Rocker Arms on passenger side broke?

Tiny
HARTHAUGE
  • MEMBER
  • 2016 FORD F-150
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 137,000 MILES
We recently replaced all intake valves as cylinder 8 had a burnt intake valve. After putting back together the Timing was off, this caused the intake rocker arms on passenger side, not driver side, to break. Are my valves now bent? Is there a way to find out without pulling the head?
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Monday, November 7th, 2022 AT 10:27 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

If you have bent valves, oftentimes you can tell by watching if they fully return to the closed position. If they are bent, it's unlikely they won't close fully.

You can use a borescope to look down into the spark plug holes to see if there is evidence of damage. Keep in mind, if they hit hard enough to break the rocker arms, there could be damage to the pistons.

If the engine is placed in time and the damaged parts are replaced, you can perform an engine compression test. If you have a bent valve, oftentimes there will be little to no compression in the affected cylinder.

Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-test-engine-compression

Let me know if you have other questions or if I can help in any way.

Take care,

Joe
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Monday, November 7th, 2022 AT 8:04 PM
Tiny
HARTHAUGE
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Thanks for your response. The pickup was not turned over for very long when this problem occurred (after putting everything back together). It broke all 8 intake rocker arms. I am concerned the valves are damaged (just replaced them!). But being it wasn t turned over very long, still think the damage is done? Thanks for responding.
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Monday, November 7th, 2022 AT 8:15 PM
Tiny
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Is there also a reason why only the passenger side would break and not both sides?
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Monday, November 7th, 2022 AT 8:28 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

As far as the driver's side, it is all based on how the timing was set. If it was incorrect, the opposite side may have not been in the position to be hit. That is what I believe happened.

As far as not turning it over very long, that usually doesn't matter. If it was hitting hard enough to break the rocker arms, it was hitting extremely hard.

When I work on timing any engine, once I have the marks set and put back together, I always turn the crankshaft by hand at least four or five rotations gently to see if it stops turning at any point. It's just a way to make sure there isn't going to be interference.

Let me know what you find and what I can do to help.

Take care,

Joe
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Monday, November 7th, 2022 AT 9:05 PM
Tiny
HARTHAUGE
  • MEMBER
We re-assembled the engine, correctly timed chains. It turns over freely but will not fire. What s the issue?
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Thursday, November 10th, 2022 AT 2:45 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Does the engine sound normal when it is cranking? Is it possible for you to record it cranking and upload it for me to hear?

Also, have you checked for spark to the plugs and fuel?

Let me know.

Joe
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Thursday, November 10th, 2022 AT 7:38 PM

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