Help to verify piston and rod part numbers please

[Charrie 22]

I bought a piston with rings kit and a connecting rod for my 416-8 which has the K341s 71371 engine. 

 

The connecting rod is where my confusion comes in. The box part number is "45 067 23" . That part number corresponds to a rod being .010 under to fit a turned down crankshaft, which is what I wanted. The casting though on the rod itself is "47 059 07" and when I looked that number up, it came back as a standard size replacement for a couple of different engines and then in one post the poster started that rod number is .010 under. 

 

Also as to the connecting rod it is my understanding that there is a "old" style rod and a "new" style rod, I think one being thicker then stock? The  "45 067 23" should be "old style"?

 

 

This piston is not standard but rather .010 over. 

The part number on the box for the piston and rings is "45 874 03"    Code 748, there is no S at the end.

The casting inside the piston has the numbers, 4507456 on one side and B3042 on the opposite side. On the top of the piston is stamped .01 and in a faint black ink stamp is 4507458.

 

The  rings that came with the piston is part #4510807  Looking up these rings, they are also .010 over, so all of  that should be fine I believe.

 

Thanks for your help.

 

 

 

[953 nut 69,551]

if it fits you'll be fine, remember the  oil hole on the rod cap  faces the cam. 

[ri702bill 13,092]

Methinks the Casting Number for the STD and the .010 undersize rods May be the same - just depends on the big end finished bore size?? 

[Gasaholic 393]

A lot of cast pieces will have casting part numbers that identify which mold they came from and have no relation to the finished sizes. "new style" rods as I recall have studs with bronze locator pins (compression fit) and serrated flange lock nuts in the rod cap , while old style rods were precisely located with matching "puzzle piece" indents and used fine thread bolts and hardened flat washers and lock washers through the cap and into the rod . new style came about as the old style was prone to the bolts coming loose and eventually stripping the threads under repeated thermal expansion cycles..  Much like many carburetors might share the same casting part number, but their final part number and specs will vary depending on their jetting and linkages, etc... I'd never rely on a casting part number to identify a part for a specific purpose .. Much like the K301-K321 rods which have the same stroke, they'll have the same casting part number, but the rod part number itself may vary depending on the oil dipper configuration and finished bore diameter...  

[Charrie 22]

Thanks for the replies and advice. Apparently many people must miss that part about the oil hole towards the cam. I have seen that warning in several threads.   

 Thanks for the explanation  about part number castings. I had read something about the castings and then machining the bores.  Last night I researched the piston because the one i bought does not have the wrist pin keepers with it and should have. I noticed that the keepers fit the K301, K321, and K341 pistons (according to what I found). That would lead one to believe that the wrist pin is the same size in all of those engines.   Online google search shows the wrist pins are the same. So, That would indicate that the  connecting rods could all be cast in the same mold but then machined on the crank end. (provided the stroke is the same. Anyway.

 

i didn't buy these parts to use right now but rather in the future. Old hardware shop going out of business and I spent a few hours searching his parts. 0.010 is the closest I could find. 

 

I guess I should start a new thread to keep all of my questions in one place. I bought a 1985 416-8 a few months back. I am ready to start trying to bring it back to life and will need some help. 

 

Again Thanks! I feel much better knowing they are the correct parts.