it will give you a hydraulic lock.



Since I have a CJ I don't know which side is which! (Dennis?)  The CJ uses 

exactly the same unit however it is modified to act as a primer only on 

either side.  Very simple, short by-pass tube.  The hand (emerg.) fuel pump 

is a separate unit (wobble pump).



Presumably you have removed the pump handle and on re-installing it have 

filed to align the drive for the valve control.  Find a 1/2" or so wood 

dowel and file a notch in one end so you can correct that.



Walt

--

wlannon(at)shaw.ca
Guest

Posted: Thu Jul 18, 2019 9:25 am Post subject: Yak 52 Primer issue

Typo in my last - "filed" should read "failed".



Also should have noted there is no fuel pressure indication for the "prime" 

operation.



Walt



--

dsavarese0812(at)bellsout
Guest

Posted: Thu Jul 18, 2019 10:08 am Post subject: Yak 52 Primer issue

Primer left is the system side. Primer right is cylinder side. Up/center is off. 

Dennis



Sent from my iPhone



[quote] On Jul 18, 2019, at 12:24 PM, Walter Lannon <wlannon(at)shaw.ca> wrote:

 

 

 

 Typo in my last - "filed" should read "failed".

 

 Also should have noted there is no fuel pressure indication for the "prime" operation.

 

 Walt

 

 --

markbitterlich(at)embarqm
Guest

Posted: Thu Jul 18, 2019 1:31 pm Post subject: Yak 52 Primer issue

Unless you own a YAK-50 and then it's reversed!  (Hi Dennis!)  



Mark

-------- Original message --------

From: Anthony Savarese <dsavarese0812(at)bellsouth.net> 

Date: 7/18/19  14:07  (GMT-05:00) 

To: yak-list(at)matronics.com 

Subject: Re: Yak-List: Yak 52 Primer issue 



--> Yak-List message posted by: Anthony Savarese <dsavarese0812(at)bellsouth.net>



Primer left is the system side. Primer right is cylinder side. Up/center is off. 

Dennis



Sent from my iPhone



[quote] On Jul 18, 2019, at 12:24 PM, Walter Lannon <wlannon(at)shaw.ca> wrote:

 

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

 

 Typo in my last - "filed" should read "failed".

 

 Also should have noted there is no fuel pressure indication for the "prime" operation.

 

 Walt

 

 --

dsavarese0812(at)bellsout
Guest

Posted: Thu Jul 18, 2019 3:17 pm Post subject: Yak 52 Primer issue

Very true. Dennis



Sent from my iPhone



On Jul 18, 2019, at 4:30 PM, mark bitterlich <markbitterlich(at)embarqmail.com (markbitterlich(at)embarqmail.com)> wrote:

[quote]Unless you own a YAK-50 and then it's reversed!  (Hi Dennis!)  



Mark

-------- Original message --------

From: Anthony Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> 

Date: 7/18/19  14:07  (GMT-05:00) 

To: yak-list(at)matronics.com (yak-list(at)matronics.com) 

Subject: Re: Yak-List: Yak 52 Primer issue 



--> Yak-List message posted by: Anthony Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)>



Primer left is the system side. Primer right is cylinder side. Up/center is off. 

Dennis



Sent from my iPhone



[quote] On Jul 18, 2019, at 12:24 PM, Walter Lannon <wlannon(at)shaw.ca (wlannon(at)shaw.ca)> wrote:

 

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

 

 Typo in my last - "filed" should read "failed".

 

 Also should have noted there is no fuel pressure indication for the "prime" operation.

 

 Walt

 

 --

ZUDSJ

Joined: 29 Nov 2014
Posts: 8
Location: South Africa

Posted: Thu Jul 18, 2019 3:30 pm Post subject: Re: Yak 52 Primer issue

Thanks guys for your feedback. My question was more around how I could get it back to the centre as somethings stopping that. Could you give me more detail on what I should do with the dowel Walt? I donâ€™t understand the mechanics of the primer hence I was looking for a diagram. Thanks guys!

dsavarese0812(at)bellsout
Guest

Posted: Thu Jul 18, 2019 3:57 pm Post subject: Yak 52 Primer issue

If you removed it completel it could be upside down ou youâ€™ve got the knurled ring to loose and it wonâ€™t bottom out. 

Dennis



Sent from my iPhone



 	  Quote: 	
		   On Jul 18, 2019, at 6:30 PM, ZUDSJ <waferflex(at)gmail.com> wrote:

 

 

 

 Thanks guys for your feedback. My question was more around how I could get it back to the centre as somethings stopping that. Could you give me more detail on what I should do with the dowel Walt? I donâ€™t understand the mechanics of the primer hence I was looking for a diagram. Thanks guys!

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=490409#490409

peter(at)scottbase.id.au
Guest

Posted: Thu Jul 18, 2019 5:21 pm Post subject: Yak 52 Primer issue

When my primer has resisted turning back to centre from cylinder priming, pushing the handle in hard while turning has released it. But I note Anthony's cautionary advice that if plunger has been replaced upside down pushing would not help. if the knurled ring is loose, maybe also? Peter.

Peter Scott

On Fri, Jul 19, 2019 at 10:07 AM Anthony Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> wrote:

 	  Quote: 	
		  --> Yak-List message posted by: Anthony Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)>

 If you removed it completel it could be upside down ou youâ€™ve got the knurled ring to loose and it wonâ€™t bottom out. 

 Dennis

 Sent from my iPhone

 > On Jul 18, 2019, at 6:30 PM, ZUDSJ <waferflex(at)gmail.com (waferflex(at)gmail.com)> wrote:

 > 

 > --> Yak-List message posted by: "ZUDSJ" <waferflex(at)gmail.com (waferflex(at)gmail.com)>

 > 

 > Thanks guys for your feedback. My question was more around how I could get it back to the centre as somethings stopping that. Could you give me more detail on what I should do with the dowel Walt? I donâ€™t understand the mechanics of the primer hence I was looking for a diagram. Thanks guys!

 > 

 > 

 > 

 > 

 > Read this topic online here:

 > 

 > http://forums.matronics.com/viewtopic.php?p=490409#490409

 > 

 > 

 > 

 > 

 > 

 > 

 > 

 > 

 > 

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wlannon(at)shaw.ca
Guest

Posted: Thu Jul 18, 2019 8:33 pm Post subject: Yak 52 Primer issue

Hi;



With the plunger handle in the center position remove the complete plunger 

assy.   Note the position of the slot at the bottom of the plunger relative 

to the position of the handle.  Note the position of the mating tang at the 

bottom of the primer body.  If not in alignment with the plunger slot use 

the slotted dowel to press downwards and rotate the tang to line up with the 

plunger slot.



Re-install the plunger being careful not to damage the seal.  You should be 

able to feel slot/tang engagement with slight rotation of the handle.   Once 

positively engaged ensure the knurled nut is fully down.  Press downwards on 

the handle and check for proper rotation in each direction.



There is the possibility that the slot/tang engagement is perfectly OK but 

does not operate properly due to the knurled nut being too loose.  Check 

that out first.



Walt



--

wlannon(at)shaw.ca
Guest

Posted: Thu Jul 18, 2019 8:52 pm Post subject: Yak 52 Primer issue

If you cannot get to the center position remove the plunger where it is. 

The object is to ensure the the slot & tang are properly engaged throughout 

the

required travel.



Walt

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