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lifter tap???

lifter tap???

Postby dmonotjr [OP] » Aug 18 2011, 3:46am

hey guys, new here, but im having a issue with my truck- hope ya'll can help! i have an '07 classic crew with the 4.8. it roughly has 158000 mile on it and im getting a tapping noise. it happens at any time of the day, cold mornings, hot evenings, first starts, radomly while driving. the local gm dealer told me its a lifter tapping if its not a consistant tap, if it was consistant- it would be a camshaft. just looking to confirm this theory 1st off, then... do i drop the nearly $1000 to repair the high mileage 4.8, or buy a new one, or upgrade to a 5.3/6.0... any help is appreciated guys
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Re: lifter tap???

Postby zacharyh687 » Aug 18 2011, 4:12am

Try switching to a heavier oil. if you are using 5-30 try 10-40 sometimes that can help
otherwise i would seek another opinion before your set on it being a lifter. an exhaust leak at the manifold can sometimes sound like a lifter tap also a leak at the donut gasket can sound similar..

Just some things to look at
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Re: lifter tap???

Postby Kansas » Aug 19 2011, 6:34pm

Heavier oil would also be my first choice if an exhaust leak is not found. 158k miles is half-life or under if you do regular maintenance. I have taken a valve cover off and cranked a lifter down but no more than 1/4 turn to quiet one. That was in the old days, probably wouldn't do that today. Well, maybe I would. $1000 is a lot of money. You can get a whole motor for that.
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Re: lifter tap???

Postby 98 gmc 4x4 » Aug 19 2011, 6:42pm

I dont think you can get a new motor for 1000 bucks maybee a good used one for that price.
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Re: lifter tap???

Postby Kansas » Aug 19 2011, 7:40pm

Yeah, used with a salvage guarantee and you pull it yourself. Forgot what a lot of these forums are about. Not necessarily fixing an issue.
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Re: lifter tap???

Postby zacharyh687 » Aug 19 2011, 8:27pm

If I remember right you can get a new long block for about 1500 bucks it has been awhile since I have looked at prices but that was for a 5.3l
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Re: lifter tap???

Postby dmonotjr [OP] » Aug 19 2011, 11:55pm

i had tried a heavier oil, a lighter oil- nothing seems to effect the noise at all. im pretty sure it is a lifter tap myself, i looked all over my exhaust for signs of a leak- clean.i priced out everything from gm to repair it- $1157.27! that does include a new camshaft too (hate to not change it & it goes out in 6 mths), all new lifters, new intake gaskets, exhaust gaskets, timing cover gaskets, valve cover gaskets, complete head bolts for both heads, and a few other little related items. BTW, that price is for gm employee pricing too!!! my buddy just started working at my local gm dealership-using his employee discount
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Re: lifter tap???

Postby Z15 » Aug 20 2011, 12:19am

It could be its getting worn out, weak or it could gummed up from oil deposits.

Maybe something like this will help clean it out, it might work....Just dump it into the oil, let is run for 15-20 min and change the oil. I had one customer say it quieted his noisy lifters on his 6-cyl Furd.
ImageEngine and Transmission Flush Product Code: FLSHCN-EA
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Re: lifter tap???

Postby Kansas » Aug 22 2011, 12:59pm

Didn't see you mention anything about timing gears and a chain or pressing in new cam bearings, just a bunch of gaskets which is what most call a rebuilt engine. You'll be damn lucky if they just don't crank down the noisy lifter and charge the hell out of you for it. From my own perspective when I said heavier oil I should have been more clear. I have an old IHC truck that is shot, clatters, smokes, too expensive to rebuild, etc. I put 80-90wt gear lube in it and pull it to start, once a year in the fall to cut wood, purrs like a kitten, gets the job done. I'm not advocating that for your truck, but, you put some Castrol 50wt in it and a couple bottles of STP or engine honey and if it still clatters, it's not a lifter, or anything lubed by engine oil. Or the engine is completely shot in which case your GM dealer will open it up and you'll have a nice 4k bill to pay. What's you friggin' oil pressure dude? That's the first indicator of how tight an engine is. Compression test? The Amsoil I'd do that first, and then if it still ticks, the 50wt.
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Re: lifter tap???

Postby adams99z71 » Aug 22 2011, 3:53pm

ive had lifter noise since i bought my truck at 105k miles, at 190k i put a half quart of ATF in the oil ran the motor for 50 miles then switched to castrol synthetic 5w30. currently im running royal purple synthetic 5w30.
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