A fairley loud knock in the motor
Loud knock in the lower end? Well don't start it again! You're going to chew up the crankpin, and connecting rods. Camshaft bearings? No, doubtful. You have a Loud knock.
1.Bad oil pump.
2.Crankpin was faulty from factory. Oil hole in crankpin wasn't chamfered from the factory. (Doubtful), or surface of crankpin wasn't hardened to the proper depth. (.010)
3.The Harley crankshaft is composed of three Main pieces. Left Flywheel, Crankpin, and Right Flywheel. Looks like two narrow wheels with an axle off to one side.
At either end of the crankpin are threads. There is also a key, in a keyway, on each end. Each end of the crankpin is tapered. Each flywheel has a keyway cut into it's tapered center hole, and this fits over the key on the crankpin's tapered end.
There is a half moon looking lock device. This screws to the outside of the flywheel, and goes around the nut, that is on the threaded end of the crankpin. This locking device keeps the nut from coming loose.
Perhaps the screw backed out, and the nut is loose. (On one side, or maybe both sides. Pretty rare for both sides)
4.Oil wasn't changed at the specified interval, or the interval rate went up, due to road conditions. (Dusty roads, or sandy)
5.Oil filter wasn't changed when oil was changed.
Aug 19, 2009 |
2004 Harley Davidson FLSTC - FLSTCI...