Description

Kubota D1105B, V1150B 1991 Workshop Manual

Any mechanic who has chased down a fuel leak on a Kubota D1105B without the factory firing order knows the feeling. You waste half a morning guessing at injection timing, then find out the aftermarket book had the wrong advance angle. This Kubota D1105B, V1150B 1991 Workshop Manual stops that. Straight from Kubota Corporation, 187 pages of specs that match what left the factory in ’89 through ’91.

7 Systems Covered

Each section in the Mechanism part breaks down construction and function before you touch a wrench. Engine body, lubricating system, cooling system, intake/exhaust system, fuel system, electrical system. The V1150B shares the same 78.4mm stroke architecture, so the same tolerances apply. Page 1 states this manual covers both models under that stroke family. The specs for ring end gap and main bearing clearance live in the Disassembling and Servicing section under each system. Mechanical fuel injection on the D1105B uses a Bosch-type pump – the lube oil pump clearances are listed after the engine body specs.

Engine Body Disassembly: What You Need to Know

Before pulling the cylinder head, read the General precautions at the start of Disassembling and Servicing. The manual lists required tools – you need a torque wrench that reads in ft-lbs for the head bolts. No guesswork: the factory sequence and torque values are in the Engine Body chapter. Aftermarket reprints often skip the run-in procedure for new bearings. This one includes the seat-in limits for the crankshaft main journals. If you are rebuilding a V1150B that overheated, check the cylinder head warpage limit straight from the OEM table.

Get the Right Torque Data – Why Factory Specs Matter

That aftermarket CD you bought last year? It had the cooling fan bolt torque wrong. I have seen that cause a fan to walk off the hub at 2500 rpm – not something you forget. This manual comes direct from Kubota’s 1991 release. The torque values for the cylinder head, connecting rod nuts, and flywheel bolts were verified on the assembly line. Page 2 carries the part number 97897-00881, which matches the official Kubota document control. If you need information on the transmission that bolts behind this engine, grab a separate resource on Manual Transmission – this manual stays on the engine only.

Does This Manual Cover the Fuel System?

Yes. The Fuel System section under Mechanism explains the injection pump, governor, and injector nozzle operation. Then under Disassembling and Servicing you get the checking procedures for injection timing and nozzle opening pressure. For the D1105B, the fuel return line routing differs from the V1150B because of the block design. The manual spells out which shims to use where. After purging air from the system, the test bench specs for the injection pump appear in the same chapter. No need to cross-reference multiple sources.

Cooling System: Factory Procedures for Overheating

Thermostat opening temperature, water pump clearance, fan belt deflection – all in the Cooling System chapter. The manual tells you to check the radiator cap pressure with a tester, not just eyeball it. If the V1150B runs hot after a rebuild, the first thing to verify is the coolant flow direction. The diagrams in the original print show the hose routing clear and correct. Aftermarket scans lose the line weights and arrows – here you get the full resolution pages. The 1991 edition uses the same cooling layout as later production runs, so it matches engines built through the mid-90s.

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If you are rebuilding the drivetrain separate from the engine, a dedicated guide on Manual Transmission”>Manual Transmission will fill in the gaps this engine manual leaves open.

Frequently Asked Questions

Does this manual include wiring diagrams for the electrical system?

Yes. The Electrical System section covers the starter, alternator, and glow plug circuits. The wiring diagrams show the harness routing for both the D1105B and V1150B configurations.

What years does this apply to?

1991 release but covers engines built from the late 1980s into the early 90s with the 78.4mm stroke.

Can I use this manual for the D1105B with a different injection pump?

The manual covers the standard Bosch-type pump. If your engine has a non-OEM replacement pump, the injection timing procedures still apply, but the nozzle opening pressures may differ. Verify against the pump manufacturer’s data.

Is the torque spec table in inch-pounds or foot-pounds?

Foot-pounds. All fastener torque values are listed in ft-lbs as per North American factory practice. No conversion needed.

Stop wasting time on aftermarket copies that drop critical steps. Get the Access the Factory Manual and have the exact specs Kubota wrote for these engines. Every torque value, every clearance limit, every bleed procedure – printed the way the factory intended.