08-11-2022, 07:26 PM
I fitted D21s to the 65 engine after its rebuild and they all leaked badly. This was the first time it had happened to me so I was surprised. I replaced them with a new set and made sure the sealing surfaces were absolutely clean and no problems since. I think today's plugs are just not made as well as they once were. I suspect my leaks were down to insufficient torque and less than perfectly clean sealing surfaces.
The Champion website recommends:
Torque - new plugs 35 ft/lbs
Reinstalled plugs - finger tight plus 90°
The Champion website recommends:
Torque - new plugs 35 ft/lbs
Reinstalled plugs - finger tight plus 90°