07-28-2019, 06:06 PM | #1 |
Drives: 2017 Camaro SS/ Nightfall gray Join Date: Sep 2016
Location: Saint Augustine,Florida
Posts: 33
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Crank won't turn when installinf rockers. HELP!
I need help with my cam install. After I install my rockers and go to turn the crank, it will turn a little then stuck. I removed the rockers leaving the rods in and it turns freely. So install 3 of the rockers only to test it, when I turn it turns but when it gets where it presses the spring the crank gets hard but it turns. Once it the springs come up then it turns freely again. I have no idea what could it be, please help, thanks.
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07-28-2019, 06:51 PM | #2 |
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Drives: 2012 2SS CAMARO 45th Join Date: Apr 2011
Location: St. Charles, IL
Posts: 18,663
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Is it just building compression and getting difficult? Try taking the plugs out.
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07-28-2019, 06:55 PM | #3 |
Because Racecar!
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either we assume timing is correct and you are turning against compression.
-or- the pistons are contacting the valves unable to make it to top dead center by the open valve. first option is normal and good. second is a bummer and expensive if forced. If it still binds up completely assembled with spark plugs removed then you will want to recheck timing or pushrod locations (if they are different lengths for intake/exhaust). |
07-28-2019, 09:12 PM | #4 |
Drives: like an old lady Join Date: Jun 2012
Location: indiana
Posts: 2,396
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pushrods too long?
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07-28-2019, 10:36 PM | #5 |
The Green Hornet
Drives: 2020 Rally Green 2SS 1LE Join Date: Apr 2019
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X2
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07-29-2019, 04:32 AM | #6 |
Drives: like an old lady Join Date: Jun 2012
Location: indiana
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07-30-2019, 11:42 AM | #7 |
Drives: 2017 Camaro SS/ Nightfall gray Join Date: Sep 2016
Location: Saint Augustine,Florida
Posts: 33
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07-30-2019, 10:10 PM | #8 |
Drives: 2017 2SS M6 Join Date: Jun 2013
Location: WNY
Posts: 7,070
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what cam specs? did you use a torque wrench and torque the rockers to 22ftlbs when each cylinder was at top dead center? The cam has to be on the base of the cam lobe befor you can torque the rocker down. what push rod length?
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07-31-2019, 08:17 PM | #9 |
Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017
Location: North Ga
Posts: 1,787
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Your valves are hitting the pistons, no doubt about it. Did you mill the heads or deck the block?
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07-31-2019, 08:23 PM | #10 |
Drives: 2017 1SS Hyper Blue Join Date: Apr 2017
Location: Wisconsin
Posts: 478
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I would suggest you stop and take it to a reputable builder. From your descriptions it sounds like your valves and pistons are trying to occupy the same space, not good.
There’s a good chance you’ve already bent some valves, so I foresee an expensive lesson learned, but I hope for your sake I’m wrong! Good luck! |
07-31-2019, 08:26 PM | #11 |
Drives: 2017 1SS Hyper Blue Join Date: Apr 2017
Location: Wisconsin
Posts: 478
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07-31-2019, 09:41 PM | #12 |
Drives: Chevy Camaro Join Date: Jul 2019
Location: Dallas
Posts: 420
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What JC Cunningham said,
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07-31-2019, 10:18 PM | #13 |
Drives: 2013 Triple Black ZL1 Vert M6 ECF Join Date: Mar 2011
Location: Trenton, Michigan
Posts: 7,047
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One 'possibility' is that the new rocker arms are a different ratio, increasing the distance the valves travel enough to contact the pistons?
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08-01-2019, 12:43 AM | #14 |
Drives: like an old lady Join Date: Jun 2012
Location: indiana
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