Re: 1941 120 Head gasket Issue
Posted by Owen_Dyneto On 2010/5/10 8:26:45
I'm not familiar with the Packard8. But i am assuming as general eng'ring practice that HARDENED steel washers are used under the head stud nuts
When the old washers beneath the head nuts are questionable, I usually buy aircraft quality hardened and ground flat-and-parallel washers from a place like MSC. When installating a head other than one from the same engine (for example, a 327 head on a 359), check to insure that there is enough thread length on the stud; if the nut bottoms out before it is tight, you'll likely break the stud, usually in the block!
Cylinder heads that are out-of-plane by perhaps 0.010" or so do not require resurfacing. Even if a head has not been surfaced, check for sufficient clearance between the valve heads and the cylinder head. Follow the tightenting sequence, retorque again after 10 minutes of running, and at least one more time after a few hours of running.
The attached my be helpful.
PS - notice that leaving the thermostat housing and the heater elbow pipe on the head make handy lifting points, as in the picture.
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When the old washers beneath the head nuts are questionable, I usually buy aircraft quality hardened and ground flat-and-parallel washers from a place like MSC. When installating a head other than one from the same engine (for example, a 327 head on a 359), check to insure that there is enough thread length on the stud; if the nut bottoms out before it is tight, you'll likely break the stud, usually in the block!
Cylinder heads that are out-of-plane by perhaps 0.010" or so do not require resurfacing. Even if a head has not been surfaced, check for sufficient clearance between the valve heads and the cylinder head. Follow the tightenting sequence, retorque again after 10 minutes of running, and at least one more time after a few hours of running.
The attached my be helpful.
PS - notice that leaving the thermostat housing and the heater elbow pipe on the head make handy lifting points, as in the picture.
Attach file:
(199.74 KB)
(216.63 KB)
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