Originally Posted by
alexdc
The torque figure at the beginning of this thread are too high. I wasted my money on a torque wrench and I broke a bolt.
Originally Posted by
dedwards0323
During re-assembly of breather cover I checked for valve cover bolt torque setting and found 10 N-m (7-8 Ft-lbs) on the service manual disc I've got. After I tightened the 2 bolts that pass thru the breather cover, I checked the remaining valve cover bolts. Found all of them less than 10 N-m. Re-tightened these bolts also. Then I tightened the 2 small hex head machine screws in the breather cover to 5-6 N-m (slightly over snug).
The torque values listed above are the recommended values for the crankcase breather covers (5-6 N-m) and the valve covers (10 N-m). The 5-6 N-m would equate to 44-53 in-lbs. So the 48 in-lbs you used should have been good. Possibility of weak material, inaccurate torque wrench, or any other factor. I took the extra precaution and instead of using NEW aluminum screws (and the small aluminum screws are a 1x use only), I used corrosion-coated (marine grade) steel screws. Achieving the recommended assembly torque was no issue.
Glad everything turned out okay for you. (Note: I switched to the corrosion-coated, steel screws after I sheared the head off a new aluminum screw! Been There; Done That!)