I just got my B16 rods and CTR pistons back from the machine shop from being assembled and all but one of the pins is pushed through to an equal amount on both sides of the rod.

On one of the rods/pistons the pin is offset about 1/8th to 3/16th's of an inch. It isn't sticking outside of the piston but it still bugs me.

Is this something that I should be worried about?

 

I called the machine shop and he said it should be fine.....I hope he is an honest guy.

 

Nobody knows?

Nobody been in this situation before?

 

the wrist pin should be offset evenly on either side. most like it'll be ok. i would put that piston/rod assembly into one of the cylinder and check the piston to rod clearance. you do not need to put the rings on. just hand tighten the rod bolts, it doesn't need to be torqued. stick a feeler gauge in between the rod and the piston. while doing this you want to push the rod towards the side you are checking. you want a minimum of .050" of piston to rod clearance per side. if it has less than .050" on one side and more on the other side, then i would bring it back to them to fix. the rods may need to be narrowed if you don't have a minimum of .050" on either side.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vhd &raquo;</TD></TR><TR><TD CLASS="quote">the wrist pin should be offset evenly on either side. most like it'll be ok. i would put that piston/rod assembly into one of the cylinder and check the piston to rod clearance. you do not need to put the rings on. just hand tighten the rod bolts, it doesn't need to be torqued. stick a feeler gauge in between the rod and the piston. while doing this you want to push the rod towards the side you are checking. you want a minimum of .050" of piston to rod clearance per side. if it has less than .050" on one side and more on the other side, then i would bring it back to them to fix. the rods may need to be narrowed if you don't have a minimum of .050" on either side. </TD></TR></TABLE>

Thanks.

Rods were already milled to 18mm to accept the CTR pistons.

Pin placement is not going to have any affect on whether or not the piston and rod are centered in the bore. The only thing that could affect that is it the centerline of the crank vs. the bore center were offset which I hope isn't an issue as the cylinders are only .25mm over.

My main concern was that of offset weight which I know shouldn't be an issue and stress on one side of the piston or pin versus the other side.

 

One last bump before I call it a night.

 

Morning bump, going to be putting this thing together asap.

 

Dumb question?

Nobody has the slightest clue?

 

I had it sone to me one time by a local machine shop...I took it back to him and the took care of the offset for me...In my opinion the machinist should of took the piston/rod assy back and push the pin more closer to the center.

 

sorry about that, i was thinking of a rod offset issue when i was typing. anyways, if the wrist pin is offset more than an 1/8" to one side of the piston then the other side, then i would bring it back to them. have them press the pin back the other way so that it is more even.