3.9 v8 loose head bolts

[harry]

pulled the heads off a 3.9 today,
several head bolts , the outer ones beside the exhaust ports, were basically finger tight,
of the inner bolts, many only needed a light pull to undo them and only two really needed a lot of force to undo them, but still not what i thought was correct torque.

has anyone had experience of loose head bolts on a 3.9?

i should add that this engine was repaired due overheating, sort of recently, and has had overheating issues ever since.

the repairer shall remain nameless, as i don't do that to people, but i suspect that the heads may have been torqued to the 20 nm, but they missed the 180deg last step.

[CheekyD1]

What does the manual say about replacing the head bolts every time the head is removed

maybe that is why so many are coming loose

[DRanged]

pulled the heads off a 3.9 today,
several head bolts , the outer ones beside the exhaust ports, were basically finger tight,
of the inner bolts, many only needed a light pull to undo them and only two really needed a lot of force to undo them, but still not what i thought was correct torque.

has anyone had experience of loose head bolts on a 3.9?

i should add that this engine was repaired due overheating, sort of recently, and has had overheating issues ever since.

the repairer shall remain nameless, as i don't do that to people, but i suspect that the heads may have been torqued to the 20 nm, but they missed the 180deg last step.

Harry
regardless of what w/shop manuals say ,I always use new head bolts. Eliminates any potential problems.

Justin

[Presto]

I thought they were designed for one use. They stretch when you torque them up don't they?

[Psimpson7]

I would use either new bolts every time or just swap out to the ARP studs.

When I end up pulling the heads on our D2 I already have the ARP set ready to go.