Highlight:
CAT D9R engine piston ring seal
, heavy-duty PU-NBR piston seal
, D9T engine piston ring
1. Quick Details of seal 6P-8369:
| Part NO. |
6P-8369 |
| Machine |
Crawler Tractor |
| Size |
OEM |
| Material |
PU |
| Oil seal type |
rubber and steel
|
2. 6P-8369 parts on group :
| NO. |
PART NO. |
PRAT NAME |
QTY |
| 1 |
1Z-9338 |
ADAPTER |
4 |
| 2 |
1Z-9339 |
SEAL-LIP TYPE |
4 |
| 3 |
3B-8489 |
FITTING-GREASE (1/8-27 PTF) |
2 |
| 4 |
6P-8369 |
SEAL |
2 |
| 5 |
9U-7069 |
CAP/PLUG-TAPERED |
4 |
| 6 |
95-8002 |
PLUG (7/16-20-THD) |
2 |
| 7 |
117-4015 |
BUSHING |
2 |
| 8 |
380-7428 |
VALVE AS-RELIEF |
2 |
| 9 |
5F-1678 |
SEAL-O-RING |
1 |
| 10 |
380-7674 |
BEARING-SELF-ALIGNING |
2 |
| 11 |
2F-5326 |
SETSCREW (3/8-16XO.375-IN) |
8 |
| 12 |
3J-7354 |
SEAL-O-RING |
2 |
| 13 |
5L-4751 |
RING-RETAINING |
4 |
3. 6P-8369 picture:
4. Service part number :
| PART NO. |
PART NO. |
Part NO. |
| 7D-7519 |
095--1750 |
8M4390 |
| 1293719 |
095-1710 |
9X4611 |
| 2979545 |
095-1590 |
2256948 |
| 2H-6340 |
095-1582 |
1J2150 |
| 5D-7523 |
095-1751 |
1142687 |
| 2D-6533 |
095-1586 |
1173036 |
| 8M-4389 |
095-1608 |
6V6228 |
| 9H-3360 |
367-8471 |
5J2974 |
| 6F-8146 |
367-8472 |
1362967 |
| 3D-8422 |
095-1587 |
6V3251 |
| 6V-1196 |
095-1603 |
6J2419 |
5. FAQ
Q: What problems occur if a low‑quality seal is used in the D9R engine?
A: Cheap seals use low‑grade rubber that hardens and cracks at high temperatures, and weak plastic that deforms under pressure. They fail within 500–1,000 hours, causing excessive oil consumption, blue exhaust smoke, and power loss. Blow‑by gases increase, contaminating engine oil and accelerating wear on bearings and crankshaft. Severe cases lead to cylinder scoring, engine overheating, and costly rebuilds.
Q: What’s the typical service life in a working D9R dozer?
A: With regular oil changes and proper maintenance, it lasts 6,000–8,000 working hours—2–3 times longer than generic seals. The PU‑NBR hybrid resists heat aging and wear, maintaining consistent sealing performance. It reduces oil top‑ups and minimizes unplanned downtime, making it a cost‑effective choice for D9R owners.
Q: Which engine oils are compatible, and which should be avoided?
A: It works best with CAT DEO 15W‑40 or 10W‑30 diesel engine oils—these are formulated for high‑speed, heavy‑duty diesel engines and are fully compatible with NBR/PU. Avoid synthetic oils, high‑zinc oils, or vegetable‑based lubricants—these can cause NBR swelling, PU softening, or premature wear, leading to seal failure.
Q: Why can’t this seal be reused after engine disassembly?
A: It’s a precision, single‑use component. Once removed, the NBR lips lose their spring tension and elasticity due to heat and pressure. The PU core may develop micro‑cracks or deformation. Reusing it guarantees oil leaks, poor compression, and early failure. Always install a new seal during engine overhaul to ensure reliability.
Q: What makes 6P‑8369 ideal for CAT D9R heavy‑duty engines?
A: It’s an OEM‑engineered combustion seal designed exclusively for the D9R’s 3408/3412 engine. The PU‑NBR hybrid delivers unmatched heat resistance, wear resistance, and sealing performance. Exact dimensions ensure a perfect fit without modifications. It reduces oil consumption, maintains power, and protects expensive engine components. For D9R dozers in harsh jobsites, it’s the ultimate reliability solution.
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