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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Apr 2015
Posts: 62
Just Getting Started
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OP
Just Getting Started
Joined: Apr 2015
Posts: 62 |
I am really feeling dumb. I am doing some touching up of the engine compartment and decided to replace the valve cover gasket and adjust the valves on my '70 4/4 Kent 1600 crossflow head. I cannot find the locking nut on the rocker arm adjusting screw. There is just a hollow threaded screw that goes onto the pushrod. What am I missing? I've adjusted valves on a lot of cars and there has always been some nut to secure the threaded adjuster in place. Is this threaded screw an interference type that requires a lot of force to move and then stays put. Seems unlikely but something must hold the screw in place. Any help would be appreciated.
Mark
1970 4/4 Morgan
Two '53 MG TD's
1949 MG TC
1988 Porsche Boxster
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Joined: Jan 2012
Posts: 14,976 Likes: 2
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jan 2012
Posts: 14,976 Likes: 2 |
On mine there is no locking nut. They are just tough to move!
Richard
1976 4/4 4 Seater
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Joined: May 2014
Posts: 2,780 Likes: 5
Talk Morgan Expert
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Talk Morgan Expert
Joined: May 2014
Posts: 2,780 Likes: 5 |
I am really feeling dumb. I am doing some touching up of the engine compartment and decided to replace the valve cover gasket and adjust the valves on my '70 4/4 Kent 1600 crossflow head. I cannot find the locking nut on the rocker arm adjusting screw. There is just a hollow threaded screw that goes onto the pushrod. What am I missing? I've adjusted valves on a lot of cars and there has always been some nut to secure the threaded adjuster in place. Is this threaded screw an interference type that requires a lot of force to move and then stays put. Seems unlikely but something must hold the screw in place. Any help would be appreciated. Yes, they are 'self locking' .. They stay put by magic. Just make sure you have a good fitting spanner and watch knuckles!
Steve
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Joined: Aug 2013
Posts: 3,383 Likes: 14
Talk Morgan Addict
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Talk Morgan Addict
Joined: Aug 2013
Posts: 3,383 Likes: 14 |
Others above are totally correct, if you have a 'deep crank' ring spanner it will aid your work tremendously. As always 'Rule of 9' works but Ford at one time issued a TIB (Technical Information Bulletin) to say they should be adjusted TDC Firing on each cylinder in turn, to be honest and having used both methods there is no difference whatsoever whichever method you use and I have tried with the engine on a bench with a clock gauge on the crank and a DTI on the valves, as long as your on the back of the cam your fine.
BR Colin
Who used to be a Spanner Juggler
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Joined: Dec 2008
Posts: 22,371 Likes: 354
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,371 Likes: 354 |
I'd forgotten about the Ford self locking valve adjustment!
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Apr 2008
Posts: 12,265 Likes: 321
Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
Joined: Apr 2008
Posts: 12,265 Likes: 321 |
I'd forgotten about the Ford self locking valve adjustment! I've never understood how this is achieved, presumably it's something elegant, or is it just a case of having mismatched thread forms?
Last edited by Hamwich; 14/03/16 09:42 AM.
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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Joined: Dec 2008
Posts: 22,371 Likes: 354
Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,371 Likes: 354 |
It's a mystery to me. You'd think the heat cycle would quickly loosen them off.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Apr 2008
Posts: 12,265 Likes: 321
Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
Joined: Apr 2008
Posts: 12,265 Likes: 321 |
It's a mystery to me. You'd think the heat cycle would quickly loosen them off. Indeed.
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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Joined: Apr 2014
Posts: 5,182 Likes: 2
Charter Member
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Charter Member
Joined: Apr 2014
Posts: 5,182 Likes: 2 |
Works well, never had one work loose.
.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
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Joined: Apr 2015
Posts: 62
Just Getting Started
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OP
Just Getting Started
Joined: Apr 2015
Posts: 62 |
Thanks for the input. I guess I was right but it seems a bit bizarre to say the least. I'll give it a go. Apparently it has been like that for 45 years so it must work. It is an odd or clever design. I like the belt and suspenders approach with the lock nut but I guess I have no choice.
Mark
Mark
1970 4/4 Morgan
Two '53 MG TD's
1949 MG TC
1988 Porsche Boxster
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