- Location
- Denver, ColoRADo
Zach if you could give me a call. I would like to send the cylinders back to you. Just need to know time and cost. They are the two things I am running out of quickly
Super Jet Am I Boned? How did this happen.
- Thread starter CBiDrive
- Start date
N3vrSat1sfied
Military Member
- Location
- Fort Worth, TX
to the op, the Pin they are referencing is a very small pin on the piston itself. The pin must go in the ring gap, to keep them from spinning or your case pushing the ring out and causing damage.
- Location
- Denver, ColoRADo
I did. The instructions with the pistons put the end gaps in a different location and never mentions the alignment pins. I thought they were to lock rings in place. MY bad and I paid the price. I expected to make some mistakes on this build this one is just hard to swallow
N3vrSat1sfied
Military Member
- Location
- Fort Worth, TX
I was thinking the same thing, But dont beat yourself up OP, everyone makes mistakes. Live and learn. First 2stroke rebuild I did, I had a c clip let go. Fortunately it only smoked the top end.
- Location
- Amherst NH
Yeah , not trying to beat you up , Ive made my share of mistakes. Just was wondering how you get them in the hole under such tight tollerance if they werent alligned.
If it was me I'd take my hone and very lightly hit the cylinder to see how bad the damage was.
If it was me I'd take my hone and very lightly hit the cylinder to see how bad the damage was.
- Location
- Cruising Around
My question is this. If you say you followed the instructions (which I believe) were the piston instructions not in your possession/provided (every piston I've bought has the intsructions explaining this)? They usually explain ring gap and you had no idea what other posters meant by that term? Good luck next time, and we have all cost ourselves money at one point. Learning costs money unfortunately, but if you weren't provided the info ya paid for, well then.
Last edited:
Quinc
Buy a Superjet
- Location
- California
I want to say my pistons or the rings instructions said to have the ring gaps @ 180 degree's of each other, but of course the pins on the pistons would not allow that.
- Location
- Denver, ColoRADo
I know what the ring gap is and to check it on a used piston. My instructions said to put ring gaps at 180deg lined up with wrist pin with no mention of alignment pins. First motor build so I didn't know anything about them. The cylinders will be on their way back to PHP tomorrow and just have to chalk it up to lesson learned. I do aircraft motors and have never seen anything like that and I live by the intructions and maintenance manuals given. We do have a lot tighter tolerances on our ski motors than say an horizontally opposed aircraft motor. Turbines different story.
Believe me everything will get measured this time
Last edited:
Quinc
Buy a Superjet
- Location
- California
Like what @ WB1994 has been saying, it doesn't make since that you would be able to put the pistons into the cylinders without the rings being lined up. so maybe they where upside down?
Fro Diesel
creative control
- Location
- Kzoo
Ah....this is why I dont fly.
- Location
- Denver, ColoRADo
Nope. Just kept tightening ring compressor until they went in when I turned the motor by hand it didn't feel like too much resistance. It was just one of those things that you don't know till you know. First experience with a 2 stroke ever and should have inquired on here on why the rings didn't seem to seat in the grooves right. Talked to Zack at PHP and he broke it all down for me on what happened. I will be writing to Pro-tec with a copy of the instructions so maybe this does not happen to someone in the future. Havn't had a plane go down yet so hopefully I'm doing things right on that front.
I've done it before. But the second you try to turn the motor by hand, you know something is wrong because the cylinder won't move beyond bdc
sent from the lake.
- Location
- the jetski grave yard
ring compressor? never used one on anything but car motors. compress one ring set at a time and slide the cyl on one at a time. sometimes the ring twists and the pin isnt lined up and you instantly know it when it doesnt just fall together. you need to use your hands as sensors. if it doesnt just fall together and you have to force anything, it isnt right.
- Location
- Denver, ColoRADo
That would have been good to know
.. Now I do. Cant believe how fast this got diagnosed on here. I will definitely be asking if something doesn't seem right from now on.
.. Now I do. Cant believe how fast this got diagnosed on here. I will definitely be asking if something doesn't seem right from now on.
N3vrSat1sfied
Military Member
- Location
- Fort Worth, TX
ya you dont need a ring compressor on these, just squeeze the rings in place with your hands.
- Location
- Denver, ColoRADo
Try getting a 5in piston in a Lycoming O-540 without one. It never even crossed my mind to do it by hand.
- Location
- Fort Worth
dont worry about where the ring gaps are supposed to be on the cylinders. as long as the arrow on the pistons point to the exhaust side, THAT is where your ring gap is supposed to be. then line up the rings so the gap fits in the ring stops. (wsm pistons) but im pretty sure wiseco and pro-x are the same way. thats so the rings gaps dont get caught in the exhaust ports.