CJ3A 1950 Flat Head valve adjusting help.. - JeepForum.com
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Unread 09-02-2014, 11:24 AM   #1
Longhunter1
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1950 CJ3A 
 
Join Date: Aug 2014
Location: Bolivar, Pa
Posts: 36
CJ3A 1950 Flat Head valve adjusting help..

Have my valves all ground and re-installed, now ready to adjust.
Cant seem to find the clearance they should be stated anywhere????
Can somebody help with that??
And also the best method of assuring the lifter is fully retracted?
Does anyone know if the "('s" method works on a four cylinder?? Saw it described on a couple web sites but all the examples were for 6 cylinders.
Or can you direct me to a chart on line telling me which valve to adjust when a corresponding valve is fully open????
Thanks to all,

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Unread 09-02-2014, 12:29 PM   #2
Mike Romain
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1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,108
My book says to start at #1 cylinder and to turn the engine with a wrench until you see the valve close, then turn the engine 90 more to have the valve on the heel of the cam lobe. .016 for intake and .018 for exhaust.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 09-04-2014, 12:54 PM   #3
Longhunter1
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1950 CJ3A 
 
Join Date: Aug 2014
Location: Bolivar, Pa
Posts: 36
There are some guys on YOUTUBE that basically turn the engine slowly until one of the cylinders valves just starts to lift and then they adjust the other??
They really do not explain but it seems that when one is just starting to open the other must be fully closed???
Another fella mentioned a thing he calls the rule of 9 ??
He sutracts the number of the totally open valve at it's highest point, from the number 9. He says that then gives him the number of the valve that is fully closed and thats the one he then adjusts??
But his examples are for six sylender engines.
I have not yet started to adjust the valves but that is my next thing I'm doing.
I will try his NINE method and see how that works with a 4 cylinder.
But the easiest way seems the first method I described??
Take care
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Unread 09-05-2014, 07:18 AM   #4
Mike Romain
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1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,108
I like the way my CJ repair manual says and I would do it that way myself, seems pretty easy. But, the opposite valves on the distributor cap can be used I guess. So when the valves on #4 are closing and opening, #1 should be fully closed. Same for 2 and 3.

If this was perfectly accurate, I would think the book would mention it, but hey, it is just the Haynes manual.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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