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Old November 10th, 2007, 10:45 PM   #1
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Default 360 LA lifter noise help...

Ok so my jeep has some lifter noise. Probably has around 1000 miles on it since a complete overhaul. The lifters are hyd. Its when you get it up to around 3k you can start to hear them, than anywhere past that it gets louder.

It can be heard on both sides of the engine.

any ideas???
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Old November 11th, 2007, 12:11 AM   #2
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re tighten the rocker arm rail. it will help some.
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Old November 11th, 2007, 12:22 AM   #3
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its torqued to the spec of 30ft lbs. I think thats what it is.??

I did re-check them while ago, guess i should check again
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Old November 11th, 2007, 12:35 AM   #4
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roller rockers are noisier than regular, if you made the upgrade.
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Old November 11th, 2007, 12:38 AM   #5
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nope i did not, stock stuff
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Old November 11th, 2007, 01:54 AM   #6
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It must not be getting enough oil into the lifters at higher rpm. how heavy is the oil your running? Did you replace the lifters in the rebuild?
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Old November 11th, 2007, 03:46 AM   #7
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x2 what user name said
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Old November 11th, 2007, 03:02 PM   #8
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yes everything is brand new. I did a mild build up, new hyp. sealed power pistons, raised compression, cam, lifters, timming chain, yada yada yada....

I am running 10w30 Mobil 5000. Should i switch to a heavier oil to see if it clears things up??
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Old November 11th, 2007, 03:21 PM   #9
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Is that synthetic...IIRC synthetic is not the best for rebuilt engines.
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Old November 11th, 2007, 03:57 PM   #10
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its regular oil.
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Old November 11th, 2007, 04:22 PM   #11
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I'm not really sure I guess a trying out a little 10w40 would be cheap and wouldn't hurt but I don't know that it would help any either. Are you sure it's not something else making noise? I would ask on allpar.com .
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Old November 11th, 2007, 06:49 PM   #12
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I had some aftermarket lifters do that once, I think they were iskys or comp cams I don't remember. Anyway when I pulled the new lifers out and compared them to the old ones I found the oil grove was machined a little lower on the lifter than the origional one. I replaced them with some Mopar brand ones that were machined correctly and the noise went away.
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Old November 11th, 2007, 07:48 PM   #13
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Quote:
Originally Posted by v2win View Post
I had some aftermarket lifters do that once, I think they were iskys or comp cams I don't remember. Anyway when I pulled the new lifers out and compared them to the old ones I found the oil grove was machined a little lower on the lifter than the origional one. I replaced them with some Mopar brand ones that were machined correctly and the noise went away.
that sounds like what I was thinking but I didnt think anyone would make lifters like that.
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Old November 11th, 2007, 10:44 PM   #14
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Quote:
Originally Posted by Plato2k5 View Post
yes everything is brand new. I did a mild build up, new hyp. sealed power pistons, raised compression, cam, lifters, timming chain, yada yada yada....

I am running 10w30 Mobil 5000. Should i switch to a heavier oil to see if it clears things up??
Are the rockers new, or did you reuse the old ones?

Stock stamped MoPar rockers have a tendency to punch through when you use a higher lift cam- I always use adjustables with faster rate of rise cams.

I doubt the oil will make a difference- ifit is rattling with 10w30, it should still rattle with 10w40. The first number is its viscosity with the oil at operating temp
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Old November 12th, 2007, 12:39 AM   #15
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The cam is more aggresive. I will have to get the specs.

The rockers are stock stamped ones, stock pushrods.

The cam is a comp and it came with the hyd. lifters.
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Old November 12th, 2007, 06:28 AM   #16
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Quote:
Originally Posted by Plato2k5 View Post
The cam is more aggresive. I will have to get the specs.

The rockers are stock stamped ones, stock pushrods.

The cam is a comp and it came with the hyd. lifters.
I've read this thread over a few times you've never said anything about valvesprings
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Old November 12th, 2007, 01:52 PM   #17
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I was told i could re-use my valve springs from various people on mopar forums. They are edelbrock springs from the performer RPM package. Thats the came that was in when i bought the engine.
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Old November 12th, 2007, 04:46 PM   #18
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Pull the valve covers and start it up. (A set of stock steel covers with everything but the exhaust manifold side cut away work great for this, BTW) Watch the rockers and check to see if they all move the same amount. Should be pretty obvious, even at idle-2K RPM, but you can rev it with the modified valve covers in place.
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Old November 12th, 2007, 09:26 PM   #19
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Valve springs shoudnt have anything to do with the lifter rattle. The pushrods could not have enough preload on them though.

You do have oil in the top of the valve train?

Is it possible to fish one of the new lifters out and compare it to and older lifter..
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Old November 13th, 2007, 01:50 AM   #20
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How much was milled off the heads/block decks??

You did say you raised the compression. If you cut more than say .020 or .030 you would need to shim up the rocker shafts. Also, since these are non adjustable rocker arms, the valve tip heights are critical because everytime a valve job is done it raises that tip height. Also, if the cam has more lift someone better have checked the retainer to seal/guide clearance. If you do pull a valve cover, run a straight edge along the tops of the valve tips and see how in line they are. They shouldn't vary more than say a 32nd of an inch (.031").
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