25-09-2024, 10:50 AM
With reference to cylinder head leaking, I have an experience that may be relevant.
After the recent overhaul of my Ruby engine and following some miles of running and 3 episodes of retightening of the cylinder head nuts, water and gas was bubbling out around the centre studs. These were new studs screwed into the block with sealant and new nuts. Replacing the gasket didn't fix the leakage.
A VAR member with long experience of Austin Sevens advised me that the new nuts could be the cause. He has had similar leakage and resolved it by using taller nuts of the size that are used on the block to crankcase studs. His theory is that the taller nuts have more threads in contact with the stud threads and therefore are less stressed.
I have fitted the taller nuts and covered 200 miles now without leakage.
After the recent overhaul of my Ruby engine and following some miles of running and 3 episodes of retightening of the cylinder head nuts, water and gas was bubbling out around the centre studs. These were new studs screwed into the block with sealant and new nuts. Replacing the gasket didn't fix the leakage.
A VAR member with long experience of Austin Sevens advised me that the new nuts could be the cause. He has had similar leakage and resolved it by using taller nuts of the size that are used on the block to crankcase studs. His theory is that the taller nuts have more threads in contact with the stud threads and therefore are less stressed.
I have fitted the taller nuts and covered 200 miles now without leakage.