I developed a knock in the engine of my 26 touring which I rebuilt about eight years ago with aluminum pistons. I pulled the head and the inspection cover to remove the Pistons and discovered on the number one cylinder the wrist pin was seized in the piston. Had to beat it out with a hammer. The other three Pistons were fine. Does anyone have any idea What caused this? It is a new one on me
Lack of oil maybe or the wrist pin was too tight to start with.
Did it have the oil hole drilled in the piston?
I've had seized wrist pins in 2 engines, both on new aluminium pistons after several thousand miles. I have one apart right now, should I drill an oil hole?
Oh, BTW, I checked they moved freely before assembly.
Yes, half way along and through the bottom and top of the boss, about 1/8" drill bit.
I have found that on al piston. I think that the clearance is too close on the pins. I hone them so that they move free. Dan.
Piston did have oil holes
and the other three Pistons are fine I never would’ve installed it had it been tight it is puzzling
Agree with Dan