Have to replace a valve any suggestions?

[Jbrogan]

I have bent the valve on my number 2 cylinder. At least it is in the front head.

Does anyone know anything that would help me out?

[gectek]

how did you diagnose it being bent?

[Jbrogan]

car is running wierd. sounded like it was running on 5 cylinders. i chacked the compression on the #2 cylinder and it was 10 psi. when i was changing my rocker arms i didnt have a push rod int he lifter all of the way and it bent the push rod and im assumin that it bent the valve. it was the intake valve though so I dont know if the piston hit it.

[gectek]

well looks like u will have to pull ur head, look on the bright side, at least its on the front one. so that means pull the UIM, LIM, and all that other good stuff, and if its like my 3400 GA, u have to basically take the power steering pump off the block to get to the diagonal LIM bolts-should be 2 of em. plus the ones under the TB on the other side. so now might be a good time to also change out the LIM gasket, cuz they have the tendency to leak. I did that this last weekend...uh i wouldnt wish that on anyone. so now all u need is a butt load of RTV doesnt hurt either. and make sure when the head comes off to take the pushrods off and keep them in order, very important. so yah, if that sounds like too much i would def let someone else do it. oh yah then you can either do the valve work yourself or just take it to a machine shop...since i have little time and possibly not the right tools for thati would take it to the shop, but thats just me

[Jbrogan]

thanks for the info. so was it a really hard job? and was there any problems that you encountered?

[gectek]

yah, use plenty of silicon, drain the water and oil, take off the piping from the heater core to the top of the water pump, makes things easier and is out of the way first. so then just check and clean everything you see, to get all the nasty sludge off, but keep things where they came from... i.e. lifters, pushrods, rockers...etc. the LIM may come off with the two top bolts of the back vavle cover off but if i dont then u might have to loosen or remove the alternator. if you need further help i have all the procedure, but its easier to get a sub. to an online repair manual like alldatadiy.com, its good and its not exspensive

[Jbrogan]

Why do the lifters and rockers have to go back in the same place when they are all the same?

[gectek]

due to the specific wear pattern on the parts, so keep all the pushrods, rockers, and lifters (if you pull them to check them out) they all need to go back just like u pulled them out.

[Jbrogan]

I have already pulled them out and put them in different spots. what about the 3100 rockers? do they go in a specific place?

[Joseph Upson]

If they are roller lifters you should be okay if they are mixed up, otherwise cam manufacturers would not suggest their reuse on new cams. If it's hydraulic flat tappet they'll need to be replaced due to the tapered wear pattern they develop during use.

[Jbrogan]

they are not roller tip. they are off of a 3100 from the junk yard. what will happen if i replace my stock rocker arms with these rocker arms from the 3100. i know the lift is 1.6:1 and it will increase horsepower, but if i use these used rocker arms will it make it run different or what.

[KCFITZ78]

I have a 1994 gp 3100 SFI and now i have a really rough idle. I did not pay attention to the push rods. There are two different lengths, one for intake and another for the exhaust. I have the correct sizes in the right location just not back in the prior location before tear down. Should I have bought all new rods and new rockers? Could this be why it runs like piss? If so anyone know where to buy these from for a good price?

[Jbrogan]

if the pushrods are mixed up but the right lengths are in the right spots it should run fine. it is recommened that you puthem all back in there original places due to wear patterns but it should run fine. maybe you still have one in the wrong place. the intake pushrods are marked orange.

[KCFITZ78]

My pushrods are yellow and green. There is no paint on the pushrods do to the 143k miles. I went to my local dealership and had them look up the two different lenghts. They also had the colors for the differnet lenghts. There are plates with engraved letters on the heads marked y & g for my engine. These are markings for the rods. I doubled checked the rods and retorqued each rocker arm. So maybe just a vaccum leak. Still need to vaccum test. I have another thread about my problem so i was just asking about the rods. I didn't see any visaul wear or difference in the rods or rockers.