3/8 screw in stud broke

Re: 3/8 screw in stud broke

Postby teggersmx » June 14th 2014, 12:55am

WELP, here's an update.

I have about 3k miles on it now and lost another stud.

Knowing the history in this topic, does anyone have a suggestion as to what direction to go to solve this problem?

I would hate to pull the engine for a machine shop evaluation.....
Thanks folks....
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Re: 3/8 screw in stud broke

Postby paulo57509 » June 30th 2014, 2:55am

I'd suggest reading through these articles and make sure that you've checked off everything that needs to be checked off.

Understanding what you're dealing with is the first step towards a good diagnosis.

I hope the links are helpful.

http://forum.grumpysperformance.com/vie ... f=52&t=181
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Re: 3/8 screw in stud broke

Postby DRZ » July 1st 2014, 5:59pm

What rocker ratio and are the slots in the rocker long enough to not be binding on the stud?
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Re: 3/8 screw in stud broke

Postby teggersmx » July 3rd 2014, 8:35pm

Thanks for your time......the engine is still apart.......deciding on a direction to move forward.

This is all the info I found on this site about this problem.......all cut and pasted together for this one post. The following is not anything I have done, only what the the builder has posted in several diffrent place in this forum about this recurring problem.

BELOW IS FROM THE BUILDER.

I used this cam. Summit racing.
Chevrolet Performance Hydraulic Roller Camshafts 14097395
Intake Duration at 050 inch Lift 196
Exhaust Duration at 050 inch Lift 206
Duration at 050 inch Lift 196 int./206 exh.
Advertised Intake Duration 288
Advertised Exhaust Duration 308
Advertised Duration 288 int./308 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.431 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.451 in.
Valve Lift with Factory Rocker Arm Ratio 0.431 int./451 exh. lift
Lobe Separation (degrees) 109

I used 1.6 roller tipped rockers

and these springs http://www.summitracing.com/parts/SUM-174000/
Outside Diameter of Outer Spring (in) 1.260 in.
Damper Spring Included Yes
Spring Rate (lbs/in) 358 lbs./in.
Inside Diameter of Outer Spring (in) 0.875 in.
Valve Spring Style Standard
Coated No
Retainers Included Yes
Retainer Material Steel
Locks Included Yes
Lock Style 7 degree
Lock Groove Quantity 1-groove
Lock Material Steel
Quantity Sold as a kit.
Notes Designed for Chevy small block applications. 0.550 in. maximum lift. installed at 1.750 in. Includes Viton valve stem seals.


Ok i figured out why the stud broke ( I think ). On the drivers side of the engine the only valve that is oiling is the #1 exhaust valve. The rest are not oiling. I've pulled all the pushrods and checked to see if they are clogged and they are not. I'm not sure about the pass side of the engine I haven't pulled the valve cover off of that side yet. Anyone have any ideas on why this is happening? The lifters were new and from the looks of the rocker arm balls they have never oiled ( they are blue from heat )
Ok i figured out why the stud broke ( I think ). On the drivers side of the engine the only valve that is oiling is the #1 exhaust valve. The rest are not oiling. I've pulled all the pushrods and checked to see if they are clogged and they are not. I'm not sure about the pass side of the engine I haven't pulled the valve cover off of that side yet. Anyone have any ideas on why this is happening? The lifters were new and from the looks of the rocker arm balls they have never oiled ( they are blue from heat )
I'm not sure what i should do. Now that I know that there was an oil issue with the lifters. Is it poss that the reason for the stud breakage was caused by lack of oil to the rockers and not because of spring bind? I would like to continue using the 1.6 rockers.
I did take the top end apart the only thing that myself or the machine shop guy could find was a little rocker arm ball wear. The lifters that came from ebay were labled sealed power on the carton but look nothing like the set of sealed power lifters i bought from NAPA on saturday and they are the same part #. I haven't taken the old lifters apart yet to see what the problem was with them. i should have it back together this afternoon enough to see if these lifter are working, using the 1.52 rockers
cam lobes show now signs of wear they look as good now as the day it was installed
I think I know why the lifter were not pushing oil to the top end. Look at the pic below. I didn't notice it at first but all of the nonworking lifter were alike and the only working lifter was different. Not sure why this difference effected it but apparently it does. I bought this set of lifters off of ebay and the guy said they were new sealed power lifters. The set of sealed power that i just bought from NAPA all look like the one working lifter
Ok update on what or why. I took the lifters to my buddies machine shop this evening and when he took apart the faulty lifter it made him scratch his head. He said he has never seen a design like this before but thought that is should still work. He said normally piece 2 has a small raised ring pressed into it with a channel on either side for oil to flow. So he put it back together and put about 35 psi of air pressure to the oil hole and air flowed through it. He then cranked the pressure up to 50 psi and the lifter locked up ( no air would flow through it) apparently there is a metal plate that acts like a check valve (piece 2) that keeps the oil from draining out of the lifter when the engine isn't running and when running it is pushed up to ride on the bottom of (piece 1) which is concaved to ollow oil to flow around piece 2 and flow through piece 1 and up the pushrod. What is happening is piece 2 is bending just enough under pressure to seal it and not allow oil to flow around it. I hope this all makes sence to you guys I couldn't figure out how else to explain it.

Ok finally had some good weather and was able to fix the problem. New Hyd roller lifters fixed the prob.
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