Valve Stem Oil Seal 4003966 For QSM11 ISM11 M11 Diesel Engine
Keywords: 4003966 valve stem oil seal, M11 valve oil seal, QSM11 ISM11 valve stem seal, diesel engine valve seal, engine overhaul sealing parts, aftermarket valve stem sealing set
🔹Product Overview
Valve Stem Oil Seal Part No.4003966 is precision‑engineered valve stem sealing component, compatible with QSM11, ISM11, M11 diesel engines widely fitted on excavators, heavy‑duty trucks and industrial machinery. It installs on intake and exhaust valve stems, controlling lubricating oil supply for valve stems, preventing excessive engine oil from entering combustion chamber, avoiding blue smoke exhaust and carbon deposit buildup on valves. This replacement valve stem seal resolves typical failures including engine burning oil, blue smoke from exhaust, valve carbon accumulation caused by rubber aging, lip wear and seal failure under high‑temperature working environment. Manufactured to OEM dimensional standard for engine overhaul assembly.
🔹Detailed Specifications
| Item |
Details |
| Part Number |
4003966 |
| Product Name |
Valve Stem Oil Seal |
| Fit Engine |
QSM11, ISM11, M11 Diesel Engine |
| Fit Application |
Excavator, heavy‑duty truck and industrial machinery engine repair & overhaul |
| Function |
Prevent excess engine oil entering combustion chamber, reduce oil burning and exhaust blue smoke |
| Type |
Aftermarket New Overhaul Sealing Spare Parts |
| Quality Standard |
OEM dimension tolerance, high temperature and oil‑resistance performance test before shipment |
| MOQ |
1 UNIT |
| Packing |
Independent dust‑proof plastic wrapping + export outer carton |
| Price Term |
Negotiable, EXW / FOB / CIF terms are supported |
| Delivery Time |
3‑7 days for in‑stock items |
🔹Key Features & Advantages
- ✅ Exact OEM inner bore, outer diameter and lip profile, perfect matching for M11 series intake & exhaust valve stems.
- ✅ Premium heat‑resistant rubber material, outstanding oil‑resistance, anti‑aging and lip resilience performance.
- ✅ Stable sealing performance under long‑term high‑temperature valve operation condition, not easy to harden or leak oil.
- ✅ Effectively restrain engine oil consumption, eliminate exhaust blue‑smoke fault, reduce valve and piston carbon deposits.
- ✅ Every batch of valve stem seals passes dimension and appearance inspection before factory delivery.
- ✅ Indispensable sealing spare part for full engine overhaul and valve maintenance work.
🔹Application Scope ‑
Fit Equipment: Excavators, heavy‑duty trucks and industrial machinery equipped with QSM11 ISM11 M11 diesel engine ‑ Widely used for machinery repair workshops, vehicle fleet maintenance and engine overhaul projects.
🔹Our Company Advantage
We are professional supplier of full‑range construction machinery spare parts, supplying hydraulic parts, engine parts, electrical parts, seal kits and complete overhaul kits. ‑ Large ready stock for various machinery spare parts ‑ Factory‑direct wholesale competitive price ‑ Mixed‑order & one‑stop spare‑parts procurement supported ‑ Professional part‑number matching technical support service
🔹Packaging & Shipping ‑
Independent plastic dust‑proof packaging, avoid scratch and extrusion deformation in transit ‑ Export‑grade outer carton for safe sea and land transportation ‑ Multiple shipping options: sea freight, air freight, international express for small trial orders ‑ Export documents such as Commercial Invoice, Packing List can be provided.
🔹Contact Us
If you need more excavator spare parts or other construction machinery replacement components, please send your parts list to us. We will offer our best quotation for you quickly.
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