Replace head & cylinder bolts?
#1
Replace head & cylinder bolts?
I'm doing my first cylinder & head replacement on a 2011 Sportsman 500 HO.
Torque procedures would indicate these are stretch bolts which are usually discarded after being used once. I don't see any specific information regarding head and cylinder bolt replacement. Can you clarify?
Torque procedures would indicate these are stretch bolts which are usually discarded after being used once. I don't see any specific information regarding head and cylinder bolt replacement. Can you clarify?
#3
Yes the torque specs are meant for seating the head and base gaskets properly along with compensating for any head bolt stretch.Manual says to replace all 4 head bolts if you notice any thread damage or bolt stretch marks. Don't think I've ever had to replace the head bolts for these two reasons.Maybe I was lucky, but I just reused them and never had a come back for leaking,blown head gasket,etc.Torque specs are very critical.. From the manual:
Coat the threads of the 4 bolts and two small bolts with oil.
a. Tighten to 30 Nm (22 ft.-lb.).
b. Tighten to 70 Nm (51 It .-lb.).
c. Loosen each of the four bolts exactly 180'
( 1/2 turn).
d. Loosen each of the four bolts again exactly
180' ( 1/2 turn) .
e. Tighten to 15 Nm ( 11 ft.-lb.).
f. Tighten each of the four bolts exactly 90' (1/4
turn).
g. Finally, tighten each of the four bolts exactly
90' (1/4 turn) more.
9. Tighten the two small 6 mm bolts (8, Figure
to 8 Nm (71 inch pounds)
Coat the threads of the 4 bolts and two small bolts with oil.
a. Tighten to 30 Nm (22 ft.-lb.).
b. Tighten to 70 Nm (51 It .-lb.).
c. Loosen each of the four bolts exactly 180'
( 1/2 turn).
d. Loosen each of the four bolts again exactly
180' ( 1/2 turn) .
e. Tighten to 15 Nm ( 11 ft.-lb.).
f. Tighten each of the four bolts exactly 90' (1/4
turn).
g. Finally, tighten each of the four bolts exactly
90' (1/4 turn) more.
9. Tighten the two small 6 mm bolts (8, Figure
to 8 Nm (71 inch pounds)
#4