oil pressure sending unit block and washers

[redcoupe86]

When I took the mounting block off the engine that the oil pressure sending unit attaches too it had aluminum washers on both sides. I didn't have alum. washers and I didn't want to use the old ones so I used some new coppers ones I had for the oil line bolt on the side of the engine that were the same size. I couldn't torque the bolt (with the hole that goes through the block) accurately b/c the torque wrench wouldn't fit down in there so I had to do it by feel.

Low and behold I have very small leak b/t the block and the engine. So I tryed tightening it again with a 7 or 8 inch wrench. I found I could still tighten the bolt (with the hole) some more (say 10 - 15 degrees) with just a bit of force. I didn't want to keep pressing my luck and strip the threads so I stoped there.

My question is can you use copper washers for this or do you have to use aluminum?

[john walker's workshop]

either will work fine.

[redcoupe86]

ok, good.

Do you have any recommendations on what kind of torque wrench to use to tighten the bolt, or is just snugging it up ok?