New Adjustment Pin And Valve Seal Used In Fuel Ratio Control
Usage:
D343, D346, D348, D349, D353, 1693, 3406, 3408, 3412 Engines
Description of Change: A new adjustment pin and valve seal are now used in fuel ratio control for the above listed models. The new pin is made of a plastic material. The former pin was made of steel and some times gouged (made a hole) and stuck (will not move) in the cap. This caused a change in the engine performance. The new pin will prevent these problems.
The new valve seal is made of a material that has more resistance to becoming hard with age. Some of the former seals became hard and cracked or broke.
Adaptable To: Direct replacement.
Caterpillar Information System:
1977/08/24 Improved Cylinder Block With Spacer Plates Used With Improved Cylinder Heads And Cylinder Head Gaskets
1977/08/24 Problems With Oil Or Fuel Filters
1977/08/24 New Main And Connecting Rod Bearings Are Made Of Higher Strength Material
1977/08/10 New Air Inlet Manifold Has Longer Bolt Bosses With More Thread Depth To Keep Bolts Tight
1977/08/10 Tools To Install Crankshaft Seal And Wear Sleeve
1977/07/13 New Inserts To Repair Cylinder Liner Seats On D353 Engine Blocks
1977/07/13 Clean Bolt Holes In Cylinder Block Before Cylinder Heads Are Installed
1977/07/13 Baffle Added To Water Pump Cover To Send Coolant In Bypass Line Directly Into The Water Pump
1977/07/13 New Seal For Crankshaft
1977/07/13 Use New Procedure To Tighten Flywheel Housing Bolts
1977/07/13 Correct Adjustment Of Fuel Shut-Off Solenoid Shaft Can Prevent Failures
1977/07/13 List Of Service Publications
1977/08/24 More Bolts Hold Flywheel Housing Group
1977/08/24 Improved Coolant Seal For Connection Between Cylinder Heads
1977/08/24 Larger Boss Used In Cylinder Block So Bolt Hole Will Not Be Drilled Into Coolant Passage
1977/08/24 Installation Of Generator Sets On Rigid Bases
1977/08/24 Be Sure To Drain Oil In BrakeSaver At Every Lubricating Oil Change Period
1977/09/07 Installation Procedure For Crankshaft Wear Sleeves Changed
1977/09/07 New Clutch Groups Used In Front Power Take-Offs; Service Kits Available
1977/09/07 Engine Valve Springs Are Now Made Of Stronger Steel
1977/09/07 New Tube Assemblies For Turbocharger Oil Lines; New Base Assemblies For Oil Filters
1977/09/07 Check For Extra Holes In Crankshaft Flange If Oil Leaks From Between The Flywheel And Crankshaft Flange
1977/09/07 List Of Service Publications
1977/09/28 Stronger Fan Drive Pulley Prevents Cracks During Assembly; Torque On Pulley Bolts Changed