Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine
Register Forgot Password?

Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by Weld Racing
Click Here

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 05-22-2010, 11:57 PM   #1
Senior Member
 
Awesome-X's Avatar
 
Join Date: Mar 2009
Location: Bloomfield, IN
Posts: 877
Car: 87 Camaro, 86 Trans Am
Engine: 305, 305
Transmission: 700R4

Classifieds Rating: (0)
Send a message via Yahoo to Awesome-X
Rocker arms keep coming loose.

I tightened my rocker arms down 1 turn past zero lash awhile back. After a week or so it started to sound like I had a bad exhaust leak.
I tightened them again last weekend, they were all loose except 1 and 1 of them had completely jumped off the push rod. Another one was loose enough that it was beating up the top of my valve cover.
Well, they're loose again and the car is running like crap.

What can I do to keep them down??
Awesome-X is offline vBGarage Page   Reply With Quote
Old 05-23-2010, 12:12 AM   #2
Moderator
 
Join Date: Jan 2002
Location: Moorestown, NJ
Posts: 9,930
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 2.77's

Classifieds Rating: (2)

Send a message via AIM to dimented24x7
Re: Rocker arms keep coming loose.

Use jamb nuts, or get new pinch type rocker nuts (summit, jegs, etc). Sounds like the current ones no longer hold the stud tight enough.

The jamb nuts are thin nuts that you tighten against the rocker nut to keep it in place. Theyre hard to tighten due to the lack of space, but they do work. The thread size you want is 3/8-24.
dimented24x7 is offline vBGarage Page   Reply With Quote
Old 05-26-2010, 07:22 PM   #3
Senior Member
 
Awesome-X's Avatar
 
Join Date: Mar 2009
Location: Bloomfield, IN
Posts: 877
Car: 87 Camaro, 86 Trans Am
Engine: 305, 305
Transmission: 700R4

Classifieds Rating: (0)
Send a message via Yahoo to Awesome-X
Re: Rocker arms keep coming loose.

Where can I get stuff like this from?
Awesome-X is offline vBGarage Page   Reply With Quote
Old 05-26-2010, 10:01 PM   #4
Supreme Member
 
brutalform's Avatar
 
Join Date: Jul 2004
Posts: 2,387

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

Quote:
Originally Posted by Awesome-X View Post
Where can I get stuff like this from?

Refer to post #2.
brutalform is offline vBGarage Page   Reply With Quote
Old 05-26-2010, 10:13 PM   #5
Senior Member
 
Awesome-X's Avatar
 
Join Date: Mar 2009
Location: Bloomfield, IN
Posts: 877
Car: 87 Camaro, 86 Trans Am
Engine: 305, 305
Transmission: 700R4

Classifieds Rating: (0)
Send a message via Yahoo to Awesome-X
Re: Rocker arms keep coming loose.

Can I get them from a local parts store is what I meant
Awesome-X is offline vBGarage Page   Reply With Quote
Old 05-26-2010, 10:47 PM   #6
Member
 
TNT_Z28's Avatar
 
Join Date: Apr 2008
Location: Minnesnowta
Posts: 360
Car: 1987 Camaro Z28
Engine: 355ci, XE262 , 650dp
Transmission: T-5, RAM clutch
Axle/Gears: 3.23 limited slip

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

You can get the jam nuts from a hardware store. the one i work at has them. also you might want to consider...

Do the heads you are using have pushrod guide plates? Do the heads youre using have slotted pushrod holes or round? Do you have self aligning rockerarms.
TNT_Z28 is offline vBGarage Page   Reply With Quote
Old 05-26-2010, 11:36 PM   #7
Senior Member
 
Awesome-X's Avatar
 
Join Date: Mar 2009
Location: Bloomfield, IN
Posts: 877
Car: 87 Camaro, 86 Trans Am
Engine: 305, 305
Transmission: 700R4

Classifieds Rating: (0)
Send a message via Yahoo to Awesome-X
Re: Rocker arms keep coming loose.

