112,xxx miles and loud knocking noise

TwinDmax · **Posted:** Sun Jun 24, 2007 10:46 pm

I bought an 02 libby from my used car department a few days a go because I knew the truck was headed to the action anyways. I tried changing the oil and seafoaming the truck but the knock is still evident. At one time the knock almost went away entirely. At first it sounded like a rod but I am thinking it may be a lifter.
In addition, I have access to a junkyard engine w/ 30k. miles on it for $1300. Should I just change the engine or try to salvage the one I already have?

Jeepjeepster · **Posted:** Mon Jun 25, 2007 12:54 am

How loud of the knock? Mine has one on start up but it usually goes away after the engine warms up. It can be kinda loud in the winter..

DarbyWalters · **Posted:** Mon Jun 25, 2007 6:14 am

Wrist pins can go and cause the piston to slap the cylinder walls. I bet if you took the valve covers off you would find some serious "sludge". Vavle springs are also suspect...they crack.

TwinDmax · **Posted:** Mon Jun 25, 2007 8:01 am

the knock is loud and only went away once. As soon as the ac turned on the knock resumed and has not gone away since. Is it a better idea to just purchase the used engine than repair the one I have?

Dje Ryu · **Posted:** Mon Jun 25, 2007 8:11 am

have you had the A/C off since then? The pulley on the A/C compressor seems to rattle pretty loudly on mine but, it goes away when the A/C is off.

DarbyWalters · **Posted:** Mon Jun 25, 2007 10:14 am

I would say if you can't find the problem up top...vavle/lifters/ac compressor...put in the 30k engine. Save the other engine for a stroker kit...lol

detroit_doc · **Posted:** Mon Jun 25, 2007 12:12 pm

check the tensioner and idler pulley.

TwinDmax · **Posted:** Mon Jun 25, 2007 5:02 pm

I got suckered into purchasing the engine today (They said they had someone else interested it as well) 1300isn't too bad for a complete drop in assembly. I will have it installed in the next two/three days by one of my mechanics. After all the work I did in my chevy I am burned out on working on vehicles on my only days off.

snow blower · **Joined:** Thu Feb 16, 2006 4:24 am **Posts:** 69

anyone having noise with the blower units should take it in for the recall.... i got a letter in the mail from DC, and had the blower motor replaced... due to a potential fire hazard :shock:

112,xxx miles and loud knocking noise

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