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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Dec-15-2017, 02:30:41 PM   #1
grannyknot
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Default S54 Head bolt, dry or oiled?

In m3 hal's excellent sticky, http://www.m3forum.net/m3forum/showthread.php?t=546907 it states "Replace head bolts, wash, and oil screws."
Same here, http://www.adrianteo.com/files/cylin...ad%20_S54_.pdf
It says,
"Use cylinder head bolts only once.
There must be no oil in the tapped holes of the engine block
and the timing case cover.
Risk of cracking and distorted tightening values.
Put the cylinder head on.
Apply a light coat of oil to washer contact area and thread of new
cylinder head bolts."

But when I removed the head bolts from my engine most of the bolts where clean and dry, no oil and I'm sure it was the first time that head had been off since the factory.
Opinions?
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Old Fri, Dec-15-2017, 02:34:47 PM   #2
bigjae1976
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Default Re: S54 Head bolt, dry or oiled?

I wouldn’t worry about whether the bolts came out dry. If it’s the bolts installed at the factory, the block is fresh so the procedure could call for no oil...just a theory.

I would install per the procedure.


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Old Fri, Dec-15-2017, 02:35:19 PM   #3
kokgo20
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Default Re: S54 Head bolt, dry or oiled?

Light coat of oil is good, they meant not full of oil.
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Old Fri, Dec-15-2017, 03:42:22 PM   #4
qualicas
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Default Re: S54 Head bolt, dry or oiled?

VERY IMPORTANT: Make sure the head bolt holes are cleaned of any oil or debris before installing head bolts. If there is any oil at bottom of bolt hole and you screw in the bolt, the hydraulic pressure will crack the block. I blow the holes clean with air using a narrow air nozzle that gets to the bottom of the hole. Then I also hand thread all bolts all the way in beyond where they stop with head installed. That way I am sure there is nothing at the bottom of the hole plus the reads are smooth and not damaged. Then I know when the head goes on, all bolts will get proper torque.
Takes 5 minutes but you are sure there is no issue.
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Discussing S54 Head bolt, dry or oiled? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)