Failure Diagnostic List - Yanmar 3TNV82A Troubleshooting Manual

Failure Diagnostic List

TNV DI Service Manual
Failure Diagnostic List
Defective start
Symptoms and conditions of failures
Starter not Starter
rotate rotates
Cause
Intake/exhaust valve clearance
incorrect
Compression failure at valve seat
Intake/exhaust valve seizure
Cylinder head gasket blow-out
Piston ring sticking or breakage
Wear of piston ring, piston or cylinder
Seizure of crank pin metal or bearing parts
Closed gap position fault of piston ring
Reverse assembling of piston ring
Wear of crank pin metal and journal
metal
Connecting rod bolt loose
Foreign material entered into
combustion chamber
Gear backlash too big
Wear of intake/exhaust valve guide
Governor misalignment
Open/close timing failure of
intake/exhaust valve
Engine vibration isolating support
loose, damage
TNV DI Service Manual
Engine stall Insufficient
Defective rotation control Noise/vibration
after start engine output
Exhaust
Without load At work Exhaust color
fume
FAILURE DIAGNOSTIC LIST
Cooling
Lubricant Intake Exhaust Fuel
water
At work
FAILURE DIAGNOSTIC LIST
Electrics/electronics
Action
Valve clearance adjustment See "Measuring and Adjusting Valve
Clearance" (on page 6-66)
Valve seat facing See "Valve Face and Valve Seat" (on
page 6-43) for 2-valve head, and "Valve
Face and Valve Seat" (on page 6-59) for
4-valve head.
Correction or replacement of See "Removal of Intake / Exhaust Valves"
intake/exhaust valve (on page 6-39).
Gasket replacement See "Removal of Cylinder Head" (on
page 6-54).
Piston ring replacement See "Reassembly of Pistons" (on page 6-
89).
Horning work and usage of over-sized See "Honing and Boring" (on page 6-88).
parts
Repair or replacement See "Inspection of Crankshaft" (on page
6-86).
Correction of closed gap position See "Reassembly of Pistons" (on page 6-
89).
Correction of assembling See "Reassembly of Pistons" (on page 6-
89).
Measurement and replacement See "Inspection of Crankshaft" (on page
6-86).
Tightening at specified torque See"Torque for Bolts and Nuts" (on page
6-25).
Disassembling and repair See "Disassembly of Engine" (on page 6-
72).
Gear mesh adjustment See "Checking Timing Gear Backlash"
(on page 6-73).
Measurement and replacement See "Inspection of Valve Guides" (on
page 6-41).
Adjustment See "Check and Adjust the Governor
Lever and Engine Speed Control (This
does not apply to the following
electronically controlled engines:
4TNV84T-Z, 4TNV98-E, Z, and
4TNV98T-Z.)" (on page 5-30).
Valve clearance adjustment See "Measuring and Adjusting Valve
Clearance" (on page 6-66).
Repair or replacement of faulty parts
Referenced page number
1-223