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CA Valve Spring Specs |
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dfwallis
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Joined: 09 Mar 2023 Location: Texas / Indiana Points: 1062 |
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Topic: CA Valve Spring SpecsPosted: 21 Oct 2026 at 1:11pm |
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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 |
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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
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Joined: 09 Mar 2023 Location: Texas / Indiana Points: 1062 |
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Posted: 21 Oct 2026 at 8:26pm |
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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
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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
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Joined: 09 Mar 2023 Location: Texas / Indiana Points: 1062 |
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Posted: 21 hours 22 minutes ago at 4:11pm |
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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 - 21 hours 20 minutes ago at 4:13pm |
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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
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Joined: 09 Mar 2023 Location: Texas / Indiana Points: 1062 |
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Posted: 21 hours 9 minutes ago at 4:24pm |
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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 8 minutes ago at 4:25pm |
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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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steve(ill)
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Joined: 11 Sep 2009 Location: illinois Points: 93420 |
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Posted: 20 hours 57 minutes ago at 4:36pm |
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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) - 20 hours 50 minutes ago at 4:43pm |
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Like them all, but love the "B"s.
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steve(ill)
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Joined: 11 Sep 2009 Location: illinois Points: 93420 |
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Posted: 20 hours 53 minutes ago at 4:40pm |
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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..
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Like them all, but love the "B"s.
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dfwallis
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Joined: 09 Mar 2023 Location: Texas / Indiana Points: 1062 |
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Posted: 20 hours 11 minutes ago at 5:22pm |
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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 7 minutes ago at 5:26pm |
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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
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Posted: 4 hours 12 minutes ago at 9:21am |
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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.
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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
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Joined: 09 Mar 2023 Location: Texas / Indiana Points: 1062 |
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Posted: 4 hours 10 minutes ago at 9:23am |
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I was afraid id burnt a valve, but doesn't seem so.
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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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DrAllis
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Joined: 12 Sep 2009 Points: 23649 |
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Posted: 4 hours 9 minutes ago at 9:24am |
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A quick cranking compression test would verify that or not.
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dfwallis
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Joined: 09 Mar 2023 Location: Texas / Indiana Points: 1062 |
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Posted: 3 hours 17 minutes ago at 10:16am |
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128psi
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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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DrAllis
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Posted: 2 hours 55 minutes ago at 10:38am |
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As compared to the other three?? looks fine to me, but how are all of them ??
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Les Kerf
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Joined: 08 May 2020 Location: Idaho Points: 1925 |
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Posted: 2 hours 44 minutes ago at 10:49am |
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Glad you found it
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dfwallis
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Joined: 09 Mar 2023 Location: Texas / Indiana Points: 1062 |
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Posted: 1 hour 24 minutes ago at 12:09pm |
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Theyre all near 130
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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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DrAllis
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Joined: 12 Sep 2009 Points: 23649 |
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Posted: 1 hour 4 minutes ago at 12:29pm |
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Good to go !!!
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