This is the first 10 pages of the "look what I found lurking" thread...I kept the highlights that I thought were relevant
__________________________________________________ ________
Think this may of been contributing to my slow fill times.
20150224_193553.jpg
This is the 90° fitting on the belt side (back), 3rd stage connects the the horizontal Intercooler tubing to the head
Used a brass wire bore brush and cleaned it and the head out, still waiting to see if the fill times are better
_____________________
I have tried everything I can think of.
Still only getting 1.75 cfm...added the crush washer to the 3rd stage as well...sigh
I'm sure I'm missing something but not sure what it is, I have changed every valve in this thing.
This is the second stage
20150301_235904.jpg
20150301_235915.jpg
This set to the right level, not sure if this would have anything to do with it (I'm running out of ideas)
20150302_011940.jpg
Back together again...
20150302_015209.jpg
Looks like I'm getting a slight bit of interference from the valve (likely due to the washer pushing the valve out ever so slightly, I do not see any marks on the piston itself or the valve so for now nothing is actually hitting
20150302_021159.jpg
_______________________
Cleaned out the intercooler tube and it was actually pretty clean
When I am not compressing any gas and I vent the discharge to atmosphere I'm getting 3.5-3.75 cfm (normal) but as soon as it starts compressing the flow comes to a crawl exponentially (higher the discharge pressure the slower it gets)
All the valves have been replaced along with a new belt. This is a mystery.
______________________
after another chat with steve i think we have it nailed down to blow by from the 2nd and 3rd stage with the 3rd stage being the likely candidate
I also spoke with Mike Casey from Lawrence Factor, I sent him and Ray Contreras the video about the new 4th stage valve and piston assembly for the mch 30 (similar to the 3rd stage on the mch5) and am awaiting pricing and more info on a possible retrofit, the mch30 may be slightly longer and wont fit in the mch5, will update when i have more info on this
i also spoke with Carl from L&M compressors who has experience with every major compressor on the market (Bauer,Coltri, Mako, GD etc...) and he also said that this sounds like a faulty ring issue.
A few other things that i found interesting about the MCH5 is that there is a weak link in the second stage piston wrist pin. We are unsure if coltri has done what bauer has done and beefed it up by using a needle bearing in the wrist pin but its something worth looking into.
Another thing that i wanted to share was that the newer compressors use a phenolic material for the piston rings as opposed to steel or chromoly. These being much more expensive (about 20$ each ring) but have very good wear properties and they do not conduct heat, this in turn seals better and minimize heat transfer to the gas. If i can run these rings i probably will and report back.
___________________________
_________________________
Well according to Carl from L&M I was due for a ring change anyway, in any case this issue happened after the oil change and I have been running this oil for a couple of years now. IIRC the last oil change was only 25 hours overdue and there was no evidence of any kind that something was a miss (coke/slow fills) at the time I did the oil/valve change.
I believe that the recirculation of the hot gas over and over caused the coking, would another oil have prevented it I don't know. I have been running my machine pretty hard since December when I got my new truck a big contributing factor is the extended running times, in some cases 12+ hours of continuous use a day.
What I think would be a good idea is some sort of a flow regulator on the tube that leads from the crankcase to the intake that would give you a idea on how much blow by you are getting so you can see a decline in efficiency and fix it before it causes a major failure.
I'm approaching 3000 hours. still very much satisfied with this machine, it has paid for itself many times over though I think with a few tweaks it could be better.
______________________
new_kit_head_3rd_stage_mch_811131618.pdffound this E-Flyer
______________________
Here is the part number of the Lawrence Factor ring set I am using in my MCH5 compressor. NP-2211-0376A Link to site: http://www.lawrence-factor.com/Compr...=NP-2211-0376A
________________________
1st stage
NP-2211-0389A
Piston ring set. (60mm)
$45.05
2nd stage
NP-2211-0371A
Piston ring set. (36mm)
$47.40
3rd stage cost is 48$ hopefully they ship out tomorrow morning
thanks Dave
__________________________
_____________________
20150315_061345.jpg
Back a few pages I mentioned that Carl from L&M compressors told me that the weak link on the mch5 was the 2nd stage wrist pin....he wasn't kidding
Going to take another day or 2 to get to the local bearing shop for a replacement needle bearing and wrist pin, then I can replace the rings
_____________________
20150315_221507.jpg20150315_221205.jpg
More pictures of the carnage, need some help identifying the brand name of this piston I assume it's a European manufacturer
________________
__________________________________________________ ________
Think this may of been contributing to my slow fill times.
