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Support Equipment For PCP/HPA/CO2 and springers ,rams => Support Equipment For PCP/HPA/CO2 => Topic started by: green on February 26, 2019, 06:11:59 PM

Title: Yong Heng oil change
Post by: green on February 26, 2019, 06:11:59 PM
I am about to change the oil after an initial run of 1/2-hour in my new Yong Heng compressor and was hoping that someone has figured out how to get all of the old oil out of the fill sight glass. I have drained it, including tilting it forward until no more drains out, but there is still oil remaining in the sight glass. Does the pump need to be tilted backwards (lifting the bottom up and back) in order to get the oil in the glass to flow back through the small channeling holes, to accomplish this?
I wanted to ask before I tried. Thanks all!
Title: Re: Yong Heng oil change
Post by: Blacktalon6 on February 26, 2019, 07:57:59 PM
That should be fine that is all I do when I change the oil. A few drops in the site glass makes it look like it is 1/2 full.
Title: Re: Yong Heng oil change
Post by: USAFANG6799 on February 27, 2019, 09:23:03 PM
I noticed the same thing on mine.
From what I understand someone suggested unscrewing the sight glass to drain the oil.
That's what I'll probably do next time I need to change the oil.
Title: Re: Yong Heng oil change
Post by: Thiel on March 12, 2019, 11:48:54 AM
you can unscrew the whole front cover but make sure, that you have a spare gasket or something to replace the original seal. you can use the same liquid sealing which is used for motor engines. i have forget the name, sorry. its not a special glue - hardware store should have it!!
there is not a lot of oil remaining but i always got a better feeling if everything inside was wiped clean!!
Title: Re: Yong Heng oil change
Post by: USAFANG6799 on March 12, 2019, 12:00:08 PM
https://www.permatex.com/products/gasketing/gasket-sealants/permatex-aviation-form-a-gasket-no-3-sealant-liquid/ (https://www.permatex.com/products/gasketing/gasket-sealants/permatex-aviation-form-a-gasket-no-3-sealant-liquid/)

This stuff?
Title: Re: Yong Heng oil change
Post by: cosmic on March 12, 2019, 01:35:56 PM
Take the cover off.. Hold the gasket in place on the cover.. You will see that the gasket is covering part of the drain hole.. I cut the gasket on mine so that I can drain it better..
Title: Re: Yong Heng oil change
Post by: USAFANG6799 on March 12, 2019, 03:10:12 PM
Take the cover off.. Hold the gasket in place on the cover.. You will see that the gasket is covering part of the drain hole.. I cut the gasket on mine so that I can drain it better..

YEA I Like!
Will check it out.
Title: Re: Yong Heng oil change
Post by: avator on March 12, 2019, 03:26:33 PM
I take the sight glass out itself. Mine was very dirty and I wanted to clean it anyhow. Much better now.
Title: Re: Yong Heng oil change
Post by: lennyk on March 12, 2019, 04:20:02 PM
dont stress it
after a few oil changes it gets better and takes longer to get dark
Title: Re: Yong Heng oil change
Post by: Rat Sniper (AKA: PaulT58) on March 12, 2019, 08:07:49 PM
This is interesting. When I drain my oil, I just let it drain till it drips, tilt it forward a bit till it just drips and then reinstall the plug. I have never seen oil let in the sight glass after it has been drained because I watch the sight glass as I slowly refill it.
Title: Re: Yong Heng oil change
Post by: green on March 12, 2019, 08:41:49 PM
This is interesting. When I drain my oil, I just let it drain till it drips, tilt it forward a bit till it just drips and then reinstall the plug. I have never seen oil let in the sight glass after it has been drained because I watch the sight glass as I slowly refill it.

Paul,
You must have received the "easy drain" model!  lol   I didn't post this question until after I couldn't get all of the old oil out of the sight glass by just tilting it, even though I had tried tilting it forward about 90-120 degrees. As USAFANG6799 mentioned that he did, I ended up clipping the gasket just slightly and now every last drop drains out without issue.
Thanks everyone that gave a suggestion in this post. You guy's are the best!
Tom
Title: Re: Yong Heng oil change
Post by: Rat Sniper (AKA: PaulT58) on March 12, 2019, 09:32:05 PM
This is interesting. When I drain my oil, I just let it drain till it drips, tilt it forward a bit till it just drips and then reinstall the plug. I have never seen oil let in the sight glass after it has been drained because I watch the sight glass as I slowly refill it.

Paul,
You must have received the "easy drain" model!  lol   I didn't post this question until after I couldn't get all of the old oil out of the sight glass by just tilting it, even though I had tried tilting it forward about 90-120 degrees. As USAFANG6799 mentioned that he did, I ended up clipping the gasket just slightly and now every last drop drains out without issue.
Thanks everyone that gave a suggestion in this post. You guy's are the best!
Tom

Hmm, I wonder now if there is something wrong with my gasket!  Oh well, it’s not leaking and it’s still working, what more can I ask for!  LOL!
Title: Re: Yong Heng oil change
Post by: avator on March 13, 2019, 07:43:59 AM
Have a look at my MKII compressor. You'll notice that the only way to drain the oil is to unscrew the sight glass and tilt the compressor. No drain screw below it.
My Vevor does have the drain screw...


Title: Re: Yong Heng oil change
Post by: UlteriorModem on March 13, 2019, 10:28:19 AM
The thing that gets me about the YH at least in recent models is the drain plug is very small. Maybe 3/16"?

The oil comes out very slowly and almost certainly leaves residue behind.

