---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Mon 02/13/12: 9 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:11 AM - Leaky Oil Sump Valve and Rocker Bolt Leaks (PSalter@aol.com) 2. 06:32 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (A. Dennis Savarese) 3. 06:41 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (Bradly Banks) 4. 07:10 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (Roger Kemp MD) 5. 09:50 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (doug sapp) 6. 11:11 AM - Re: Leaky Oil Sump Valve and Rocker Bolt Leaks (Tom Elliott) 7. 06:24 PM - Leaky rocker arm washers (Cpayne) 8. 08:14 PM - Re: Leaky rocker arm washers (Roger Kemp M.D.) 9. 09:59 PM - Nanchang MAUW (Jay McIntyre) ________________________________ Message 1 _____________________________________ Time: 06:11:01 AM PST US From: PSalter@aol.com Subject: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks Does anyone know of a repair, as in seals or modifications, to stop oil dripping from my sump drain valve? What is the process for stopping leaks around the bolt head and nut of the rockers? I have in the past, pushed the bolt out with something close to the same size as the bolt, to replace crush washers. Is there a simple solution? Thanks Phil ________________________________ Message 2 _____________________________________ Time: 06:32:25 AM PST US From: "A. Dennis Savarese" Subject: Re: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks Phil, Remove the sump drain valve during your next oil change and chip detector screen check. Disassemble the sump drain valve and hand polish the rotating portion of valve and the seat with 320-400 grit wet/dry sandpaper. Then coat the rotating section with "fuel lube". It can be purchased from Aircraft Spruce. http://www.aircraftspruce.com/catalog/cspages/ezturnlube.php Fuel Lube is a paste like material that is unaffected by fuel and oil. THEN purchase a rubber cork from your local hardware store and plug the opening in the valve. The only solution that I know of for the leaks around the rocker arm bolts is replacing the crush washers. Do check how tight the castellated nuts are though. If they are loose, you can re tighten them and see if that helps stop the leaks. Otherwise you'll just have to replace the crush washers. Dennis A. Dennis Savarese 334-285-6263 334-546-8182 (cell) Skype: Yakguy1 www.yak-52.com On 2/13/2012 8:08 AM, PSalter@aol.com wrote: > Does anyone know of a repair, as in seals or modifications, to stop > oil dripping from my sump drain valve? > What is the process for stopping leaks around the bolt head and nut of > the rockers? I have in the past, pushed the bolt out with something > close to the same size as the bolt, to replace crush washers. Is there > a simple solution? > Thanks > Phil > * > > > * ________________________________ Message 3 _____________________________________ Time: 06:41:43 AM PST US From: "Bradly Banks" Subject: RE: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks Some commercial Hydraulic companies sell what is called a =93Dowty washer=94 it=92s a washer with a rubber seal moulded on to it and ranges from =BC=94 right up to 2=94. Its commonly used where a limited amount of torque is permissible on the fitting you are fastening. Here is a link=85 http://www.google.co.za/imgres?imgurl=http://www.speedflowshop.co.uk/ek mps/s hops/speedflow/images/513_08.07.jpg &imgrefurl=http://www.speedflowshop.co.uk/-4-dowty-seal-513-04-384-p.as p&h=3 42&w=336&sz=14&tbnid=pxF2esrnymfQ6M:&tbnh=90&tbnw=88&prev=/se arch%3Fq%3Ddowt y%2Bwasher%26tbm%3Disch%26tbo%3Du&zoom=1&q=dowty+washer&docid=6hZ7O 9sFvwT0LM &hl=en&sa=X&ei=pSA5T7nHI-WR0AWthrXBAg&sqi=2&ved=0CD0Q9QEwAw&dur =46 hope this helps Brad From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of PSalter@aol.com Sent: 13 February 2012 04:09 PM Subject: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks Does anyone know of a repair, as in seals or modifications, to stop oil dripping from my sump drain valve? What is the process for stopping leaks around the bolt head and nut of the rockers? I have in the past, pushed the bolt out with something close to the same size as the bolt, to replace crush washers. Is there a simple solution? Thanks Phil ________________________________ Message 4 _____________________________________ Time: 07:10:32 AM PST US From: "Roger