Car: 2010 Passat CC 1.8 TSI

There is no problem with the old gasket there is no leak i just remove the head because timing problem.

Cylinder head, i've cleaned the head with plastic tools and some cleaning materials looks fine i've checked and tested everything looks good.

Cylinder Head

Engine Block, i've cleaned the Block using razor blades and plastic tools now there is no gasket material and and the Block surface very smooth but not shiny (please see pics) there is nothing more can do using plastic tools!

How and what is the best way to clean the block for MLS Gasket?

Block surface

Block surface

  • 1
    The best test I've found to tell if the surface is clean enough is to lightly run your fingernail over the surface where you think there may be stuff left. If you feel any drag at all, you still have work to do. Jul 21, 2017 at 20:48
  • @Pᴀᴜʟsᴛᴇʀ2 i've tried fingernail over the surface feel so smooth but the block not shiny you can see the pics Jul 21, 2017 at 20:55
  • You can buy die grinder disks that have little plastic nubs on them, meant for cleaning aluminum without damaging the surface. Another option is to have it machined by a specialist,
    – Ben
    Jul 21, 2017 at 21:23
  • @Ben machined is not an option, and i think grinder discs bad for mls gaskets. Jul 21, 2017 at 21:29
  • This is the style of disc I'm talking about amazon.com/Scotch-Brite-07528-Quick-Change-Attachment-Aluminum/…
    – Ben
    Jul 21, 2017 at 21:32

1 Answer 1


As long as there are no nicks or burs on the block you are good to reassemble, clean with brake cleaner and red scotch bright.

Aluminum head should be as smooth as possible to allow sliding on the gasket as it will expand faster and farther than cast iron. Clean same as block.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .