From: Jeff Clark
Sent: Wednesday, November 10, 2004 12:58 PM
To: Bill Larch (E-mail); Bob Campbell (E-mail); Cathy Devlin (E-mail);
Greg Shank (E-mail); Jeff Clark (E-mail); Jim Gutzwiller (E-mail); Jim
Matasic (E-mail); Jim Moritz (E-mail); Jim Wells (E-mail); Ken Goshorn
(E-mail); Mark Cooper (E-mail); Michael Minotti (E-mail); Pat Fetterman
(E-mail); Riccardo Conti (E-mail); Ron Buck (E-mail); Scott Richards
(E-mail); Steve Kennedy (E-mail); Wim Van Dam (E-mail)
Subject: Recommendation from CRC Diesel Rating Group

Below is the recommended method for rating dark coated pistons.

Regards,

Jeff Clark
Staff Engineer
ASTM Test Monitoring Center
6555 Penn Avenue
Pittsburgh, PA 15206
412-365-1032
412-848-8843 (cell)
jac@astmtmc.cmu.edu


> Recommendation from CRC Diesel Rating Group
> 
> Dark Coated Piston Deposit Evaluation Method
> 
> 1.	Use CRC Manual 20 method modified as follows:
> 		a.	Carbon levels - 
> 			1st groove - HC,MC,LC and estimated fill volume
> percent (TGF)
> 			2nd groove - HC and LC and estimated fill volume
> percent (2nd GF)
> 
> 			1st land (crown) - HC and LC
> 			2nd land - HC and LC
> 
> 			Undercrown - LC only
> 			Oil coolant gallery - LC only
> 		
> 		b.	Varnish/lacquer deposits cannot be evaluated
> reliably because of the interference of the dark coating.
> 
> 2.	Report items:
> 
> 	1st groove deposits and TGF
> 	2nd groove deposits and 2nd GF
> 	1st land (crown) carbon deposits, TLHC and TLFC
> 	2nd land carbon deposits
> 	Undercrown carbon deposits
> 	Oil coolant gallery carbon deposits
> 	Total unweighted carbon demerits (TUCD)