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Low RPM Shaking, like out of balance?
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Author:  knuckledown [ Sun Jun 10, 2007 2:08 pm ]
Post subject:  Low RPM Shaking, like out of balance?
Yesterday I replaced the valve cover gasket on my slant and now it seems as if my engine has an "out of balance" shake to it at very low RPM's.

Now, I doubt that something is out of balance, I think I crossed one of the vacuum lines up with a different one. Something isn't right, tho.

Help!
Author:  SlantSixDan [ Sun Jun 10, 2007 2:19 pm ]
Post subject: 
Well, your '71 does have at least two hoses running to the crankcase breather (at the back of the valve cover), one large-diameter line that runs from the PCV valve to the base of the carb, and another large-diameter line that runs from the body of the fuel pump to the top of the carb....
Author:  Greg Ondayko [ Sun Jun 10, 2007 3:54 pm ]
Post subject: 
Did you Take off any of the plug Wires in the process??

I have crossed wires and It gave me the effect you describe.

Greg
Author:  Sam Powell [ Sun Jun 10, 2007 4:25 pm ]
Post subject: 
It sounds like a plug wire is just off at one end or the other. If they are crossed you will very often get a back fire, either through the exhaust or carb. . If a spark plug wire is disconnected, then you get a foomp, foomp foomp sound in the exhaust as well. You could have a plug wire that is grounding out, and firing to ground before the plug can spark.
Sam
Author:  knuckledown [ Sun Jun 10, 2007 5:15 pm ]
Post subject: 
You guys are awesome!! :D

I'll check all of those things out.

This is what I did yesterday:

Drained oil and changed filter. I may have bumped the distributor when changing the oil?

I then pulled the valve cover to change the gasket. What a pain!! The cork material was glued on, as well as covered in RTV sealant. I used a little parabond and a new rubber gasket.

I think I put all the hoses back in the right order. Everything looks good. But I did notice that when I start my car, it idles higher and I have to kickdown the throttle to get it to run at a normal operating rpm.

I'm hoping I can get some help at work tomorrow. We have a couple of former Chrysler tech's on our staff.

Thank you for the help, I will certainly check those things out!
Author:  Doc [ Mon Jun 11, 2007 8:26 am ]
Post subject: 
Did you adjust the valve lash while the valve cover was off?
(you should have at least checked it once the cove was off)
DD
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