reelfishin
Captain
- Joined
- Mar 19, 2007
- Messages
- 3,050
A buddy of mine came over today with his 1981 Evinrude 60 which he's been running for a few years now. Someone told him the starter was bad so he showed up with the motor on the boat and a brand new starter.
To make a long story short, the motor is was stuck, I pulled the head, found what looks like starter gear teeth stuck in the lower piston. The cylinder is scratched but probably fixable.
The piston is and head are hammered pretty bad.
My question is what in the motor could produce cast iron chips that resemble gear teeth?
The motor is completely apart, the lower rod is bent, the bearing is completely gone, no sign of it at all but I have these pieces that looks like gear teeth in front of the piston.
There's no other damage that I can see besides the rod, crank, piston, and head. The pieces are too big to have passed through the carb, they are perfectly flat or straight with a beveled edge on both sides. He said the motor was running fine, he pulled in after a day of fishing, shut it down at the dock, went for the truck and trailer and the motor wouldn't restart. He's also not one to run the thing very hard, so I'm a bit surprised to see something like this on his boat.
The back side of the piston is pretty well destroyed as well, I'm wondering if these pieces could have come from inside the piston casting? iron reinforcement around the wrist pin in the casting? (The rear of the piston is shattered and the wrist pin area is broken out but not detached from the rod. The rod has an obvious S bend to it where it tried to compress those chips against the head).
When I first saw them I thought maybe the big end of the rod had come apart but other than being bent it's intact. The missing rod bearing has me puzzled, there's not even metal in the motor anywhere to account for it being hammered to bits. All the debris was on top of the piston. My first thought was that the motor had swallowed something but there's no way pieces this size came though the carbs or reeds.
The pieces are dark colored cast iron, 3/4" long and tapered to form an almost exact match to the flywheel gear teeth. Each one has a broken edge on the back side, several are busted in half.
The cylinder liner edges are good, the rod is complete, the wrist pin is complete, and I see nothing else that could produce such a shape in a motor?
The edges of the ports are good etc.
Any ideas?
To make a long story short, the motor is was stuck, I pulled the head, found what looks like starter gear teeth stuck in the lower piston. The cylinder is scratched but probably fixable.
The piston is and head are hammered pretty bad.
My question is what in the motor could produce cast iron chips that resemble gear teeth?
The motor is completely apart, the lower rod is bent, the bearing is completely gone, no sign of it at all but I have these pieces that looks like gear teeth in front of the piston.
There's no other damage that I can see besides the rod, crank, piston, and head. The pieces are too big to have passed through the carb, they are perfectly flat or straight with a beveled edge on both sides. He said the motor was running fine, he pulled in after a day of fishing, shut it down at the dock, went for the truck and trailer and the motor wouldn't restart. He's also not one to run the thing very hard, so I'm a bit surprised to see something like this on his boat.
The back side of the piston is pretty well destroyed as well, I'm wondering if these pieces could have come from inside the piston casting? iron reinforcement around the wrist pin in the casting? (The rear of the piston is shattered and the wrist pin area is broken out but not detached from the rod. The rod has an obvious S bend to it where it tried to compress those chips against the head).
When I first saw them I thought maybe the big end of the rod had come apart but other than being bent it's intact. The missing rod bearing has me puzzled, there's not even metal in the motor anywhere to account for it being hammered to bits. All the debris was on top of the piston. My first thought was that the motor had swallowed something but there's no way pieces this size came though the carbs or reeds.
The pieces are dark colored cast iron, 3/4" long and tapered to form an almost exact match to the flywheel gear teeth. Each one has a broken edge on the back side, several are busted in half.
The cylinder liner edges are good, the rod is complete, the wrist pin is complete, and I see nothing else that could produce such a shape in a motor?
The edges of the ports are good etc.
Any ideas?
I really doubt you could replicate that in a million tries!