wpreston1990

1 rocker arm on my passenger side keeps coming off the pushrod 1995 z28

shoebox

If there are no valve, rocker arm, stud or spring issues evident, it is possible you have a collapsing lifter. You should also make sure the pushrod is not bent.

wpreston1990

the push rod is fine i replaced it the first time it came off but the rocker looks fine and when i hook it back up it cranks up and runs fine until it comes off again it has come off 3 times now. if it is the lifter whats the easiest way to replace it.

jloshotz

Pull the intake, with the ignition disabled, first turn the engine over to be sure you are getting full travel on the lifter. (Compare visually to the others) If the travel is ok, the cam lobe should be ok too. Being a roller camshaft, wear is typically non existent, so long as a cam bearing hasn't spun. If the travel looks ok, as shoebox mentioned, just r&r the lifter. Personally, I'd replace the whole set, as they aren't too expensive, and there may be another soon to follow. Also recheck the pushrod, there's no telling what may have happened to it when the rocker jumped ship at xxx RPM's.

wpreston1990

is there any way i can replace the lifter without removing the intake

jloshotz

Not a chance sir. It really isn't that difficult though, just take your time

wpreston1990

is there anything i need to do to the lifters to get them ready to go in the engine or can i just put the in as is

jloshotz

You should soak them in a coffee can of fresh oil for a day or so to help fill them up prior to install

wpreston1990

i think i have found my problem the pushrod hole has expanded to about the size of a nickle could the lifter cause that

jloshotz

When you say "pushrod hole" the only thing I can think you might mean is the punch out in the head gasket that the pushrod goes through....if my thinking is correct, that probably only happened from the previous malfunctions. Is this the hole of which you speak?

wpreston1990

its the hole where the pushrod goes down to the lifter u know how they are usually about the same size as the pushrod well this one is about the size of a nickel i ordered a pushrod guide plate but i still need to know why that hole was streched out like that

jloshotz

Post a pic if you can

shoebox

Well, you can't just go and throw a guideplate on there. It does not work that way. Stock rockers don't use guideplates. While I don't really understand what the situation is with the hole, it has no bearing on guiding the pushrod. It's just a hole for it to pass through to get to the rocker arm.

wpreston1990

well i replaced the rocker arm and pushrod and it hasnt come off yet but one came off on the driver side of the engine so im going to replace the rest of the rocker arms and hopefully that fixes my problemes but if not ill have to change the lifters and if that dont work i heard it could be my cam wearing out but i dont know how to tell if my cam is wearing out. how much would it cost to put it in a shop and have the lt4 cam, new rocker arm, pushrods, and lifters put in.