Hi, I have just done spark plugs change on my FN2 type R, I brought the NGK spark plugs and NGK suggest no copper grease as they have coating, do 1/16 turn by hand then turn 1/2 to 2/3. I have also checked the torque on service mannual which is 18N/m and I have a torque wrench so I think it is a good idea to use it. So I decide to tight them a bit more than 1/2 turn with torque wrench incase I over torque it.
Those two on the 1st & 2nd cylinder(driver side) goes pretty tight after 1/2 but torque wrench didn't click so it seems okay. For the 3rd cylinder, it click just about reaching 1/2 so not too bad. Then the one on the 4th cylinder click at 1/4 turn, which is very odd. I just give it a little bit more turn (1/16-1/8) and the torque feels similar to the 1st and 2nd one so I left it. Has anyone seen this problem before and should I still turn to 1/2 turn? I check the thread on the engine and they all seems clean, the 4th cylinder has a bit more carben deposit on the piston.
I am wondering as NGK said their plugs can be tighten just by turns, if people do it without torque wrench will the pluge be damaged in this case?
Those two on the 1st & 2nd cylinder(driver side) goes pretty tight after 1/2 but torque wrench didn't click so it seems okay. For the 3rd cylinder, it click just about reaching 1/2 so not too bad. Then the one on the 4th cylinder click at 1/4 turn, which is very odd. I just give it a little bit more turn (1/16-1/8) and the torque feels similar to the 1st and 2nd one so I left it. Has anyone seen this problem before and should I still turn to 1/2 turn? I check the thread on the engine and they all seems clean, the 4th cylinder has a bit more carben deposit on the piston.
I am wondering as NGK said their plugs can be tighten just by turns, if people do it without torque wrench will the pluge be damaged in this case?