Yanmar L4sV L70V L100V Engine Engine

• Poor Spray Pattern from Fuel Injection Nozzle
  Fix: Check and Adjust
• Low Compression
  Cause: Clogged element, Broken element, Defect at element seal portion, Misadjusted, damaged or sticking compression release, Excessive or no clearance, Warped or burned valves, Sticking valve, Gas leak due to worn valve seat, Valve Seat or foreign matter trapped in valve, Excessive end gap or broken piston rings, Damaged, scored, or cracked piston, Excessive wear or scoring cylinder, Bent connecting rod
  Fix: Clean the element, Replace the element, Repair or replace as necessary, Adjust the valve clearance, Replace the intake / exhaust valve, Replace the intake / exhaust valve, Lap the valve seat, Replace piston rings with new, Replace piston with new, Perform honing and use oversized piston and rings, Replace with new
• Insufficient Poor Engine Air Starting Problem
  Cause: Air in Fuel System, Blocked Air Inlet or Passages, Damaged Cooling Fan, Incorrect Engine Oil, Engine Oil System Leakage, Bell Delivery Capacity of Trochoid, Clogged Engine Oil Filter, Insufficient Engine Oil Level, Too Early Timing of Fuel Injection Pump, Too Late Timing of Fuel Injection Pump, Incorrect Diesel Fuel, Water in Fuel System, Clogged Fuel Filter
  Fix: Clean air intake screen, fan blades, Bleed the Air, Clean or Replace, Add Correct Engine Oil, Check and Adjust, Use Correct Fuel Oil, Drain the Fuel Tank, Clean or Replace Outlet Fuel Filter
• Exhaust Color
  Cause: Engine Starts Exhaust During Work Soon. D = fc, Exhaust Smoke Sia] 3 =lo|lF#lé 2, Q;}e]9 ce |/S8/# /E}]2]_ o
• Engine Starts
  Cause: Exhaust During Work Soon. D = fc, Exhaust Smoke Sia] 3 =lo|lF#lé 2, Q;}e]9 ce |/S8/# /E}]2]_ o

Compiled from service & troubleshooting documentation across every generator set that uses the Yanmar L4sV L70V L100V.