As far as I know it's all stock, it's a 350 that's been swapped in but the arms and pushrods are stock. The heads are 434 castings from a 305. I've been having problems with it overheating, if I put a thermostat in it it always overheats no matter what I do.
At about 210 the rockers start chattering.
Awesome-X is offline vBGarage Page   Reply With Quote
Old 05-27-2010, 10:32 AM   #8
Supreme Member
 
3rdgenmaro's Avatar
 
Join Date: Dec 2004
Location: Lincolnton, NC
Posts: 1,545
Car: 88 IROC
Engine: 97 5.7 Vortec LT4 hotcam
Transmission: 700 r4
Axle/Gears: 3.73

Classifieds Rating: (8)
Re: Rocker arms keep coming loose.

just throwing this idea out there..... but are you sure the nuts are loosening?

Make sure that the studs arent pulling or the cam isnt going flat. Either of those can cause the same symptoms.
__________________
88 Camaro, 97 5.7 vortec, lt4 hotcam, 4160 Holley 600, Pro Built 700r4, 3.73
85 S10, 350/350, 10.5:1, Dart Pro1 200Ps, 244/249@50, .565/.543, Air-Gap, 650 DP, 3000 stall, 3.42s
67 SS Chevelle, 396, 4 speed, 3.73
3rdgenmaro is offline vBGarage Page   Reply With Quote
Old 05-27-2010, 12:37 PM   #9
Senior Member
 
JakeJr's Avatar
 
Join Date: Jul 2000
Location: Kempner,TX,
Posts: 1,014
Car: 1996 Vette / 1992 GSX1100F Suzuki
Engine: 1996 Corvette Coupe 388 LT1 (+.060)
Transmission: Auto
Axle/Gears: 3.07

Classifieds Rating: (0)
Send a message via Yahoo to JakeJr
Re: Rocker arms keep coming loose.

I believe something else is going on here. Devil's in the Details.

Are the nuts actually moving? That is, moving up (backing off) the studs?

Are you running stock rocker arms?

How are you going about re-tightening the nuts once they've become loose?

When you adjust (tighten) them, you should be able to see a certain number of stud threads showing above the nuts. Now, when they become loose are there fewer threads showing?

I'm trying to figure out what's going on here.

BTW, auto parts stores sell new adjusting nuts. They, like stockers, are slightly oblong at the top of one end and it's that "oblongness" that keeps the nut from backing off. If the nuts have been tightened/loosened/re-tightened several times, that feature gets rounded off, so the nut can no longer reliably remain in place. Oblong works - round doesn't.

Jake
__________________
My son, Ryan M. Cameron, graduated from West Point on 22 May 2010! He was commissioned as a 2nd Lieutenant and I pinned on his first pair of "Butter Bars" PROUDEST DAY OF MY LIFE!!

1996 Corvette Coupe, 388 LT1 (+.060), 10.7 CR, AFR heads (304 cfm@.600), matching ported LT1 intake, CompCams HR (230/236@.050 113 LSA, .612/.610 Lift)

Last edited by JakeJr; 05-30-2010 at 01:34 PM.
JakeJr is offline vBGarage Page   Reply With Quote
Old 05-27-2010, 11:53 PM   #10
Senior Member
 
Awesome-X's Avatar
 
Join Date: Mar 2009
Location: Bloomfield, IN
Posts: 877
Car: 87 Camaro, 86 Trans Am
Engine: 305, 305
Transmission: 700R4

Classifieds Rating: (0)
Send a message via Yahoo to Awesome-X
Re: Rocker arms keep coming loose.

Guess they were still tight all along, I was just 3 quarts low on oil I just filled that last week and I don't see any on the ground and the car doesn't smoke.
Awesome-X is offline vBGarage Page   Reply With Quote
Old 05-28-2010, 02:28 PM   #11
Supreme Member
 
travis401's Avatar
 
Join Date: Mar 2007
Location: Arlington, Tx
Posts: 3,524
Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc

Classifieds Rating: (1)
Re: Rocker arms keep coming loose.

