28-09-2018, 10:30 AM
I'm particularly interested in this thread since, after rebuilding my Nippy engine and fitting a new 9E1 cylinder head (Tony Betts) with a 9E1 gasket (Ian Williams via Martin Baker) I'm experiencing head bolt leak on a newly assembled engine for the first time in the 50 years I have owned the Nippy. There is also a slight leak at the front-left corner of the gasket.
The remarks about the changed gasket materials are interesting. The core of the 9E1 gasket seems considerably harder and thicker than the previous asbestos ones. The copper surfaces are also thicker, and stiffer, than the last standard HC gasket that was fitted - roughly 0.3mm compared to 0.1mm.
So I was wondering whether it would be advisable to apply more torque than 20 ft/lbs to the cylinder head nuts so as to compress the gasket more. What do you guys think about that? I don't want to break the studs!
The gasket was sealed with grease which, as Ian also mentioned, served well previously. However I have now ordered some Loctite 5990 from Simply Bearings - just in case.
The remarks about the changed gasket materials are interesting. The core of the 9E1 gasket seems considerably harder and thicker than the previous asbestos ones. The copper surfaces are also thicker, and stiffer, than the last standard HC gasket that was fitted - roughly 0.3mm compared to 0.1mm.
So I was wondering whether it would be advisable to apply more torque than 20 ft/lbs to the cylinder head nuts so as to compress the gasket more. What do you guys think about that? I don't want to break the studs!
The gasket was sealed with grease which, as Ian also mentioned, served well previously. However I have now ordered some Loctite 5990 from Simply Bearings - just in case.