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Old 10-14-2007, 10:44 AM   #1
sl2clone
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Default head bolt torquing issue

I just put a 97 DOHC head on a 2000 SOHC block. I torqued down all the bolts in sequence and it seems 1 is WAY tighter than the rest and some seem kinda loose. Is that normal with this 22 , 37 then additional 90 degress bull? That just doesn't seem accurate. I set my tq wrench to 70 ft/lbs and checked each one. The front bolt in the center is tighter than that. A few other were around 60 and the rest were below that. Is this going to work? ANd if I turbo charge it , will this cause it to blow out? Engine repair is something new to me. I usually don't tear into engines at all. Just replace them. But I got a good block with 115K miles and a good head with 110K miles on it. If it runs it should be a good running non smoker. If I got the timing marks correct. Noe of those seemed to want to line up exactly either. They did on the old block.

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Old 10-14-2007, 12:23 PM   #2
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Default Re: head bolt torquing issue

Did you use new bolts?

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Old 10-14-2007, 12:56 PM   #3
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Default Re: head bolt torquing issue

Did you clean the threads?

How did they sound, did they all creak and pop about the same?

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Old 10-14-2007, 01:05 PM   #4
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Default Re: head bolt torquing issue

Did you chase the threads ,clean them out ,blow out with airhose .
then did you tighten the head down down to 48 pounds,(clean ,dry bolts)
then remove them ,lightly oil,re-install ,re-torque to 22 then 37,then 90 degrees?

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Old 10-14-2007, 07:47 PM   #5
sl2clone
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Default Re: head bolt torquing issue

I never tightened them down to 48 , removed and cleaned them. I got ahead of myself. I'll admit that. I didn't chase the threads or anything. The other high mileage block I had my low mileage head on , everything went very smooth. Bolts went in great , timing lined up nice.
Not this setup though.
I think I tightened the loose feeling bolts a little so they felt more consistent. I did use new bolts again. Wasted a set of bolts on the old block.

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Old 10-14-2007, 11:50 PM   #6
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Default Re: head bolt torquing issue

perhaps I should re phrase the sequence ....
chase the threads in the block ..
blow out all loose material ,with air hose ..
clean the threads on bolts ,if they are used ones ..
install clean and dry ,tighten to 48 ft. pounds...
loosen them back up ,use sequence ,as removing...
lightly oil the bolts , install them, torque to 22 then 37.
then the 90 degrees more1/4 turn.
mine were at about 59 ft pounds ( I looked )

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Old 10-14-2007, 11:59 PM   #7
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Default Re: head bolt torquing issue

about the timing ..
the marks on the head should be the same ,no matter which block .
pins in the holes ,dots up ,links on chain at marks..
key up on crank ,dot on crank sprocket at 12 O;clock ,mark on block.
two links on chain on each side of 6 O;clock, all slack in chain to back.

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Old 10-15-2007, 05:15 PM   #8
sl2clone
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Default Re: head bolt torquing issue

I knida made sure the other bolts were at 60. I would rather be over tourqed than under torqued. I had the drill bits in the holes and they weren't close. The old block I had the head on , everything lined up great. I hope this thing runs!

...
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