Being low on oil wouldnt affect your rocker arms at all. Unless your ground the lobes off your cam. Inadequate oil on the camshaft would allow friction between the lifter and cam lobe, causing the lobes to grind down, and destroying the lifters. Id pull the intake and pull a few lifters and check the bottom of them. I just had to replace my camshaft from a lifter failing and grinding off a lobe.
travis401 is offline vBGarage Page   Reply With Quote
Old 05-28-2010, 02:51 PM   #12
Supreme Member
 
ASE doc's Avatar
 
Join Date: Apr 2010
Location: Aurora, OR
Posts: 3,735
Car: 87 IROC Z28
Engine: 355 cid TPI, very built
Transmission: Pro Built Automatic w/3,500 stall
Axle/Gears: 3.27 Limited slip

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

Staying out of this discussion but congratulations to Jake Jr and his son. Awesome!
__________________
Half effort yields half results.

87 IROC Z28, 355 TPI, 10.2:1, 6" rods, balanced, clearanced, TFS G2 heads fully ported, ZZX Cam, ported Superram base, large tube runners, 1 3/4 pri coated stainless short tube, 58mmTB on ported plenum, ram air, high flow air lid, 24lb bosch @ 70 psi, ACCEL DFI, MSD D6, funct hood louvers, etc. SSM SFCs, Hotchkis rear links& strt twr brace, Eibach Sportline, Koni Red S&S, PST bushings, Ed's 13" w/WW 4 piston calipers in front, LS1s in back. GTA seats, MOMO wheel, B&M Megashifter

Last edited by ASE doc; 05-28-2010 at 02:52 PM. Reason: Specify name
ASE doc is offline vBGarage Page   Reply With Quote
Old 05-28-2010, 03:26 PM   #13
Supreme Member
 
Join Date: Jun 2009
Location: Mid West
Posts: 2,284
Car: '87 Camaro
Engine: '92 Carb'd 350
Transmission: 700r4
Axle/Gears: factory stock

Classifieds Rating: (3)
Re: Rocker arms keep coming loose.

Agreed to check rocker operation--
After adjusting rockers, pull the power feed from distributor
and have someone crank the motor.
Watch rockers for lift-- flat // worn lobes or bad lifters will
be evident.
t-top havoc is offline vBGarage Page   Reply With Quote
Old 05-28-2010, 06:21 PM   #14
Senior Member
 
JakeJr's Avatar
 
Join Date: Jul 2000
Location: Kempner,TX,
Posts: 1,014
Car: 1996 Vette / 1992 GSX1100F Suzuki
Engine: 1996 Corvette Coupe 388 LT1 (+.060)
Transmission: Auto
Axle/Gears: 3.07

Classifieds Rating: (0)
Send a message via Yahoo to JakeJr
Re: Rocker arms keep coming loose.

Quote:
Originally Posted by ASE doc View Post
Staying out of this discussion but congratulations to Jake Jr and his son. Awesome!
Thanks, *doc. I'll pass it along to Ryan, too.

Jake
JakeJr is offline vBGarage Page   Reply With Quote
Old 05-28-2010, 07:43 PM   #15
Senior Member
 
Join Date: Sep 2009
Location: Manchester,PA
Posts: 354
Car: 86 Firebird SE
Engine: 2.8L

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

It is possible that it may be the lash is improperly adjusted. The lifters must be full of oil and on the base circle of the camshaft for proper adjustment. To do this, start at one end of one of the cylinder banks. Turn the engine by hand until you see the rocker arm that you are adjusting rise all the way up(valve all the way closed). Then with the rocker arm loose, either move the pushrod up and down or spin it between your fingers while snugging the rocker arm nut down until you either just start to feel resistance(spinning the pushrod) or the pushrod just starts to not move up or down anymore. Then give the nut between a 1/2 to 3/4 turn and move onto the next one repeating the whole procedure on that valve. Its easier to start at the end of one bank and move down the line so you know what has been adjusted and what hasnt. I do this on my valves and have no issues at all or need any readjustments. I prefer the spinning the pushrod method as I can get a more accurate feel of where the lash is actually set.

Last edited by 86ttopbird; 05-28-2010 at 07:49 PM.
86ttopbird is offline vBGarage Page   Reply With Quote
Old 05-28-2010, 11:55 PM   #16
Senior Member
 
Awesome-X's Avatar
 
Join Date: Mar 2009
Location: Bloomfield, IN
Posts: 877
Car: 87 Camaro, 86 Trans Am
Engine: 305, 305
Transmission: 700R4

Classifieds Rating: (0)
Send a message via Yahoo to Awesome-X
Re: Rocker arms keep coming loose.

