ran hot
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Freshman User
Joined: Oct 2005
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ran hot
ok heres my problem..my son was driving our 92 f150 4.9 and the radiator was leaking, him being young he kept driving it untill the head gasket blew..i put on a new head and gaskets but it is idleing very very rough and has no power...am i in for a bottom end rebuild?...or is there something else i should look for...please help
Elder User
Joined: Apr 2004
Posts: 535
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From: Tucson, AZ
Maybe the head warped so the gasket isn't sealing properly, did you check this with a straight edge and feeler gauge? Did you use a torque wrench to tighten the head bolds and in the proper order? Another possibility is when the head gasket blew coolant ate away the bearings.
Posting Guru
Joined: Sep 2004
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You have to torque them down if they are still pedastel mount aka bolt down rockers. If you torque them down and the valves are not shut, they won't be adjusted correctly. If the head was milled enough to warrant new pushrods, then the valve may be cracked open when it should be shut, possibly.
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Freshman User
Joined: Oct 2005
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motorhead, yes they are bolt down and i torqued them, would a new head be milled? i bought it from autozone , maybe its not a good one? i think my best bet is to take it back off and double check the valves being open and replace the pushrods and lifters at the same time..what would you suggest?
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Post Fiend
Joined: Jan 2004
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From: Northwest, Arkansas
Are you sure it was a brand new head from AutoZone and not a reman? If it was reman then it was probably milled.
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Posting Guru
Joined: Sep 2004
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Most parts stores only offer remanufactured heads and your right, it shouldn't be so out of spec but ya just never know. 
A handy tool to have is a compression gauge, $20 or so from you local autoparts store. Connect this to each spark plug hole, do the compression test and it will give you and idea of many things without having to pull the head.
Are you sure the timing is correct?
Good luck
A handy tool to have is a compression gauge, $20 or so from you local autoparts store. Connect this to each spark plug hole, do the compression test and it will give you and idea of many things without having to pull the head.
Are you sure the timing is correct?
Good luck
Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
Run a compression check first. If the valves are not closing the compression will be low. Also, depending on how hot it got, the could have been damage to pistons or rings. Do the compression test dry first. If you have any cylinders low, check it again with a squirt of oil in the cylinders. If the oil brings the compression up it is pistons or rings. If not, valves.
