Do Not Use "V" Mark As Reference To Install Pistons With Keystone-Type Rings{1214,1215}
Usage:
All 1693, D343, D346, D348 And D349 Engines
There have been reports from the field that dealer personnel do not clearly understand the "V" marks on the tops of pistons which have Keystone-type rings.
Do not use the "V" mark as a reference during the installation of pistons which have Keystone-type rings in these engines.
The "V" mark was originally used for correct alignment of valve pockets during the installation of pistons which have rectangular rings. The "V" mark is currently on pistons which have Keystone-type rings, but it has no purpose because the valve pockets are the same size and shape. Also, the location of the "V" mark is not acceptable for any alignment purposes.
Caterpillar Information System:
1981/11/30 New Spacer; New Shaft Assembly Permits Pressure Lubrication Of Sun Gear{3304,3307}
1981/11/30 New Tube And Cover Assembly Make Service Easier{3300,3306}
1981/11/30 New Duo-Cone Seals Use Seal Rings Made Of Steel Instead Of Cast Iron{7555}
1981/11/23 Plate Added To Hold Oil Lines In Adapter For Left Side Oil Filter{1306,1307}
1981/11/23 New Regulator And Field Coil Assemblies Used{1410,1405}
1981/11/23 Use Of Metric Fasteners{7553,0683,1000}
1981/11/23 New 6V4190 Auto Programmer Group And 6V4865 Auto Programmer Connector Used With 6V2100 Multitach{0651}
1981/11/16 Locating Special Instructions Quickly And Easily Using Microfiche{0374}
1981/11/16 New Inlet And Exhaust Valves, Valve Guides Have Tighter Fit To Prevent Corrosion, Guide Wear{1104,1105,1101,1103,1108,1109}
1981/11/16 Improved Element Assemblies Used In Jacket Water Heaters{1383}
1981/11/16 New Shaft Assembly Used In Flexible Coupling Arrangement{3303}
1981/11/16 Check Bottom Surface Of Cylinder Liner Flange For Erosion And Wear{1216,1201}
1981/12/07 New Air Cleaner Group Has Six Clamps For Improved Seal{1051}
1981/12/14 Make Sure Coolant Conditioner Elements Are Changed At Correct Intervals{1350}
1981/12/14 How To Remove The 7L4511 Sleeve Assembly From Aftercoolers{0620,1063}
1981/12/14 New Springs For Timing Advance Used In Governor And Fuel Pump Drive Group{1272,1288}
1981/12/14 New Cylinder Liners And O-Ring Seals Give Longer Seal Life{1216,1201,1213,1227}
1981/12/21 Use Of A Flex-Hone For Cylinder Liner Reconditioning{0664,0674,1216}
1982/01/11 Improvements And Test Procedures For Hydramechanical Shutoffs{7418}
1982/01/11 Check 14 Test Points In Less Than 5 Minutes With The 6V2150 Starting/Charging Analyzer Group{0651,1518,1406}
1982/01/11 Improved Head Gasket Has Larger Fire Ring To Decrease Fretting{1101,1201}
1982/01/11 Procedure Reduces Possibility Of Spraying Hot Hydraulic Oil When S.O.S. Sample Is Taken{0372,5068}
1982/01/11 Use Improved Start Switch In Most Applications{1416}
1982/01/11 "Sirs User Instructions" Available{0374}