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  #1  
Old 06-25-2002, 11:46 AM
dpetryk's Avatar
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Hydraulic Compensators (Valve lifter) questions.

I am working on a 5.6 liter V8 117 series engine. During the inspection of the valve train components, I found one of the hydraulic valve clearance compensators (AKA valve lifters) did not move like the others. It appeared to be frozen. All the others seemed to be spring loaded and the moved a bit.

So I took this one out and tried to unstick it. Which I did. I was able to pull it apart and clean it with solvent. It appeared that oil crud had caused the thing to sieze up and not slide as it should. There are no rubber parts in the thing, only a spring. It looked like the oil had sludged up or something and caused the plunger part to stop sliding.

I assume these things "compress" a little bit during the valve opening cycle and are designed to compensate for temperature changes and any extra clearance. If they are worn out they would probably compress too quickly due to oil leakage past the plunger. But if they are not worn out, just gummed up it would seem to me that cleaning them should bring them back to a usable condition.

My question is this; Can these things be cleaned if they are frozen and will they operate as they should after the cleaning process, or should they just be replaced?
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  #2  
Old 06-25-2002, 12:02 PM
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Picture of the lifters.
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Hydraulic Compensators (Valve lifter) questions.-mvc-669l.jpg  
__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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  #3  
Old 06-25-2002, 07:40 PM
dpetryk's Avatar
Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
These things are not like the typical rocker arms. The adjustment of valve clearance is accomplished thru the use of different thicknesses of thrust plates (item #8 in the dirgram.) There is no adjustment like on the american V8's.

I was hoping to hear from somebody that might have tried to clean these things and find out how well it worked.
Attached Thumbnails
Hydraulic Compensators (Valve lifter) questions.-rockers.jpg  
__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
Reply With Quote
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