Lifters
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==Roller== | ==Roller== | ||
| + | Shown below is a GM hydraulic roller lifter. A flat tappet lifter has the same internal construction as the roller lifter. The arrow shows the location of the cup, spring and check ball assembly mentioned [[Lifters# Replacing lifters|'''below''']]. | ||
[[File:Oem hyd roller lifter expolded view.jpg|left|frame|OEM GM hydraulic roller]] | [[File:Oem hyd roller lifter expolded view.jpg|left|frame|OEM GM hydraulic roller]] | ||
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===Mushroom lifter=== | ===Mushroom lifter=== | ||
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| + | =Replacing lifters= | ||
| + | Before replacing a stuck or noisy lifter (which should only be done as a LAST resort), disassemble the lifter that is in question. You will see a cup, spring and check ball assembly snapped onto the bottom center of the "piston" of the lifter. Often all that has happened is the cup assembly isn't fully seated into the recess on the bottom of the piston. | ||
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| + | Remove the cup using a pick and see that the tiny spring and check ball are there and that the ball isn't scored and that the seat on the piston that the ball seals, doesn't have any ridge or imperfections that would prevent the ball from seating properly. | ||
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| + | A better choice if the lifter's piston is found to be unrepairable, would be to replace the piston (from another lifter) and reuse the lifter body that has broken in to the lobe that it started life running on. The lifter foot and the cam lobe quickly wear in together to become a unit- using a new lifter risks wiping out the cam lobe. | ||
| + | [[Lifters#Types of lifters|'''Return to top''']]. | ||
[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Undeveloped articles]] | [[Category:Undeveloped articles]] | ||
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