Re: Force 90 piston removal
Those are 12 point 1/4 inch heads capscrews. To remove you go to Sears or another tool seller and buy a 1/4 inch drive, 1/4 inch 12 point socket. Using a 1/4 inch extender bar, reach in and remove both bolts. It goes easier if you use a 3/8 driver and 3/8 to 1/4 adapter.
Rod caps are "cracked cap" type and must go back on the respective rods in the respective orientation. The rods are fully machined and hardened. Then the cap is broken off, leaving a rough break. Thus, you can not reverse the cap on the rod or switch caps to different rods.
When reassembling, you MUST use a torque wrench. First tighten the bolts hand tight and be certain the caps are located properly. There is a flat or two ground onto the outside of the rod and a sharp object must pass over the crack on this flat without skipping or catching. This ensures that the inside of the rod is smooth and the rollers will not bounce over a ridge created by an incorrectly aligned cap. Again, account for all 16 rollers.
When the cap is correctly aligned, tighten the capscrews to 190 INCH pounds.
Note the orientation of the rod. One side has a Vee and the other has a flat notch. One of them (I forget which now) goes UP un the cylinder. It is not critical, I have done it either way with good results, but the factory did it one way so there must be a reason.
