---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Tue 04/14/15: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:43 AM - Re: DIFFICULT START -52 (A. Dennis Savarese) 2. 07:00 AM - Re: DIFFICULT START -52 (Pedro Cerveira Pinto) 3. 08:59 AM - Re: Re: Air Leak Advice (Bitterlich, Mark G CIV NAVAIR, WD) 4. 10:19 AM - Re: Air Leak Advice (AcroGimp) 5. 05:45 PM - Re: DIFFICULT START -52 (Roger Kemp) 6. 05:54 PM - Re: Propeller Overhaul in Canada (Elmar & Manuela) ________________________________ Message 1 _____________________________________ Time: 06:43:00 AM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: 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: > > 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 > > -----Original Message----- From: Bill1200 > Sent: Monday, April 13, 2015 11:47 AM > To: yak-list@matronics.com > Subject: Yak-List: 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? > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=440793#440793 > > ________________________________ Message 2 _____________________________________ Time: 07:00:02 AM PST US Subject: Re: Yak-List: DIFFICULT START -52 From: Pedro Cerveira Pinto 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@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: > >> >> 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 >> >> -----Original Message----- From: Bill1200 >> Sent: Monday, April 13, 2015 11:47 AM >> To: yak-list@matronics.com >> Subject: Yak-List: 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? >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=440793#440793 >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> > > -- Pedro Cerveira Pinto ________________________________ Message 3 _____________________________________ Time: 08:59:36 AM PST US From: "Bitterlich, Mark G CIV NAVAIR, WD" Subject: RE: Yak-List: Re: Air Leak Advice Roger that. !! -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of AcroGimp Sent: Monday, April 13, 2015 11:38 PM Subject: Yak-List: Re: Air Leak Advice Thanks again Mark. My mechanic is quite versed in the Yak, the confusion is me a new operator. Taking your advice today I merely set UP on the handle and left it during my formation sortie, it pumped up to 50 and regulated just fine (I didn't time it and it was a long flight but I noticed it was at 50 during maybe 2nd ops check so about 20-30 minutes in) - I figure there probably was a leak with the check valve to snot valve (with compressor going) and I was impatient last time I flew. Thanks all for the inputs. I am sure there will be other things but I think this issue may be closed. 'Gimp -------- Owner/Pilot N6209F 1987 Yak-52 COMM/ASEL/IFR/HP-Complex/TW Read this topic online here: http://forums.matronics.com/viewtopic.php?p=440827#440827 ________________________________ Message 4 _____________________________________ Time: 10:19:17 AM PST US Subject: Yak-List: Re: Air Leak Advice From: "AcroGimp" mark.bitterlich(at)navy.m wrote: > Roger that. !! > > -- It was the 'chasing ghosts' comment Mark - perfectly stated and well-timed. The plane is still new enough to me that I am still figuring out what 'normal' really is and I was paranoid about air system issues since I got stranded away from base once before we figured out the start valve was going. Replaced that, then the check valves and now it seems to be fine but I needed to just let it operate normally and see that it would pump up OK which it did. Thanks again to you and Dennis in particular for good advice about not falling into the trap of shotgun/swaptronics type troubleshooting. I feel much better now. 'Gimp -------- Owner/Pilot N6209F 1987 Yak-52 COMM/ASEL/IFR/HP-Complex/TW Read this topic online here: http://forums.matronics.com/viewtopic.php?p=440847#440847 ________________________________ Message 5 _____________________________________ Time: 05:45:57 PM PST US Subject: Re: Yak-List: DIFFICULT START -52 From: Roger Kemp 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 > On Apr 13, 2015, at 1:47 PM, Bill1200 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 > > > > > > > > > > ________________________________ Message 6 _____________________________________ Time: 05:54:10 PM PST US From: Elmar & Manuela Subject: Yak-List: Re: Propeller Overhaul in Canada Hi Jeff, you might want to give these guys a call, they might be able to help you out having your CJ propeller overhauled within Canada. http://www.hopeaero.com/ All the best. cheers Elmar ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.