95 3.4L 0* timing mark?

[TopHatJimmy]

I had a good leak from the lower intake manifold so this weekend i tore the top end of the motor off to fix it. Didn't know I had to remove the rockers and pushrods to change the lower intake to head gaskets - my repair manual made no mention of that part. BOO.

When i put the pushrods and rockers back on, my book said to align the crank to 0* TDC on cyl #1 to adjust half the valves and then turn the crank once around back to 0* and adjust the other half.

Where the hell is the 0* mark to line up with, I can't find one anywhere. My book only makes a mention of it - it doesn't say where it's at.

[3.4 slow to go]

Re: 95 3.4L 0* timing mark?

you'll need to pull the plug on the #1 cyl & rotate the crank until the piston is tdc. the fun part is that it could be 180*s out (found this out when I did the 2.8~3.4 swap boogie on the old bird).

[tkoforpresident]

Re: 95 3.4L 0* timing mark?

you'll need to pull the plug on the #1 cyl & rotate the crank until the piston is tdc. the fun part is that it could be 180*s out (found this out when I did the 2.8~3.4 swap boogie on the old bird).

while you can do it this way, there is a better one.

take your LIM off (would have been easier to do this before putting it on again)

and look at the lifters. find cylinder 1, which is the closest to the front of the engine bay on the drivers side.

now spin the crank til both lifters are even and as low as they can go. u are now at tdc for cylinder # 1 and you can do half of the tightening now (refer to haynes manual for specific ones to tighten at this step.)

then spin it another full rotation and do the other half of them. should be about 4 threads left on the rocker studs if you did it right.

[TopHatJimmy]

Re: 95 3.4L 0* timing mark?

what would be the consequences of it being 180* out?

My dad and i just went ahead and went for it. we turned the crank until both #1 intake and exhaust valves were up and the rest of the valves were in position to be adjusted as my manual said.

It keeps saying to line up the mark on the crank to the 0* on the mounting tab. Stupid book.

Anyway here's what we did. From the starting point, the pushrods of exhaust 1, 2 & 3 could be spun as well as intake pushrods of 1, 5 & 6.
Then one full turn the exhaust pushrods of 4, 5 & 6 and the intake pushrods of 2, 3 & 4 could be spun.
We took everything apart and then used this to reinstall and adjust everything. My book says to adjust, you tighten just until the lash is removed (can't wiggle or spin the pushrod anymore) the tighten 1 1/2 more turns.

We did this, got everything reassembled and fired it up. It runs, no codes, but it has a slight lope at idle it never had before. It runs good, no stuttering or misfiring, just the lope.

I'm going to hook it up to my buddies Mac Tools scanner to see it the vaccuum, timing and whatnot at idle are within factory spec.

**Also I was reading on here that a lot of guys with 3.4L's have issues with the EGR throwing codes when decelerating from 60+. Mine was doing the exact same thing so while I had the upper intake off, i cleaned out the EGR passage and Dear Lord! it was completely packed full of carbon crud. i mean SOLID. So I cleaned all that out and no more codes!!! So if any 3.4L guys are having this problem, take off the upper intake, remove the square drive bolt on the underside of the plenum and clean that puppy out.**

[TopHatJimmy]

Re: 95 3.4L 0* timing mark?

and look at the lifters. find cylinder 1, which is the closest to the front of the engine bay on the drivers side.

My dad and i thought that too, but according to both my manual and the spark plug wires #1 is the frontmost cyl on the pass side.

According to the repair manual it is like this:
Back
5 6
3 4
1 2
Front

???Is that right???

Confused us too......

[tkoforpresident]

Re: 95 3.4L 0* timing mark?

My dad and i thought that too, but according to both my manual and the spark plug wires #1 is the frontmost cyl on the pass side.

According to the repair manual it is like this:
Back
5 6
3 4
1 2
Front

???Is that right???

Confused us too......

dude, i was pretty ****ing sure it is the other way around.

but either way, when i did that and my car sounded like it had a nice cam lope to it, i had the valves adjusted wrong and had to take it all apart and do it up again so make sure u do it right.

i'm not gonna lie, i still don't totally understand the process , in fact i kind of cheated the second time around, my uncle from gm came over and made sure i did it right.

[TopHatJimmy]

Re: 95 3.4L 0* timing mark?

crap...not what I wanted to hear.

Well the next weekend is only 6 more days away......

wait a sec. looking at my Chiltons book now. it shows the coil packs in this order, from left to right. 1/4, 6/3, 2/5.

That's how they are on my car and the 1,3 & 5 wires go the the pass side. Got an illustration that shows that too.....

[tkoforpresident]

Re: 95 3.4L 0* timing mark?

crap...not what I wanted to hear.

Well the next weekend is only 6 more days away......

wait a sec. looking at my Chiltons book now. it shows the coil packs in this order, from left to right. 1/4, 6/3, 2/5.

That's how they are on my car and the 1,3 & 5 wires go the the pass side. Got an illustration that shows that too.....

sorry to scare u, i just checked the haynes manual, u are correct.

my memory is prlly a bit shady.

either way, find that cylinder and get it at tdc bylooking at the lifters and then u can tighten down half the valves and then rotate it again and do the other ones... like i said 4 threads showing is a good sign.

[TopHatJimmy]

Re: 95 3.4L 0* timing mark?

Dang didn't want to have to tear all of it down again. Pain in the ***.

Question: if I take it all apart again, will i have to replace the intake man. to head gaskets or can I leave em on there since they're brand new?

OR

Can I do this without taking off the LIM? Can i just watch the rockers instead of the lifters?

[tkoforpresident]

Re: 95 3.4L 0* timing mark?

Dang didn't want to have to tear all of it down again. Pain in the ***.

Question: if I take it all apart again, will i have to replace the intake man. to head gaskets or can I leave em on there since they're brand new?

OR

Can I do this without taking off the LIM? Can i just watch the rockers instead of the lifters?

if you don't take off the LIM you will have to take out the spark plug and stick a screw driver in there to see when the valves are all the way down or some ****, i didn't do it that way. theres only a couple of bolts holding that LIM on, its worth it to take it off, and if they are new gaskets i would just reuse them but make sure to put alot of rtv on the rear and front of the cam valley.

[cam98aro]

Re: 95 3.4L 0* timing mark?

if you are 180 out, then that only means you can just adjust the other rockers

all you need to do is turn the crank, and watch the rockers, once they are both at their normal position (with the valve closed) tighten them, and go and spin the pushrods the ones you can spin can also be tightened

the 3.4l engine has number one cylinder on the left (pass side) while the 3.8l has the traditional number 1 on the drivers side

and if you torqued everything down you cannot reuse the gasket.. or at least i wouldnt recommend it

edit* just to make sure, but you are putting the rockers and lifters back to their original spots, correct?

[tkoforpresident]

Re: 95 3.4L 0* timing mark?

edit* just to make sure, but you are putting the rockers and lifters back to their original spots, correct?

on some cars this is important, but from what i understand it's not that important on our cars.

[notsonic]

Re: 95 3.4L 0* timing mark?

TDC isnt the best way to adjust valve lash.

http://www.chevyhiperformance.com/te...nfo/index.html