Broken intake rocker arms
#1
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Join Date: 09-20-17
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Broken intake rocker arms
I just got a 06 cobalt ss for a cheep price do to it having a "motor issue" I get home and take the valve cover off to see that every rocker arm on the intake side was broke. They were in pieces all on the top of the head. I'm not use to these super charged 2.0 motor I'm more familiar with the older sbc. I was wondering if somebody on here could help me out and give me some advice on what could have caused that and what I would have to do to get it fixed before I start tearing into it.
#3
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Over revving is usually the cause. Check the valve springs for breaks. They can be replaced by loosening the camshaft bearing caps evenly across the head a bit at a time till you gain room to pivot them out/in. Then tighten in even small increments. Maybe try sweeping head and valve pockets with a strong magnet also. I just re-read that. Every one? I wonder if it skipped time and the valves met the piston?
#4
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Over revving is usually the cause. Check the valve springs for breaks. They can be replaced by loosening the camshaft bearing caps evenly across the head a bit at a time till you gain room to pivot them out/in. Then tighten in even small increments. Maybe try sweeping head and valve pockets with a strong magnet also.
#5
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iTrader: (29)
I over revved my old 2.2 and it lifted 6 rockers. I did what cw383 did and slowly loosen the cam caps and placed the rockers back under. I put a zip tie on each cam gear so the timing chain did not come off. Take your time and don't rush and you should be good and not have to retime the motor.
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jdbaugh1 (09-21-2017)
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jdbaugh1 (09-21-2017)