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CA Valve Spring Specs

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dfwallis View Drop Down
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Joined: 09 Mar 2023
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    Posted: 21 Oct 2026 at 1:11pm
Ive finally gotten around to diagnosing the misfire issue. Im measuring valve spring tension and none seem to be as expected. The stongest one is 55psi and one was only 35psi. The head rebuild was supposed to take care of that. Ill measure again after i research my technique...i bought an on head tool. It seems easy enough to use. I & T says 55-65psi to 1 5/16". One source says 70 psi but none approach that.

Edited by dfwallis - 21 Oct 2026 at 1:59pm
1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower
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dfwallis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 21 Oct 2026 at 8:26pm
Appears that the tool cant accommodate the wide rocker pushrod to valve spacing. Ive enquired to the manufacturer if additional spacer inserts are available. Unfortunately, i think that will make the readings worse not better...lever arm pivet point is presently behind the valve which means it requires more force to compress the spring
1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower
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dfwallis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 22 hours 5 minutes ago at 4:11pm
The tool vendor indicates that ill have to calibrate the tool by installing a spring of known value then adjusting the pivot length and then measure the other springs. Not how i assumed it would work, but makes sense...they're sending additional spacers...the tool design assumes modern racing engines and didn't anticipate such long rocker arms. To start, ill assume the strongest spring is in spec and see what the variation is.

Edited by dfwallis - 22 hours 3 minutes ago at 4:13pm
1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 52 minutes ago at 4:24pm
I believe ive found a significant issue with cylinder 3 exhaust rocker. When you remove slack and aren't careful about applying a light side force, it twists slightly. Then if you measure it, its in spec. However if you are careful to remove slack by applying perfectly in line force, it only has .003 clearance. Not good. Ive reset the clearance for the inline movement and will see how it runs. Unfortunately, i left the key on and ran the battery down and its taking forever to charge. Several rockers are similarly worn. I had assumed the rebuild checked all that but apparently not. Im probably going to buy a complete new set if this helps. With so much wear, when the push tube contacts it, the rocker again twists.

Edited by dfwallis - 21 hours 51 minutes ago at 4:25pm
1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 40 minutes ago at 4:36pm
here is a photo of the rocker arm shaft with the rockers installed... are you saying the rocker arm BORE is worn and it wobbles on the shaft ?   I have never had that problem....(maybe they wobble a few thousandths and i have never considered that a problem ???)....  I have never checked the spring tension either.. only problem i have noticed is the rocker arm pad that sets on the valve is not always centered on the valve.. Have seen serveral that are way of center... but dont seem to hurt anything..




Edited by steve(ill) - 21 hours 33 minutes ago at 4:43pm
Like them all, but love the "B"s.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 36 minutes ago at 4:40pm
here is a picture of one HEAD that had a bad freeze plug.... look at the two valves and their rockers and you can see they are OFF CENTER.... That seems to be very common on these old engines..


Like them all, but love the "B"s.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 20 hours 54 minutes ago at 5:22pm
Both the rocker and the shaft have deep wear grooves...when it twists, the contact point can slide and cant 1/8 inch. Only one has this weird behavior...

Edited by dfwallis - 20 hours 50 minutes ago at 5:26pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 55 minutes ago at 9:21am
That odd rocker arm behavior was the problem. Ive not seen it run this smooth since the 70s. It will need a tuneup again though.
1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 53 minutes ago at 9:23am
I was afraid id burnt a valve, but doesn't seem so.
1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 52 minutes ago at 9:24am
A quick cranking compression test would verify that or not.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 60 minutes ago at 10:16am
128psi
1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 38 minutes ago at 10:38am
As compared to the other three?? looks fine to me, but how are all of them ??
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 27 minutes ago at 10:49am
Glad you found it Smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 7 minutes ago at 12:09pm
Theyre all near 130
1952 CA13092, CA Pickup Plow, CA Cultivator, CA Two Row Planter, Dunham-Lehr GC78 Disc, Grader Blade, 3pt Fm180 Finish Mower
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 47 minutes ago at 12:29pm
Good to go !!!
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