5.7 engine noise

Thompalone · May 21, 2018

I recently had to change out my cam and all lifters also changed out pushrods , rocker arms are tight however upon starting there is a sound that I thought was a constant lifter tap it is present at idle and all the way through acceleration, when I let off on the gas and the ECO/MDS kicks in the noise goes away and instantly returns when the gas pedal is applied..at a loss with what is happening and ideas ?

huntergreen · May 22, 2018

Subed

bigdodge · May 22, 2018

Pull the valve covers and check the rocker arms. R u sure u got the correct length pushrods? If everything checks good there then u have a bad lifter more than likely

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Thompalone · May 22, 2018

Yes the pushrods are correct, I am wondering if It is a valve guide. Lifters are new

RysRam · May 22, 2018

Another cam failure. Goddamit.

bigdodge · May 22, 2018

Did u soak the lifters?

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Thompalone · May 22, 2018

Yes I did...If it were the lifters would the noise not be constant?? The noise goes away when slowing down or when the ECO/MDS kicks in

bigdodge · May 22, 2018

If I'm not mistaking the lifter is what disengages the the cylwnders to be inactive. So if u don't hear it when deceleration or mds occuures then I would think one or more of the inactive lifters would be causing the noise. Just a guess but I would think it would have to be something u just changed if u didn't have it before.

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Thompalone · May 22, 2018

That makes sense...guess I will be pulling the heads back off yet again Thank you very much Dodge!!!

Tach_tech · May 22, 2018

Have you pulled the valve covers? Could be a bent pushrod if it wasn’t seated properly into the lifter. I’ve seen that happen before.

Thompalone · May 22, 2018

It was ticking ..so I put new pushrods in , and double checked to ensure they were seated properly

Thompalone · May 22, 2018

Pulled the valve covers and found play on the rocker arm and valve stem only on the ones that are MDS lifters. The rest are tight

bigdodge · May 23, 2018

Well that is definitely the noise. I would pull them out and make sure they are not bent. Other than that I'm not sure why they would be loose

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Thompalone · May 23, 2018

Not sure either unless the rocker arms are wore out..but idk cause it is only on the ones with MDS ..thinking about putting in 6.1 pushrods to see if that will tighten everything up

Tach_tech · May 23, 2018

How loose are we talking? If the cam is on the base circle for that cylinder the rocker will have a slight amount of side to side movement.

RysRam · May 23, 2018

You're probably already aware but the MDS lifters have different length pushrods than the non-MDS. Just throwing it out there

Tach_tech · May 23, 2018

RysRam said:
You're probably already aware but the MDS lifters have different length pushrods than the non-MDS. Just throwing it out there

They’re not actually, the intake and exhaust push rods are different lengths. Wether it is a mds lifter or not has no effect on push rod length.

RysRam · May 23, 2018

Tach_tech said:
They’re not actually, the intake and exhaust push rods are different lengths. Wether it is a mds lifter or not has no effect on push rod length.

My bad and thank you for the correction. Maybe some of the intake/exhaust pushrods are mixed up?

Thompalone · May 23, 2018

Correct..Thank you also there is no side to side movement ..it is up and down a good 1/16 of an inch between the rocker arm and the valve tip

5.7 engine noise

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