Re: engine vibration 232 engine

[Scott Frost <Huck@xxxxxxxxxxx>]

If the manifold does not cure the vibration, check your drivelines for 
small imbalances, the raised platform that some tire shops use to 
elevate the cars will sometimes contact with a driveline when lifting 
and tweak it just enough.
Good luck.
Frosty

Jay wrote:

> I already replaced the U-Joints when I  replaced the tranny mount. I 
> already thought about the rear wheel brgs, but havenj't done anything 
> with them yet. I have brand new tires (last week) and it had the 
> vibration before I had the tires changed.  I guess the next thing to 
> do is remove the manifolds, put on a new gasket and i have a new 
> exhaust manifold to replace the old one(its getting noisy,thin walls, 
> I think).
> Have you a copy of the service bulletin you could email me a copy of?
>
> Jay
> ----- Original Message ----- From: "Matt Haas" <mhaas@xxxxxxx>
> To: <mail@xxxxxxxxxxxx>
> Sent: Sunday, November 07, 2004 2:41 PM
> Subject: Re: engine vibration 232 engine
>
>
> > Jay,
> >
> > I just found out that there was a service bulletin issued in 1969 
> > about rough idle and/or surging on six cylinders. The fix was new 
> > intake manifold gaskets and a specific intake torque sequence. The 
> > bad part about this fix is that you need to separate the intake and 
> > exhaust manifolds and there's a good chance that one of those studs 
> > or bolts will break.
> >
> > The torque sequence starts with the top left bolt behind the 
> > carburetor and works clockwise outward. After that, it calls for 
> > tightening the nuts on the intake to exhaust manifold studs (left 
> > first, then right) between the carburetor and motor and then the 
> > outer manifold bolts (the ones that are on the bottom) in the same 
> > order.
> >
> > The vibration could be a bunch of things. Once you fix the wheel 
> > bearings, try over-inflating the tires (add bout 10 psi) and see if 
> > it changes or goes away. You could also have any of the following out 
> > of balance or damaged: wheels and tires, drums, driveshaft. Also, 
> > worn out u-joints or rear wheel bearings can cause vibration.
> >
> > Matt
> >
> > At 11:35 AM 11/7/2004 -0500, you wrote:
> >
> > > I finally got around to tightening the intake and exhaust manifolds 
> > > to 25 ft/lbs and it did help the vibration problem but not 
> > > entirely.  I also have a synchronous vibration while driving at 
> > > about 35 mph. If I let up on the gas it diminishes slightly . There 
> > > is a  "flex" fan on the engine, seems to be in good condition and 
> > > the water pump has no play in the shaft. I would like to find a 5 
> > > blade OEM  fan as i don't like flex fans much. The problem with that 
> > > is it is a small fan because of hose clearance problems. You have an 
> > > American, so you know what I mean. The  35 mph bibration may be a 
> > > wheel bearing going bad. When I got the car back in April, I was 
> > > checking things over and found the LF wheel was NOT tightened down 
> > > properly at the wheel shaft nut. I tightened the nut about a 1/4 
> > > turn until I had no play in the wheel when held at the top and 
> > > bottom.  I have no idea how many miles the bearing was loose and 
> > > driven that way. I am going to replace the bearings on the front 
> > > wheels just to be safe.    BTW, I had a simliar  35 mph vibration on 
> > > my 66 AMBO and I never did find out what caused it. the only thing i 
> > > didn' t replace on it was the engine mounts. I have replaced the 
> > > tranny mount on the American.
> > >
> > > Jay
> > > ----- Original Message ----- From: "Matt Haas" <mhaas@xxxxxxx>
> > > To: <mail@xxxxxxxxxxxx>
> > > Sent: Monday, November 01, 2004 8:54 PM
> > > Subject: Re: engine vibration 232 engine
> > >
> > >
> > > > Jay,
> > > >
> > > > Check the intake manifold bolts. My American did that and 
> > > > tightening the bolts solved the problem.
> > > >
> > > > Matt
> > > >
> > > > At 06:12 PM 10/31/2004 -0500, you wrote:
> > > >
> > > > > Hey Guys, i have a 66 American with the 232/2bbl engine. I have 
> > > > > set the timing, set the idle speed at 700 rpm in neutral/ 550 in 
> > > > > drive. The engine has new plugs and points, doesn't appear to have 
> > > > > any vacuum leaks.  At the 550 rpm speed the engine has a rapid 
> > > > > vibration which is quite annoying. The vibration mostly stops when 
> > > > > i speed the engine up above the idle.  I have replaced the tranny 
> > > > > mount which was dissolved from tranny fluid getting on it before i 
> > > > > got the car. Could the engine mounts be so old and stiff that they 
> > > > > won't absorb even the slightest vibration and transmit it to the 
> > > > > frame? I had a 65 American with a 232/2bbl when it was new in 65 
> > > > > and i don;t remember it being anything but smooth idling. The 
> > > > > engine runs smoothly as far a vacuum gauge shows, no fluctuations 
> > > > > due to worn valves or rings. The engine doesn't smoke and has 120k 
> > > > > miles on the odometer. Someone did put the oil kit from the side 
> > > > > of the block up into the valve cover as suggested in a service 
> > > > > bulletin. I know that has nothing to do with the idle. Just 
> > > > > mentioning it as I hadn't seen this done to many 232 engines.  I 
> > > > > didn;t mention it but the engine has new plug wires also. Any ideas?
> > > > >
> > > > > Jay in Central FL.
> > > >
> > > > mhaas@xxxxxxx
> > > > Cincinnati, OH
> > > > http://www.mattsoldcars.com
> > > > 1966 Rambler Rebel
> > > > 1968 Rambler American sedan
> > > > ===============================================================
> > > > According to a February survey of Internet holdouts released by
> > > > UCLA's Center for Communication Policy, people cite
> > > > not having a computer as the No. 1 reason they won't go online.
> >
> > mhaas@xxxxxxx
> > Cincinnati, OH
> > http://www.mattsoldcars.com
> > 1966 Rambler Rebel
> > 1968 Rambler American sedan
> > ===============================================================
> > According to a February survey of Internet holdouts released by
> > UCLA's Center for Communication Policy, people cite
> > not having a computer as the No. 1 reason they won't go online.

>