Looking for the right replacement part on your 4BG1 engine? This 74-page parts catalog (S/N 51350001-) documents every assembly in the Isuzu BB-4BG1-TRE as fitted to the Takeuchi TB1135C excavator. Thirty-three exploded views break down everything from cylinder head and crankshaft to the full injection pump, including governor, feed pump, and coupling subassemblies. Each bolt, gasket, and seal is listed by OEM part number. Valve seat inserts are spec'd at 47 mm OD (inlet) and 39 mm OD (exhaust), so you can order the correct replacement without pulling the old one to measure. The flywheel section calls out all 6 bolts individually. Bookmarked PDF format means you jump directly to the assembly you need from any device in the shop.
What's Inside This Isuzu BB-4BG1-TRE Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine Gasket Kit | 7-8 | - |
| Cylinder Head | 9-10 | - |
| Cylinder Block | 11-12 | - |
| Oil Pan & Level Gauge | 13-14 | - |
| Camshaft & Valve | 15-16 | - |
| Crankshaft, Piston & Flywheel | 17-18 | - |
| Gear Case & Flywheel Housing | 19-20 | - |
| Manifold | 21-22 | - |
| Ventilation System | 23-24 | - |
| Water Pump | 25-26 | - |
| Thermostat & Housing | 27-28 | - |
| Fan & Fan Belt | 29-30 | - |
| Turbocharger System | 31-34 | - |
| Fuel Injection System | 35-36 | - |
| Fuel Filter & Bracket | 37-38 | - |
| Fuel Pump & Pipe | 39-40 | - |
| Oil Cooler & Oil Filter | 41-42 | - |
| Oil Pump & Oil Strainer | 43-44 | - |
| Oil & Vacuum Piping | 45-46 | - |
| Electrical Control Parts | 47-48 | - |
| Starter | 49-50 | - |
| Generator | 51-52 | - |
| Injection Pump | 53-64 | Governor, Feed Pump, Miscellaneous Parts, Coupling |
| Accelerator Pedal And Control | 65-66 | - |
| Fuel Tank | 67-68 | - |
| Water Sedimenter | 69-70 | - |
| Air Cleaner | 71-72 | - |
| Radiator & Oil Cooler | 73-74 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Inlet Valve Seat Insert Outer Diameter | 47 | p. 10 |
| Exhaust Valve Seat Insert Outer Diameter | 39 | p. 10 |
| Cylinder Head Sealing Cup Outer Diameter | 12.3 | p. 10 |
| Exhaust Manifold Stud Length | 87 | p. 10 |
| Cylinder Block Rear Sealing Cup Outer Diameter | 67 | p. 12 |
| Flywheel Bolt Quantity | 6 | p. 18 |
| Breather Rubber Hose Clip Inner Diameter | 48 | p. 24 |
| Camshaft Rear Bearing Shim Thickness Option 1 | T=0.10 | p. 54 |
| Injection Pump Tappet Shim Thickness Option 1 | T=0.30 | p. 54 |
| Governor Flyweight Sleeve Shim Thickness Option 1 | T=0.20 | p. 57 |
| Starter Through Bolt Quantity | 2 or 4 | p. 50 |
| Coupling Gear Bolt Quantity | 6 | p. 64 |
Isuzu BB-4BG1-TRE Common Problems This Manual Covers
Isuzu BB-4BG1-TRE turbocharger failed, need correct replacement part numbers for complete turbo assembly p. 31
Open the Turbocharger System exploded view on page 31 for the full assembly breakdown. Identify each component by reference number: turbine housing, compressor wheel, and wastegate actuator. The actuator is not listed as a separate part, so plan on sourcing the complete assembly. Cross-reference all part numbers against your engine serial number range before ordering.
Manual Section: Turbocharger SystemCan't identify correct fuel injector part numbers after hard starting and misfires p. 35
Locate the Fuel Injection System parts list on page 35 for injector assemblies and associated seals. Match each injector by reference number in the exploded view. The injection pump section starting on page 53 covers related delivery valves and shim kits; tappet shims start at T=0.30. Order all copper washers and O-rings shown in the diagram whenever replacing injectors.
Manual Section: Fuel Injection SystemNeed to find correct fuel filter, lift pump, and fuel line part numbers for fuel starvation issues p. 37
Start with the Fuel Filter & Bracket exploded view on page 37 for filter elements, bracket hardware, and sealing rings. For the lift pump and supply lines, turn to the Fuel Pump & Pipe section on page 39. The water sedimenter on page 69 is often missed; include its drain valve and gasket in your parts order. Replace all rubber fuel lines at the same time.
Manual Section: Fuel Filter & BracketStarter cranks slowly or clicks, need part numbers for starter motor and mounting hardware p. 49
Pull up the Starter exploded view on page 49 for the motor assembly, solenoid, drive gear, and brush holder. Page 50 lists two types of through bolts; verify the correct part number and quantity (either 2 or 4) for your starter variant. Review Electrical Control Parts on page 47 for relay and wiring harness part numbers affecting the starter circuit. Confirm flywheel ring gear condition in the Crankshaft, Piston & Flywheel section on page 17.
Manual Section: StarterLooking up glow plug and electrical control part numbers for cold weather no-start condition p. 47
Refer to the Electrical Control Parts exploded view on page 47 for glow plug assemblies, glow plug relay, and wiring connectors. Each glow plug threads into the cylinder head; confirm compatibility using the Cylinder Head parts list on page 9, where the inlet valve seat insert measures 47 mm OD for orientation reference. Order the full glow plug set rather than singles for even heat across all cylinders.
Manual Section: Electrical Control PartsNeed correct gasket kit and cylinder head part numbers after overheating damage p. 7
Turn to the Engine Gasket Kit exploded view on page 7 for the full overhaul set: head gasket, valve stem seals, and manifold gaskets. Cross-reference with the Cylinder Head section on page 9 for individual components like valve seat inserts (inlet: 47 mm OD, exhaust: 39 mm OD) and sealing cups (12.3 mm OD). Verify each part number matches your serial number range before placing the order.
Manual Section: Engine Gasket KitFrequently Asked Questions
What are the replacement specifications for Fuel injectors?
The complete fuel injector assembly (Nozzle ASM: INJ) is part number 1897222-1700. The individual nozzle component (Nozzle: INJ) is 1115311-3010. Four of each are required per engine.
Is this Isuzu BB-4BG1-TRE Parts Catalog a digital download?
Yes. It's a 74-page searchable PDF, available immediately after checkout. Works on computer, tablet, or phone with no shipping wait.
Are there any print restrictions on this Isuzu BB-4BG1-TRE manual?
No restrictions. The PDF is DRM-free, so you can print any section for the shop. Standard letter or A4 paper works fine.
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