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Head Bolts Stuck?

 
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  #1 (permalink)  
Old 24 Jun 2019, 01:12 pm
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Join Date: Feb 2016
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Default Head Bolts Stuck?

I am at the point of removing the bolts from the head to the block. The bolts seem to be stuck. Each bolt moved slightly, like a half a MM, but now I can't get them to budge.

I don't want to break one off in there.

I'm surprised, because I thought with all the oil in here it wouldn't be stuck.

Do I need to use a breaker bar?

(Don't want to break a bolt!)
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Old 24 Jun 2019, 04:30 pm
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Default Re: Head Bolts Stuck?

Try tightening the bolts a little first, then reverse them. I never had to remove the head on my GT, but always used a breaker bar when loosening head bolts in the past on other engine rebuilds.
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Old 24 Jun 2019, 04:37 pm
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Default Re: Head Bolts Stuck?

Quote:
Originally Posted by chuzz View Post
Try tightening the bolts a little first, then reverse them. I never had to remove the head on my GT, but always used a breaker bar when loosening head bolts in the past on other engine rebuilds.
Yup, back and forth, back and forth, and back and forth, until they release. That's a tip from my brother, the long time mechanic. It's the first go-to for a stuck bolt.
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Old 24 Jun 2019, 04:42 pm
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Default Re: Head Bolts Stuck?

OK, I'll give that a whirl, thanks guys.
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Old 24 Jun 2019, 09:06 pm
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Location: Phoenix AZ
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Default Re: Head Bolts Stuck?

the head bolts need to be removed in reverse of the tightening sequence. which should be (don't quote me) the passenger side towards the rear first, then move in a counter clockwise order till you reach the center. to avoid damage I get them all to chirp first, then start over and do a 1/4 turn, then after that have at it. breaking head bolts out of order will put too much stress on the wrong bolts.

someone correct me but the first bolt torqued from the factory should be center forward or rear (as you look at the compartment)

edit- they probably are not stuck. these head bolts (from the factory) are diesel engine tight... trust me, reverse is the trick
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Last edited by rambojoe; 24 Jun 2019 at 09:09 pm.
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Old 25 Jun 2019, 12:45 am
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Default Re: Head Bolts Stuck?

Use an impact gun
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Old 25 Jun 2019, 02:53 am
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Default Re: Head Bolts Stuck?

First, I'd recommend buying a Haynes PT repair manual. $20 - $30 bucks. They have a nice diagram for the 4.72" dimension. Or search this site for that or 119 MM dimension.

You can use a beam type 1/2" drive torque wrench to remove the headbolts. They should break loose before 70 foot pounds. Rambo Joe's reverse order sounds good to me. And the 1/4 turn deal.
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Old 25 Jun 2019, 08:27 am
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Default Re: Head Bolts Stuck?

Quote:
Originally Posted by rambojoe View Post
the head bolts need to be removed in reverse of the tightening sequence. which should be (don't quote me) the passenger side towards the rear first, then move in a counter clockwise order till you reach the center. to avoid damage I get them all to chirp first, then start over and do a 1/4 turn, then after that have at it. breaking head bolts out of order will put too much stress on the wrong bolts.

someone correct me but the first bolt torqued from the factory should be center forward or rear (as you look at the compartment)

edit- they probably are not stuck. these head bolts (from the factory) are diesel engine tight... trust me, reverse is the trick
I never heard of this before. It doesn't matter about "stress" on the old head bolts. They are torque to yield, meaning that they should not be reused. New head bolts are needed when doing this job.

As far as getting the old ones loose, use a bigger breaker bar or an impact gun. IMO, never use a torque wrench to remove bolts. When they "snap" loose you could possibly affect the accuracy of the tool.
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Old 25 Jun 2019, 09:46 am
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Default Re: Head Bolts Stuck?

not many consider this but meticulous 2-stroke and aircraft engine builders do.
its all about sequence to not damage the aluminum. and a 4 cyl head will twist.

the torque can increase in some applications if disassembled in the wrong manner. you know the hydraulic breakers on track hoes? (the ones you can feel a mile away- usually on sunday morning...) those head bolts are 1000+ftlbs. ive found if you crack the last bolt torqued last and there is any twist on the head, it is twice as hard to get it loose, as well as ruining the studs. motorcycle heads are the same way. im not saying folks should do it this way, its just the way I do it.


wheel stud bolts are the same now that I think about it... have you ever torqued the bolts then crack them to rotate a year later? some can seem loose and one seems to be waay too tight? how insane am I? yes, one of my stud bolts have a sharpie dot on them....#1. :0

and for god sakes, I agree. never use a torque wrench as a breaker bar!!
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Old 25 Jun 2019, 12:19 pm
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Join Date: Feb 2016
Posts: 63
Default Re: Head Bolts Stuck?

OK, lot of good info here, it's helping.

One question I have, is from rambojoe, where you say:

Quote:
"I'm not saying folks should do it this way, its just the way I do it."
I don't understand your steps well enough to know what you mean? How do you do it?
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