Question about 1997 Mitsubishi 3000GT
The following is verbatum from the mitsu engine overhaul manual... Steps 7 and 8 are a bit cryptic, but it seems like after you tighten the bolts to 20nm in the CORRECT PATTERN... you then go around tightening 1/4 turn through the pattern, then a final 1/4 turn through the pattern... do NOT tighten each bolt to 20, the 1/4 then another 1/4 before going to the next bolt, the idea is to get EVEN tightening across the head, so tighten her three times around the pattern! Now for the verbiage from Mitsu's overhaul manual...
(1) When installing the cylinder head bolts, check that the
shank length of each bolt meets the limit. If the limit is
exceeded, replace the bolt. - Limit: Max. 96.4 mm (3.79 in.)
(2) Install the washers.
(3) Apply engine oil to the bolt threads and washers.
(4) According to the tightening sequence, tighten the bolts to
75 Nm (54 ft.lbs.).
(5) Loosen the bolts completely.
(6) Torque the bolts to 20 Nm (14.5 -ft.lbs.)
(7) Tighten the bolts l/4 turns (90”) more.
(8) Tighten the bolts l/4 turns (90”) additionally.
Posted on Feb 15, 2009
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Fig. Fig. 9: Cylinder head bolt torque sequence A
Fig. Fig. 11: Cylinder head bolt torque sequence C
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Fig.: Cylinder head torque sequence - 6 -cylinder engine
Cylinder head torquing should proceed in three steps and in the
prescribed order. Tighten them first to 50-55 ft. lbs. (65-71 Nm), then
give them a second tightening to 60-65 ft. lbs. (78-84 Nm). The final
step is to 70-75 ft. lbs. (91-97 Nm), at which they should remain
Six IN V - 6V
Fig.: Cylinder head bolt torque sequence - 6 -cylinder engine
Tighten the head, according to the illustrated sequence in three progressive steps. Tighten the bolts to 50-55 ft. lbs. (68-74 Nm), then 60-65 ft. lbs. (81-88 Nm) and finally to 75 ft. lbs. (102 Nm).
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Fig. Fig. 9 Tighten the cylinder head bolts in three steps using the sequence shown-4.6L and 5.4L engines
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