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{"title":"Valve Stem Seal Set for Komatsu 6D125-N Diesel Engine","imgUrl":"https:\/\/img.chinax.com\/nimg\/34\/a8\/b019b0f045b3535f111ad51cf23d-200x200-1\/valve_stem_seal_set_for_komatsu_6d125_n_diesel_engine.jpg","attrs":{"Place of Origin":"CHINA","Supply Ability":"9500","Packaging Details":"BOX","Minimum Order Quantity":"1"}}
Product Name: Crankshaft Front Oil Seal / Timing Gear End Oil Seal
Compatible Equipment: Komatsu PC30-7 Mini Excavator, small loaders & generators with 3D84-3 engine
Material: Reinforced NBR nitrile rubber with embedded metal skeleton
Seal Type: Single lip rotary shaft skeleton oil seal
Warranty: 6 Months
Core Function: Seals the gap between crankshaft front journal and timing gear housing, prevents engine oil leaking from the front end of crankshaft, protects timing chain/gear assembly from oil loss and dust contamination
Core Advantages
Exact OEM dimension 6204-21-3530, direct press-in fit for 3D84-3 engine, no machining or modification required.
Built-in metal rigid frame resists deformation under high engine temperature and continuous vibration.
Inner spiral anti-leak thread creates oil return pumping effect during crankshaft rotation for reliable long-term sealing.
Superior resistance to motor oil corrosion, heat aging and shaft friction wear, extends service life.
Product Description
This front crankshaft oil seal with OEM number 6204-21-3530 is a dedicated sealing component for Komatsu 3D84-3 three-cylinder diesel engine, installed at the timing gear cover side of the crankshaft. A worn, cracked or hardened front oil seal will cause continuous oil seepage onto timing components, leading to timing gear lubrication failure and premature engine damage. It is a standard replacement part during engine overhaul, timing cover disassembly and front crankshaft maintenance. Every unit undergoes dimensional tolerance, rubber hardness and sealing performance testing before shipment.
We supply parts for Kubota, Cum mins, CAT, Perkins, Yanmar, Isuzu, Komatsu, Mitsubishi, Hino, Nissan, Vo lvo, Deutz, Doosan, Daewoo, John Dee re, Scania, Hyundai, JCB etc.
FAQ
Q1: What faults indicate this front oil seal needs replacement?
A: Visible oil stains on the timing gear cover, oil dripping from the bottom front of the engine, gradual engine oil consumption without other external leaks.
Q2: Professional installation tips
A: Polish crankshaft front journal to remove burrs and scratches; use a flat pressing tool to install the seal vertically to avoid tilting and sealing lip tearing; coat a thin layer of clean engine oil on the inner lip before pressing home.
Q3: Can 6204-21-3530 be used on 3D84-1 engine?
A: Not interchangeable. 3D84-1 and 3D84-3 crankshaft front oil seals have different inner/outer diameters and thicknesses, please match strictly by engine model and OEM part number.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Ecer Certification：
Verified Supplier
Guangzhou Tianhe District Qianjin Yiling Machinery Parts Business Department, established in 2013, is a professional supplier focusing on high-performance engine repair kits and cylinder gaskets for construction machinery excavators, boasting solid capabilities in both standard product supply and cu... Guangzhou Tianhe District Qianjin Yiling Machinery Parts Business Department, established in 2013, is a professional supplier focusing on high-performance engine repair kits and cylinder gaskets for construction machinery excavators, boasting solid capabilities in both standard product supply and cu...
