Feb 2016
Crankshaft failure
08/02/16 01:21
A most disappointing start to the day, as I had a friend come round to the house, and he asked how the engine was going, so I said, "Have a look for yourself".
he nipped into the shed, and I started it, and he was gobsmacked it sound so quiet on open pipes, and after I released the choke, I left the engine on a slow idle to warm up. After a cup of tea, we went back to the shed, and I checked the exhausts and cylinders, and started to gently open the throttle. Then I dip three short blips on the throttle, "broom, broom, broom", and on the third blip just as I let the throttle go, there was an sudden "dink".
He looked at me, I looked at him, and just said, "It's seized, most odd". That was when the engine was almost ready to go in Brian's car, and all it needed were a few detailed tweaks, a clean with strip down and a rebuild.
In a few hours the engine was stripped, the crankshaft split, and the cause inspected. It was a mystery, how could this crankshaft fail? It had only done 27 hours running, and how come the rod had friction welded itself to the crank web.
he nipped into the shed, and I started it, and he was gobsmacked it sound so quiet on open pipes, and after I released the choke, I left the engine on a slow idle to warm up. After a cup of tea, we went back to the shed, and I checked the exhausts and cylinders, and started to gently open the throttle. Then I dip three short blips on the throttle, "broom, broom, broom", and on the third blip just as I let the throttle go, there was an sudden "dink".
He looked at me, I looked at him, and just said, "It's seized, most odd". That was when the engine was almost ready to go in Brian's car, and all it needed were a few detailed tweaks, a clean with strip down and a rebuild.
In a few hours the engine was stripped, the crankshaft split, and the cause inspected. It was a mystery, how could this crankshaft fail? It had only done 27 hours running, and how come the rod had friction welded itself to the crank web.