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Knocking lifter

Reebert123

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Reebert123 New Member

Reebert123

Posted
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Ok so here is my problem! I'm new here so hopefully I can get this rite lol!! 

 I have a 2004 suburban 5.3 vortec 2wheel drive! 

170,XXX miles on it. I've owned it for about a year now. Always took care of it. Truck is very nice and well kept up! 

 

So here is my issue. I was sitting in my buddy's driveway last nite talking for a min when I noticed a knock coming about! I mentioned it to him but we thought maybe it was just the AC compressor or something.( Noise was light at this time) so we think nothing of it continue to talk and I noticed it getting louder! So I get out and I swear it was a rod knock from in pan so I leave go home (about a mile away) shut it off stop for the night and tow it to my shop this morning... I drop the pan pulled all rod caps and checked the bearings then pulled all the main caps and checked those as well!! THEY LOOK GREAT! so now I go to the oil that I drained out of it prior to dropping the pan there is gold flakes of metal in my oil! So I keep looking to find that looking up between the crank I can see the cam shaft and I can see a lobe is shot!! So now I'm gonna put lifters and a new cam.... Now here is my question where did the gold flakes come from? As far as I know gold flakes are from a bad bearing correct???? But I don't have a bad bearing I have a bad lobe on my cam and a bad lifter!!! Would the bad cam lead to a bad cam bearing?? HELP ME PLEASEEEE

Charles_Colfax Enthusiast

Charles_Colfax

Posted
Posted

Similar to what my 06 Z71 has done.

Bought the truck in '16 with 86k from an auction wholesaler with NO maintenance history.

Tick started almost immediately.

Originally wasn't there at startup.

Started as a mild tick as engine came up thru temp.

Went away once at operating temp and under load (driving).

Would come back when sitting at idle.

Got progressively worse.

Now it's constant and louder.

Pretty sure at least one lifter has completely collapsed.

It sometimes feels like I'm only running on 7 cylinders.

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Charles_Colfax Enthusiast

Charles_Colfax

Posted
Posted
Cam bearing.  
Which one of our conditions were you referring to?

CMC

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swathdiver Senior Enthusiast

swathdiver

Posted
Posted
5 hours ago, Charles_Colfax said:

Which one of our conditions were you referring to?

 

The brass flakes in the oil.

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