You ever have days like this? - Team Camaro Tech
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post #1 of 6 (permalink) Old Aug 2nd, 03, 10:30 AM Thread Starter
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Denis
 
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I inadvertently loosened a screw-in rocker stud (#1 exhaust) while adjusting valve lash.

After running for a few minutes then shutting down because of the racket, I pulled the valve cover to see what the heck was up. The stud had pulled out of the head maybe a 1/2". Lots of coolant was seeping up through the rocker stud bore, and had contaminated the oil. When I pulled the stud, coolant really came out for a couple of minutes.

I know, I know, I have a problem. Besides the fact that the valve train was noisy, I could hear knocking (first I thought my timing was off but that wasn't it), my exhaust valve was probably getting the crap beat out of it, is it "normal" that the rocker stud bore be open to the coolant passages?

My first reaction is to change the oil, coat the studs with red Loctite and torque them all down properly (50 ft lbs)?, then re-install the lifters and re-adjust lash. After getting it running again, do a compression test to see if the valves or valve seating were affected. And hope that all is well.

Or should I pull the head(s) before causing further damage?

Sigh. I hope you all have a nice time at the All-Chevy show...
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post #2 of 6 (permalink) Old Aug 2nd, 03, 02:27 PM
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Chad
 
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Everybody has days like that. The rocker studs do go into the water jackets in the heads no problem there.The noise was probably just the extra clearance between the rocker, valve tip and push rod. I would torque the studs set the valves and go for a drive.Change the oil to get the water out.

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post #3 of 6 (permalink) Old Aug 2nd, 03, 03:53 PM Thread Starter
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Denis
 
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I was hoping you might say that
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post #4 of 6 (permalink) Old Aug 2nd, 03, 04:17 PM
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Bill
 
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Denis,
Loctite is not the best sealer in the world. I use Permatex White Teflon sealer on the ones I do. If they are torqued properly, they should not come loose.

Bill Koustenis
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1971 Chevelle "Heavy Chevy" original owner


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post #5 of 6 (permalink) Old Aug 3rd, 03, 08:06 AM
 
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Angry

I always put a daud of good old "Indianhead" shellac gasket cement on the studs just like I do all my head bolts and it's always worked great for me!!

I'm not too sure the old fashioned stuff isn't really Permatex #3 or something like that?? I would have to look the little shoe polish bottle over real close to see...

pdq67



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post #6 of 6 (permalink) Old Aug 3rd, 03, 12:22 PM Thread Starter
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Denis
 
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I cleaned the studs, used the Permatex white teflon thread sealant, and torqued to 50 ft lbs. Then I adjusted lash (set it cold to .026 intake and exhaust for the 346 30-30 cam w/ 1.5 rockers). Problem solved. Thanks, guys.
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