Kemp MD" Subject: RE: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks Doug Sapp and George Coy can supply the crush washers. There is a trick there though. There is one washer that sits in the recess of the rocker box that is the same thickness as the crush washer under the nut head of the rocker axle (bolt) and the conciliated nut. It is roughly half the diameter of the outer crush washer. Both have to be replaced to stop the leak. The Dowty Washer will work for a while but you are not repairing the worn inner washer that is allowing some wobble of the rocker arm itself leading to the pesky leak. It takes two of each size washer. The inner washer is pressed lightly in so you will have to drive it out gently. It is easy to remove. I have a rocker arm bolt I am going to have to replace due to the worn inner washer on the engine I am rebuilding. As Dennis says, polishing the stop cock on the sump drain will help. Have seen him do it a number of times with great results. Need to do it on my 52 but time is the rate critical step at this time. I can live with it for now. Sorry don=92t have my parts manual near so can=92t give you the parts numbers for the two washers as they pertain to the M-14. Doc From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of Bradly Banks Sent: Monday, February 13, 2012 8:41 AM Subject: RE: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks Some commercial Hydraulic companies sell what is called a =93Dowty washer=94 it=92s a washer with a rubber seal moulded on to it and ranges from =BC=94 right up to 2=94. Its commonly used where a limited amount of torque is permissible on the fitting you are fastening. Here is a link=85 http://www.google.co.za/imgres?imgurl=http://www.speedflowshop.co.uk/ek mps/s hops/speedflow/images/513_08.07.jpg &imgrefurl=http://www.speedflowshop.co.uk/-4-dowty-seal-513-04-384-p.as p&h=3 42&w=336&sz=14&tbnid=pxF2esrnymfQ6M:&tbnh=90&tbnw=88&prev=/se arch%3Fq%3Ddowt y%2Bwasher%26tbm%3Disch%26tbo%3Du&zoom=1&q=dowty+washer&docid=6hZ7O 9sFvwT0LM &hl=en&sa=X&ei=pSA5T7nHI-WR0AWthrXBAg&sqi=2&ved=0CD0Q9QEwAw&dur =46 hope this helps Brad From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of PSalter@aol.com Sent: 13 February 2012 04:09 PM Subject: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks Does anyone know of a repair, as in seals or modifications, to stop oil dripping from my sump drain valve? What is the process for stopping leaks around the bolt head and nut of the rockers? I have in the past, pushed the bolt out with something close to the same size as the bolt, to replace crush washers. Is there a simple solution? Thanks Phil http://www.matronics.com/Navigator?Yak-List http://forums.matronics.com http://www.matronics.com/contribution ________________________________ Message 5 _____________________________________ Time: 09:50:18 AM PST US Subject: Re: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks From: doug sapp Phil, We carry the rocker washers in stock. Ours are .003 thicker than stock which adds a little bit more material to help out with a persistent leak. Great care should be taken to make 100% sure that all of the needle bearings are in fact present and accounted for. I have seen several engines with missing roller bearings which will in time result in abnormal wear and render the cylinder unserviceable. For those of you who have pushed out the bolt only to hear the sound of scattering bearings there are 56 of the little rascals in each bearing point. Best, Doug On Mon, Feb 13, 2012 at 6:08 AM, wrote: > ** > Does anyone know of a repair, as in seals or modifications, to stop oil > dripping from my sump drain valve? > > What is the process for stopping leaks around the bolt head and nut of the > rockers? I have in the past, pushed the bolt out with something close to > the same size as the bolt, to replace crush washers. Is there a simple > solution? > > Thanks > > Phil > > * > > * > > ________________________________ Message 6 _____________________________________ Time: 11:11:19 AM PST US From: "Tom Elliott" Subject: RE: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks To be sure of NOT hearing the tinkles of bearings. Get a bolt or rod of the same diameter as the rocker bolt and and cut it to slightly shorter than the rocker arm, chamfer the ends. As you with draw the rocker bolt insert the tool this will