Product Features

• Structure: A multi-layer composite seal, typically consisting of a metal outer ring, a PTFE sealing lip, and a dust-proof lip. The metal ring is threaded for secure installation, while the PTFE lip provides high wear resistance and low friction.

• Performance: Effectively seals the gap between the crankshaft and timing gear cover, preventing engine oil leakage and blocking external dust and debris from entering the crankcase. It maintains a reliable seal under high rotational speeds and temperature fluctuations.

• Design: Directly interchangeable with the original equipment seal, ensuring a precise fit and proper sealing with the crankshaft and timing gear cover.

Core Function

1. Oil Leak Prevention: Seals the front end of the crankshaft to stop engine oil from leaking out of the crankcase.

2. Contamination Protection: Blocks external dirt, sand, and water from entering the engine, protecting internal components from wear and corrosion.

3. Durability: The PTFE material ensures long service life even under harsh operating conditions, reducing maintenance frequency.

Crankshaft Front Oil Seal D02B-104-02A+B Shangchai – Premium Quality Replacement

When your Shangchai engine starts weeping oil from the front crankshaft area, every hour of downtime costs you money. The Crankshaft Front Oil Seal D02B-104-02A+B from METTLEAD Truck Parts delivers a factory-precise seal that keeps lubricant where it belongs and contaminants out. Engineered to meet OEM dimensional tolerances and material specifications, this seal restores your engine’s sealing integrity and protects critical timing-side components from premature wear.

As a direct-from-factory supplier with over a decade of experience serving global fleet operators and distributors, METTLEAD ensures you receive a seal that performs identically to the original — at a significantly more competitive price point.

Key Features and Benefits

Precision-Engineered Sealing Performance

This crankshaft front oil seal is manufactured using high-grade fluororubber (FKM) lip material bonded to a rigid steel casing. The FKM compound resists thermal degradation at sustained temperatures up to 200°C, ensuring the seal lip maintains consistent radial force against the crankshaft journal — even after thousands of hours of operation.

• Dust lip design — A secondary lip prevents abrasive particles from reaching the primary sealing edge, extending service life in harsh operating environments.
• Spring-loaded lip — A garter spring maintains optimal contact pressure as the lip wears, compensating for minor shaft runout and surface imperfections.
• Corrosion-resistant outer case — The pressed-steel shell features anti-corrosion treatment to prevent bore fretting and ensure a secure interference fit in the timing cover housing.
• OEM-matched dimensions — Manufactured to the exact inner diameter, outer diameter, and width specified by Shangchai for part number D02B-104-02A+B, guaranteeing drop-in installation with no modifications.
• Reduced oil consumption — A properly seated front seal eliminates external leakage paths, keeping oil levels stable between service intervals and protecting the serpentine belt and accessories from oil contamination.

Why Procurement Managers Choose This Seal

1. Cost efficiency — Factory-direct pricing removes distributor markups, reducing your per-unit cost by up to 30–40% compared to aftermarket alternatives sourced through intermediaries.
2. Consistent supply — Batch production capability means we hold stock for fast dispatch, minimizing your fleet downtime.
3. Verified compatibility — Each seal is cross-referenced against Shangchai’s original part specifications to eliminate fitment risk.
4. Bulk packaging options — Available in white-label or custom-branded packaging to support your own distribution network.

Technical Specifications

Application Scenarios

Compatible Engine Models

The D02B-104-02A+B crankshaft front oil seal is designed for Shangchai SC series diesel engines commonly found in the following heavy-duty applications:

• Shangchai SC9D/SC8D series — Widely installed in SANY, XCMG, and Zoomlion construction machinery including wheel loaders, excavators, and motor graders.
• Shangchai C6121 series — Powers Caterpillar-licensed engines used in SEM and Shantui bulldozers and pavers.
• Shangchai D6114/D9 series — Found in FOTON AUMAN, DONGFENG, and various medium-to-heavy-duty trucks operating across Africa, Southeast Asia, and the Middle East.
• Generator sets and marine auxiliary engines — Shangchai-powered gensets in the 100–400 kW range rely on this seal for continuous-duty reliability.

Whether your fleet operates in the scorching heat of a West African mining site or the freezing conditions of a Central Asian highway, this seal’s FKM compound maintains its elasticity and sealing force across the full operating temperature spectrum.

OEM/ODM Capability

METTLEAD Truck Parts operates its own quality-controlled production lines, giving you flexibility that generic trading companies simply cannot offer:

• White-label packaging — We supply seals in neutral packaging ready for your own branding, helping you build your parts brand without tooling investment.
• Custom packaging — Full-color printed boxes with your logo, part number, and barcode — minimum order quantities start as low as 500 pieces.
• Strict quality control — Every production batch undergoes dimensional inspection, hardness testing, and lip force measurement before release. Certificates of conformity are available upon request.
• Cross-reference support — Our engineering team can match your existing seal samples or competitor part numbers to confirm the correct METTLEAD equivalent.

Explore our full range of Chinese truck parts and engine components to consolidate your sourcing with a single reliable supplier.

Frequently Asked Questions

What causes a crankshaft front oil seal to fail prematurely?

The most common culprits are excessive crankshaft end-play, a worn or scored sealing surface on the crankshaft journal, and overheated engine oil that degrades the lip material. Contaminated oil carrying abrasive particles also accelerates lip wear. When replacing the seal, always inspect the shaft surface for grooves deeper than 0.25 mm — a repair sleeve may be needed for a lasting fix.

How do I confirm that D02B-104-02A+B is the correct part for my engine?

Cross-reference the number stamped on your existing seal or check your Shangchai engine’s parts manual under the timing cover assembly section. If you are unsure, send us a photo of the old seal along with your engine nameplate data, and our technical team will verify compatibility within 24 hours.

What is the expected service life of this crankshaft front oil seal?

Under normal operating conditions — clean oil, proper crankshaft surface finish, and temperatures within the rated range — this FKM seal typically delivers 8,000 to 12,000 operating hours before requiring replacement. Severe-duty applications with frequent thermal cycling may reduce this interval to approximately 6,000 hours.

Can this seal handle higher-than-normal crankcase pressure?

This seal is rated for static pressures up to 0.05 MPa. If your engine exhibits elevated crankcase pressure (often indicated by oil misting from the breather), the root cause — typically worn piston rings or a blocked PCV system — should be addressed first. Installing a new seal without correcting excess pressure will result in premature lip blow-out.

Is the D02B-104-02A+B seal available for bulk orders with short lead times?

Yes. METTLEAD maintains rolling stock of high-demand Shangchai seals. Standard orders of up to 1,000 pieces typically ship within 3–5 business days. Larger volumes or custom-packaged orders require 10–15 days production lead time.

Request Your Quotation Today

Every day a leaking crankshaft seal goes unreplaced, you risk contaminated accessories, unplanned downtime, and rising oil costs. METTLEAD Truck Parts is ready to supply the Crankshaft Front Oil Seal D02B-104-02A+B at factory-direct pricing with fast, reliable global shipping.

Take the next step:

• Tell us your required quantity and delivery destination.
• Ask about volume discounts for orders over 200 pieces.
• Request a free sample for fitment verification.

Contact us now to get a competitive quote within 12 hours. Our export team speaks your language and understands your timeline.