I just recieved my eagle rods yesterday and when I tried to push the wrist pins through them it was obvious that they were not going to fit. The pins fit through the piston just fine. Btw they are weisco pistons. So, i measured the inner-diameter of the rod where the pin is supposed to go through and I also measured the the outer-diameter of the pin. The hole in the rod is .002in smaller than the pin. Is this normal? I know it is supposed to be a tight fit and that some heating of the rod and freezing of the pin is necassary sometimes in order to make it fit, but it seems like .002in is a rather large difference. Any help would be greatly appreciated! TIA!

~Sean

I believe thats right. There is a tool you can get to push them in, that and heating/cooling them.

Originally posted by mpg9999
I believe thats right. There is a tool you can get to push them in, that and heating/cooling them.

Thanks for responding. Do you have any idea of the temperatures that the rods need to be heated to?

I used George's page when putting my engine together

http://home.earthlink.net/~geo3/PickingUP.htm

Ok, the clearance is -.004mm to 0 mm (-.0002 to 0 inches). Here is what the FSM says on assembling it:

1. Install new snap ring on one side of piston pin hole.
2. Heat piston to 60 to 70 C (140 to 158 F) and assemble piston, piston pin, connecting rod and new snap ring.
-Align the direction of piston and connecting rod.
-Numbers stamped on connecting rod and cap correspond to each cylinder.
-After assembly, make sure connecting rod swings smoothly.

Oh crap, I just realized your trying to fit them threw the rods, not the pistons. I cant read. I think the clearance for the rod and pin is .005-.017mm. Im not sure what to tell you. Maybe smaller bushings?

Originally posted by mpg9999
Oh crap, I just realized your trying to fit them threw the rods, not the pistons. I cant read. I think the clearance for the rod and pin is .005-.017mm. Im not sure what to tell you. Maybe smaller bushings?

Do you mean the bushing in the rods. I was thinking about possibly taking them to a machine shop and having them honed in hopes of that taking out .001in or so. When I heated, @200 deg F, the rod, and slightly cooled the pin the clearence came .001in closer. The pin still did not want to go through the rod. I have not looked in my FSM for the exact clearence numbers, but just by logic, it seems that the pin should be slightly smaller than the hole in the rod so that it is able to have some movement. Please correct me if I am wrong, and Thanks for your input.

Yeah, the pin should be slightly smaller then the rod (.005-.017mm is the clearence). The pin should however be bigger then the pin hole in the piston. Check out your FSM. There is good info in there.

Yea, it is a tight fit for the pin to fit in the piston, but it does. Thanks again for your help.

the parts you have should be full floating (eagle rods/weisco)which should gotogether by hand .If not pins will have to be fitted to rods by machine shop,pin should move easy from side to side in rod.

Heat gun worked for me with 300ztt pistons on BB rods.

Originally posted by madddjack
the parts you have should be full floating (eagle rods/weisco)which should gotogether by hand .If not pins will have to be fitted to rods by machine shop,pin should move easy from side to side in rod.

The pin fits into the piston just fine, a little assembly lube and it moves very freely. I am going to call eagle and see what they have to say. I just want to make sure they say it is ok to hone/bore the rod out a little bit.


Thanks again guys for all the help, i is much appreciated! :D

you are supposed to hone the small end!!! have you ever built an engine before? you take your rods and pins to a machine shop and they size them to the appropriate clearance.