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4 intake rocker slapping all over the place. Push rod is…

Customer Question
4 intake rocker slapping...

4 intake rocker slapping all over the place. Push rod is straight.

Mechanic's Assistant: What is the model/year of your GM?

2012 Yukon XL Denali 6.2

Mechanic's Assistant: Are you fixing your Yukon XL yourself? What have you tried so far?

Valve cover is off. Rocker removed. Push rod removed (straight). In the process of removing intake manifold. Hoping to get to the lifters without pulling the head.

Mechanic's Assistant: How many miles are on the car? Have you noticed any leaks lately?

No leaks 112,000

Submitted: 5 months ago.Category: GMC
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Answered in 9 minutes by:
12/13/2017
GMC Mechanic: K. Wiggins, ASE Certified Technician replied 5 months ago
K. Wiggins
K. Wiggins, ASE Certified Technician
Category: GMC
Satisfied Customers: 3,450
Experience: ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
Verified

Hello, unfortunately the heads must be removed to access the lifters on this model. It's either going to be a collapsed lifter or stuck/bent valve that's the problem. I'll post info below for you on head removal. Let me know if I can be of further help.

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Customer reply replied 5 months ago
Valve was moving but not much. Push rod is straight.
What are the odds of cam lobe being damaged?
GMC Mechanic: K. Wiggins, ASE Certified Technician replied 5 months ago

Possible but unlikely, being roller lifter/cam they aren't as hard on cam lobe as the old flat tappets were. More than likely the hydraulic portion of the lifter has collapsed and isn't pumping up.

You can check the cam lift with a dial indicator possibly to verify the lobe isn't damaged once the lifter is out.

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GMC Mechanic: K. Wiggins, ASE Certified Technician replied 5 months ago

Hello, I was just wanting to follow up and see how things went.

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K. Wiggins
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