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2001 eldorado,2008 DTS,2005 XLR, '96 eldo,'95 eldo,' 89 eldo,'78 eldo,'11CTS-V
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Discussion Starter #1
Ajxtcman says it's ok to reuse headbolts. I'm not convinced. Anybody want to share opinions. And facts.
 

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The Northstar Tuner
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BAD BAD BAD BAD BAD BAD BAD BAD BAD BAD

that is all...
I lost that arguement and was put in my place.
I have never done it, but I have a GM document that says they are reusable.
 

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82 fleetwood - 97 deville
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I lost that arguement and was put in my place.
I have never done it, but I have a GM document that says they are reusable.

ok then...i'd trust GM on this one as much as i do the 3 dollar crack whore down the street...

any bolt that is torqued stretches...the more it is stretched and stressed, the less it will hold next time...
 

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The Northstar Tuner
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ok then...i'd trust GM on this one as much as i do the 3 dollar crack whore down the street...

any bolt that is torqued stretches...the more it is stretched and stressed, the less it will hold next time...
IT IS NOT A STRECH BOLT!!!!!!!!!!!
HOW DID YOU EVER COME UP WITH THAT?
 

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The Northstar Tuner
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As I stated before the main bolts are Torque-Angle also and we do not replace them.
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This is a much superior way to get an even clamping force.
 

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The Northstar Tuner
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This is some information from the 3.6L engine.
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Important: The side main cap bolts originally have a sealant on the flange of the bolt head. NEW bolts must be used. If NEW bolts are not used, oil can leak from the crankcase past the bolts.

The document used to say
Important: The side main cap bolts originally have a sealant on the flange of the bolt head. NEW bolts must be used. If NEW bolts are not used applie thread sealer parts #12346004 or oil can leak from the crankcase past the bolts.
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You order the replacement bolt and the short ones come with no sealer on them!
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They are torque angle also.


PICTURE BELOW
Tighten the short/inner bolts (17-20).
Tighten
Tighten the short/inner bolts to 30 N·m (22 lb ft) plus 60 degrees.

Tighten the long/outer bolts (21-24).
Tighten
Tighten the long/outer bolts to 30 N·m (22 lb ft) plus 60 degrees.

Ensure that the crankshaft turns without binding or noise.
 

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White Diamond '03 DHS (with DTS floor shift)
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I thought they came with new bolts, but that is just what I have been told here.
 

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The Northstar Tuner
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AJ, when you order a new head set from GM, does it come with
the head bolts or do you order those separately?
I am under the impression you can get them both ways. I have only seen them together. We stock them so I have never neede to order them.
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This is from GM service information.

Important: Do not reuse the head bolts after removal. New bolts have a special coating used for bolt retention after installation. This coating remains in the cylinder block threads after removal so proper cleaning of the cylinder block threads is important.


Remove and discard the cylinder head bolts.
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All I am saying is the head bolts can be reused if the sealer is reinstalled.
I have never done it.
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The bolts are not torque to yeild and the only reason to replace the bolts is because the sealer is not on the bolts.
 

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2000 Eldorado ESC
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This is from GM service information.

Important: Do not reuse the head bolts after removal. New bolts have a special coating used for bolt retention after installation. This coating remains in the cylinder block threads after removal so proper cleaning of the cylinder block threads is important.

Remove and discard the cylinder head bolts.
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All I am saying is the head bolts can be reused if the sealer is reinstalled.
I have never done it.
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My opinion is....... if I ever have to pull the heads on my Eldo or ANY Northstar, I will use new headbolts.
And of course time-sert the block no matter how the threads in the block look.
 

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The Northstar Tuner
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My opinion is....... if I ever have to pull the heads on my Eldo or ANY Northstar, I will use new headbolts.
And of course time-sert the block no matter how the threads in the block look.
I have always replaced them.
I would never put a piece of crap TimeSert in a 99 and prior block.
You do realize the all it does is make the bolt a 12mm instead of 11mm.
 

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i just had my h/g done not to long ago and the GUY said to replace all the head bolts... and have all the holes done not just the ones that pulled but all the holes..
 

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i just had my h/g done not to long ago and the GUY said to replace all the head bolts... and have all the holes done not just the ones that pulled but all the holes..
And when they fail than what.
I would say that the 99 and prior engines with TimeSerts will fail at the same rate if not more.
Look at the pictures on the second page of the link.

TimeSerts are not a magic fix to a bad block!
If the threads have become pitted or the material of the block has broken down a timesert will not hold!
If you drill out the block and the material is not bright and shiny that would indicate that the material has become oxidized. The material will be powdery like dust. How can a TimeSert hold in powder?
 

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2006 STS V8 AWD, '95 Ford Ranger
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And when they fail than what.
I would say that the 99 and prior engines with TimeSerts will fail at the same rate if not more.
Look at the pictures on the second page of the link.

TimeSerts are not a magic fix to a bad block!
If the threads have become pitted or the material of the block has broken down a timesert will not hold!
If you drill out the block and the material is not bright and shiny that would indicate that the material has become oxidized. The material will be powdery like dust. How can a TimeSert hold in powder?
If the block metal isn't sound use a Bigsert. One of the problems associated with the Northstar's casting process is controlling the metal cooling rate. The powdered base metal isn't the result of corrosion, it's improper cooling.
 
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