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bent/snapped push rods??

Old 01-26-2019, 11:42 PM
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Question bent/snapped push rods??

whats up guys, been trying to revive a 94 zj 4.0 thats been sitting but it has been a difficult time lol.

Fixed a fuel pump then the next morning it did not have compression and bent #1 and #6 push rods.

Fixed the push rods and then the next morning it did not have compression in all cylinders. #6 push rod snapped (the one i replaced)

Did i install the push rod wrong or do i have sticky valves or bad lifters??
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Old 01-27-2019, 06:29 PM
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I must assume the push rods are stock length.
Sounds significantly stuck. I can understand your not expecting this result.
I am thinking stuck valves but never seen such a stick as to snap the pushrod.
I am inclined to recommend a witches brew of brake fluid, oil and WD40 mixture.
This is a "dark side mixture for penetrating and releasing seized parts".
Handle like cryptonite.
Soak the internals with this to free up an stickies.
Will require a complete oil flush afterward. A second complete flush is also recommended.
Beyond that it's and engine pull and tear down.
All the best of luck!
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Old 01-28-2019, 08:11 AM
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Goodness, something is major wrong here. Does it turn over ok with the starter? My first thought is the timing chain jumped, but unsure if this would cause the valves to hit the pistons. If you broke pushrods, your lifters are crushed. Id be taking the head off that one.
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Old 01-28-2019, 11:23 AM
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Originally Posted by 97grand4.0 View Post
Goodness, something is major wrong here. Does it turn over ok with the starter? My first thought is the timing chain jumped, but unsure if this would cause the valves to hit the pistons. If you broke pushrods, your lifters are crushed. Id be taking the head off that one.
Turned over fine, took the head off and #6 valve isnít seated all of the way, gonna replace lifter while Iím in there and gonna buy a new head and hope that fixes the problem. Should I look for anything ?
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Old 01-28-2019, 11:25 AM
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Originally Posted by peep View Post
I must assume the push rods are stock length.
Sounds significantly stuck. I can understand your not expecting this result.
I am thinking stuck valves but never seen such a stick as to snap the pushrod.
I am inclined to recommend a witches brew of brake fluid, oil and WD40 mixture.
This is a "dark side mixture for penetrating and releasing seized parts".
Handle like cryptonite.
Soak the internals with this to free up an stickies.
Will require a complete oil flush afterward. A second complete flush is also recommended.
Beyond that it's and engine pull and tear down.
All the best of luck!
thanks for the reply! Iím gonna say screw it and buy a new head with new valves and everything! The engine sat for probably 6+ years so that might have something to do with it lol
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Old 01-28-2019, 11:42 AM
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Originally Posted by Cooperisnothere View Post

Turned over fine, took the head off and #6 valve isnít seated all of the way, gonna replace lifter while Iím in there and gonna buy a new head and hope that fixes the problem. Should I look for anything ?
Also, I dont think she skipped timing, it would not start the next morning, so if thats the case it skipped timing overnight
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