Bent push rods
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Freshman User
Joined: Aug 1999
Posts: 41
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Bent push rods
Just installed a remanufactured 351M in a 1981 F-150. This new engine is bending the exhaust push rod on the #4 piston on the lefthand side. I'm guess a couple of things.
1. Valve sticking to the head
2. Bad lifter (any way of testing it?)
3. Bad geometry of the rocker arm?
4. Cam problem?
5. Too tight of an adjustment?
Here is the issue. Engine runs fine. Let it sit one day, crank it the next day and the engine bends the push rod!! It's done it twice already. Replaced the rod and engine cranks up and runs fine? What is happening after the engine sits overnight?
Sure would hate to pull the engine!
1. Valve sticking to the head
2. Bad lifter (any way of testing it?)
3. Bad geometry of the rocker arm?
4. Cam problem?
5. Too tight of an adjustment?
Here is the issue. Engine runs fine. Let it sit one day, crank it the next day and the engine bends the push rod!! It's done it twice already. Replaced the rod and engine cranks up and runs fine? What is happening after the engine sits overnight?
Sure would hate to pull the engine!
Lead Driver
Joined: Nov 2000
Posts: 6,635
Likes: 349
From: Albuquerque
Bent push rods
Well the lifters have no adjustment. If they over machined it you might bottom out a lifter. Different length push rods and shims for under the pedestals are available.
I could be that the push rod is sitting on the lip of that particulay lifter instead of the seat.
Bear Tracks
I could be that the push rod is sitting on the lip of that particulay lifter instead of the seat.
Bear Tracks
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