Torque specs jeep 4.0 head bolts

Q: What happens if head bolts are not torqued properly?

If the head isnt torqued down properly, then the most likely failure is of the head gasket, which could lead to loss of compression, the mixing of oil and coolant, exhaust gases getting into the oil ways or cooling channels, erosion of the cylinder head, overheating and warping of the cylinder head.

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Head torque Sequence
Re: Head torque Sequence
Re: Head torque Sequence
Re: Head torque Sequence
Who is online
What is the torque specs for head bolts?
How much torque does a head gasket need?
What is the sequence for tightening head bolts?
What happens if head bolts are not torqued properly?

shockcocker04Making Progress

Posts: 62Joined: December 12th, 2008, 2:16 pmStroker Displacement: 4.7LLocation: Maryland

Head torque Sequence

Does anyone have a torque diagram for a 2001 4.0 cylinder head? I know there is a couple different steps, also the placing for the head bolts by number.
I just installed my 5.9 magnum springs and i am putting my head on tomorrow.

Thank you, Bryan

Muad'DibSite Admin / Owner

Posts: 1496Joined: January 8th, 2008, 10:55 amStroker Displacement: 4.7LVehicle Year: 1990Vehicle Make: JeepVehicle Model: CherokeeLocation: Bend, Oregon Contact:

Re: Head torque Sequence

Post by Muad'Dib » March 16th, 2009, 9:11 am

5-90 on NAXJA wrote:PTFE pipe dope (Or high temp thread sealant) on the driver's side front head screw (#11). Final torque for that screw is 100 pound-feet, and 110 pound-feet for the rest.

Standing on the driver's side, the torque sequence is to start on the driver's side centre, go to the passenger side centre, and work out from there in a clockwise spiral. I torque to 25-50-75-final pound-feet, and haven't had any trouble (I know it's more than the manual says to do, but I'm cranky.)

If it feels right, then STROKE it!

You're lucky that hundred shot of CAPS LOCK didn't blow the welds on the forum!!

BodoDonator

Posts: 247Joined: July 31st, 2008, 12:28 pm

Re: Head torque Sequence

Post by Bodo » March 17th, 2009, 7:08 am

Along the same lines

I didn't pay much attention to the headbolts when I tore my donor engine down. I did notice that the new headbolts have 2 or 3 different kinds of bolts (lengths and styles). Is there a cheat sheet to show which kind if bolt goes where?

SilverXJGlobal Moderator

Posts: 5788Joined: February 14th, 2008, 7:14 amStroker Displacement: 4.6LVehicle Year: 2000Vehicle Make: JeepVehicle Model: CherokeeLocation: Radford, Va

Re: Head torque Sequence

Post by SilverXJ » March 17th, 2009, 7:42 am

The longer ones with the stud ends go outside the valve cover. Using the image above that would be 14, 10, 6, 2, 3, 7, 11. The shorter ones with the dowel pins on the head for the valve cover gasket go to 8 and 9 IIRC. Check your valve cover gasket to be sure, if it is of that type. Fill the remaining holes with the short ones with the regular head.

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2. Position the engine cylinder head gasket (with the numbers facing up) onto the cylinder block.

CAUTION: Engine cylinder head bolts should be reused only once. Replace the head bolts if they were used before or it they have a paint dab on the top of the bolt.

Fig. 6 Engine Cylinder Head Assembly

3. With bolt # 14 held in place (tape around bolt), install the engine cylinder head. Remove the tape from bolt # 14.
4. Coat the threads of stud bolt # 11 with Loctite (TM) 592 sealant, or equivalent.

Fig. 7 Engine Cylinder Head Bolt Tightening Sequence

5. Tighten the engine cylinder head bolts in sequence according to the following procedure Fig. 7 :

1. Tighten all bolts in sequence (1 through 14) to 30 N.m (22 ft. lbs.) torque.
2. Tighten all bolts in sequence (# 1 through 14) to 61 N.m (45 ft. lbs.) torque.
3. Check all bolts to verify they are set to 61 N.m (45 ft. lbs.) torque.
4. Tighten bolts (in sequence):

o Bolts # 1 through 10 to 149 N.m (110 ft. lbs.) torque.
o Bolt # 11 to 13 N.m (100 ft. lbs.) torque.
o Bolts # 12 through 14 to 149 N.m (110 ft. lbs.) torque.

CAUTION: During the final tightening sequence, bolt # 11 will be tightened to a lower torque than the rest of the bolts. DO NOT overtighten bolt # 11.

5. Check all bolts in sequence to verify the correct torque.
6. If not already done, clean and mark each bolt with a dab of paint after tightening. Should you encounter bolts which were painted in an earlier service operation, replace them.

There you go.

What is the torque specs for head bolts?

Tighten each bolt to 12-15 foot pounds of torque.

How much torque does a head gasket need?

Torque all bolts to 45-55 ft. lbs. (61-75 Nm.). Finally, tighten all bolts and studs an additional 1/4 turn (85-95°).

What is the sequence for tightening head bolts?

Normally you would tighten conventional head bolts in a crisscross pattern in three steps, to one-third, two-thirds, and then to the final torque. Stretch bolts are tightened in a torque-plus-angle sequence.

What happens if head bolts are not torqued properly?

If the head isn't torqued down properly, then the most likely failure is of the head gasket, which could lead to loss of compression, the mixing of oil and coolant, exhaust gases getting into the oil ways or cooling channels, erosion of the cylinder head, overheating and warping of the cylinder head.

torque specs jeep head bolts