Quote:
Originally Posted by Azathoth
I have seen a couple of gearboxes where the owner used the chomo-moly gear grease on the piston rails and piston head.
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threadjack; I've seen someone pour 5W-30 into a mechbox lol
You may need to physically modify your mechbox, or buy a new piston.
Many times I've seen aftermarket pistons get jammed in mechboxes simply due to tolerances. If you want to keep the piston, it's possible you might have to chisel down the piston rails to get more clearance