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CA Valve Adjustment
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1955CA View Drop Down
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Joined: 10 Sep 2018
Location: Ontario, Canada
Points: 585 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1955CA Quote  Post ReplyReply Direct Link To This Post Topic: CA Valve Adjustment
    Posted: 03 Jun 2024 at 2:24pm
So I mentioned this in my water pump thread. My CA suddenly developed a pop when running that you could hear through the intake. I suspected a valve issue, but hoped for the best as engine was supposedly rebuilt when I bought it and I rarely ever ran it due to the rear wheels being rotten (which I just replaced last summer.)

So I just pulled valve cover and was relieved to see the push rod for #4 cylinder was not under the rocker arm. I pulled it out, no marks looks good.
So I thought it just came out of adjustment. But then noticed all the nuts on the four (sorry, for lack of a better term) of the "bridges or stands" that holder the rocker shaft were all loose. The nuts on the same studs that hold the valve covers on.

Are they known to come loose? Or did the last owner just not tighten properly?

And now, how much do I tighten those nuts and should I use Locktite?

I haven't looked at my manuals I have for it yet, but hopefully it has the specs for setting the clearances. Any tips would be appreciated. Thanks.
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1955CA View Drop Down
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Joined: 10 Sep 2018
Location: Ontario, Canada
Points: 585 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1955CA Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 2:26pm
Everything looks nice and clean. I put lifter back in place and started it briefly and even without setting it up properly it runs almost perfect now!
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1955CA View Drop Down
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Joined: 10 Sep 2018
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Points: 585 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1955CA Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 2:27pm
Sorry, still can't figure out how to post multiple pics.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 81063 		Post Options Post Options   Thanks (1) Thanks(1)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2024 at 4:21pm
I set the valves at .014 COLD.... that makes the clearance about .012 when the engine heats up... I have never heard of the rocker arm nuts loosening up.. I would guess they were never tightened properly.
Like them all, but love the "B"s.
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8235 		Post Options Post Options   Thanks (1) Thanks(1)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2024 at 12:16pm
They don't come loose. 3/8 fine thread? Probably around 30lb/ft.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 81063 		Post Options Post Options   Thanks (1) Thanks(1)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2024 at 12:55pm
Shawn... one thing i have found interesting over the years... is that many rocker arms dont set dead center over the valve stem.. They seem to be off 1/8 inch or more.. been that way forever.... if you look at your second photo you can see a couple that are obvious.
Like them all, but love the "B"s.
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Joined: 09 Mar 2023
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Points: 627 		Post Options Post Options   Thanks (1) Thanks(1)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2024 at 3:52pm
Originally posted by steve(ill) steve(ill) wrote:

Shawn... one thing i have found interesting over the years... is that many rocker arms dont set dead center over the valve stem.. They seem to be off 1/8 inch or more.. been that way forever.... if you look at your second photo you can see a couple that are obvious.

I fixed all of mine, for good or bad.  All nice and centered now.  No more barely inside the outer edge deep indention wear patterns, I hope.
1952 CA13092
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1955CA View Drop Down
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Points: 585 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1955CA Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2024 at 5:49pm
How did you fix them to line up?
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1955CA View Drop Down
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Thanks for all the info everyone. I won't have time until next week to touch it again, but I ordered another timing light so I'll hopefully get her all tuned up.
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Joined: 09 Mar 2023
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Originally posted by 1955CA 1955CA wrote:

How did you fix them to line up?

Nearly all that was required was minor machining of the standoffs on one side (there might have been an exception, I can't recall).  Must be sure to get them nice and flat/true.  I only removed just enough to center them but no more.
1952 CA13092
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1955CA View Drop Down
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Joined: 10 Sep 2018
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Points: 585 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1955CA Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2024 at 6:19pm
Originally posted by dfwallis dfwallis wrote:

Originally posted by 1955CA 1955CA wrote:

How did you fix them to line up?

Nearly all that was required was minor machining of the standoffs on one side (there might have been an exception, I can't recall).  Must be sure to get them nice and flat/true.  I only removed just enough to center them but no more.

Oh okay, thanks. Did you have to shim them at all?
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Joined: 09 Mar 2023
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Points: 627 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2024 at 7:11pm
Originally posted by 1955CA 1955CA wrote:

Originally posted by dfwallis dfwallis wrote:

Originally posted by 1955CA 1955CA wrote:

How did you fix them to line up?

Nearly all that was required was minor machining of the standoffs on one side (there might have been an exception, I can't recall).  Must be sure to get them nice and flat/true.  I only removed just enough to center them but no more.

Oh okay, thanks. Did you have to shim them at all?

I don't believe that I had to add or subtract any components that were already there (e.g. washers).  They pretty much self center via spring pressure.  But be sure to think it fully through before you make any modifications.  Only do one at a time and see what the overall impact is by reassembling where needed.  I only took off thousandths at a time, trued it up, polished it and reassembled to see the result before taking any more off.  But it is possible to add shims (washers/machine bushings). 
1952 CA13092
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steve(ill) View Drop Down
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Points: 81063 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2024 at 8:07pm
my point was it looks "ODD".... but has been that way for 70 years.. IT will probably run another 70... Wink
Like them all, but love the "B"s.
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Joined: 09 Mar 2023
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Points: 627 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jun 2024 at 8:12pm
Originally posted by steve(ill) steve(ill) wrote:

my point was it looks "ODD".... but has been that way for 70 years.. IT will probably run another 70... Wink

True, but some of mine were so far off there was only about 1/8 inch of contact area.
1952 CA13092
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