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#347442 14/03/16 01:09 AM
Joined: Apr 2015
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Marcus Offline OP
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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
Marcus #347444 14/03/16 01:42 AM
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On mine there is no locking nut. They are just tough to move!


Richard
1976 4/4 4 Seater
Marcus #347467 14/03/16 07:30 AM
Joined: May 2014
Posts: 2,774
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Originally Posted By Marcus
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
Marcus #347481 14/03/16 08:50 AM
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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
Marcus #347485 14/03/16 09:09 AM
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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
DaveW #347500 14/03/16 09:41 AM
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Scruffy Oik
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Originally Posted By DaveW
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
Marcus #347504 14/03/16 09:53 AM
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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
DaveW #347507 14/03/16 09:59 AM
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Scruffy Oik
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Originally Posted By DaveW
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
Marcus #347508 14/03/16 10:04 AM
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Works well, never had one work loose.


.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
Marcus #347513 14/03/16 10:18 AM
Joined: Apr 2015
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Marcus Offline OP
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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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