valve stem damage
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Posting Guru
Joined: Jan 2004
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valve stem damage
I just finished doing a set of head gaskets. . . and while I had the heads off. . . I noticed that two exhaust valves were damaged right at the tip where the rocker contacts it. Its like the nitride, nickle, or chrome covering(whatever it is) had peeled away and the tip looked like it was pitting, or corroding. I ended up replacing them. I'll try to get some pictures on here. Truck has 200K on it, anybody ever seen that?
Timmy
Timmy
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Wow, coating wearing off I can see but pitting and corroding in that oil bath environment I don't know. I too am curious and would like to hear opinions and see pics.
Senior User
Joined: Oct 2004
Posts: 366
Likes: 0
From: Monroe Center,IL.
I too would like to know what caused this.
I seen them in person due to its my truck, never seen a valve stem look like this.
I seen them in person due to its my truck, never seen a valve stem look like this.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Here is an idea for you.
This sort of problem is a very old one in my field with the old air cooled solid lifter VW engines.
They make a product that we call "lash caps". It fits over the damaged end of the valve stem, then you can properly adjust the valves.
I don't know if there is something like that for the Powerstroke, but these caps are designed to fit over an 8MM valve stem.
.
This sort of problem is a very old one in my field with the old air cooled solid lifter VW engines.
They make a product that we call "lash caps". It fits over the damaged end of the valve stem, then you can properly adjust the valves.
I don't know if there is something like that for the Powerstroke, but these caps are designed to fit over an 8MM valve stem.
.
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Will be posting pictures I promise.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
When I saw the title, I immediately though tire valve stem and wondered why the heck Tim was posting a question about a broken tire valve stem. Wow, was I way off base.
Unfortunately, I have no idea what could cause that. My mind says that a valve lash out of adjustment could cause some pounding on the stem and damage it, but with hydraulic lifters in the 7.3...I don't know.
Unfortunately, I have no idea what could cause that. My mind says that a valve lash out of adjustment could cause some pounding on the stem and damage it, but with hydraulic lifters in the 7.3...I don't know.