How to Disassemble the Yanmar 3TNV series and 4TNV series Engine Cylinder Head: Disassembly, Inspection and Reassembly

 This article describes how to disassemble the Yanmar 3TNV series and 4TNV series engine Cylinder Head: Disassembly, Inspection and Reassembly

 For Yanmar Diesel Engine Agriculture Excavator Tractor Marine Generator Diagnostic tool

 

 09.2024 Yanmar SA-Direct 2.45 Offline Diagnostic Software

  Disassembly procedure:

Disassemble in the order of the numbers shown in the illustration.

1) Remove the alternator assy. (Point1)

2) Remove the fan, pulley and V belt.

    3) Remove the thermostat case. (Point2)

                        4) Remove the fuel filter and fuel oil piping. (Point3) 

5) Remove the oil level gage assy. 

6) Remove the oil filter. (Point4)

            7) Remove the fuel injection pipes. (Point5)

8) Remove the intake manifold assy.

9) Remove the exhaust manifold assy.

10) Remove the rocker arm cover Assy.

                                              11) Remove the rocker shaft assy, push rods and valve caps. (Point6)

                                12) Remove the cylinder head assy and head gasket. (Point7)

                                       13) Remove the fuel injection valves and fuel return pipe. (Point8)

                                             14) Remove the intake/exhaust valves, stem seals and valve springs. (Point9)

15) Remove the rocker arms from the rocker shaft.

2018 Yanmar Engine Diagnostic Service Tool Software

 

How to calibrate the cylinder of Yanmar 3TNV and 4TNV engines

This article describes how to calibrate the cylinders of Yanmar 3TNV and 4TNV engines

 

 

For Yanmar Diesel Engine Agriculture Excavator Tractor Marine Generator Diagnostic tool

1) Slight uneven worn, flawed, etc. shall be

corrected by honing only.    If the cylinder is

unevenly worn partially, flawed or otherwise

damaged and cannot be repaired simply by

honing, rebore the cylinder first and then hone. See 4.4.5.(1)(c) for the boring dimension.

2) Items to be prepared for honing

l Flex-Hone

(see No.8 of 4.1.2 in Chapter 4)

l Electric drill

l Honing fluid

(50:50 mixture of lube oil and diesel oil)

 

 09.2024 Yanmar SA-Direct 2.45 Offline Diagnostic Software

 

3) Apply the honing fluid to the Flex-Hone and turn   the electric drill at 300 to 1200 rpm.    Then insert the Flex-Hone into the cylinder bore while turning it, and move it up and down for about 30 sec. to   obtain a honing mark with a cross hatch angle of

30 to 40 .

[NOTICE]

1) Avoid faster revolution than 1200 rpm since it may cause breakdown.

2) Do not insert or extract the Flex-Hone in    stopped state because the cylinder will be 

                                                                              

2018 Yanmar Engine Diagnostic Service Tool Software

 

Caterpillar 311F LRR EXCAVATOR Troubleshooting of Oil in Coolant

caterpillar 311F LRR EXCAVATOR Oil in Coolant Possible Causes

Caterpillar ET 2024A & 2023C & 2019C Electronic Technician Diagnostic Software Download and Installation 

 • Engine Oil Cooler

 • Cylinder Head Gasket 

• Cylinder Head 

• Cylinder Block

Troubleshooting Test Procedure: 

1. Engine Oil Cooler

A. Drain the coolant from the cooling system. Drain the lubricating oil from the engine oil cooler. Refer to the Operation and Maintenance Manual for more information.

  B. Check the engine oil cooler for leaks. Refer to Systems Operation, Testing and Adjusting, "Cooling System" for the correct procedure. Result and Action: 

A leak was found in the engine oil cooler. Install a new oil cooler. Refer to Disassembly and Assembly, "Engine Oil Cooler - Remove" and Disassembly and Assembly, "Engine Oil Cooler - Install" for the correct procedure. Flush the cooling system. Refer to the Operation and Maintenance Manual for the correct procedure. Refill the cooling system with the appropriate coolant. For recommended coolant and volume,

  2. Cylinder Head Gasket

A. Remove the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Remove". 

 

 B. Inspect the cylinder head gasket for damage and any signs of leaks   

JCB Electronic Service Tool Diagnostic Kit High Quality

Results and Actions:

Result: The cylinder head gasket shows no signs of damage or leaks. 

Install a new cylinder head gasket, then install the cylinder head. Refer to

 Disassembly and Assembly, "Cylinder Head - Install".   

Result: The cylinder head gasket shows signs of damage or leaks.

Go to Test Step 3.  

 3. Cylinder Head

A. Inspect the cylinder head for cracks.

 

Perform a leak test on the cylinder head. Refer to Systems Operation, Testing and Adjusting, "Cylinder Head - Inspect" for the correct procedure.

 CAT Comm Adapter 3 478-0235 Diagnostics for Caterpillar

Result and Actions:

 Damage was found in the cylinder head.

Repair or replace the cylinder head.

  Install the cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Install".

 Result: No damage found in cylinder head.

 

  4. Cylinder Block A. Inspect cylinder block upper surface for signs of wear and leaks. Refer to Systems Operation, Testing, and Adjusting, "Cylinder Block - Inspect" for the proper procedure.

  Result and Action:

: Damage found in cylinder block. Repair or replace cylinder block. Inspect top deck. Refer to Reuse and Reconditioning Guide for the proper inspection procedure. Result: No damage found in cylinder block. Install cylinder head. Refer to Disassembly and Assembly, "Cylinder Head - Install".

     12.2021 Caterpillar ECM ECU Flash Files Full Set Download