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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 04-12-2011, 08:34 AM   #1 (permalink)
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Head Gasket Thickness

At what point in head thickness do you have to use the .3 mm thicker gasket?

Bentley manual implies 125 mm is the thinnest which I am very very close to.

Opinions, facts, experiences, sob stories, anyone?
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Old 04-14-2011, 03:28 AM   #2 (permalink)
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Should have read the manual more closely!

Yes!

The Bentley manual says (sic) "If the head has been machined fit the thicker gasket" No equivocation there.

Bugger!

I should have ordered it with my other bits from Pelican Parts
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Old 04-14-2011, 10:16 AM   #3 (permalink)
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Thanks for following up!
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Old 04-15-2011, 10:25 AM   #4 (permalink)
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A new head will be 125.1 mm +-0.1 So that would mean the minimum height for a standard gasket to be fitted would be 125.0 mm?? However maybe there are other considerations re compression etc.

My head seems slightly off as it is 125 on one end and 124.98 on the other.I hope .02 of a mm won't hurt.

If the head is less than 124.7 you throw it away.

So the best case is you can remove .5 mm and the worst case you can remove .3mm from a new head before it is stuffed.

My head has had 2 resurfacing jobs done so I hope it lasts for a long time.
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Old 04-27-2011, 10:17 AM   #5 (permalink)
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Starting to go back together now
Been VERY careful with timing marks, but it doesn't seem too complicated.
Has anyone made a gauge for torquing up the head bolts?
I'm thinking of making something up with a protractor but there isn't a lot of room between all the the rockers and head bolts so if someone has a better idea??
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Old 04-27-2011, 10:27 AM   #6 (permalink)
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You are using new head bolts right?
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Old 04-28-2011, 12:41 AM   #7 (permalink)
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Ohhh yes! Using new everything almost.
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