Subject: RE: Mystery engine noises
Author: Charlie Mullendore
Date: Aug 15, 2005, 3:36 PM
Post ID: 1719300878
Hi Ed,
Usually most noticable after disassembly are differently color spots on
the main bearing surfaces. The chrome flakes become imbedded in the
bearing material and chew on the crank surface. If I remember correctly,
Guzzi cranks are nitrided and this helps defend against the damage some.
Still, I looked at a pile of parts from the same engine at VMD recently.
The cylinders were missing about 1" of the chrome near the top, specks
of chrome were evident on the main bearings and the crankshaft's bearing
surfaces were scored to the point it would need to be ground.
Edward Walton wrote:
Thanks for your help Rick. I have no play in the rod that i could feel when it was appart. Ajusted valves down to 0.002 inch still had the noise but i did not check the push rods for loose ends, will do it tonight. Does anyone know what your engine parts look like after they are damaged by chrome flakes ?? Ed From: rick rappazo <rapf-@aol.com> |
| Hi Ed ,I have rebuilt many motors,but Iam fairly new to moto guzzi.I have not seen to many upper rod bearing that bad .Taking the wrist pin in and out should have no effect on the upper rod bushing.When you put the pin in the bushing is their any up and down play? I have worked on two moto guzzi motors and each had one push rod with a loose end? something else to think about,,,,,,,,,how about valve guide to valve,should not have much more than .002. tops. |
Charlie
http://www.loopframeguzzi.com/