Got a rocker problem..
Thread Starter
Safety Car
Joined: Apr 2008
Posts: 3,908
Likes: 10
From: Charleston SC
Got a rocker problem..
When I started up the car today, I heard a loud ticking noise..not a knock, but ticking. So I first checked the header bolts, and sure enough, they needed some tightening. Turned the car on, still ticking. Then I replaced the gasket which was worn out and needed replacing. Still ticking. Then I saw that where the side pipe and header meet, needed tightening..still ticking.
Then I took the valve cover off on the passenger side and found this gem:
What would cause this? Over-tightened rocker?
And what are the implications? Was that the source of the tapping? Can I simply buy a new rocker (set)?
Help me out guys..I'm trying to sell this car and want to get it back up and running quickly. Thanks for the help.
Then I took the valve cover off on the passenger side and found this gem:
What would cause this? Over-tightened rocker?
And what are the implications? Was that the source of the tapping? Can I simply buy a new rocker (set)?
Help me out guys..I'm trying to sell this car and want to get it back up and running quickly. Thanks for the help.
Race Director
Joined: May 2006
Posts: 18,626
Likes: 2,553
Without knowing the full history of the engine difficult to come up with the exact answer. if original from 1968 just worn out. I would check the rocker arm stud to see if there is a groove worn on the side of it from the rocker being cocked at that angle. Depending on how far you want to go, at the very least replace the rocker arms and any worn rocker arm studs. Ideally you should have the heads converted to screw in rocker studs with pushrod guides. Obviously change the oil and filter no matter what you do.
Last edited by MelWff; Dec 14, 2011 at 03:40 PM.
Thread Starter
Safety Car
Joined: Apr 2008
Posts: 3,908
Likes: 10
From: Charleston SC
Doesn't appear so. I looked at it all around, as well as pressed down on it a little. Doesn't seem like anything else is messed up..
Would this work as a replacement?
http://www.summitracing.com/parts/CCA-1212-1/?rtype=10
:EDIT:
I see that the above stud size is not 5/8...
Would this work as a replacement?
http://www.summitracing.com/parts/CCA-1212-1/?rtype=10
:EDIT:
I see that the above stud size is not 5/8...
Last edited by Birdman; Dec 14, 2011 at 03:45 PM.
Race Director
Joined: May 2006
Posts: 18,626
Likes: 2,553
Last edited by MelWff; Dec 14, 2011 at 03:48 PM.
Thread Starter
Safety Car
Joined: Apr 2008
Posts: 3,908
Likes: 10
From: Charleston SC
Without knowing the full history of the engine difficult to come up with the exact answer. if original from 1968 just worn out. I would check the rocker arm stud to see if there is a groove worn on the side of it from the rocker being cocked at that angle. Depending on how far you want to go, at the very least replace the rocker arms and any worn rocker arm studs. Ideally you should have the heads converted to screw in rocker studs with pushrod guides. Obviously change the oil and filter no matter what you do.
And keep in mind I don't have money anymore..and so I'm not looking to convert anything, or even improve. Simply get working again.
And do you think that tapping was from the rocker, or the pieces from the rocker?
Race Director
Joined: May 2006
Posts: 18,626
Likes: 2,553
It was from the rocker but you need to replace all of them. This would be a better choice
http://www.summitracing.com/parts/CCA-1412-16/
This is the cheaper choice
http://www.summitracing.com/parts/CCA-1212-16/
http://www.summitracing.com/parts/CCA-1412-16/
This is the cheaper choice
http://www.summitracing.com/parts/CCA-1212-16/
Last edited by MelWff; Dec 14, 2011 at 03:53 PM.
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Drifting
Joined: Jan 2002
Posts: 1,645
Likes: 11
From: Schaumburg IL
Understand you dilemma on this $$ issue. If not replacing all rockers, yes the bare bones Summit with ball and nut will work. As an alternative to save some $$ ck out some of the local machine shops that build engines and I bet they have some old 1.6 rockers, ***** and nuts laying around that they might just give you one.
Thread Starter
Safety Car
Joined: Apr 2008
Posts: 3,908
Likes: 10
From: Charleston SC
-I'm supposed to get roller tips, instead of non-roller like what's in there now?
