12 valve help!!
 

Got a 95 12 valve I recently completed a head gasket on. It'll spin over till you start adjusting valves then it won't budge. Anyone ever had this happen before?:argh:

Is it possible you've not got a push road seated correctly? If its not in the tappet it'll bend the push road and possibly damage the valve. Or you've got your lash way to tight. Forgot to ask, what was shaved off the head and what gasket was used?

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I had everything set by finger and it ran its course perfectly. I don't get what happened. We started adjusting valves and tried to spin it over to finish it and it like "locked" up. Can't go forward or back. I had a couple mess ups along the way with push rods not being completely in but i addressed all those along the way. Like I said, it worked perfectly with the valves all lashed by feel and not tight

By feel? I think I would go back over the pushrods and valve lash with a fine tooth comb and a set of feeler gauges. If it turned fine at first and you changed your lash and it stops turning over seems like a logical places to start. If it was valve lash you would think it would go back? Maybe a timing pin left in? Or barring tool left in the bell housing? Didn't have cam out did you?

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No, Cam wasn't out, been turning it over with the balancer, used a method I read about on here for setting TDC so I didn't use the timing pin. I set everything by feel so I could get everything together and make for sure it didn't bind or anything. And all was well until I started setting lash with the feelers gauge.

You might loosen them and make SURE you are at tdc but it really shouldn't matter as long as you're on the bottom of the cam.

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Would that make them bind forward and back?

No. Lol
Hydrolocked by something but that would not just appear because of tightening the lash. Could you have accidentally adjusted one of the wrong valves at tdc? Heck who knows maybe the bad luck fairy stopped in and dropped the kdp.

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Sounds like you adjusted the valves 180 out. Take and loosen every single rocker completely off. If it spins freely your good to go. Now to set the valves, find top dead cylinder by pushing the lock pin on the back of the timing cover between the vacuum pump and injection pump. When you first push it in it will move. But 99.9% chance you won't have it perfectly at TDC. Rotate motor till it pushes in. Set the correct valves. Now you will need to rotate the crank 360 degrees. Easiest way is to mark the balancer and rotate the engine clock wise till the mark is in the exact place and the adjust the rest of the valves.

That was my initial thought but even if he left the adjusters all the way loose it would open the valve enough to prevent adjustment I would think.

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Adjusters backed all the way off they won't push the valve at all or shouldn't

I've got one at the shop. I'll look monday , I've done hundreds of em and I honestly remember that backed all the way down they atleast come up enough to put pressure on the push rod. Then again I never back them all the way down.

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It's been over a year since I've worked on one now that I work in sales. But even if it just barely pushes it down it would be the right cylinder it's pushing since the am wasn't removed


Back from the forum grave

Right, I'm just saying that if you're at tdc, the lift is high enough on the cam to prevent adjustments on the set that's adjusted at bdc. Even with the adjuster all the way out them cam would atleast put slight tension on the pushrod. Atleast I think. I may be wrong lol.


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When I put it together I put each pair of rockers and push tubes in 1 cylinder at a time from front to back. I back each set off to closed on the engine then set each pair with just enough lash to hold everything in place while i rotated the engine over on the balancer. Then went back and started lashing valves. It spun over fine like that. I'm left to assume its valve lash. But even so, it only made a 1/4 turn on the balancer before it "locked up" and the adjusted valves have barely if at all began to move.

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Ok, so I went ahead and backed off all the valves. Still won't budge. I can spin all the push tubes freely in the head. I really hope I don't hafta pull the head. I Pulled it once already for this issue and I really hope I won't hafta do it again.

For this issue? Are you sure you don't have a kdp issue or something unrelated to the hg job?

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I believe I found cylinder 6, intake valve to be the problem. I double checked everything and found it was still adjusted. I loosened it and get about another 1/4 turn out of it and it looks like that valve is open again. But I don't understand why its doing this. Could a push rod be binding up? Prev owner said the KDP was killed. I'm hoping he wasn't BSing

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Ok, got the thing spinning over again. I'm going off the bolts on the balancer, is it normal for it to be kinda tight? Could it just be because the valves aren't opening fully?:argh:

It will be tight even with them open fully when you come up on a compression stroke. When you loosened number 6 did it start moving?

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Yup, got it moving again. I really don't get what its issue is. I called a shop today (he checked the timing in the truck when I first got it) and he said I should go off the valve cross method. I'm gonna try that tonight when help arrives. I hope this solves the final problem and I can get this ole girl fired up. :tu:

Welp, got the heap running a couple days ago. Runs ok. Now if only I could keep the intercooler boots on...........