1.7 rockers

dirtyred11 · May 21, 2012

Ok, i put the 1.7 rocker arms on my rebuilt motor and i was wondering about the correct way to set them. The person i had help me build the motor adjusted them and all he did was tightened them down pretty good after we had put the entire motor 2gether. I don't know if this is the correct way because this was my first build so im askin will adjusting them this way kill my performance or it doesn't really matter how tight or loose they are??? ALL COMMENTS AND HELP WILL BE GREATLY APPRECIATED.... THANKS

95opal · May 22, 2012

Yes there is a right and wrong way of doing this and from your post I can say your buddy has no idea what hes doing. Depending on rocker style ie...pedestal or stud the procedure is a tad bit different. No Im not gonna break it down for ya as I dont have the time, but google will help ya, you can bank on it.

Venom351R · May 22, 2012

Check out some Youtube videos, sometimes its easier to see it done then have someone try to explain it. There are more steps then just this (before this step). Basicly you want to turn the pushrod back and forth between your fingers as you turn the polly lock. When the pushrod encounters resistance and it becomes harder to turn by hand then you are at 0 lash. At this point you want to give a 1/2 turn more on the polly lock and then lock it down with the screw in the center. Like I said there is more steps to it then this that come in before this point but that is how you actually adjust the rocker once it is in the right position (which are the steps before you get to this). This is the method for stud mount rockers.

OnyxCobra · May 23, 2012

When I did my cobra 1.7 pedestal mount I just torqued them to spec with the engine turned so there was no pressure on the valve.

g36 monkey · May 23, 2012

Is the car cammed?

dirtyred11 · May 26, 2012

yes the car is cammed, it has the trick flow stage 1 cam and if he did it wrong will this hurt my performance or cause problems?

Black96 · May 26, 2012

Straight from comp cam..this is for setting valve lash for hydraulic lifters. When the exhaust valve just begins to open on the #1 cylinder, adjust the #1 intake valve by loosening the adjusting nut slightly while spinning the pushrod until you feel lash in the rocker arm. Tighten the adjusting nut until the slack is taken out of the rocker arm and pushrod. Lightly turn the pushrod with your fingers as you tighten the adjusting nut, and you should feel a point where there is a little resistance. This is called zero lash – the point where you have taken all of the excess slack out of the pushrod. Turn the adjusting nut Â½ turn past this point, giving you optimal pre-load for the rocker arm, pushrod and lifter. Follow this procedure by carefully adjusting each intake valve according to cylinder firing order.Next, we’ll adjust the exhaust valves. To do so, you need to turn the engine over until the intake pushrod moves all the way up. Rotate just past maximum lift, where the intake will begin to close. The lifter is now at the base circle, and the exhaust valve can be adjusted. Note: DO NOT go too far down (over halfway) past the point of maximum lift. If you go too far, you will be in the overlap cycle – where intake valve lash is being taken up as the exhaust valve begins to open.Rotate the exhaust pushrod with your fingers and begin to tighten the exhaust adjusting nut. When you begin to feel resistance against the pushrod, you are once again at zero lash. Tighten the adjusting nut another Â½ turn. DO NOT OVERTIGHTEN. Repeat through the firing order until the lash on every exhaust valve has been set. www.cpgnation.com/.../comp-cams-how-valve-lash-adjustment-2076.html

Venomized · May 26, 2012

If hes running pedestal mount rockers its a totally different procedure.

To the OP, YES it will bend pushrods and keep valves open at the wrong time if you run it the way your buddy tightened them down.

DO IT RIGHT OR DONT DO IT AT ALL!!!!!

LAFENATU · May 26, 2012

Measure, Measure and then Measure again with an adjustable pushrod and get the correct size rod.

ScottyDsntKnow · May 30, 2012

Yeah+1, if you didn't measure for proper pushrod length and just re-used the rods you had or guessed then you have the wrong length pushrods. Also the way your "buddy" did it is completely wrong and you should probably not let him near your car in any mechanical aspect again...

dirtyred11 · May 31, 2012

ok thanks guys, i found out that i have pedestal mount rockers also and how do you measure for push rod length? I just used the old push rods

g36 monkey · May 31, 2012

You are going to have to mark the tips of your valves, and tighten down the rockers correctly, 3/4 turn after zero lash, spin the motor twice, and see where the line is on the tip of your valve. If it's in the center, all should be fine. Repeat for the remaining valves.

OnyxCobra · May 31, 2012

I'm not sure if you necessarily get to zero lash when using a pedestal mount rocker. I don't believe they need to be fully torqued just to check the path the rocker takes on the valve but make sure you use a solid lifter to check it.