NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
ROCKER SHAFT BOLTS!!! AAAAAAHHHHHH!!!
Seriously! I spend 3 hrs. taking my rocker shafts on and off to fix the next stripped bolt hole. My favorite part is I would get them all in and be torquing them down for the last time and the LAST one, with out fail, would strip out. AAAAAAHHH!!!!!
OK If you are about to swap out anything on the rockershafts and you have to take them off. Save yourself a crapload of time and just go ahead and drill out and heli-coil them all right away. GEEZ!!! I swear! It's like screwing a bolt into icecream or candle wax!! Edited 1 time(s). Last edit at 10/06/2009 01:11PM by NixVegaGT. |
NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: ROCKER SHAFT BOLTS!!! AAAAAAHHHHHH!!!
There is little doubt in my mind that it would. I think it's the shear forces combined with the stress and out they come. I used some altra-slick assembly lube. That may have helped the last couple times in... 4 of the 8 holes are helicoils now. I know the helicoils make a stronger threaded hole so it's the other holes that are a problem now.
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Moderator Curtis Jacobson Portland Oregon (4598 posts) Registered: 10/12/2007 02:16AM Main British Car: 71 MGBGT, Buick 215 |
Re: ROCKER SHAFT BOLTS!!! AAAAAAHHHHHH!!!
Studs would definitely be better. The bolts haven't given me trouble personally, but I understand that one of these bolts tore loose on Jerry Richards' MGB GT V8 racecar at V.I.R. in June, and it ended his weekend early and in extreme frustration. (I think it was the rearmost bolt hole, by cylinder 7, and that the rocker shaft was damaged when it happened.)
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6508 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: ROCKER SHAFT BOLTS!!! AAAAAAHHHHHH!!!
Yep, that's about the most frustrating thing about these engines, and it's not just the rocker bolts either.
Jim |
hoffbug Tony Hoffer Minnesota (323 posts) Registered: 10/15/2007 05:25PM Main British Car: Olds 215 EFI |
Re: ROCKER SHAFT BOLTS!!! AAAAAAHHHHHH!!!
The T&D shaft rocker setup Im using on the Chevelle has a stud setup.. My springs are 530 Lbs open. so yeah I can definitely see the need for studs... ARP has a full line of fasteners.. Im sure it wouldnt take long to come up with the necessary part numbers to create a stud set for just about anything.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: ROCKER SHAFT BOLTS!!! AAAAAAHHHHHH!!!
Nic, Helicoils are only, slightly stronger than virgin threads. I suggest peeping "Timeserts",webbsite.In my mind their the best. Are you using the Volvo shafts and rockers? Studs, always best, when you add-up the "poundage" your compressing with minimal thread engagement, using bolts. I'm thinkin a"lip" on pushrod side of stand/bottom, might help. Good Luck, roverman.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6508 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: ROCKER SHAFT BOLTS!!! AAAAAAHHHHHH!!!
The oil goes around the bolts or studs.
Jim |
NixVegaGT Nicolas Wiederhold Minneapolis, MN (659 posts) Registered: 10/16/2007 05:30AM Main British Car: '73 Vega GT 4.9L Rover/Buick Stroker |
Re: ROCKER SHAFT BOLTS!!! AAAAAAHHHHHH!!!
I'm blocking off the oiling through the rocker shaft and oiling through the push rods instead. I had to shim up the rocker shafts and I used the shims to block the oil passage. This engine over oils the rocker shafts anyway so that will leave more for the mains!
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