I bought a 2003 Discovery 2 with a blown head gasket. The gasket blew out of the two inside cylinders on the right bank outward toward the exhaust manifold.
When I pulled the head, all 5 of the head bolts inside the valve cover required a 3 foot breaker bar and serious muscle to break loose. All 5 of the head bolts outside the valve cover (the ones above the exhaust manifold) were removed with a 3/8 ratchet with no breaker bar, and just a small push.
Has anyone ever seen head bolts loosen themselves on this engine? Or did the overheated engine put enough stress on the bolts to stretch them? Or did the previous mechanic forget to torque the bolts?
The blown head gasket was a composite, so I assume it has been fixed once before. Also, the head is clearly warped at almost .004" out of straight.
Thanks,
Keen
When I pulled the head, all 5 of the head bolts inside the valve cover required a 3 foot breaker bar and serious muscle to break loose. All 5 of the head bolts outside the valve cover (the ones above the exhaust manifold) were removed with a 3/8 ratchet with no breaker bar, and just a small push.
Has anyone ever seen head bolts loosen themselves on this engine? Or did the overheated engine put enough stress on the bolts to stretch them? Or did the previous mechanic forget to torque the bolts?
The blown head gasket was a composite, so I assume it has been fixed once before. Also, the head is clearly warped at almost .004" out of straight.
Thanks,
Keen
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