---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Wed 04/03/19: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:31 AM - Re: Engine Vibration (Penco) 2. 12:18 PM - Re: Re: Engine Vibration (A. Dennis Savarese) 3. 03:01 PM - Re: Re: Engine Vibration (George Coy) 4. 03:16 PM - Re: Re: Engine Vibration (A. Dennis Savarese) 5. 09:42 PM - Re: Re: Engine Vibration (Walter Lannon) ________________________________ Message 1 _____________________________________ Time: 11:31:08 AM PST US Subject: Yak-List: Re: Engine Vibration From: "Penco" Hey guys, update on the thing. It turned out that (pardon me for the lack of technical terms) the screw on top of the intake valve of cylindre 9 was completely loose. Preventing it from firing. After retightening and checking the spacing of the valve, everything runs smooth again. It got me a little flabergasted, I have NO IDEA how that thing came loose. The more you know... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488484#488484 ________________________________ Message 2 _____________________________________ Time: 12:18:18 PM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: Re: Engine Vibration There are 4 cam lobes on the intake cam plate and 4 lobes on the exhaust c am plate.=C2- You will need to adjust the valve 4 times because each time you rotate the prop and open the same intake valve, a different cam lobe w ill open the same intake valve.Dennis On Wednesday, April 3, 2019, 2:33:12 PM EDT, Penco wrote: Hey guys, update on the thing. It turned out that (pardon me for the lack of technical terms) the screw on top of the intake valve of cylindre 9 was completely loose. Preventing it from firing. After retightening and checking the spacing of the valve, everything runs s mooth again. It got me a little flabergasted, I have NO IDEA how that thing came loose. The more you know... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488484#488484 S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 3 _____________________________________ Time: 03:01:44 PM PST US From: "George Coy" Subject: RE: Yak-List: Re: Engine Vibration Tine to check all the valve clearances. -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Penco Sent: Wednesday, April 3, 2019 2:31 PM Subject: Yak-List: Re: Engine Vibration Hey guys, update on the thing. It turned out that (pardon me for the lack of technical terms) the screw on top of the intake valve of cylindre 9 was completely loose. Preventing it from firing. After retightening and checking the spacing of the valve, everything runs smooth again. It got me a little flabergasted, I have NO IDEA how that thing came loose. The more you know... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488484#488484 ________________________________ Message 4 _____________________________________ Time: 03:16:22 PM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: Re: Engine Vibration Great minds think alike!=C2- :-)Dennis On Wednesday, April 3, 2019, 6:03:56 PM EDT, George Coy wrote: Tine to check all the valve clearances. -----Original Message----- From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Penco Sent: Wednesday, April 3, 2019 2:31 PM Subject: Yak-List: Re: Engine Vibration Hey guys, update on the thing. It turned out that (pardon me for the lack of technical terms) the screw on top of the intake valve of cylindre 9 was completely loose. Preventing it from firing. After retightening and checking the spacing of the valve, everything runs smooth again. It got me a little flabergasted, I have NO IDEA how that thing came loose. The more you know... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488484#488484 S - WIKI - - =C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin. ________________________________ Message 5 _____________________________________ Time: 09:42:17 PM PST US From: "Walter Lannon" Subject: Re: Yak-List: Re: Engine Vibration Some very good advice from Dennis and George. If you have not done this before you will find that in adjusting the EXHAUST valve clearance it is necessary to rotate the engine to open the valve enough to provide clearance for the special wrench to properly engage the nut. If adjustment is needed the process is "check, turn, loosen, return to TDC, adjust, turn, tighten, return and re-check". It is a process that requires the utmost attention to detail. Fortunately not required for the intake valve! The only engine I know of worse than this is the R1340 (Pratt & Whitney's first engine) which has a "floating" cam ring and a valve adjusting procedure from hell! Walt -----Original Message----- From: Penco Sent: Wednesday, April 03, 2019 11:30 AM Subject: Yak-List: Re: Engine Vibration Hey guys, update on the thing. It turned out that (pardon me for the lack of technical terms) the screw on top of the intake valve of cylindre 9 was completely loose. Preventing it from firing. After retightening and checking the spacing of the valve, everything runs smooth again. It got me a little flabergasted, I have NO IDEA how that thing came loose. The more you know... 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