[Mg-mmm] PA Engine Noise

[Lew Palmer]

I still think it's a vertical drive alignment issue. First, take the
camshaft off and rotate the engine on the starter (ignition off) and see
whether the dynamo armature and vertical drive rotate and run true with no
binding. If that is OK, check for trueness in the camshaft and that the cam
bearings look OK. Also, lever each valve down and up several times to ensure
they return with no binding.

That all should give you a pretty good idea where the binding is occurring.
The "coffee grinder" sounds are most commonly associated with an imperfect
mesh of the bevel gears. That is solved with shimming up the dynamo to
increase backlash or removal to reduce. If there are no shims under the
dynamo, then the crank mounted bevel gear needs to be shimmed forward.
Occasionally you may be able to shim up the dynamo mounted bevel gear on the
armature shaft.

Report your findings.

Cheers,
Lew Palmer
-----Original Message-----
From: mg-mmm-bounces at autox.team.net [mailto:mg-mmm-bounces at autox.team.net]
On Behalf Of Daniel Shockey
Sent: Tuesday, April 20, 2010 2:13 PM
To: MMM List
Subject: [Mg-mmm] PA Engine Noise

Hello,

I rebuilt my PA engine about 2000 miles ago. After driving it to the GoF
Central in Auburn, IN, in 2008, it started making more noise from the
engine.
As it got louder, it began to sound like a "worn-out coffee grinder," with
noise from the front of the engine. Lew said that means an alignment issue
with the generator/camshaft drive. I haven't driven it since the GoF except
a
little around town. Now it sounds more like a knock inside the valve cover.
It
doesn't seem to run any worse and starts easily.

When I rotate the engine using the hand crank, I get binding at one spot in
the camshaft rotation (every 2nd crankshaft rotation). The flex drive stops
then jumps as I slowly rotate the hand crank. It worked very smoothly when I
first rebuilt the motor. I checked that carefully before starting it.

Do I have an alignment issue with the generator drive or perhaps some
binding
in the camshaft or camshaft drive? Why would it have gotten worse since I
rebuilt the engine?

Any ideas or suggestions on other tests before I start dismantling things? I
need to have it running well for the GoF in Ohio on July 1.

Thanks in advance.

Dan Shockey
Wyoming, Illinois
PA2108


_________________________________________________________________
Hotmail is redefining busy with tools for the New Busy. Get more from your
inbox.
http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:W
L
:en-US:WM_HMP:042010_2
_______________________________________________

Mg-mmm at autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation  $11.47
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
Unsubscribe/Manage:
http://autox.team.net/mailman/options/mg-mmm/lpalmer@roundaboutmanor.com