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Austinsevenfriends
Replacing cylinderhead - Printable Version

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RE: Replacing cylinderhead - Charles Levien - 03-12-2019

(03-12-2019, 07:44 PM)Paul Nott Wrote: Just getting ready to fit my new alloy head and was wondering if the headgasket should be coated with grease or gasket sealer prior to fitting.
What do you use on a modern copper gasket?

There seems to be a wide variety of opinions and experiences on this, from just grease it to using blue hylomar. 
I use the latter — spraying a thin film on all four surfaces which works well for me. Important though to torque down the head nuts with the central three leading the way.

RE: Replacing cylinderhead - Alan - 03-12-2019

Depends. If your surfaces are perfect, a thin coat of grease will do. Otherwise loctite 5920 applied sparingly works for me.

RE: Replacing cylinderhead - AustinWood - 03-12-2019

I use a smear of grease. It is there to lubricate the gasket and allow it to take up its position as it is tightened down.

RE: Replacing cylinderhead - rubyman - 03-12-2019

When I bought my Ruby with a seized engine because the bores had been left with water in them, after removing the pistons the bores looked like yours I honed the bores till they were nice and shiny fitted new pistons and now I have compression's of 110 on all cylinders, I also use loctite when fitting a head gasket & having overhauled more engines than I can remember never had a failure yet  Rolleyes

RE: Replacing cylinderhead - Steve Jones - 03-12-2019

(03-12-2019, 08:56 PM)Alan Wrote: Depends. If your surfaces are perfect, a thin coat of grease will do. Otherwise loctite 5920 applied sparingly works for me.

+1. 

Steve

RE: Replacing cylinderhead - Charles Levien - 04-12-2019

(03-12-2019, 08:56 PM)Alan Wrote: Depends. If your surfaces are perfect, a thin coat of grease will do. Otherwise loctite 5920 applied sparingly works for me.

This forum is particularly good at getting a consensus of opinion — I’ll certainly try the loctite next time

RE: Replacing cylinderhead - Paul Nott - 04-12-2019

Nice to know that whatever I do someone will agree with me !

RE: Replacing cylinderhead - Paul Nott - 05-12-2019

    Finding it difficult to obtain Hylomar spray or Loctite 5920 locally, has anyone use Loctite si5990?

RE: Replacing cylinderhead - Steve Jones - 05-12-2019

Loctite 5990 and 5920 are exactly the same thing. 5990 is just a later reference number.

Steve

RE: Replacing cylinderhead - Chris KC - 05-12-2019

Personally I find a smear of grease sufficient.

But yes when suggesting 'Loctite' do please specify which specific product!