Adjusting hydraulic lifters
From Crankshaft Coalition Wiki
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==A word on the correct length pushrod== | ==A word on the correct length pushrod== | ||
| − | To obtain the correct valve train geometry, the correct length pushrod needs to be determined and installed before setting the lifter preload. Below are some things to check that could have changed the correct pushrod length: | + | To obtain the correct [http://www.crankshaftcoalition.com/wiki/Valve_train_geometry '''valve train geometry'''], the correct length pushrod needs to be determined and installed before setting the lifter preload. Below are some things to check that could have changed the correct pushrod length: |
#Camshaft base circle diameter | #Camshaft base circle diameter | ||
#Pushrod length due to wear or replacement | #Pushrod length due to wear or replacement | ||
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#Valve seat height changes from seat replacement or from valve seat grinding/cutting done during valve jobs | #Valve seat height changes from seat replacement or from valve seat grinding/cutting done during valve jobs | ||
#Grinding the tip of the valve stem when doing a valve job or different length valves | #Grinding the tip of the valve stem when doing a valve job or different length valves | ||
| − | #Lifter height due to different manufacturer | + | #Lifter pushrod seat height due to different manufacturer |
| − | #Change in rocker arm type | + | #Change in rocker arm type, design, or ratio |
==How much preload should I use?== | ==How much preload should I use?== | ||
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==Can I replace a damaged lifter with a new lifter?== | ==Can I replace a damaged lifter with a new lifter?== | ||
| − | [[File:Lifter expolded view.jpg|thumb|200px|left|Arrow points to check ball retainer]] | + | ;{{Note1}} See [http://www.crankshaftcoalition.com/wiki/Lifters#Repairing_or_replacing_lifters Repairing or replacing lifters] |
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| + | [[File:Lifter expolded view.jpg|thumb|200px|left|Arrow points to check ball retainer on the end of the plunger]] | ||
[[File:Lifter clips 002.jpg|thumb|350px|Three styles of lifter cup retainers. The [http://www.truarc.com/pdfs/Truarc%20Catalog.pdf internal C-clip type] is stronger and should be used especially with solid lifters or when "zero lashing" lifters.]] | [[File:Lifter clips 002.jpg|thumb|350px|Three styles of lifter cup retainers. The [http://www.truarc.com/pdfs/Truarc%20Catalog.pdf internal C-clip type] is stronger and should be used especially with solid lifters or when "zero lashing" lifters.]] | ||
| − | + | When a lifter is noisy, often all that has happened is the check ball retainer assembly isn't fully seated into the recess on the bottom of the plunger, or a speck of dirt has lodged between the check ball and seat. This can be fixed, but requires the intake to come off to get to the lifter. Usually you can clean up the sludge inside the lifter using carb cleaner and it will perform fine again, but first check the surface of the lifter that faces the cam, if it's flat or concave just trash it, it must be sligthly convex. | |
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| − | + | Shown left, is a disassembled GM hydraulic roller lifter. Most current flat tappet lifters have the same internal construction as this roller lifter, although there are different styles. But as long as the styles are the same, the piston from one can usually be fitted into another body. The arrow shows the location of the cup, spring and check ball assembly mentioned above.<br style="clear:both"/> Details are at the page linked to above. | |
===Chevy OEM hydraulic roller cam and lifters=== | ===Chevy OEM hydraulic roller cam and lifters=== | ||
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