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6.0 Chevy Power ?

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Bobl1958

04-27-2005 06:41:56

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I just made the plunge from a Cummins Diesel to a 2002 Chevy 6.0 gasser. I spotted this Chevy HD2500 with 35,000 miles and decided to make the trade. It is certainly a very nice rig, but sure not the torque of the Dodge, which I knew it wouldn't be. My question, however is I seem to notice what would seem like a collapsed lifter, or something, when I start it after it has been setting a few hours. It clatters and then quiets down. My son is thinking lifters, but my Dad, who has had new Chevy's for years, said all of his last few have sounded the same way. Have the 6.0's been noted for haveing any lifter trouble? I just went to Arizona and back, so my mileage is now over the warranty. Thanks for any input. Bob

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GregCo

04-27-2005 08:33:40

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Re: 6.0 Chevy Power ? in reply to Bobl1958, 04-27-2005 06:41:56

Sounds like the typical piston slap. As someone else said, the skirts are short and they rattle a little until they warm up and expand. I wouldn�t get too worried about it. There are thousands of them out there with the same noise and they live. I have also heard that some people are able to reduce the noise a little by using Mobile 1 in them. I have a 7.4 in my truck and it has had piston slap from the day it was new. It now has 91,000 miles on it and it has not gotten any more noticeable and has not caused any problems. The Mobile 1 did help reduce the rattle in the 7.4 when it is cold and first started. On a warm day I don�t even notice it.

Enjoy your new truck.

Greg F.

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04-27-2005 08:26:54

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Re: 6.0 Chevy Power ? in reply to Bobl1958, 04-27-2005 06:41:56

You got stuck with one of the "piston slappers." There is a reason why someone dumped it at 35,000 miles. The root cause is a mistoleranced piston/bore. GM claims this is normal and won't cover it so your SOL. Your best bet is to do a google search to see what other people are doing to get back at GM.

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buickanddeere

04-27-2005 07:39:58

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Re: 6.0 Chevy Power ? in reply to Bobl1958, 04-27-2005 06:41:56

The torque limiter backs off the Chev gas & diesel's engine's mid range output. The idea is to present a smooth flat power band to the driver. And limit driveline stress at peak torque. If you get the software and patch cord from www.hptuners.com . You can reduce the torque mamagement table by 50%, turn off the abuse mode and max out the max engine torque vs. gear table to 640 . The next time on the throttle will put the rear tires up in smoke on pavement.

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Jak

04-27-2005 11:18:50

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Re: 6.0 Chevy Power ? in reply to buickanddeere, 04-27-2005 07:39:58

Hey there Glen,we have an 03 3/4 ton Chevy truck with the 6.0 gasser.It does not impress me at takeoff but after 55-60 it gets a surge that changes the engine sound and she seems to be pulling harder.What was it that one can do to it that will unleash the power it has,cause I know something is holding it back?Ours will not scratch the pavement unless it is wet.

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buickanddeere

04-27-2005 14:57:45

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Re: 6.0 Chevy Power ? in reply to Jak, 04-27-2005 11:18:50

There is no mechanical link between the throttle pedal and intake manifold throttle blade ffrom 2003 onwards. When the engine is approaching it torque peak. The computer closes the throttle blades a bit to limit torque. Also during shifts the computer drops engine power then re-applies once the shift is complete.
That is a smart idea as it prevents neck snapping ,driveline jolting shifts. Without slipping/burning the clutch packs to obtain a smooth shift.

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ALLEN 6.0

04-27-2005 07:34:05

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Re: 6.0 Chevy Power ? in reply to Bobl1958, 04-27-2005 06:41:56

I work at a GM dealer and own a 6.0 you are hearing a wrist pin noise. I spoke with a service rep and it is normal. I would guess your noise goes way when it warms up.

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caseyc

04-27-2005 07:24:29

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Re: 6.0 Chevy Power ? in reply to Bobl1958, 04-27-2005 06:41:56

what in your right mind would make you trade a cummins for a 6.0L gasser????? ? i'd give my left you know what for a cummins, just can't find one to trade for yet ;>}

casey

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Ludwig

04-27-2005 12:35:29

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Re: 6.0 Chevy Power ? in reply to caseyc, 04-27-2005 07:24:29

If you drive under 15,000 miles a year and don't tow alot or carry really heavy loads then a diesel doesn't make much sense. The increased maintenance cost and the damage you'll do to the engine by underusing it will cost way more than the extra gas.

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Bobl1958

04-27-2005 08:53:37

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Re: 6.0 Chevy Power ? in reply to caseyc, 04-27-2005 07:24:29

I hear ya! I decided I don't really drive enough to warrant the extra cost of the diesel engine, as well as the high price of diesel. I think I was revolting the diesel price. lol I've had diesel engines for years, and guess I had a brain f@rt. I do like the truck, however, but just for a daily driver.

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Allan in NE

04-27-2005 06:55:57

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Re: 6.0 Chevy Power ? in reply to Bobl1958, 04-27-2005 06:41:56

Bob,

If you are located in a colder area, you are probably hearing piston slap. Probably don't hear it when the temps are in the70s or 80s?

Chevys newer motors don't have much of a skirt and almost all of 'em do that when they are cold until the piston expands.

Fact is, Chevy is gonna tell you it is normal; that's what they told me anyway.

Allan

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RustyFarmall

04-27-2005 06:46:01

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Re: 6.0 Chevy Power ? in reply to Bobl1958, 04-27-2005 06:41:56

I seem to remember Chevy doing a recall on the 6.0 for this same noise, but if I remember correctly the noise is more serious than just lifters? Maybe I am way off base?

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fatman

04-27-2005 21:44:17

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Re: 6.0 Chevy Power ? in reply to RustyFarmall, 04-27-2005 06:46:01

the noise you heard was most likely piston slap. unfortunately there is nothing really you can do to completely fix it. because it is an unfortunate side effect of the switch from a cast iron block to aluminum they needed to use slightly larger tolerances to compensate for the expansion rate of the aluminum block most new chevys have the same noise.

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FarmerSid

04-27-2005 09:16:17

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Re: 6.0 Chevy Power ? in reply to RustyFarmall, 04-27-2005 06:46:01

Check out www.pistonslap.com

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dennis in or

04-27-2005 10:00:13

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Re: 6.0 Chevy Power ? in reply to FarmerSid, 04-27-2005 09:16:17

i hear it all the time until warm . i've 136k on my 2000 7.4 just drove it from NC to OR pulling loaded trailor . after i replaced the fuel pump on the way ( that was a new experience), it ran like new.

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