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Re: type3-d Digest V2005 #54

On 27 Jan 2005 at 22:29, Fiesta Cranberry wrote:

> >I would expect more than this from a '71 
> >engine, but this sounds pretty awful. It 
> >makes me wonder if it might actually be 
> >some other kind of problem, 

> That's why I wrote in, it just seems the car wouldn't have lasted this long
> with that kind of a problem.  You know, to me, it sounds like the noise is
> coming from the area of the generator, not within the engine itself.  And it
> sounds more like a rattle than a knock, like something in the
> generator/pulley/fan area is loose.  It's been doing this quite a while, and
> I seem to remember it starting after I got rear-ended (about 2 years ago) and
> somethng broke off the fan area and ended up in the big rubber boot.  A
> circular flat piece of metal about 3" across with a 1" hole in the middle. 

It COULD be a loose pulley. Have Lloyd check that, or you can just reach down a 
grab it and try to shake it.

What did your 3" piece of metal look like? Aluminum or steel? Metallic colored 
or painted (black or car colored?) Do you have a photo?

Use a long screwdriver to listen for it. Push the blunt end in one ear and 
place the metal end on various parts of the engine while its idling and making 
that noise. Rod bearing noise will be strongest when you listen right on the 
case. You can listen there, and on the generator, the fan housing and the 
heads. You'll note that you can hear different kinds of noise at each location.

> >Could it be a loose head? 
> What is a  "head"?

Cylinder head. These are the things at the outer ends of each cylinder. They ar 
the parts that the spark plugs screw into. There are 2 heads, L & R, one for 
each pair of cylinders.

The cylinders are captured between the heads and the engine case, and the 
clamping force is provided by 8 long studs on each side. These studs can simply 
come loose, or the threads in the soft metal case can strip out leaving the 
studs loose. Once the studs are loose, the heads tend to bounce on top of the 
cylinders and make a lot of noise.

> >Or maybe one of the oil pressure relief valves is stuck....
> How could I tell?  

If the oil pressure always seems to be too low. This is ONE of the possible 

> Lloyd says I should buy a pressure gauge---that it will show if the oil
> pressure is too low, and that means it needs to be rebuilt.  So, if the
> pressure is OK, does that mean it's not the rods/bearings?  Is there a
> certain size of gauge I need to get, or are they all the same?

Any gauge that measures up to 50 psi would be fine. You don't have to install 
it permanently, just hook it up temp and watch it a bit as the engine warms up.

If you never seem to get decent pressure, then it is fairly easy to pull the 
pressure relief valves out just to check that they are free and not stuck. 
Lloyd can help with this.

Jim Adney
Madison, WI 53711-3054

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