keep the little (x#% *&(&^) bearings in place as you remove the rocker arm. Tom Elliott CJ-6A NX63727 777 Quartz Ave PMB 7004 Sandy Valley NV 89019 Cell 702-595-2680 From: owner-yak-list-server@matronics.com [mailto:owner-yak-list-server@matronics.com] On Behalf Of doug sapp Sent: Monday, February 13, 2012 9:48 AM Subject: Re: Yak-List: Leaky Oil Sump Valve and Rocker Bolt Leaks Phil, We carry the rocker washers in stock. Ours are .003 thicker than stock which adds a little bit more material to help out with a persistent leak. Great care should be taken to make 100% sure that all of the needle bearings are in fact present and accounted for. I have seen several engines with missing roller bearings which will in time result in abnormal wear and render the cylinder unserviceable. For those of you who have pushed out the bolt only to hear the sound of scattering bearings there are 56 of the little rascals in each bearing point. Best, Doug On Mon, Feb 13, 2012 at 6:08 AM, wrote: Does anyone know of a repair, as in seals or modifications, to stop oil dripping from my sump drain valve? What is the process for stopping leaks around the bolt head and nut of the rockers? I have in the past, pushed the bolt out with something close to the same size as the bolt, to replace crush washers. Is there a simple solution? Thanks Phil et="_blank">http://www.matronics.com/Navigator?Yak-List tp://forums.matronics.com _blank">http://www.matronics.com/contribution No virus found in this message. Checked by AVG - www.avg.com ________________________________ Message 7 _____________________________________ Time: 06:24:41 PM PST US From: Cpayne Subject: Yak-List: Leaky rocker arm washers I use a orange silicone O-ring in place of the outer crush washers. 13.5mm if I remember. Has been working fine but be sure the durometer rating of the material is not too soft and the temp rating is at least 350 degrees F. Also use the chamfered rod tool to keep them pesky bearings from getting out. Craig Payne ________________________________ Message 8 _____________________________________ Time: 08:14:54 PM PST US Subject: Re: Yak-List: Leaky rocker arm washers From: "Roger Kemp M.D." Just wait until you have to pull all 18 of those buggers to r&r the cylinders. Got some tricks for chasing down those pesky 56 roller bearings when they escape. Just work over a drop cloth and have a good magnet near by because some will get away. Make sure you plug the valve guide hole if you are going to pull the rocker assembly. They will get away on some occasion. Best to make sure their walk about is a short distance and not down some deep dark tube that you are going to have to pull to trap the wandering bugger with a magnet off the top of the tappet. Now the tappet assembly is an interesting little affair all to itself. It too can take a walk about. Grease works wonders in helping those little buggers behave. Doc Sent from my iPad On Feb 13, 2012, at 8:23 PM, Cpayne wrote: > > I use a orange silicone O-ring in place of the outer crush washers. 13.5mm if I remember. Has been working fine but be sure the durometer rating of the material is not too soft and the temp rating is at least 350 degrees F. > > Also use the chamfered rod tool to keep them pesky bearings from getting out. > > Craig Payne > > > > ________________________________ Message 9 _____________________________________ Time: 09:59:13 PM PST US Subject: Yak-List: Nanchang MAUW From: Jay McIntyre Hi all... anyone no of an official MAUW for the Nanchang? The reason I ask is that we have just installed the 120 litre bladder tanks and with 2 people, 240 litres of fuel and, say, 20kg of bags we come out at about 1530 kg (3366 lb) When the first CJ came into New Zealand they were unable to find a published MAUW and chose 1400 kg as this was the cut-off point for the cheapest landing fees and so forth... nothing to do with the aircraft so to speak! Incidentally, to flog a dead horse, after revising the fuel vent system as per the instructions (inclulding new vent lines from the tanks) and alternating the collector tank flapper valves from one side to the other, the blasted thing still feeds from the LH tank first! Must be the rigging/balance! Cheers, Jay New Zealand ------------------------------------------------------------------------------------- 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.