Machinery Engine Parts Breather Tube 3971371, Construction Machinery Replacement Engine Vent Pipe

Keywords: 3971371, Breather Tube, 3971371 engine breather pipe, 4B3.9 6.7N B6.7 D6.7 ISB4.5 ISB5.9 ISBE QSB3.3 QSB4.5 QSB6.7 QSB7 engine spare parts, diesel engine crankcase ventilation tube, excavator engine parts, heavy‑duty engine breather component, construction machinery replacement parts

Product Overview

This breather tube Part No.3971371 is an essential crankcase ventilation component specially designed for 4B3.9, 6.7N, B6.7, D6.7, ISB4.5, ISB5.9, ISBE, QSB3.3, QSB4.5, QSB6.7, QSB7 diesel engine. It is used to vent excess pressure and blow‑by gas inside engine crankcase, keep stable internal pressure of engine, prevent oil leakage caused by high crankcase pressure, and reduce oil‑gas accumulation. Our aftermarket breather tube is strictly manufactured according to OEM specification, with excellent heat‑resistant, ageing‑resistant and deformation‑resistant performance. It works reliably under long‑time heavy‑load construction and mining working conditions. It is a reliable aftermarket spare part for engine overhaul and repair of construction equipment.

Detailed Specifications

Key Features & Advantages

• ✅ Precise OEM Dimension Strictly produced following original drawing data, precise size tolerance, perfect fit without installation gap.
• ✅ High‑Quality Plastic Material High‑strength engineering plastic, strong structure, not easy to crack or break under vibration.
• ✅ Excellent Heat & Ageing‑Resistant Performance Resist high‑temperature gas erosion, long‑time service without hardening or deformation.
• ✅ Stable Crankcase Ventilation Function Smooth inner channel for efficient gas circulation, effectively balance crankcase pressure and avoid engine oil blow‑by.
• ✅ Direct Plug‑in Replacement Fully interchangeable with original spare parts, easy installation without extra modification during engine repair.
• ✅ 100% Individual Testing Before Shipment Every single breather tube passes strict size and performance inspection before delivery, stable and reliable for engineering projects.

Application Scope

Fit for 4B3.9, 6.7N, B6.7, D6.7, ISB4.5, ISB5.9, ISBE, QSB3.3, QSB4.5, QSB6.7, QSB7 diesel engine, widely used on these heavy‑duty machines: Excavators, Bulldozers, Wheel Loaders, Motor Graders, Generator Sets, Heavy‑duty Trucks, And other construction machinery & industrial equipment equipped with above‑mentioned engine models.

Our Company Advantage

• We are a professional supplier for full‑series construction machinery engine spare parts. We can supply complete engine overhaul kits including breather tubes, oil seals, gaskets, connecting rod bearings, main bearings, thrust washers, intake & exhaust valves, valve seals, fuel injectors, fuel pump, nozzle, piston, cylinder liner, cylinder head gasket, turbocharger and other wearing spare parts.
• Rich stock for most popular 4B3.9, ISB, QSB, B6.7, QSB6.7 and other engine models
• Competitive factory direct price
• Fast shipment for in‑stock goods
• Accept mixed container order for one‑stop spare parts purchasing
• Provide professional technical matching service for your part number inquiry

Packaging & Shipping

• Independent shock‑proof inner package for precision breather tube
• Outer carton with shock‑proof protection for sea transportation
• Support sea freight, air freight, express delivery for small trial order
• Full export document can be offered (Commercial Invoice, Packing List)

Contact Us

If you need more spare parts for 4B3.9 / B6.7 / ISB / QSB series engine or other construction machinery, please send your part list to us. We will offer you our best quotation immediately.