They weren't loose this time, it was just really low on oil which was causi g some chattering. I took my thermostat out so hopefully that will help with my cooling issues. It's good and driveable now.
The cam had one slightly worn lobe when I put it in, and the cam before that was completely wiped, along with 3 wiped lifters. It's a really old stock 350 cam and all the lifters are going as they should.
Awesome-X is offline vBGarage Page   Reply With Quote
Old 03-06-2011, 08:09 PM   #17
Junior Member
 
Join Date: Mar 2011
Posts: 6

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

i have a 1988 c 1500, i replaced a head, tightened the rocker arms. it ran great until i started it the next day. it had no power. what could be wrong.
rjd3165 is offline vBGarage Page   Reply With Quote
Old 03-06-2011, 08:36 PM   #18
Supreme Member
 
Join Date: Sep 2002
Location: Cary, North Carolina
Posts: 9,192
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi

Classifieds Rating: (0)

Send a message via AIM to camaronewbie
Re: Rocker arms keep coming loose.

rjd3165:

Welcome to TGO. You'll get better response by starting your own thread instead of hijacking this one - the few folks reading this thread are looking for info on rocker arms and why they loosen up on their own, where as you want more exposure by posting your own thread so more than just tyhose few folks see it.

And give us more detail, much much more detail. We need to know car year, induction system being used, what tranny, and exactly what you swapped and what you left as stock.

We're glad to try and help! But get your own thread out there on the top of the list so it's seen more!
__________________
1992 25th Anniversary RS T-Top
350 Carb 10:1 Dometops Mild Cam
Hedmann Headers Hi-Flo Cat/Aerochamber Muffler
700R4 B&M Shift Kit LS1 Disc Rear w/3.42 Posi
Poly Bushings Eibach Prokit Bilstein Shocks/Struts
HOK Candy Teal on Silver Flake IROC Hood
camaronewbie is offline vBGarage Page   Reply With Quote
Old 03-06-2011, 09:35 PM   #19
Junior Member
 
Join Date: Mar 2011
Posts: 6

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

i have a 1988 chevy c1500. i swapped the driver side head due to the stud coming up. its automatic and fuel injection bowl
rjd3165 is offline vBGarage Page   Reply With Quote
Old 03-07-2011, 08:39 AM   #20
Junior Member
 
Join Date: Mar 2011
Posts: 6

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

i had a stud come up on my 1988 c1500 on the head that i changed. what could be happening?
rjd3165 is offline vBGarage Page   Reply With Quote
Old 03-07-2011, 09:04 AM   #21
Supreme Member
 
Join Date: Feb 2006
Location: San Fernando Valley, Ca.
Posts: 1,475
Car: 67 El Camino
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

pressed in studs can do that and will make that loose sound, bend pushrods all kinds of fun stuff. Shouldnt do it with a stock cam but once you go up in size to a point you should be using screw in studs which means youll have to get them tapped

Take the rockers off and examine what you have carefully go from there.
cuisinartvette is offline vBGarage Page   Reply With Quote
Old 03-07-2011, 01:34 PM   #22
Junior Member
 
Join Date: Mar 2011
Posts: 6

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

i believe that water got into my oil from changing the head that it got into the piston chamber causing it to hydrolic which pushed it out.
rjd3165 is offline vBGarage Page   Reply With Quote
Old 03-15-2011, 09:53 PM   #23
Junior Member
 
Join Date: Mar 2011
Posts: 6

Classifieds Rating: (0)
Re: Rocker arms keep coming loose.

the gas in my tank was red but wasnt diesel. it would sit and run good but when i drove it, it didnt have power and would quit running. what could that be. i cleaned the tank. the gas looked like blood.
rjd3165 is offline vBGarage Page   Reply With Quote
Old 03-15-2011, 09:53 PM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine

Tags
350, adjusted, arm, arms, backing, bolt, coming, improperly, loose, loosened, nuts, overheating, rocker, rockers, symptins, symptoms, valves
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 03:57 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details