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gudfshn3
Bone Stock
Posts:7
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| 02/13/2008 6:48 PM |
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| I have a 2001 2500HD Silverado |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 02/14/2008 6:19 PM |
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| Gas or diesel engine? |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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gudfshn3
Bone Stock
Posts:7
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| 02/18/2008 9:15 PM |
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| gasoline |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 02/18/2008 9:48 PM |
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Well, if it is indeed piston slap, then the noise should go away after the engine warms up.
GM did indeed have issues with piston slap in the early 2000's, but it was only common in engines with hypereutectic pistons (high silicone content in the aluminum alloy structure), and if I remember correctly, it was only a problem with the 3.1L 6cyl (J-sieries VIN motors) engines, not the V8's that were in the trucks.
Also, piston slap won't go away when oil gets to it, piston slap is caused by excessive oblongation of the cylinder bore, thereby allowing the piston to move side to side, in addition to the up and down motion that is part of the reciprocation.
So... you either have a lifter (or two) that have bled down and it's ticking until the oil pressure builds, and subsequently replenishes the hydraulic pressure in the lifters (probably the real culprit here), or you have legitimate piston slap (less likely).
Have you checked your oil pressure when you first fire up your engine? If so, what is it reading?
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
- - - - - - - - - - - - - - - - - - - - -
'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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gudfshn3
Bone Stock
Posts:7
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| 02/22/2008 8:39 PM |
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| When I started the truck this morning, it read right at 50, and the same thing this afternoon when I came home. If it is in fact a lifter...is that fixable?!?! |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 02/23/2008 11:29 AM |
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yes, it's fixable, but it's a fairly major top-end engine tear-down (fuel injection removal, intake manifold removal, etc.).
However, you should first diagnose where the noise is really coming from. Have you tried using a mechanic's stehescope to try and isolate where the noise is coming from? You can get one at a local auto parts store for under $20 usually.
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
- - - - - - - - - - - - - - - - - - - - -
'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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gudfshn3
Bone Stock
Posts:7
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| 02/25/2008 8:43 AM |
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| Havent tried the stethoscope, but the tick is pretty loud at idle speed to hear where its coming from. |
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brandy
Bone Stock
Posts:29
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| 02/28/2008 6:27 PM |
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| the stethescope works because we had a problom like that and we found it. ours was a broke wristpin so we rebilt the hole engin.dont you just love it i would love to work onengins all day |
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