I have a 02 gtx rfi. I just rebuilt my whole engine. New crank, new bearings, new pistons with rings. Everything. It has like 30 hours so far and for some reason my oil pump came unbolted and yeah... Ran till it over heated. I think the pistons stuck a couple times after trying to get back to the ramp and when I got back it had a "knock".
When I got home I checked compression (back piston is 155psi, front is 140psi), I rotated the crank with plugs out amd could hear no scratching/grinding of metal, I put a pencil on each piston and while i rotated the crank back and forth to check for any major play in rod bearings and theres none. Then i got a strait pick and scraped the piston heads and felt no divits or signs of a burnt/melted piston.
A week later I put the pump back on and primed it and everything and ran it. I was wakeboarding behind it for probably about 30 min then rode it around the lake. The first like 15 min or riding it i kept it at half throttle and it ran good then i jumped up to full throttle and it misfired a couple times i think because plugs were oiled up. But it stoped randomly misfiring and ran like normal. No knock within the throttle range but when i drop back to idle the knock comes back.
I work at a boat dealership and asked my cousin who has worked on engines his hole life about what he thinks about the noise (he listend to the engine and the "knock" also) and he says he thinks my bottom ring burnt up and its smacking my cylinder wall.
Thats alot to read but to me every detail counts. If you guys have any thaughts on what my problem exactly is or if you want me to chec. Anything out please leave a comment.
Thanks!
When I got home I checked compression (back piston is 155psi, front is 140psi), I rotated the crank with plugs out amd could hear no scratching/grinding of metal, I put a pencil on each piston and while i rotated the crank back and forth to check for any major play in rod bearings and theres none. Then i got a strait pick and scraped the piston heads and felt no divits or signs of a burnt/melted piston.
A week later I put the pump back on and primed it and everything and ran it. I was wakeboarding behind it for probably about 30 min then rode it around the lake. The first like 15 min or riding it i kept it at half throttle and it ran good then i jumped up to full throttle and it misfired a couple times i think because plugs were oiled up. But it stoped randomly misfiring and ran like normal. No knock within the throttle range but when i drop back to idle the knock comes back.
I work at a boat dealership and asked my cousin who has worked on engines his hole life about what he thinks about the noise (he listend to the engine and the "knock" also) and he says he thinks my bottom ring burnt up and its smacking my cylinder wall.
Thats alot to read but to me every detail counts. If you guys have any thaughts on what my problem exactly is or if you want me to chec. Anything out please leave a comment.
Thanks!
