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#1 |
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Join Date: May 2006
Location: Southwest Florida
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Sad to day you may have a worn camshaft. Have seen a few in the dealership with a top end tick noise.
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Mark Ruset 2048 STK |
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#2 |
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#3 |
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Join Date: Jun 2006
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GM had a bulletin # PIP4499B regarding lifters also u might check oil pump O ring over time (yours is old 248K and 10 years) they get hard and do not seal properly allowing air to pass thru the system and causing intermittent oil pressure very common in 5.3 engines
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#4 |
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Join Date: Feb 2002
Location: Southeast Michigan
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If you Google GM lifter/valvetrain noise there are a lot of "fixes" . Most involve pouring some type of product into the oil to clean crud out of the lifters . Seafoam comes to mind , or Marvel Mystery Oil . Worth a try before getting inside the engine .
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#5 |
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Join Date: Apr 2005
Location: san antonio tx
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After not hearing it all weekend it came back briefly this morning when was still cold. No noise when I stopped for gas. BTW turned 249K this morning. So first thing this morning I will figure out which rocker/lifter/valve is making the noise, if it does it again, and then try some of the "fixes"mentioned. Still going to buy valve cover gaskets in case we have to pull a cover.
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#6 |
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Join Date: Sep 2011
Location: Belmont ohio
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I have seen many worn push rods and rocker arms the end of the push rod will look ovaled and shinier than the rest many cams and cam bearing but not for intermittent noise I work in a gm dealership
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#7 |
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Join Date: Nov 2008
Location: Glendora,Calif.
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Seems to me with a quarter million miles on it, the expeditious thing to do would be to replace the cam,lifters,pushrods and rocker arms. If one or two parts are worn beyond the valve train's ability to compensate for itself, the rest can't be too far behind. I'm sure that engine would have a steel roller camshaft as well. It probably wouldn't go flat and put shrapnel throughout everything, it probably would just wear down smoothly,but that and a new timing chain and gear set would probably set you right up.Who do you suppose has the record for the most miles on an original engine?
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#8 |
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Join Date: Apr 2011
Location: Forest Lk Minn.
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Check all the ex manifold bolts #7/8 are usually the culprit.We've done some of the HV oil pumps and they do work.Have seen a ton of bad lifters/rockers.(Noise is most noticeable on cold starts.)
former GM tech...good luck Marty
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Marty Hanft |
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#9 | |
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Idles smooth as glass in gear but stumbly in Neutral. Replaced parts and went through every electrical and fuel system. Between 3000 and 4500 rpm pulls but there are funny sounds. Feels and sounds like rocker/valve noise. Pulling the Valve covers ..nothing! Rebuilt LT1 being prepared by Rockville Ring & Bearing. Upgrading to a PerformaBuilt HD 4L60E OTW ! If this one does not live time for a 6L80E. Dan |
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