Cam retainer plate wear/rubbing

[redmund01]

I had a lifter spring break at 105k on my 14 Sierra 6.2 and bent a pushrod. I am in process of tearing everything down and replacing the cam with a BTR stage 2 kit, lifters, springs, pushrods, trunions, oil pump, chain tensioner, long tube headers, and so on.

When I removed the cam retainer plate I noticed an uneven ring of wear from the phaser. Thoughts on what may have caused this? I was planning to re-use the phaser but now thinking that I should get a new one.

Also, on the block there is a flat machined in area for the chain...is that factory to leave that metal burr or was the chain loose and chafing in on the block? It almost looks like the chain was hitting there but did not appear to be any indication of that on the chain itself.

[redmund01]

[redmund01]

Here is the culprit! Broken AFM lifter spring...luckily/somehow that little piece was still in assembly and did not go through the engine. Cut open the filter and took apart the oil pans and did not find any other metal

[customboss]

Most important question first, is that a Citabria you are flying? You an A&P too? 

 

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[rlcole321]

I did the same thing with my 18 'Rado 5.3L, (BTR cam and long tubes) now I didn't see any of that on my cam plate, if that ware is between the cam phaser and plate, then something was "pulling" the cam inward forcing the phaser against the plate. If you are not the original owner, possibly someone had the motor out and something happen the cam end cap??, did you pull the cam yet?, did you see any bad ware on the lifter rollers?, might need to look into that a little further (also the HPFP, it uses a lifter too). Also are you familiar with HPTuners?, if not, you should get one and learn it, you'll need to do a lot of "Retuning" once you install all those go fast parts. Also you'll need to know a lot of fasteners can't be reused. suggest watching some YouTube videos on cam replacements for LS/LT motors.  Good Luck!