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I learned a very important and painful lesson today - never reuse

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Thread replies: 16
Thread images: 4

File: headbolt_sr20.jpg (166KB, 800x600px) Image search: [Google]
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I learned a very important and painful lesson today - never reuse head bolts. I changed the head gasket on a 1996 Jeep Grand Cherokee 4.0 and reused the head bolt because it had a blown piston and I had to take the head off to replace it. Since it didn't overheat I figured reusing the head bolt would work fine.

Now there's coolant in the oil and I just wasted $20 worth of oil, along with a $30 head gasket, plus an entire day of pain and suffering once more to change it out in 110°F weather. :(
>>
>>15566982
Hah! Or you just didn't torque them down in the correct order.
>>
>>15566982
are you sure they didn't just get mixed in the disassembly process? I would expect a little to flow around when you removed the head.
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>>15566997
>>15567013
Nope, I checked it multiple times and even did the head gasket change while the engine was pulled out so that it'd be easier to do. Compression was also checked before I ran the engine and it was good as well so I still can't figure out exactly what caused the head gasket to fail when I ran it. My theory so far is that somehow the bolts failed to hold the torque properly as the engine heated up.
>>
>>15567031
Sucks man, sorry to hear. I've reused head bolts before without issues, but now that I actually have money, it's worth the extra 50 bucks to get new ones.

That said, I don't believe the Chrysler 4.0 uses torque to yield head bolts so you shoulda been good. Did you check the head and block for flatness? Were the surfaces absolutely clean? When was the last time you had your torque wrench calibrated? Are you 100% you did the bolts in the right order?

I ask because these are all things to fuck you over again, even if you get new bolts. Don't want to do it a third time.
>>
Were they TTY or not?
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>>15566982
Fucking dumbass.

>hurr durr I wanna save a few bucks instead of doing it properly
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>>15567031
>I can't figure out why my head gasket failed
>didn't send the head in to be resurfaced
>blames head bolts.
Huh imagine that.
>>
>>15567135
on that engine NO
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>>15567276
The engine didn't overheat, see >>15567031. It was a blown piston.
>>
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>>15568274
>"Compression was also checked before I ran the engine and it was good"
>blown piston
he didnt mention a blown piston in any of his posts.
the piston probably cracked because the headgasket blew causing low compression after the fact
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>>15568320
Read the first fucking post dipshit. Second sentence.
>>
>>15568320
>he didnt mention a blown piston in any of his posts.
Are you legitimately retarded?
>>
>>15566982
>>15567031
Yeah, you don't reuse torque to yield head bolts...
>>
>Piston got smashed due to detonation
>Wonders why new head gasket is gone

I think its time to fix the real problem.
>>
>>15566982
My Landcruiser shop manual has a spec for the headbolts. If they get stretched so that any part is thinner than the minimum, replace. Otherwise OK.
Thread posts: 16
Thread images: 4


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