I have heard that the goofy rubber membrane gasket on the crank case cover can be a nightmare to deal with.

I think after I have like 10 or so hours on mine I might chance popping the crankcase cover off. Until then I will just do the oil change.
Title: Re: Yong Heng oil change
Post by: redtrucker610 on March 14, 2019, 10:17:18 AM
I don't have oil that stays in the sight glass when doing changes. I just keep mine tilted while doing changes. It does drain really slow. I just remove the drain bolt and go do other things while I let it drain. I have taken my cover off a couple of times so I could clean it out good. That membrane gasket does leave a small amount of oil behind when doing changes. I had it off at the last oil change because I just had changed the high side rings and wanted to make sure I had removed anything that got into the crankcase from doing the ring change.
Title: Re: Yong Heng oil change
Post by: USAFANG6799 on March 14, 2019, 10:28:27 AM
Kurt  - Was there much residue to make it worth while to take the cover off once in awhile?
Title: Re: Yong Heng oil change
Post by: truck on March 14, 2019, 12:25:26 PM
You could drain the oil then refill with new oil and run the compressor for a few minutes to mix thing up then drain again. Let it drain overnight. That should clean things out pretty well.
Title: Re: Yong Heng oil change
Post by: UlteriorModem on March 14, 2019, 12:55:37 PM
The problem is that the drain hole is so small and the flow rate so slow that any sediment or filings will settle to the bottom of the sump and lay there until the splasher kicks things up again.
Title: Re: Yong Heng oil change
Post by: USAFANG6799 on March 14, 2019, 01:57:14 PM
When I change the oil I usually remove the oil vent cap to help it drain a bit faster which I'm hoping will help with getting rid of the sediment which accumulate near the oil drain plug.
Just remember to put it back on because I'm sure it will make a mess if you run without it.
Title: Re: Yong Heng oil change
Post by: UlteriorModem on March 14, 2019, 02:25:09 PM
When I change the oil I usually remove the oil vent cap to help it drain a bit faster which I'm hoping will help with getting rid of the sediment which accumulate near the oil drain plug.
Just remember to put it back on because I'm sure it will make a mess if you run without it.

Actuallly I did this and it made little difference.

No it seems the only way to truly clean the sump is to remove the cover.
Title: Re: Yong Heng oil change
Post by: redtrucker610 on March 14, 2019, 02:54:07 PM
Kurt  - Was there much residue to make it worth while to take the cover off once in awhile?

There was just some small amount of discolored oil sitting at the bottom. Not sure if it was worth the effort. I just wanted to make sure there wasn't anything sitting in there that could cause issues, especially after the ring change. Those rings where a hassle to change.
Title: Re: Yong Heng oil change
Post by: Thiel on March 15, 2019, 06:07:18 PM
https://www.permatex.com/products/gasketing/gasket-sealants/permatex-aviation-form-a-gasket-no-3-sealant-liquid/ (https://www.permatex.com/products/gasketing/gasket-sealants/permatex-aviation-form-a-gasket-no-3-sealant-liquid/)

This stuff?

loctite 38655

but im sure that similar products for a cheaper price are available.

just in case you cant re use the chinese gasket - maybe its fine for re use.
Title: Re: Yong Heng oil change
Post by: UlteriorModem on March 15, 2019, 07:06:44 PM
That's the stuff. Works well but a little messy to work with. I sealed all the fittings on my YH with it and improved fill times. Just make real sure you don't get any into the air pathways.

If nothing else the stuff could help to hold the goofy rubber membrane crankcase 'gasket' in place when trying to put it back together. The stuff is quite tacky.

Also don't fret like I did, you can still get things back apart if needed after it cures.

Have some mineral spirits on hand for clean up. I use charcoal lighter fluid.
Title: Re: Yong Heng oil change
Post by: Insanity on March 15, 2019, 07:40:39 PM
I have used yamabond 4 and hondabond, which is as far as I can tell all the same 3M product. A thin gray silicone/RTV sealant a very thin coat goes a long way. It is a semi drying sealant that works great on motor crankcases. It seals perfectly on a clean dry surface easy to remove the part and clean the sealant off the part. For this kind of application I think it would be better for ease of servicing than the permatex black.
Title: Re: Yong Heng oil change
Post by: avator on March 15, 2019, 08:41:51 PM
Blue glue.... been using it on my dirt bikes for years.

https://www.walmart.com/ip/6-SENSOR-SAFE-BLUE-RTV-SILICONE-GASKET-MAKER-3-O/19279234?wmlspartner=wlpa&selectedSellerId=13308&adid=22222222227016953110&wl0=&wl1=g&wl2=c&wl3=51780548351&wl4=pla-83193808031&wl5=9012797&wl6=&wl7=&wl8=&wl9=pla&wl10=120814000&wl11=online&wl12=19279234&wl13=&veh=sem&gclid=EAIaIQobChMIvp-G_qiF4QIVD4_ICh0ggw0FEAQYAiABEgIVTfD_BwE (https://www.walmart.com/ip/6-SENSOR-SAFE-BLUE-RTV-SILICONE-GASKET-MAKER-3-O/19279234?wmlspartner=wlpa&selectedSellerId=13308&adid=22222222227016953110&wl0=&wl1=g&wl2=c&wl3=51780548351&wl4=pla-83193808031&wl5=9012797&wl6=&wl7=&wl8=&wl9=pla&wl10=120814000&wl11=online&wl12=19279234&wl13=&veh=sem&gclid=EAIaIQobChMIvp-G_qiF4QIVD4_ICh0ggw0FEAQYAiABEgIVTfD_BwE)