<VV> Engine noise diagnosis on full rebuild

[BobHelt at aol.com]

Hi (wish that you had told us your name, it helps)
Please see comments below.
Regards,
Bob Helt
 
In a message dated 11/14/2008 9:03:03 PM US Mountain Standard Time,  
tirediron at charter.net writes:

a 1964  convertible, late 110 engine rebuilt 140 heads.

Rebuild included new  crank, 
new crank? What does new mean?   NOS or reground?????  If  reground, by how 
much?
 
 

Isky  cam, lifters, valve train, bearings and
fasteners. It ran fine then at  about 490 miles developed what sounded like a
collapsed lifter. The owner  found that the noise  diminished at higher rpm.
So he abused it and  the clatter morphed into a knock. Initially a lifter was
replaced and  showed excessive wear. 
OK, but a worn lifter (I assume worn on the base, right?) should have told  
you right then and there that the cam lobe was shot too.
 
 

Complete  tear down found a bad crank and
resultant (?) loose main.  
I'm confused. Loose main??? do you mean to say that the main was loose to  
start with? Were all clearances Plastigaged during the rebuild?  Or are you  
saying that the main bearing was worn excessively so as to increase the  
clearance? How much wear was on the crank?  Is it possible that the  incorrect bearing 
was installed during the rebuild?
 
 

Consultation with Clark, tech led to the
conclusion that the crank  from another vendor was at fault.  
Please explain how this was determined.
 
 

New  crank
obtained from Clark¹s. 
What does new mean?
 
 
What about the cam and lifters being at fault too? Since a lifter was worn,  
what breakin procedure was used to run in the cam and lifters? Did you then  
replace the cam on the second rebuild? You skipped right over the cam and  
lifters for the second rebuild.
 

All  bearings replaced again. Mains, and rods
plastigaged and everything  carefully measured during assembly. Oil passages
carefully  cleaned.   The oil pressure relief valves seemed operative but  one
was replaced to be safe. Cam was ³run in² again. Engine ran good,  oil
pressure 25# at idle 40# at operating speed. Engine has a metallic  sounding
tinny noise isolated with a stethoscope to only one bank of engine  but not
identifiable to a specific cylinder.  Engine seems to run  great.
 
 







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