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Wheel loader YUCHAI YC4102 YC4105 ENGINE ASSEMBLY Crankshaft 1DQ000-1005015A
Key Considerations for Repair and Assembly
1. Bearing Selection: When replacing a crankshaft, you must also install a complete set of new main bearings and connecting rod bearings; never reuse old bearings.
2. Cleanliness: Before assembly, thoroughly flush the internal oil passages of the crankshaft using high-pressure oil or a cleaning agent to ensure that no metal shavings or debris obstruct the flow of lubricating oil.
3. Torque Specifications: When tightening the main bearing cap bolts, use a torque wrench to tighten them in 2–3 stages, working in a crisscross, symmetrical pattern from the center toward the ends. Strictly adhere to the official Yuchai specifications for main bearing bolt tightening torque and angular tightening requirements.
Yuchai 1DQ000 Series Engine (for YC4102/YC4105) Crankshaft Overhaul BOM (Bill of Materials) List.
| Material Category | Part Number (Ref.) | Part Name (EN) | Qty | Overhaul Recommendation | Core Function & Assembly Instructions |
|---|---|---|---|---|---|
| Crankshaft & Support | 1DQ000-1005015A | Crankshaft Assembly | 1 | Mandatory Replacement | The core power output source of the engine (Main part of this BOM). |
| A3000-1005054/055 | Main Bearing Shell (Upper/Lower) | 1 Set | Mandatory Replacement | Supports crankshaft rotation. Never reuse old bearings; apply fresh oil during assembly. | |
| 1DQ000-1005058A | Crankshaft Thrust Washer | 1 Set | Mandatory Replacement | Limits the axial play (end play) of the crankshaft to prevent bearing seizure. | |
| 1DQ000-1005100A | Crankshaft Vibration Damper | 1 | Optional / Condition-Based | Absorbs crankshaft torsional vibration. Replace if rubber is aged or belt grooves are worn. | |
| 1DQ000-1005121 | Crankshaft Timing Gear | 1 | Optional / Condition-Based | Replace if the original gear cannot be non-destructively removed via hot press. | |
| Piston & Connecting Rod | 1DQ000-1004022 | Connecting Rod Bearing (Big-End) | 4 Sets | Mandatory Replacement | Must be replaced when replacing the crankshaft to ensure proper oil film and shock absorption. |
| 1DQ000-1004001A | Piston | 4 | Highly Recommended | Works with the cylinder liner. Typically replaced as a full set with piston rings during an overhaul. | |
| 1DQ000-1004016 | Piston Ring Set (Compression/Oil) | 4 Sets | Highly Recommended | Ensures cylinder sealing; prevents oil burning and blow-by gas leakage. | |
| 1DQ000-1002015 | Cylinder Liner (Sleeve) | 4 | Highly Recommended | Replace if the original liner shows scuffing, scoring, or a noticeable wear ridge. | |
| 1DQ000-1004011 | Piston Pin & Retaining Circlips | 4 Sets | Highly Recommended | Connects the piston to the small end of the connecting rod. | |
| 1DQ000-1004021 | Con-Rod Bushing (Small-End) | 4 | Optional / Condition-Based | Check small-end clearance; press-fit a new bushing and ream if it exceeds standard limits. | |
| Seals & Gaskets | 1DQ000-1003011A | Cylinder Head Gasket | 1 | Mandatory Replacement | Critical high-pressure seal. A one-time-use item that must be replaced once the head is removed. |
| 1DQ000-1005021A | Crankshaft Front Oil Seal | 1 | Mandatory Replacement | Prevents engine oil from leaking out of the front end (near the crankshaft pulley). | |
| 1DQ000-1005031A | Crankshaft Rear Oil Seal | 1 | Mandatory Replacement | Prevents oil from seeping into the flywheel housing/clutch/torque converter (critical swap). | |
| 1DQ000-1009012A | Oil Pan Gasket | 1 | Mandatory Replacement | Must be replaced after dropping the oil pan to access the crankshaft and clean oil sludge. | |
| 1DQ000-1002061 | Timing Gear Case Cover Gasket | 1 | Mandatory Replacement | Must be replaced after removing the front timing gear housing cover. | |
| 1DQ000-1003016 | Valve Cover Gasket | 1 | Mandatory Replacement | Prevents oil leakage from the top valve/rocker arm cover. | |
| Lubrication & Filtration | 1DQ000-1012011 | Engine Oil Filter | 1-2 | Mandatory Replacement | Filters out break-in metallic microparticles. Recommended to swap again after initial test run. |
| 1DQ000-1105010 | Fuel Filter Assembly | 1 Set | Highly Recommended | Standard maintenance part; highly recommended to replace during a full overhaul. | |
| 1DQ000-1011010 | Oil Pump Assembly | 1 | Highly Recommended | Core pressure source. If the old pump provides low pressure, the new crankshaft will seize instantly. | |
| 15W-40 (CH-4/CI-4) | Diesel Engine Oil | ~10-12L | Mandatory Replacement | Fill with fresh oil after thoroughly cleaning the oil pan; use it to coat bearings during assembly. |
DETAILS
| DESCRIPTION | Crankshaft | PART NUMBER | 1DQ000-1005015A |
| WEIGHT | 40kg | VOLUME |
800 × 250 × 250 mm |
| TRUCK MOLDE | YUCHAI | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | ENGINE |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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