hydrolic lifters...hellppp!!!

[93vinx]

i ahve 2 sets of hydrolic lifters, one set the center move in freely the other set they move hardly at all, some move a little and some not at all, what are they supposed to act like ?

[SappySE107]

You want a set that doesn't move at all, or less than 2mm give to them by pressing in.

[93vinx]

ok, well after talking ot my machine shop, they told me they can be taken apart, i'm not sure if he knos the exact lifter, mine move around 4 mm, is there a spring or what?, don't they fill with oil,

[SappySE107]

There is a spring in there and there should be a checkball (maybe not on our stock lifter?). They fill with oil and the oil pressure keeps them somewhat solid.

http://www.ina.com/inaupdate/news/publics/present/fach_dyn_simulation/fa_dyn_simulation_gb.asp

Check that out.

[93vinx]

so as for movement, minimal would be better?, or does it not matter when filled with oil?

wow there is alot of info there, lol

[SappySE107]

Well, it still matters when they are pumped with oil. They shouldnt move very much if at all without any oil pressure on them. At idle, they will pump up a lot, and at WOT they will probably have a bit more give than you can get away with. Its a performance issue as well as maintenance, but if they aren't collapsed, they aren't dead (gotta run em to know if they are collapsed though).

[93vinx]

so if the spprings isn't bad really the lifter should be ok if its not grooved or ne thing, do they come apart?

[93vinx]

ok so i pulled them apart and the one set sprins up and down
the other does not, the good ones should spring

[CurtsLuminaZ34]

GM posted a fix for lifter noise in the form of a technical service bulletin. It requires some drilling on the cams under the end covers, but the TSB improves oil flow the the "hat" style lifters our cars use. The service kit is suppose to be availible from GM. I will check this week and see if the kits can still be ordered.