-Rocker arm ratio is 1.52?
-Stud size is 3/8"? Am I thinking of the same thing? The nut that I took off of the rocker was 5/8..
-Long slot style instead of standard?
Race Director
Joined: May 2006
Posts: 18,626
Likes: 2,553
I'm supposed to get roller tips, instead of non-roller like what's in there now?
-Rocker arm ratio is 1.52? Correct slight performance increase
-Stud size is 3/8"? Am I thinking of the same thing? The nut that I took off of the rocker was 5/8.. The stud is 3/8 in diameter not the nut.
-Long slot style instead of standard? The part number I posted had only one type of slot
-Rocker arm ratio is 1.52? Correct slight performance increase
-Stud size is 3/8"? Am I thinking of the same thing? The nut that I took off of the rocker was 5/8.. The stud is 3/8 in diameter not the nut.
-Long slot style instead of standard? The part number I posted had only one type of slot
Thread Starter
Safety Car
Joined: Apr 2008
Posts: 3,908
Likes: 10
From: Charleston SC
Awesome, I appreciate all of the help, and thanks for bearing with me, I'm still learning.
Will these work fine? And which means more performance as you stated, 1.5 or say 1.6?
http://www.summitracing.com/parts/MAN-43140/?rtype=10
Will these work fine? And which means more performance as you stated, 1.5 or say 1.6?
http://www.summitracing.com/parts/MAN-43140/?rtype=10
Racer
Joined: Feb 2011
Posts: 384
Likes: 0
From: Northern New Jersey
Safety Car
Joined: Mar 2009
Posts: 3,558
Likes: 4
From: Oakland California
Instructor
Joined: Nov 2011
Posts: 228
Likes: 0
there is no way that valve stem doesn't have damage.
If you replace just the rocker you will be doing it again very soon with the valve and possibly other parts as well.
The rocker would have had to be in a bind to do that. Does the head have guide plates? Are they worn?
If you replace just the rocker you will be doing it again very soon with the valve and possibly other parts as well.
The rocker would have had to be in a bind to do that. Does the head have guide plates? Are they worn?
Burning Brakes
Joined: Feb 2005
Posts: 894
Likes: 91
Valve/rocker damage
Just a "heads-up", the rocker in the photo to the left of the broken one appears to also have an issue!
Tough to tell from the photo, but something doesn't look right?
Thanks, Gary in N.Y.
P.S. I would recommend checking for possible "flat" cam lobes AND incorrect (late) ignition timing!
Tough to tell from the photo, but something doesn't look right?
Thanks, Gary in N.Y.
P.S. I would recommend checking for possible "flat" cam lobes AND incorrect (late) ignition timing!
Thread Starter
Safety Car
Joined: Apr 2008
Posts: 3,908
Likes: 10
From: Charleston SC
Just a "heads-up", the rocker in the photo to the left of the broken one appears to also have an issue!
Tough to tell from the photo, but something doesn't look right?
Thanks, Gary in N.Y.
P.S. I would recommend checking for possible "flat" cam lobes AND incorrect (late) ignition timing!
Tough to tell from the photo, but something doesn't look right?
Thanks, Gary in N.Y.
P.S. I would recommend checking for possible "flat" cam lobes AND incorrect (late) ignition timing!
And Gary, now you've got me worried.. is it because it appears misaligned? How do you correct that?
How do I check for flat cam lobes? I know of them and the issue, and have been using recommended oil.. And the timing has been done by me multiple times, so I'm fairly certain it is correct..
Thread Starter
Safety Car
Joined: Apr 2008
Posts: 3,908
Likes: 10
From: Charleston SC
there is no way that valve stem doesn't have damage.
If you replace just the rocker you will be doing it again very soon with the valve and possibly other parts as well.
The rocker would have had to be in a bind to do that. Does the head have guide plates? Are they worn?
If you replace just the rocker you will be doing it again very soon with the valve and possibly other parts as well.
The rocker would have had to be in a bind to do that. Does the head have guide plates? Are they worn?
Could you elaborate on the valve stem?
I don't believe the heads have guide plates..what do they look like?
And to address someone else's question, the pushrods appear fine and straight..