Rocker arm rubbing valve spring cap
08-15-2014, 09:34 PM
#1
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Rocker arm rubbing valve spring cap I just pulled my valve cover off because i heard a ticking noise at about 2k rpm.The valvespring caps are all marred up. what could this be from? I installed the brute speed blower cam the comp 26926-16ti valve springs and 7.40 comp pushrods. Ive had the valve springs, pushrods, cam all installed and have been drivin on for about 2000 miles
08-15-2014, 09:43 PM
#2
You should have a ton more clearance than that between the body and the retainer. What's the installed height of the valve springs? Are you using longer than stock valve stems?
Best pics I have of mine where you can clearly see the spacing:
Best pics I have of mine where you can clearly see the spacing:
Last edited by JakeFusion; 08-15-2014 at 09:49 PM.
08-15-2014, 09:46 PM
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i just pulled my valve cover off because i heard a ticking noise at about 2k rpm.the valvespring caps are all marred up. What could this be from? I installed the brute speed blower cam the comp 26926-16ti valve springs and 7.40 comp pushrods. Ive had the valve springs, pushrods, cam all installed and have been drivin on for about 2000 miles
beehive springs and retainers!!
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08-15-2014, 10:57 PM
#8
Correct.
Look at the pedestal.
It appears to be cracked in the picture. It also appears that specific rocker arm is sitting lower than it should compared to the next one. Look at how the rocker arm is sitting on that valve tip.
I bet the issue might be there.
Also you should check the installed height to make sure everything is correct.
Look at the pedestal.
It appears to be cracked in the picture. It also appears that specific rocker arm is sitting lower than it should compared to the next one. Look at how the rocker arm is sitting on that valve tip.
I bet the issue might be there.
Also you should check the installed height to make sure everything is correct.
08-15-2014, 11:06 PM
#9
In the first picture, it looks like the pedestal is cracked. I would start by pulling all the rocker arms and the pedestal base off for a careful inspection.
If you are still using the stock valves in the stock unworked heads, then installed height of the spring won't really matter for this clearance issue. It's important for other reasons, but won't solve your clearance issue.
If you replaced the valves, then you may have installed one's that are too long, and the upper tip is too high. If they are stock valves, then the machinist may have cut the seats and valve faces too much; which raises the tip.
If the heads and valves are all stock, and there's nothing wrong with the pedestals, then you installed springs that are a little bit to big in diameter. You have a couple of options that may or may not work.
If you really need that much spring pressure, then you can try shimming up the rocker arms a little bit. If you do that, you'll need longer push rods. Be sure and check the tip pattern to be sure you can get away with that.
The other option is to convert to aftermarket rockers that are made for springs that big. Considering your spring pressures, that would be the better option IMO.
If you are still using the stock valves in the stock unworked heads, then installed height of the spring won't really matter for this clearance issue. It's important for other reasons, but won't solve your clearance issue.
If you replaced the valves, then you may have installed one's that are too long, and the upper tip is too high. If they are stock valves, then the machinist may have cut the seats and valve faces too much; which raises the tip.
If the heads and valves are all stock, and there's nothing wrong with the pedestals, then you installed springs that are a little bit to big in diameter. You have a couple of options that may or may not work.
If you really need that much spring pressure, then you can try shimming up the rocker arms a little bit. If you do that, you'll need longer push rods. Be sure and check the tip pattern to be sure you can get away with that.
The other option is to convert to aftermarket rockers that are made for springs that big. Considering your spring pressures, that would be the better option IMO.
08-15-2014, 11:06 PM
#10
In the first picture, it looks like the pedestal is cracked. I would start by pulling all the rocker arms and the pedestal base off for a careful inspection.
If you are still using the stock valves in the stock unworked heads, then installed height of the spring won't really matter for this clearance issue. It's important for other reasons, but won't solve your clearance issue.
If you replaced the valves, then you may have installed one's that are too long, and the upper tip is too high. If they are stock valves, then the machinist may have cut the seats and valve faces too much; which raises the tip.
If the heads and valves are all stock, and there's nothing wrong with the pedestals, then you installed springs that are a little bit to big in diameter. You have a couple of options that may or may not work.
If you really need that much spring pressure, then you can try shimming up the rocker arms a little bit. If you do that, you'll need longer push rods. Be sure and check the tip pattern to be sure you can get away with that.
The other option is to convert to aftermarket rockers that are made for springs that big. Considering your spring pressures, that would be the better option IMO.
If you don't need that much spring pressure, then look for some new springs that are not as big around. I'm also a fan of beehive springs.
If you are still using the stock valves in the stock unworked heads, then installed height of the spring won't really matter for this clearance issue. It's important for other reasons, but won't solve your clearance issue.
If you replaced the valves, then you may have installed one's that are too long, and the upper tip is too high. If they are stock valves, then the machinist may have cut the seats and valve faces too much; which raises the tip.
If the heads and valves are all stock, and there's nothing wrong with the pedestals, then you installed springs that are a little bit to big in diameter. You have a couple of options that may or may not work.
If you really need that much spring pressure, then you can try shimming up the rocker arms a little bit. If you do that, you'll need longer push rods. Be sure and check the tip pattern to be sure you can get away with that.
The other option is to convert to aftermarket rockers that are made for springs that big. Considering your spring pressures, that would be the better option IMO.
If you don't need that much spring pressure, then look for some new springs that are not as big around. I'm also a fan of beehive springs.
08-15-2014, 11:14 PM
#11
Something is definitely up with the rocker pedestal. The whole rocker is way too low and there does appear to be a crack. Looks like you have the Trunion upgrade as well. I'd pull that rocker and check the trunion to see if it's worn at all and then take a closer look at the pedestal.
If all is okay, you'll need to check the installed height to verify that you're valve is sitting properly in the head. As bob noted and I asked earlier, the only real way to get a longer valve is via an aftermarket valve or through machining.
If all is okay, you'll need to check the installed height to verify that you're valve is sitting properly in the head. As bob noted and I asked earlier, the only real way to get a longer valve is via an aftermarket valve or through machining.
08-16-2014, 08:23 AM
#12
It seems there could be several problems, but I would still recommend that you check the installed height. The valve tips look sunken into the retainers like the wrong locks were used. This could potentially cause the retainers ("caps") to have a taller installed height and less clearance between the rocker arm.
You'll need to use an installed height micrometer, similar to the one pictured below:
You'll need to use an installed height micrometer, similar to the one pictured below:
08-16-2014, 01:18 PM
#13
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im back at the car right now and the pedestal doesnt appear to be cracked it looks like a casting mark, but im going to clean it up some more and take a better looks at it. Im also trying to get my hands on a install height micrometer
08-16-2014, 04:30 PM
#16
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If the only problem is that that they are rubbing- I'd pull all the spring caps off and have a machinist put a large chamfer on the OD. it looks like they only juuust touch so this may gain you enough clearance.
But I'm cheap like that.
But I'm cheap like that.
08-16-2014, 05:36 PM
#20
Were these heads worked? If you have then the rocker may have been sunk farther into the seat and the valve tip becomes higher. The rocker tip is also far to the intake side of the valve stem closed.
As others have stated, you need to take a bunch of measurements to figure out the exact problem and go from there.
What is the setup?
As others have stated, you need to take a bunch of measurements to figure out the exact problem and go from there.
What is the setup?