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D12 rocker adjust studs too short
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jjrosty View Drop Down
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Joined: 15 Sep 2009
Location: Broken Arrow OK
Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jjrosty Quote  Post ReplyReply Direct Link To This Post Topic: D12 rocker adjust studs too short
    Posted: 6 hours 29 minutes ago at 10:41am
I acquired a D12 last year as a pile of parts.  The rocker arm adjusting screws did not have lock nuts & the adjustment screws are too short for locknuts, they are bottomed out in the rocker arm.   The push rods are the correct length 9.25”
The possible causes are endless. 
What would be the best way to resolve this situation. 
I think B push rods are 9.8” long could I replace them?
Any useful opinion for a fix would greatly be appreciated .
If you always do, what you always did,
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22819 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 42 minutes ago at 12:28pm
The adjustment screws should be long enough for a jam nut. So, get some that are long enough and the problem is solved.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 90822 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 35 minutes ago at 12:35pm
are you saying the adjusting screws MIGHT be the right length, but they are screwed in 1/2 inch too far ?  If that is the case, there should be a LOT OF THE SCREW sticking out of the rocker arm  ??.. If you adjust the screw out so it looks  "like a good location".. can you get the nut on and the pushrods are just  1/4 - 1/2 inch too short ??   Do the valve springs look like the valves are long enough sticking out of the top of the head ?  Valves not compressed too much ?

not an exact science, but the ROCKER should set about perpendicual to the valve stem and the pushrod... just a visual check for "normal" rocker position.


Edited by steve(ill) - 4 hours 24 minutes ago at 12:46pm
Like them all, but love the "B"s.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 90822 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 14 minutes ago at 12:56pm
here is a drawing from the "B" service manual.. Shows the rocker arm setting about horizontal.... You should visually be able to tell of your rocker is too far toward the pushrod or too far toward the valve... That would tell you which side the problem is on... assuming your adjusting screws are proper length to have the ball sticking out on the bottom and the nut installed on the top...




Edited by steve(ill) - 4 hours 8 minutes ago at 1:02pm
Like them all, but love the "B"s.
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jjrosty View Drop Down
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Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jjrosty Quote  Post ReplyReply Direct Link To This Post Posted: 37 minutes ago at 4:33pm
I’ve thought of that.   Where would someone source longer rocker arm screws?
If you always do, what you always did,
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