20150224_193553.jpg
This is the 90° fitting on the belt side (back), 3rd stage connects the the horizontal Intercooler tubing to the head
Used a brass wire bore brush and cleaned it and the head out, still waiting to see if the fill times are better
_____________________
I have tried everything I can think of.
Still only getting 1.75 cfm...added the crush washer to the 3rd stage as well...sigh
I'm sure I'm missing something but not sure what it is, I have changed every valve in this thing.
This is the second stage
20150301_235904.jpg
20150301_235915.jpg
This set to the right level, not sure if this would have anything to do with it (I'm running out of ideas)
20150302_011940.jpg
Back together again...
20150302_015209.jpg
Looks like I'm getting a slight bit of interference from the valve (likely due to the washer pushing the valve out ever so slightly, I do not see any marks on the piston itself or the valve so for now nothing is actually hitting
20150302_021159.jpg
_______________________
Cleaned out the intercooler tube and it was actually pretty clean
When I am not compressing any gas and I vent the discharge to atmosphere I'm getting 3.5-3.75 cfm (normal) but as soon as it starts compressing the flow comes to a crawl exponentially (higher the discharge pressure the slower it gets)
All the valves have been replaced along with a new belt. This is a mystery.
______________________
after another chat with steve i think we have it nailed down to blow by from the 2nd and 3rd stage with the 3rd stage being the likely candidate
I also spoke with Mike Casey from Lawrence Factor, I sent him and Ray Contreras the video about the new 4th stage valve and piston assembly for the mch 30 (similar to the 3rd stage on the mch5) and am awaiting pricing and more info on a possible retrofit, the mch30 may be slightly longer and wont fit in the mch5, will update when i have more info on this
i also spoke with Carl from L&M compressors who has experience with every major compressor on the market (Bauer,Coltri, Mako, GD etc...) and he also said that this sounds like a faulty ring issue.
A few other things that i found interesting about the MCH5 is that there is a weak link in the second stage piston wrist pin. We are unsure if coltri has done what bauer has done and beefed it up by using a needle bearing in the wrist pin but its something worth looking into.
Another thing that i wanted to share was that the newer compressors use a phenolic material for the piston rings as opposed to steel or chromoly. These being much more expensive (about 20$ each ring) but have very good wear properties and they do not conduct heat, this in turn seals better and minimize heat transfer to the gas. If i can run these rings i probably will and report back.
___________________________
Originally posted by cngtennessee
View Post
_________________________
Well according to Carl from L&M I was due for a ring change anyway, in any case this issue happened after the oil change and I have been running this oil for a couple of years now. IIRC the last oil change was only 25 hours overdue and there was no evidence of any kind that something was a miss (coke/slow fills) at the time I did the oil/valve change.
I believe that the recirculation of the hot gas over and over caused the coking, would another oil have prevented it I don't know. I have been running my machine pretty hard since December when I got my new truck a big contributing factor is the extended running times, in some cases 12+ hours of continuous use a day.
What I think would be a good idea is some sort of a flow regulator on the tube that leads from the crankcase to the intake that would give you a idea on how much blow by you are getting so you can see a decline in efficiency and fix it before it causes a major failure.
I'm approaching 3000 hours. still very much satisfied with this machine, it has paid for itself many times over though I think with a few tweaks it could be better.
______________________
new_kit_head_3rd_stage_mch_811131618.pdffound this E-Flyer
______________________
Here is the part number of the Lawrence Factor ring set I am using in my MCH5 compressor. NP-2211-0376A Link to site: http://www.lawrence-factor.com/Compr...=NP-2211-0376A
________________________
Originally posted by alpacafarmer
View Post
NP-2211-0389A
Piston ring set. (60mm)
$45.05
2nd stage
NP-2211-0371A
Piston ring set. (36mm)
$47.40
3rd stage cost is 48$ hopefully they ship out tomorrow morning
thanks Dave
__________________________
Originally posted by karl
View Post
20150315_061345.jpg
Back a few pages I mentioned that Carl from L&M compressors told me that the weak link on the mch5 was the 2nd stage wrist pin....he wasn't kidding
Going to take another day or 2 to get to the local bearing shop for a replacement needle bearing and wrist pin, then I can replace the rings
_____________________
20150315_221507.jpg20150315_221205.jpg
More pictures of the carnage, need some help identifying the brand name of this piston I assume it's a European manufacturer
________________
Originally posted by cngtennessee
View Post
Comment