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post #1 of 16 Old 08-11-2011, 09:15 AM Thread Starter
R3V413
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Head bolts

Im currently in the process of swapping out my head gasket, should I swap out the head bolts too or use the old ones? I've called the local parts stores in my area and they don't carry em and can't even order em. I even called the dealership and they said that they were discontinued. Should I just install the old ones or keep looking for new ones?


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post #2 of 16 Old 08-11-2011, 09:18 AM
oldtime_ironman
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Some are gonna say yeah and some are gonna say no. I don't think the jeep head bolts are "torque to yield" type. So I would just re-use them and carefully follow the torque method when you do it. Make sure all the threads are absolutely clean first.
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post #3 of 16 Old 08-11-2011, 09:55 AM
Louie4
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I've always re-used head bolts. Now if I had taken the head off a motor multiple times then I might consider but I probably do a head gasket once in the life of the motor. Of course re-using them is not the preferred method but I in my experience it's not a problem.

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post #4 of 16 Old 08-11-2011, 10:04 AM
jbolty
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I have lots of manuals for various vehicles and recall reading in one of them a specific mention of marking the bolts when they were reused and replacing after one re-use.

Of course if you can't get any new ones there your choice is made for you.

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post #5 of 16 Old 08-11-2011, 10:21 AM Thread Starter
R3V413
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Alright guys thanks for the help. Considering I cant find any new head bolts Im just going to resuse the old ones. I called a well known Engine Repair shop about an hour north of me and they said that considering they are not "stretch or torque to yield bolts" that I could reuse em.
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post #6 of 16 Old 08-11-2011, 11:39 AM
yellowlabs
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i was wondering the same thing. I pulled the head the other day to replace the gasket and took the head to a machine shop to have it checked. I was wondering what the torque specs on the bolts were. Is there any thing special I need to do?
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post #7 of 16 Old 08-12-2011, 12:12 AM Thread Starter
R3V413
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Quote:
Originally Posted by yellowlabs View Post
i was wondering the same thing. I pulled the head the other day to replace the gasket and took the head to a machine shop to have it checked. I was wondering what the torque specs on the bolts were. Is there any thing special I need to do?
Here you go:

http://www.jeepforum.com/forum/f12/y...12/index3.html
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post #8 of 16 Old 08-12-2011, 02:55 PM
wendell
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You can reuse head bolts if there still in good shape. However I know there is new head bolts to be had for the 258. There's several places that sell remanufactured 4.2's that have new head bolts, like ATK, jasper and golens. I would give Quadratec and 4wd hardware a call as well as collins brothers if you really want new.

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post #9 of 16 Old 08-13-2011, 07:09 AM
nembudonna
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You can order new ones online for $20.00 delivered.
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post #10 of 16 Old 08-13-2011, 05:03 PM
sptrmike
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i did my 89 4.2 engine last winter,i got new head bolts from head bolts.com i think it was 45.00 with shipping
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post #11 of 16 Old 08-13-2011, 10:03 PM Thread Starter
R3V413
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I just reused the old ones after tapping the holes to clean em and dying the bolts to clean as well. I would of ordered new ones but the guys shop that im using only gave me a week. It sux not having a ur own garage ....lol

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post #12 of 16 Old 08-14-2011, 06:26 AM
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If the 4.2 is the same as the 4.0 in this regard, the manual says that you can re-use them ONCE and then you need to replace.

Again, if the 4.2 is the same/similar to the 4.2, the front drivers side head bolt will have a special torque condition - the bolt hole on the block goes into the water jacket and has a slightly lower torque value listed along with a cautionary note not to overtorque - you can strip the threads from that hole.

Get a tightening sequence and description - pull the head down in the right sequence in 3 to 4 stages to get a good & flat seal of the head to the block.
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post #13 of 16 Old 11-17-2015, 12:42 PM
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I am trying to find some head bolts for my Jeep Cherokee Pioneer 86 2.5L 4WD 5spd
Are the head bolts on the 4.0L the same as the 2.5L?
I live in Bolivia so I do not wanna order the wrong bolts.
I would greatly appreciate any info.
Thanks
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post #14 of 16 Old 11-17-2015, 01:43 PM
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Here is what the 1987 parts manual (YJ/XJ) has for head bolts for a 2.5l. Different in 1986, I don't know. Maybe someone will weigh in. You could post in the XJ section for further help.

Pc 8 J400 7308 qty 5 BOLT 3.75"
Pc 9 J400 7307 qty 1 BOLT 4.52"
Pc 10 BOLT, Stud
J400 7310 qty AR 1.00"
J400 7311 qty AR 1.38".

I'm not sure why there is a difference in pc 10, bolt stud, you will have to measure yours.
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post #15 of 16 Old 11-17-2015, 05:29 PM
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Quote:
Originally Posted by paulsadog View Post
Here is what the 1987 parts manual (YJ/XJ) has for head bolts for a 2.5l. Different in 1986, I don't know. Maybe someone will weigh in. You could post in the XJ section for further help.

Pc 8 J400 7308 qty 5 BOLT 3.75"
Pc 9 J400 7307 qty 1 BOLT 4.52"
Pc 10 BOLT, Stud
J400 7310 qty AR 1.00"
J400 7311 qty AR 1.38".

I'm not sure why there is a difference in pc 10, bolt stud, you will have to measure yours.
The stud bolt is the one the engine to body ground gets bolted to. I picked up my new bolts at advanced auto for $13, but that was for the 4.0l.

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