Diesel Engine parts and their functions

28 top-level parts · 816 parts in total · full bill of materials below

#	Part	Qty	What it does
1	Engine Block	1×	Cast iron cylinder block.
2	Piston	6×	Forged aluminum piston with rings.
3	Crankshaft	1×	Forged steel crankshaft.
4	Turbocharger 3 parts	1×	Variable-geometry exhaust turbocharger.
5	Fuel Injector	6×	Common-rail piezo injector.
6	Aftertreatment Module 2 parts	1×	DPF/SCR
7	Oil Pump	1×	Gerotor engine oil pump.
8	Piston Ring	18×	Compression or oil-control ring, three per piston.
9	Connecting Rod	6×	Forged steel rod linking a piston to the crankshaft.
10	Bearing Shell	26×	Half-shell plain bearing for a main or big-end journal.
11	Poppet Valve	24×	Intake or exhaust valve, four per cylinder.
12	Valve Spring	24×	Coil spring closing a valve.
13	Valve Train Component	24×	Rocker, pushrod or bridge, retainer and collets, guide and seat for one valve.
14	Cylinder Head	1×	Cast iron head with ports, injector bores and coolant passages.
15	Camshaft	1×	Overhead or in-block camshaft with injector and valve lobes.
16	Cylinder Liner	6×	Replaceable wet liner in the block.
17	Flywheel & Housing	1×	Flywheel with ring gear and the housing that mounts the transmission.
18	High-Pressure Fuel Pump & Rail	1×	Common-rail pump and rail feeding the six injectors at up to 2,500 bar.
19	Charge Air Cooler	1×	Air-to-air intercooler between turbocharger and intake.
20	DEF Tank & Dosing Module	1×	Urea solution tank with pump and dosing injector for the SCR catalyst.
21	Exhaust Pipe & Clamp	5×	Stainless exhaust pipe sections, flex joint, clamps and hangers.
22	Fuel Tank	1×	Aluminium or steel diesel tank, 200 to 300 litres.
23	Fuel Line	6×	Supply and return fuel lines with filters and quick connectors.
24	Engine Sensor	22×	Speed, position, pressure, temperature, NOx and soot sensors on the engine and aftertreatment.
25	Engine Gasket & Seal	40×	Head, cover, manifold, pump and pan gaskets and seals.
26	Engine Bolt & Stud	520×	Fasteners for the engine assembly.
27	Connector	60×	engine harness
28	Oil Seal	6×	Spring-loaded rotary lip seal that keeps lubricant inside a housing and dirt out where a shaft passes through, sized to DIN 3760.

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Bill of materials for Diesel Engine

28 top-level lines · 33 rows shown · 816 parts total · indented to 3 levels

#	Item / sub-assembly	Part no.	Qty/assy	Ext. qty	Parts	Type
1	Engine Block	city-bus-engine-block	1×	1	·	part
2	Piston	city-bus-piston	6×	6	·	part
3	Crankshaft	city-bus-crankshaft	1×	1	·	part
4	Turbocharger 3 parts	city-bus-turbocharger	1×	1	5	assembly
4.1	Turbo Housing	city-bus-turbo-housing	1×	1	·	part
4.2	Ball Bearing	ball-bearing	2×	2	·	part
4.3	Oil Seal	oil-seal	2×	2	·	part
5	Fuel Injector	city-bus-fuel-injector	6×	6	·	part
6	Aftertreatment Module 2 parts	city-bus-aftertreatment	1×	1	2	assembly
6.1	Diesel Particulate Filter	city-bus-dpf	1×	1	·	part
6.2	SCR Catalyst	city-bus-scr-catalyst	1×	1	·	part
7	Oil Pump	city-bus-oil-pump	1×	1	·	part
8	Piston Ring	city-bus-piston-ring	18×	18	·	part
9	Connecting Rod	city-bus-connecting-rod	6×	6	·	part
10	Bearing Shell	city-bus-bearing-shell	26×	26	·	part
11	Poppet Valve	city-bus-valve	24×	24	·	part
12	Valve Spring	city-bus-valve-spring	24×	24	·	part
13	Valve Train Component	city-bus-valve-train	24×	24	·	part
14	Cylinder Head	city-bus-cylinder-head	1×	1	·	part
15	Camshaft	city-bus-camshaft	1×	1	·	part
16	Cylinder Liner	city-bus-cylinder-liner	6×	6	·	part
17	Flywheel & Housing	city-bus-flywheel	1×	1	·	part
18	High-Pressure Fuel Pump & Rail	city-bus-high-pressure-pump	1×	1	·	part
19	Charge Air Cooler	city-bus-intercooler	1×	1	·	part
20	DEF Tank & Dosing Module	city-bus-def-tank	1×	1	·	part
21	Exhaust Pipe & Clamp	city-bus-exhaust-pipe	5×	5	·	part
22	Fuel Tank	city-bus-fuel-tank	1×	1	·	part
23	Fuel Line	city-bus-fuel-line	6×	6	·	part
24	Engine Sensor	city-bus-engine-sensor	22×	22	·	part
25	Engine Gasket & Seal	city-bus-engine-gasket	40×	40	·	part
26	Engine Bolt & Stud	city-bus-engine-bolt	520×	520	·	part
27	Connector	connector	60×	60	·	part
28	Oil Seal	oil-seal	6×	6	·	part

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Where the diesel engine is used

1 product across 1 domain contain it, directly or inside a sub-assembly

• Rail & Transit 1 City Bus

Used in 1 assembly

City Bus

Sourcing: possible vendors

Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $500–$50k. How estimates work

Vendor	HQ	Specialty	MOQ	Lead time
🇨🇳Weichai Power weichai.com ↗	Weifang, CN	Diesel & power engines	50 units	12–16 wks
🇮🇳Cummins India cumminsindia.com ↗	Pune, IN	Diesel engines	50 units	12–16 wks
🇨🇳Yuchai yuchai.com ↗	Yulin, CN	Diesel engines	50 units	12–16 wks
🇮🇳Kirloskar Oil Engines koel.co.in ↗	Pune, IN	Diesel & gas engines	50 units	12–16 wks
🇮🇳Ashok Leyland ashokleyland.com ↗	Chennai, IN	Engines & commercial vehicles	50 units	12–16 wks