Dots on the piston top versus bevel on big end
Dots on the piston top versus bevel on big end Started assembling my engine yesterday.
Found something .. odd.
There's a little dot on the pistons, that I believe notes which side of the piston should face the front of the engine.
There's also a chamfer on one side of the big-end of the rod, which I believe should be put towards the fillet on the crank.
Also on my particular engine, there's dents in the pistons where the valves have impacted.
If I assemble the engine such that the dents are towards the top edge of the pistons on both sides, and the dots are towards the front on both sides, then the chamfered edge of the big-end of the rods are not facing the fillets on the even-numbered-side. If I put the chamfers right, then the dots are facing the back of the engine and the dents are not where the valves would have hit.
This tells me that the engine was run and driven hard with half the rods backward, that half the pistons were removed from the rods and put back backwards, that not all the pistons came from the same engine, or that I'm an idiot.
Am I a moron, or should the rods be set such that the chamfers line up with the fillets (ok, so I may not be using the correct terminology)? And if the chamfers need to line up, will it create a problem that the dots are now facing the back of the engine - do I need to take those four pistons out and take them up to the machine shop to have them turned around on the rods?
Found something .. odd.
There's a little dot on the pistons, that I believe notes which side of the piston should face the front of the engine.
There's also a chamfer on one side of the big-end of the rod, which I believe should be put towards the fillet on the crank.
Also on my particular engine, there's dents in the pistons where the valves have impacted.
If I assemble the engine such that the dents are towards the top edge of the pistons on both sides, and the dots are towards the front on both sides, then the chamfered edge of the big-end of the rods are not facing the fillets on the even-numbered-side. If I put the chamfers right, then the dots are facing the back of the engine and the dents are not where the valves would have hit.
This tells me that the engine was run and driven hard with half the rods backward, that half the pistons were removed from the rods and put back backwards, that not all the pistons came from the same engine, or that I'm an idiot.
Am I a moron, or should the rods be set such that the chamfers line up with the fillets (ok, so I may not be using the correct terminology)? And if the chamfers need to line up, will it create a problem that the dots are now facing the back of the engine - do I need to take those four pistons out and take them up to the machine shop to have them turned around on the rods?
