9Y-1798 9Y1798 NBR Steel Water Seal Repair Kit for 140G 160G Road Motor Grader Diesel Engine Overhaul 3304B D330C

1. Quick Details of  seal 9Y-1798:

2. 9Y-1798 picture:

3. Service part number :

4. FAQ

Q: Which motor grader models can match this 9Y-1798 cylinder head water seal kit, and what core sealing functions can this integrated steel-sleeve sealing assembly realize for the engine cooling circuit?
A: This factory-standard sealing kit 9Y-1798 is tailor-made for 140G and 160G medium motor graders equipped with 3304 and 3306 inline six-cylinder diesel engines, installed at the cooling water pipeline interface of the cylinder head to separate cooling liquid and lubricating oil passages. Motor graders carry out long-term road leveling, slope trimming and construction site ground finishing tasks, with engines running under variable loads and frequent cold-hot temperature shifts. This integrated NBR steel sleeve seal acts as dual isolation barrier for cooling pipelines: it stops cooling liquid leaking outward to avoid engine overheating failure, and blocks high-temperature lubricating oil from permeating the water channel to prevent coolant emulsification and deterioration. The built-in seamless thin steel lining provides permanent radial support, avoiding rubber shrinkage and permanent deformation after long-term repeated thermal expansion and contraction cycles, so no extra auxiliary gaskets are needed during engine assembly. Each individual seal inside the kit is independently packaged with size identification marks, allowing maintenance staff to quickly pick matching parts during on-site engine disassembly, greatly cutting the overhaul working hours of road construction motor graders at municipal and highway construction yards.

Q: What unique dual-material composite sealing advantages does this steel-sleeve NBR seal kit have compared with full-rubber single seals sold in aftermarket parts shops for 3304/3306 engine cooling pipelines?
A: The 3304 and 3306 engines matched on 140G/160G motor graders work under year-round alternating cold and hot circulation conditions: cold startup at low-temperature mountain construction sites in winter, and continuous high-temperature operation above 95°C during summer road construction, while cooling liquid contains antifreeze additives and engine lubricating oil carries high-viscosity lubricating components. Ordinary single-layer full-rubber seals lack internal rigid supporting structures, prone to radial shrinkage after repeated thermal expansion and contraction, which will trigger slow cooling liquid seepage after several hundred working hours. This 9Y-1798 kit adopts a composite structure of seamless thin steel sleeve + high-density modified NBR nitrile rubber: the steel sleeve keeps the inner diameter dimension stable under temperature changes, effectively resisting extrusion deformation caused by water pressure fluctuations inside cooling passages; the optimized NBR rubber layer balances tolerance to ethylene glycol coolant and engine lubricating oil, avoiding swelling, hardening or cracking under long-term mixed fluid contact. Different from cheap low-density ordinary NBR seals, the rubber layer of this product is added with high-efficiency anti-aging additives, and its overall service life is greatly extended compared with single full-rubber seals, and no auxiliary sealing adhesive is required during installation to reduce assembly operation errors.

Q: How can field road machinery maintenance workers quickly distinguish each component of the 9Y-1798 seal kit through color, texture and structural differences?
A: A complete set of 9Y-1798 kits contains multiple identical cylinder head water seals, each with a two-layer composite structure that can be easily identified by vision and touch. The outer sealing body is uniform milky white dense NBR rubber, matte non-smooth surface, soft and elastic when squeezed, no white powder falling off after friction; the inner lining is silver thin seamless steel sleeve, smooth metallic luster can be seen at both ends of each seal, and its hard texture is completely different from rubber. Low-cost full-rubber alternative products are pure white or light beige rubber without metal lining, and the surface is slippery with excessive release agent residue. Every single seal is printed with tiny laser marking “9Y-1798” on the outer rubber wall, corresponding to the size specification of 3304/3306 cylinder head cooling holes, which can be quickly verified with a magnifying glass during inventory sorting and parts matching for motor grader overhaul.

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