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Thowdfella · Dec 25th, 2019, 09:06

My car is a 1966 122s and I have been concerned because compression on all cylinders has been measured at 125 psi on a hot engine. So, I took the head off, couldn't see much wrong but had hardened valve seats, new valve guides and new exhaust valves fitted and vacuum test showed it was very good.
Checked the compression again - this time on a cold engine. - and this time they were all 100psi.
I can only presume the problem is now with the piston rings as the bores looked smooth with no lip at the top of the bores.
Is it possible to take out the pistons with the engine in situ or does it have to come out? I remember doing an Austin 10 from underneath!
Any thoughts would be appreciated!

Dec 25th, 2019, 09:06	#1
Thowdfella Thowdfella Last Online: Jul 23rd, 2022 09:04 Join Date: Feb 2019 Location: Chorley	Piston rings My car is a 1966 122s and I have been concerned because compression on all cylinders has been measured at 125 psi on a hot engine. So, I took the head off, couldn't see much wrong but had hardened valve seats, new valve guides and new exhaust valves fitted and vacuum test showed it was very good. Checked the compression again - this time on a cold engine. - and this time they were all 100psi. I can only presume the problem is now with the piston rings as the bores looked smooth with no lip at the top of the bores. Is it possible to take out the pistons with the engine in situ or does it have to come out? I remember doing an Austin 10 from underneath! Any thoughts would be appreciated!