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  #1  
Old 04-17-2004, 02:25 PM
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Join Date: Jan 2003
Location: MA
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500 SEC rough idle

Yesterday I replaced a bad rocker arm and lifter. While I was there I put in a new set of spark plugs. Now the idle is rougher then it was with a bad rocker.

My neighbor thinks it's a worm cam against new parts.
Does the rocker and lifter need time to seat themselves? Any ideas are helpful.
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  #2  
Old 04-17-2004, 02:50 PM
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It is possible that the lifter hasn't done its job yet. The lifters job is to hydraulically bridge the gap between the rocker arm and valve.

It has the ability to be different lengths. When the rocker was removed the lifter went to full length. Upon reassembly it does not necessarily accomidate its new length. If it stays long the valve won't go closed.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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  #3  
Old 04-17-2004, 04:13 PM
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Steve,

Thanks for the response. The rough idle does seem like a valve not closing properly.

If the lifter is too long are you saying it will correct itself or do I need to make some kind of adjustment?
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  #4  
Old 04-17-2004, 04:55 PM
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Usually they will compress after a short time running. The level of compression is an adjustment and what we usually do is take the lifter out and squeeze the oil out in a slow compression in a vise. Once the oil is out the lifter easily compresses before the valve is lifted. Once at the right length the lifter fills with oil at its own rate and becomes semi incompressable at the right length.
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Continental Imports
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