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#20618 01/27/2002 1:41 AM | Joined: Jan 2002 Posts: 32 Member | | Member Joined: Jan 2002 Posts: 32 | First of all I want to say that I have been reading The Stovebolt Page for about a year now and I have picked up a lot of information from all of you. Thanks.
But now I have a question of my own. I have a 1954
3100 with a 235 with fentons and a stock intake with carb. I have been running this setup for about a year and a half with no problems, but recently I started to notice a clatter under accelaration and it seems to be in the valve/rocker area. I did the tune up to specs and also checked it with a vacume gauge. The gauge would would not hold steady it would tick back and forth a slight bit at a regular interval. I also noticed that back at the exhaust pipes I could put my hand in front of the right exhast tip and it felt like the exhaust was coming out in an even flow but on the left side in had a stutter very much in rhythm with the ticking I saw on the vacume gauge. Do you think that I should do a valve adjustment or should I look at something else. Thanks
Frank. | | |
#20619 01/27/2002 3:12 AM | Joined: Jul 2000 Posts: 504 Member | | Member Joined: Jul 2000 Posts: 504 | It sounds like you could have a loose rocker arm or two. Adjusting the valves is a good place to start..
Bill M
53 GMC Hydra-Matic
Home Page
http://home.comcast.net/~bd97/index.html
When you argue with a fool, two fools are arguing..
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#20620 01/27/2002 3:37 PM | | Anonymous Unregistered | | Anonymous Unregistered | Could possibly be a burnt or sticking valve. You say you did a "tune up"? What did the old plugs look like? | | |
#20621 01/27/2002 4:22 PM | Joined: Jan 2002 Posts: 32 Member | | Member Joined: Jan 2002 Posts: 32 | The plugs were dark gray, not oily , not crusty, all in the same condition. Replaced plugs, points condensor, cap, rotor, set gap and idle adjustment to factory service manual specs. Another thing I have noticed besides the clattering is that before under accelaration my exhaust sounded steady or even, now it has a
uneven stumble to it, more so it seems out of the left side. | | |
#20622 01/27/2002 7:43 PM | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I agree with Don and 53 4 me : first look for a sticking valve and check your valve lash settings. Did you remove the valve cover and slowly rotate the engine, checking the gaps between the rocker arms and intake and exhaust valves?
A few months ago, after letting an engine sit for several months, a few of the exhaust valves stuck open (far enough for lifter push rods to come out of position). I lubricated the valve stems/guides and cleaned the oil lines to the rocker arm shaft.
Tim | | |
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