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Dan
Dan, ASE Certified Technician
Category: Jeep
Satisfied Customers: 1655
Experience:  Auto Technician
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I need to set the lash on my valves, No i just replaced my

Customer Question

Hi i need to set the lash on my valves
JA: How many miles are on the car? Have you noticed any leaks lately?
Customer: No i just replaced my head gasket and need to reset my valve lash
JA: What is the model/year of your Jeep?
Customer: 01 jeep grand cherkee 4.0
JA: Are you fixing your Grand Cherokee yourself? What have you tried so far?
Customer: I am. I just need to set my valve lash i cant seem ti find it anywhere
JA: Anything else you want the mechanic to know before I connect you?
Customer: No thank you
Submitted: 7 months ago.
Category: Jeep
Expert:  Dan replied 7 months ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.

Expert:  Dan replied 7 months ago.

All 4.0L engines use hydraulic lifters, so no adjustments are required.

Expert:  Dan replied 7 months ago.

Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.

Thanks

Customer: replied 7 months ago.
Well i removed my head so i need to know what to set them to
Expert:  Dan replied 7 months ago.

They will pump up with oil pressure, no need to set them.

Customer: replied 7 months ago.
do i just tighten them down with no order? Whats the torque.
Customer: replied 7 months ago.
I had completely removed my rockers to get the push rods out. I dont know how much to tighten them down.
Expert:  Dan replied 7 months ago.

rocker arm

Installation

  1. Install all reused components into original locations. Ensure bottom ends of push rods are centered in valve lifters. Lubricate pivot contact area of rocker arms with MOPAR Engine Oil Supplement (4318002). Install cap screws loosely, and then tighten alternately (one turn at a time) to specification. See TORQUE SPECIFICATIONS .
  2. Reverse removal procedure to complete installation. Pour remaining engine oil supplement over entire valve train. Supplement must remain in engine oil for at least 1000 miles. Refill cooling system. Adjust ignition timing. Check for leaks.
Expert:  Dan replied 7 months ago.

Rocker arm bolts are 21 ft lbs.

Customer: replied 7 months ago.
Ok i have them set to 21 ft lbs. Whats the sequence to tighten them down?
Expert:  Dan replied 7 months ago.

There is no sequence just alternate.

Customer: replied 7 months ago.
I had already put it all back together earlier today. Wen to start it and it was wide open. My only thaught was maybe the valves are open to far. But i hadnt done anything with the timing
Expert:  Dan replied 7 months ago.

If the valves were open too far you would have no compression. This sounds like you have a vacuum leak.

Expert:  Dan replied 7 months ago.

Did you put all rockers and push rods back in the same spots?

Customer: replied 7 months ago.
As soon as i start it it revs up to 3500 RPM
Customer: replied 7 months ago.
Rockers yes. Rods no. I didnt think it would effect it to much
Expert:  Dan replied 7 months ago.

The pushrods should be the same lengths.

Customer: replied 7 months ago.
They are i made sure of that
Expert:  Dan replied 7 months ago.

Check for vacuum leaks after the throttle body, this would cause a high idle.

Customer: replied 7 months ago.
Thats a high idle haha
Expert:  Dan replied 7 months ago.

Disconnect the cruise control. I have seen this cause your issue as well.

Customer: replied 7 months ago.
Where does this connect?
Expert:  Dan replied 7 months ago.

Connects to the throttle body. There should be 2 cables. One for the pedal and one to the cruise actuator, follow the throttle cables.

Expert:  Dan replied 7 months ago.

To the cruise actuator and disconnect the connector.

Customer: replied 7 months ago.
There are 3 cables. One goes up to my firewall where my dash is. One goes down under my battery box and the other leads down over my trans
Customer: replied 7 months ago.
The one under the battery box has a connector on it. Im trying to diconnect that now
Customer: replied 7 months ago.
Now if i just un hook the cable wouldnt that be the same as taking out the connector?
Expert:  Dan replied 7 months ago.

Yes

Expert:  Dan replied 7 months ago.

You could also unhook the cable.

Customer: replied 7 months ago.
There was no change. I double checked the other connectors and vaccumes
Customer: replied 7 months ago.
As well
Expert:  Dan replied 7 months ago.

Check the idle air control valve if may be stuck open.

Customer: replied 7 months ago.
Where is that loctated?
Expert:  Dan replied 7 months ago.

On the throttle body it has a 4 pin connector on it.

Customer: replied 7 months ago.
Which one is it?
Expert:  Dan replied 7 months ago.

The one on the bottom in the picture.

Customer: replied 7 months ago.
Customer: replied 7 months ago.
If so how do i tell if its stuck open?
Expert:  Dan replied 7 months ago.

You have to unbolt it. Use throttle body cleaner to clean the passage way.

Expert:  Dan replied 7 months ago.

Yes you pointing at the idle air control valve.

Expert:  Dan replied 7 months ago.

You have to unbolt if to check it, also clean it with throttle body cleaner, and clean you throttle plate as well.

Customer: replied 7 months ago.
All i have is brake cleaner. That will be fine right?
Expert:  Dan replied 7 months ago.

Yes that will work.

Customer: replied 7 months ago.
What do you think?
Customer: replied 7 months ago.
that plug moves in and out?
Expert:  Dan replied 7 months ago.

That looks stuck open. It should move in and out as the motor turns, but it should be closed when you remove it.

Customer: replied 7 months ago.
It wasnt running like that before i took tge head off. I dont think that would have just so happened to get stuck. Its gotta be something i did wrong with the valve lash
Expert:  Dan replied 7 months ago.

If the valves were stuck open you would have no compression, therefore the engine would misfire. A compression test would verify this.

Customer: replied 7 months ago.
the valve lash has nothing to do with the high idle? Nothing at all. Maybe the throttle position sensor went?
Expert:  Dan replied 7 months ago.

Do you have any codes?

Customer: replied 7 months ago.
Im not letting it stay on it hits 3400 RPMs and climbs.
Customer: replied 7 months ago.
Within 2 seconds. Itll blow it up
Expert:  Dan replied 7 months ago.

If you have a hard code it would set right away. A throttle position sensor would cause a code, and would not cause the engine to rev, a vacuum leak that is acting like the throttle plate being open like the IAC valve being wide open would cause this.

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