Hi Gurus,
I have a MK20 that cycles from 100# to 135# IP. It gets back to 135 in about 3 seconds....BUT, then it will creep to as high as 160# over 30 minutes, then it stabilizes,but over 150#....I have read about the piston evolution of the MK20 series, and know that I have the brass tip piston which is known to creep, but not this badly. Prior to taking the 1st stage apart, it was 135# cycle, then creep to 150#, which is why I decided to take it apart in the first place (other than I was waiting for a chance to start working on my newer 1st's. I have serviced a MK10 and it works perfectly). I thought it might be that I disturbed the piston/seat marriage, but after cycling about 100 times, it still creeps badly. I have ordered a service kit off of the e...but I think a composite piston may be the actual issue (it only has 1 big o ring at the base of the piston, btw. Schematics show 2 bigs ......any advice on where I can procure a comp. piston? PM me if necessary. I am currently developing a relationship with a new LDS owner, so parts are more of a challenge than in the past...Thanks in advance!
I have a MK20 that cycles from 100# to 135# IP. It gets back to 135 in about 3 seconds....BUT, then it will creep to as high as 160# over 30 minutes, then it stabilizes,but over 150#....I have read about the piston evolution of the MK20 series, and know that I have the brass tip piston which is known to creep, but not this badly. Prior to taking the 1st stage apart, it was 135# cycle, then creep to 150#, which is why I decided to take it apart in the first place (other than I was waiting for a chance to start working on my newer 1st's. I have serviced a MK10 and it works perfectly). I thought it might be that I disturbed the piston/seat marriage, but after cycling about 100 times, it still creeps badly. I have ordered a service kit off of the e...but I think a composite piston may be the actual issue (it only has 1 big o ring at the base of the piston, btw. Schematics show 2 bigs ......any advice on where I can procure a comp. piston? PM me if necessary. I am currently developing a relationship with a new LDS owner, so parts are more of a challenge than in the past...Thanks in advance!