Author Topic: China clone go BOOM !!! (Read 3494 times))

cosmic · « **on:** August 18, 2018, 07:57:34 PM »

Well, all was well until 4000 psi.. The sound changed and I walked over to it and was looking at it then Bang (&^^& my pants, parts flying.) !!Anyone got parts?? Piston was a few feet away and head units were next to it...

selittle · « **Reply #1 on:** August 18, 2018, 08:02:41 PM »

What gun was this?

cosmic · « **Reply #2 on:** August 18, 2018, 08:16:29 PM »

That was what is left of my compressor.. Topping up my scba tank...

avator · « **Reply #3 on:** August 18, 2018, 08:26:25 PM »

Sorry to see this and I'm glad you weren't hurt but... I can see this happening more and more if we keep filling tanks to 4k and above with these compressors. I would absolutely stick to filling guns directly to 3k if I had one.

avator · « **Reply #4 on:** August 18, 2018, 08:29:27 PM »

Did your tank bleed all back or did you get it shut off?

oldpro · « **Reply #5 on:** August 18, 2018, 09:54:08 PM »

Couple questions. Was the oil level high in the crank case? How long was it running time wise when it let go?

cosmic · « **Reply #6 on:** August 18, 2018, 11:25:11 PM »

Just change the royal purple so oil was fine .. It was shut down at no more than 55c and allowed to cool to 20C.. Total runtime on the unit, about 50 minutes.. First time to try for 4500 psi.. The correct order of start up and shut down was always followed.. This was supposed to be a 6000 psi compressor.. No luck for me..

USAFANG6799 · « **Reply #7 on:** August 18, 2018, 11:28:46 PM »

Quote from: avator on August 18, 2018, 08:26:25 PM

Sorry to see this and I'm glad you weren't hurt but... I can see this happening more and more if we keep filling tanks to 4k and above with these compressors. I would absolutely stick to filling guns directly to 3k if I had one.

That's exactly the conclusion I'm drawing about my YH compressor. I think it's asking a lot for these compressors to fill any kind of tanks especially when you get to that 4500 limit.

Rob M · « **Reply #8 on:** August 18, 2018, 11:51:40 PM »

sounds like a high pressure leak into the low pressure cylinder .. not combustion..unless that's impossible?

rsterne · « **Reply #9 on:** August 19, 2018, 12:27:18 AM »

Quote

sounds like a high pressure leak into the low pressure cylinder

If that is possible, it could sure cause this kind of failure, IMO....

Bob

oldpro · « **Reply #10 on:** August 19, 2018, 12:35:16 AM »

I seriously doubt its a high side leak, I have two of these and when theres and issue its always the high side piston failing but what I have seen online and looking at how its built is a main bearing failure or rod failure. My guess is it was a rod failure. Because you heard a change in the machine while running Id bet the crank either waked away from the main bearing or the rod was bending then broke. These compressors are underbuilt and Id bet they were vacuum pumps or refrigeration pumps that have been converted I seriously doubt they started their lives as HP pcp pumps.

cosmic · « **Reply #11 on:** August 19, 2018, 01:16:46 AM »

I agree with Travis rod failure at the wrist pin but the connecting rod to crankshaft still intact,, Also possible bad cylinder casting..
I just don't have the bucks to repair it.. Hoping to find some parts cheap or free... Only me !!

oldpro · « **Reply #12 on:** August 19, 2018, 01:23:14 AM »

Be cheaper to buy another one

Wayne52 · « **Reply #13 on:** August 19, 2018, 01:34:51 AM »

Travis do you think y'all will be able to get the 3 stage SPA, these small compressor's aren't really cut out for filling tanks IMO. I can see doing a little at a time but extended sessions is probably what's killing them. If I ever get one of these small compressors I probably wouldn't use it for filling tanks, just guns directly.

here's a REAL compressor

hollowpoint1911 · « **Reply #14 on:** August 19, 2018, 01:56:32 AM »

Holy @$%^. I think I might pick up some dye penetrate and developer and examine my parts for signs of damage. I've done a full tear down of my YH head and Vevor head (just like this one that came apart), and while the castings were rough, they didn't appear bad but this has definitely got me spooked. Although I have spare parts, I'm not really looking to sell them off. If you wind up pulling some money together, I'm happy to help you find replacements on AliExpress though.

msurf · « **Reply #15 on:** August 19, 2018, 04:35:44 AM »

Hmmm concerning, as this looks like the same unit I have. Seems to me it was a bad cylinder casting, as a rod type failure typically has heavy scoring in the sides of the piston. Judging from the pictures, I don't see scoring, although the pics are rather blurry.
Also seems the bolts should go through the head to the case, although I question if the case would hold the torque required to keep it in place. Bad design?

Hoosier Daddy · « **Reply #16 on:** August 19, 2018, 01:10:18 PM »

Quote

Also possible bad cylinder casting..

Sure looks that way to me. The bottom of the cylinder is still bolted to the case.
I am glad you are OK!

cosmic · « **Reply #17 on:** August 19, 2018, 03:43:04 PM »

Thanks I'm good after washing my shorts !!! By the way, I changed out to the barbed fittings after chasing leak after leak.. Here is some better pics..

cosmic · « **Reply #18 on:** August 19, 2018, 03:45:16 PM »

Looks like a bad casting on the connecting rod or the low side cylinder.. Minimum I would need is a cylinder, low pressure piston, and connecting rod… Taking measurements now..

cosmic · « **Reply #19 on:** August 19, 2018, 04:34:47 PM »

piston bore about 42 mm, connecting rod from crank hole to wrist pin 73 mm , bottom of connecting rod 20mm ,wrist pin 12mm..

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China clone go BOOM !!!

Author Topic: China clone go BOOM !!! (Read 3494 times))