Show Posts
1
Petteroids / Re: A Petteroid that fires once.
« on: August 08, 2007, 07:14:47 PM »Hi everyone...I know I'm late but things don't always go to where you want...
I removed the head, exposed the piston and rings, and removed the rings. No ring was already broken but the upper three were so fixed to the piston by carbon so that I broke them to get them out. They have upper and lower lips that are razor-sharp. It was obvious they were cooked by the overheatings. I cleaned their canals from carbon and new rings were easily seated. A new indian set of five 102mm rings retails for $6 (six Dollars).
Please,buy the best quality always!you must select the best ring sets I think.
The cylinder grooves were inspected by three mechanics who gave different opinions; one said it'll work fine, another said it needs polishing/smoothing but not reboring, the last decided I should throw it in the trash and a get a new one.
before doing any jobs please check the clearance of the rings while they are in new liner.it must be at least 0.25 MM .
The variability of opinion reassured me I can test my cylinder with the new rings and see what I'll decide later accordingly.
Just for your interest, a new piston complete with rings retails for around $16, a cylinder alone costs ~$24, while a new combination of cylinder, piston, and rings retail for around $40.
it is fine!
I reassembled the machine using the cylinder without polishing and everything is fine now.
Dear mkdutchman, the thread was quite helpful..thank you.
As I promised you biobill, I'll tell you what I've done to diminish sound. First i got a heavy, and heavy duty, muffler to replace the original. As it was heavy, and as the machine is not solidly fixed to the concrete base, the free vibration cracked the muffler neck several times at the end near the engine. This needed painstaking effort to support the muffler to this shapeless engine. It is still very liable to be broken again.
After deciding the solid mount is somewhat advantageous over the resilient mount, I fixed the engine directly to the concrete base, but this caused an earthquake in my house and the neighbours, so I suspended the engine on rubber pads to absorb the huge vibrations.
The muffler could not diminish but a share of the huge engine noise of a wall surrounded engine, so I had to build a sealed cabin that is fan ventilated. The fan forces air through an opening in the roof over the gen-head and the hot air should go under pressure through another roof opening over the engine that also outs the muffler outlet. The engine takes its combustion air separately through a hose to the outside. The arrangement worked fine before the summer became hell hot. It considerably attenuated noise. I used blocks of pressed wood fibre for the walls of the cabin.
Thank you all guys...
Dr. Muqdad.
