Why did this Honda Pilot break?

[yonyon]

I didn't get to hear much of the story behind this one. I've never seen anything like it before. Any idea how that would happen?

 

[Roadkingnc]

It lost oil pressure and seized in the cylinder head.

 

[Trav]

Do you have a picture from a side angle?
It looks like some sort of failure in the VCM control.

 

[yonyon]

No, that's all I have. It was a pretty busy day today so, unfortunately, I didn't have much opportunity. Another guy was looking at this one; I'm just curious as to how that could happen. It turns out to have an extended warranty and was towed away.

 

[Trav]

There was a guy with similar damage here a while ago, i don't remember the cause only it was something with the VCM.

 

[Phishin]

I'm not familiar with engines to know problem you guys are seeing....so what's wrong here?

 

[yonyon]

The rear camshaft has broken into two pieces, Phishin.

 

[gregk24]

Yeah I dont see whats wrong, but Im not familiar with what the J35 looks like under the valve cover.

 

[dishdude]

The camshaft is bent like this /\. That's usually a problem!

 

[Ram01]

Maybe the 0w20 motor oil they using is the problem

 

[Plumber]

Okay, I see the bend.

 

[PeterGreen]

Originally Posted By: Ram01
Maybe the 0w20 motor oil they using is the problem


funny!

 

[michaelluscher]

Post this over on the subreddit /r/justrolledintotheshop
They should recognize le carnage

 

[01rangerxl]

Very early 5.7L Tundras had this issue...apparently there was a metallurgical defect with the cams. Could be a bad run of cams or something.

Any idea if this Pilot had the variable cylinder control? Would be interesting to know if that feature causes durability issues.

 

[yonyon]

Yes, it has VCM (or did anyway) and as Trav (he's usually right) has explained there can be some nasty problems, but as to whether or not the VCM broke this camshaft?

I was hoping you guys would know.

 

[Trav]

This has me curious also I was hoping to see if the rocker arms were in one piece or had one come apart and jammed the cam.
Timing belt ok?

Something apparently caused the cam to stop abruptly with enough force to break it. This one of those times you wish had more time with it.
I have more questions than guesses.

 

[yonyon]

There will probably be some time to ask a few questions about it today.

 

[cptbarkey]

Originally Posted By: michaelluscher
Post this over on the subreddit /r/justrolledintotheshop
They should recognize le carnage


and conjecture all day long. what else is there to talk about.

 

[threeputtpar]

The cam lobes don't look all that spectacular, either. Maybe conventional oil run at too long of intervals? The residual oil in the head doen't look too good either.

 

[Trav]

Yonyon, looking at the pic closer it seems the valve on the right is bent or is that just the camera angle?
Maybe the timing belt or tensioner let go.