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Old 03-01-2013, 11:47 AM   #1
JDsilverado
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Default Lifter noise on 2000 5.3

I have a 2000 silverado 1500 Vortec 5.3 with 103,000 miles . When i start my truck after it has been sitting for more than 4 hours or so , i get a loud knocking noise that goes away after a 40-60 seconds. I am running Castrol GTX 5w-30. Not sure if i sould add an additive or switch to synthetic . I really dont feel like pulling heads


















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Old 03-01-2013, 11:57 AM   #2
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Default Re: Lifter noise on 2000 5.3

piston slap. its common. Let it warm up
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Old 03-01-2013, 12:50 PM   #3
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Default Re: Lifter noise on 2000 5.3

Maybe

You losing coolant?
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Old 03-01-2013, 02:03 PM   #4
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Default Re: Lifter noise on 2000 5.3

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Originally Posted by barrrf View Post
Maybe

You losing coolant?
my old truck was. other problem?
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Old 03-01-2013, 02:10 PM   #5
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Default Re: Lifter noise on 2000 5.3

Castech

Im sure you know of it.
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Old 03-01-2013, 02:31 PM   #6
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Default Re: Lifter noise on 2000 5.3

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Originally Posted by barrrf View Post
Castech

Im sure you know of it.
unaware. elaborate
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Old 03-01-2013, 02:38 PM   #7
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Default Re: Lifter noise on 2000 5.3

Castech head cracking issues. Affects most 5.3 heads from 99-05. There's a weak spot in one of the oil drain holes closest to the fire wall. Cause a wee bit of coolant to leak into the head - it also affects that lifter and doesnt allow it to pump up as quick as normal. Easy to spot the issue by popping a valve cover off and looking for sludge - also puff of blue smoke out of tailpipe on start up.

Ignore the Vehicles Affected part of this TSB - theres more TSBs detailing other vehicles.

http://ww2.justanswer.com/uploads/Bl...t_loss_5.3.pdf
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09-08, 13:13 Big Red Z71
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Quote:
09-08, 13:13 03SMURF
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[12-05, 14:05] Tim W if I had any idea how to do that in a manner that accomplished anything, we'd be done already
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Old 03-01-2013, 03:15 PM   #8
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Default Re: Lifter noise on 2000 5.3

Quote:
Originally Posted by barrrf View Post
Castech head cracking issues. Affects most 5.3 heads from 99-05. There's a weak spot in one of the oil drain holes closest to the fire wall. Cause a wee bit of coolant to leak into the head - it also affects that lifter and doesnt allow it to pump up as quick as normal. Easy to spot the issue by popping a valve cover off and looking for sludge - also puff of blue smoke out of tailpipe on start up.

Ignore the Vehicles Affected part of this TSB - theres more TSBs detailing other vehicles.

http://ww2.justanswer.com/uploads/Bl...t_loss_5.3.pdf
The Castech heads started in '03, did they not? To my knowledge, 99-02 is the the sand cast 862.
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Old 03-01-2013, 06:22 PM   #9
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Default Re: Lifter noise on 2000 5.3

Yeah Castech is an '03+ thing IIRC.

If it was a bad lifter it would make a tapping noise all the time, and vary w/ RPM.
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Old 03-03-2013, 11:36 PM   #10
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Default Re: Lifter noise on 2000 5.3

piston slap. pulling the heads wont fix anything. same issue with my 2000 yukon 5.3. I have 180k on original short block, and i just let it warm up before I put in gear. No blue or white smoke, and I believe the 2000 engines are before Castech was involved. Which oil you use wont really affect the piston skirt clearances, its more of a temperature issue than a lubrication issue. Ive seen engines that have ran both conventional and synthetic oil make the same noise. On pretty much any LS based engine the heaviest oil I would put in them is 10-30, unless you have really low oil pressure. Even with 180k on mine I still have 80psi at cold start and 45-50 at hot idle. I put 10-40 in it once and my pressure gauge was maxed all the time, certainly not good for the oil pump. just my $.02.
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