NoRotors.com - RX7 Engine Swap Forum
Technical Information => Drivetrain => Topic started by: mpcv2000 on April 22, 2012, 03:26:28 PM
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I have a set of 1.60 Roller Rocker from COMP Cams on my stoked LT4 using a 7/16" stud and this weekend a nut came lose making some nasty noises.
I have no damage because I've stopped the car right away.
I've try to re-tork it using the the Shbox write up and even before applying any pressure on the PolyLock it broke right off.
I'll suspect it cracked and came lose but anyway , I've been driving the car for 17,000 KM and this is the first issue I have had with the new motor so far.
Since I'm not too sure of the exact part number of the Roller Rocker and studs I have I ask you guys to give me your inputs.
Here's what I found out when I've removed the valve covers :
(http://im1.shutterfly.com/media/47a2da01b3127cceffbc6c00127600000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
It was holding there by 2 or 3 threads.
(http://im1.shutterfly.com/media/47a2da01b3127cceffbc5f24d3e300000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
I was barely starting to tight the Polylock ( 1/8 to 1/4 turn procedure ) and it broke .
(http://im1.shutterfly.com/media/47a2da03b3127cceffb98d86c20d00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da03b3127cceffb873cde27500000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da03b3127cceffb85a88238c00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
I'd like to order 1st thing tomorrow morning what I need to get me back on the road but I'm not too sure if the replacement part I've found is the right one.
I think I need 1401B-1 (..PolyLock search on CompCams web site ..) (http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=SRCH&Store_Code=CC) .
Am I right ?
Thanks.
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I'd call Comp, they might just send you a new one.
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I will give them a call tomorrow.
Someone on LS1Tech found the part number I'm looking for .
Part number needed 4603-16 .
(http://static.summitracing.com/global/images/prod/large/cca-4603-16.jpg)
Rocker Arm Nuts, Magnum, Roller Rockers, 7/16 in.-20 Thread, .6752 in. Outside Diameter, Set of 16
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Thursday evening .
I'm getting ready to re-assemble my top end ( if I can say ) and I've ordered the wrong PolyLocks .
Maybe I have a older sets of 1.6 Roller Rockers and the PolyLock are different ?
Anyway here's what I've got :
(http://im1.shutterfly.com/media/47a2da04b3127cceffa69dffe9a300000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da04b3127cceffa70970481a00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
Right is the new one ( obvious ) ;)
(http://im1.shutterfly.com/media/47a2da04b3127cceffa7b8ed897700000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da04b3127cceffa7a116482800000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
Now left is the new one.... :secret:
(http://im1.shutterfly.com/media/47a2da04b3127cceffa6fc44288000000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da04b3127cceffa7163108cc00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da04b3127cceffa6e82da9d300000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da04b3127cceffa6b246a99500000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da04b3127cceffa7376f481a00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da04b3127cceffa63c7fa9eb00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
I was hoping my car will be running tonight but looks like it won't happen.
I have also someone at CompCams that is aware of what I'm looking for so I hope I'll get the right part number before noon tomorrow so I can get the part on Friday.
:drive:
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With what I know now I went back on COMPcams (http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=4600-16&Category_Code=) web site and found the right one I think :
(http://www.compperformancegroupstores.com/store/graphics/00000001/4600-16_600.jpg)
Rocker Arm Style : Full roller
Rocker Arm Nut Style : Polylock
Rocker Stud Thread Diameter : 7/16-20 in.
Overall Height (in) : 1.000 in.
Outside Diameter (in) : 0.600 in.
For Use with Stud Girdle :No
This time I've mesured the nut and they matches what's above.
I should have done that yesterday......:(
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Wow. Good thing it broke while you were tightening it.
I had a rocker stud snap at 7000 RPM and caused "Bikedad Go Boom" thread.
My engine having solid lifters has me adjusting them every 2000 miles or so. I don't mind it though. I like tinkering around in the engine and this way I find the weak points before they happen. (Hopefully ;))
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Wow. Good thing it broke while you were tightening it.
I had a rocker stud snap at 7000 RPM and caused "Bikedad Go Boom" thread.
It broke at the track ( around 6,000RPM ) my guess .
I traillered the car back home.
I realized it was broken when I've tried to torque it.
1st I thought it just got lose somehow.
My guess is I have no motor damage but I haven't started the car since it is still not fixed.
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You're probably fine with your motor.
When my rocker stud snapped the car backfired and blew the intake manifold gasket out at the water jacket. I was just coming into the traps when it happened.
It flooded cylinder 3 and hydro-locked it. Lot's of smoke and noise when it went.
That's when I decided to go the stroker route.
Comp Cams sent me new improved rocker studs. That's what I have now.
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Got the kit today 4600-16 .
(http://im1.shutterfly.com/media/47a2da06b3127cceffa2305b199000000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
They are not the right one again.
I need to have the machined end to fit the 1.6 Roller Rocker grove.
(http://im1.shutterfly.com/media/47a2da06b3127cceffa327b079a400000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da06b3127cceffa3a02cb8d300000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
Like you can see the old one fits into the grove perfectly .
(http://im1.shutterfly.com/media/47a2da06b3127cceffa2f553596200000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
The new one are a too big .
(http://im1.shutterfly.com/media/47a2da06b3127cceffa3377c796000000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
I said fuk it I'm not going to wait another week so I grinded it down....
(http://im1.shutterfly.com/media/47a2da06b3127cceffa2885b19cc00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
Now it fits perfectly. ( not nice but....)
(http://im1.shutterfly.com/media/47a2da06b3127cceffa2e65a19fa00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da06b3127cceffa2eab2191400000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
Back together.
(http://im1.shutterfly.com/media/47a2da06b3127cceffa3676a795e00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
(http://im1.shutterfly.com/media/47a2da06b3127cceffa31d66f85f00000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)
I've started the motor and it runs perfectly , like before.
I'm very happy I haven't broke anything.
(http://im1.shutterfly.com/media/47a2da06b3127cceffa28750595800000030O00Act3LNk5YuGIPbz4E/cC/f%3D0/ps%3D50/r%3D0/rx%3D720/ry%3D480/)