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Any shadetree mechanics that can help? (Read 686 times)

Jun 14^th, 2003 at 11:09am

Glitch Offline
Colonel
aka IRAF_Paddy
Birmingham, Alabama

Gender:
Posts: 464

I need some advice. I have a worn rocker arm stud on the #5 intake valve of my 69 chevy 250 6 cylinder. The result is that the rocker arm sits about 5degrees to the right of the top of the valve. If I pull the head and take it to the machine shop to have it rebuilt I blow the cash that I have been saving for that new g4 ti4600 I have been wanting. Questions: Any one know of a way short of a machine shop to extract the rocker arm stud? Perhaps stacking washers almost to the top of the threads and tighting the bolt down? Or perhaps take a different tack place a coupla washers under the rocker arm to clear the worn area then try to coontune the valve adjustment? Those are my ideas please if you have any others post them as soon as possible. Thanks

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Reply #1 - Jun 14^th, 2003 at 11:26am

Hagar Offline
Colonel
My Spitfire Girl
Costa Geriatrica

Posts: 33159

Glitch. Is the stud threaded at both ends? If so you could try using 2 nuts tightened together - then unscrew it with a spanner on the lower one. Spray all round the stud liberally with something like WD 40 first. It might work depending on how tight it is. Please be careful as you could snap it right off or strip the thread. I take no responsbility if anything goes wrong. Roll Eyes

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Reply #2 - Jun 14^th, 2003 at 11:29am

Fozzer Offline
Colonel
An elderly FS 2004 addict!
Hereford. England. EGBS.

Posts: 24861

Hi Glitch....
You have a few choices to remove a broken threaded stud, or a stud with a stripped thread.

!: Use a stud extractor tool, (It grips the stud tightly when un-doing it).
2: saw off the stud level with the cylinder head. drill a hole in the centre, (of the correct size), and use a conical thread extractor tool.
3: Saw off the stud level with the cylinder head, drill out the thread with an ever increasing drill size just leaving the thread in the head, then carefully prise out the remaining stud.
4: Do the same as above but drill out the whole stud and re-lace it with a "Heli-coil", then screw in a new stud.

Which-ever way you do it generally requires a few special tools... Cry

...!

Best of luck...
Paul.
(England).

Blimey Doug....you beat me in the rush to the tool box... Grin

....

...

...!

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Reply #3 - Jun 14^th, 2003 at 6:32pm

Glitch Offline
Colonel
aka IRAF_Paddy
Birmingham, Alabama

Gender:
Posts: 464

The stud seems to be pressed in no threads are to be seen where the stud meets up to the head. That is also where the damage is, so I pulled the rocker arm next to it and checked the stud there. No sign of threads there either. Snapping the stud is what I am afraid of. The wear is a 1/8 inch trench worn into the lower side of the stud. Allowing the rocker arm to ride in the trench pivoting toward the front of the engine a couple of degrees, to push on the top of the spring retaining cap instead of the top of the valve.

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Reply #4 - Jun 16^th, 2003 at 9:43pm

Glitch Offline
Colonel
aka IRAF_Paddy
Birmingham, Alabama

Gender:
Posts: 464

I talked to a mechanic and the stack of washers was what he suggested. Worked like a charm now I have another prob seems the new Geforce fx cards are backwards compatible and the 5400 is comparable price wise to the G4 Ti 4600 decisions, decisions, decisions! thanks for the input guys! Glitch

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