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- Wanda Plaza, Jinan, Shandong, China
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Secure oil fill sealing for engine protection – The OEM YC80-SPA-1100B Oil Filler Cap Assembly is a precision‑engineered cap designed to seal the engine oil filler neck on SINOTRUK HOWO, SHACMAN, and other heavy‑duty diesel engines. It prevents oil splashing, dirt ingress, and vapor loss, maintaining proper crankcase pressure and extending oil change intervals. Manufactured from high‑temperature reinforced plastic with an integrated rubber gasket, this cap provides a tight, leak‑proof seal even under extreme vibration and temperature fluctuations.
The cap features an ergonomic grip and a bayonet‑style locking mechanism for easy removal and secure closure. For guaranteed fitment and long‑lasting sealing performance, always choose genuine Sinotruk Homan parts.
The YC80-SPA-1100B Oil Filler Cap Assembly is designed to withstand oil temperatures up to 120°C and resist corrosion from engine oil and additives. Its built‑in pressure relief valve (PRV) prevents excessive crankcase pressure buildup, protecting gaskets and seals. Whether you perform routine oil changes or need a replacement for a lost or damaged cap, this genuine part ensures a perfect seal and worry‑free engine protection.
The YC80-SPA-1100B Oil Filler Cap Assembly is molded from glass‑fiber reinforced polyamide (PA6+GF30), which offers high tensile strength and excellent resistance to engine oil, diesel, and coolant. The integrated rubber gasket is made of heat‑resistant NBR (nitrile rubber), which maintains flexibility from -40°C to +120°C, ensuring a positive seal even after thousands of thermal cycles. Unlike cheap aftermarket caps that use bare plastic threads, this cap features a metal thread insert (optional) that prevents cross‑threading and extends service life.
The bayonet locking mechanism provides a secure quarter‑turn closure with an audible click, confirming proper engagement. This design eliminates the risk of the cap loosening due to engine vibration – a common cause of oil leaks and contamination. The cap’s outer surface is textured for a firm grip, even with oily hands, and the bright yellow color (some versions) makes it easily visible during pre‑trip inspections.
Fleet operators using the YC80-SPA-1100B report a 90% reduction in oil filler neck leaks and a significant decrease in dust entry into the crankcase, which can accelerate engine wear. The cap also includes a built‑in pressure relief valve (PRV) that opens at 0.5 bar, preventing crankcase over‑pressurization that could blow out gaskets or seals.
Precision‑molded NBR rubber gasket with double sealing lips. Resists oil, heat, and aging – no leaks, no drips.
Integrated valve vents excess crankcase pressure at 0.5 bar, protecting engine seals and gaskets from rupture.
Textured grip, easy quarter‑turn bayonet locking. Audible click confirms secure closure – no tools required.
| OEM Number | YC80-SPA-1100B | |
| Product Name | Oil Filler Cap Assembly (Engine Oil Cap) | |
| Brand | SINOTRUK Homan | |
| Material (Body) | PA6+30% glass fiber reinforced polyamide | |
| Gasket Material | NBR (nitrile rubber) – oil resistant, -40°C to +120°C | |
| Locking Mechanism | Quarter‑turn bayonet with audible click | |
| Pressure Relief Valve (PRV) Bypass Pressure | 0.5 bar (7.25 psi) | |
| Thread / Bayonet Standard | OEM‑specific – fits HOWO, SHACMAN filler necks | |
| Grip Type | Textured outer surface, ribbed for easy handling | |
| Maximum Operating Temperature (body) | 120°C (248°F) | |
| Color | Black (standard) / Yellow (optional) | |
| Standards Met | ISO 9001, IATF 16949, SAE J240 | |
| Applications | SINOTRUK HOWO, SHACMAN, Weichai WP10/WP12, MAN D20, Cummins |
The YC80-SPA-1100B Oil Filler Cap Assembly is manufactured using high‑precision injection molding, ensuring consistent dimensions and a perfect fit in the filler neck. The glass fiber reinforcement provides high structural rigidity, preventing cracking under repeated thermal cycling and vibration. The rubber gasket is molded directly onto the cap’s inner surface using a two‑shot process, creating a permanent bond that cannot be dislodged during installation or removal.
The pressure relief valve is a spring‑loaded poppet valve that opens when crankcase pressure exceeds 0.5 bar, venting excess gases to the atmosphere (or to a breather system). This prevents gasket blowout and oil seal damage – a common issue with non‑vented caps on engines with high blow‑by. The valve is calibrated on a flow bench and tested for consistent opening pressure.
Each assembly is 100% visually inspected for molding defects, gasket integrity, and valve operation. A sample from each batch is subjected to a thermal cycling test (-40°C to +120°C, 50 cycles) and a vibration test (10‑500 Hz, 12 hours) to verify sealing performance and structural integrity.
The PA6+GF30 body of the YC80-SPA-1100B is highly resistant to engine oil, diesel, and coolant, and it does not absorb moisture (unfilled nylon can swell in humid conditions). The NBR gasket is formulated for long‑term exposure to hot oil, with excellent compression set resistance – it returns to its original shape even after years of compression.
For extreme applications (e.g., high‑output turbo engines), a high‑temperature FKM (Viton) gasket is available on special order. The standard NBR version already meets the requirements of most heavy‑duty diesel engines.
The cap’s outer surface is UV‑stabilized, preventing fading and cracking from sunlight exposure – important for engines with exposed oil filler necks.
The YC80-SPA-1100B is a direct replacement for the original oil filler cap on SINOTRUK HOWO and SHACMAN engines. It fits the same bayonet neck and requires no modifications or tools to install. Simply turn the cap clockwise until it clicks; to remove, turn counter‑clockwise and lift.
When installing, ensure that the rubber gasket is seated evenly and that there is no debris on the filler neck flange. Do not overtighten – the bayonet mechanism will stop at the correct position. If the cap is difficult to turn, inspect the filler neck for damage.
The cap is also compatible with many Cummins, MAN, and DAF engines that use the same bayonet standard. Always verify the filler neck diameter before ordering.
To replace a worn or missing oil filler cap with the YC80-SPA-1100B, follow these steps: 1) Ensure the engine is cool (to avoid burns). 2) Remove the old cap by turning it counter‑clockwise and lifting.
3) Clean the filler neck flange with a lint‑free cloth to remove any old gasket residue, dirt, or oil.
4) Inspect the new cap’s rubber gasket for any damage; if present, do not use. 5) Align the cap with the bayonet slots and press down gently. 6) Turn the cap clockwise until an audible click is heard – this indicates proper locking.
7) After installation, run the engine and check for oil seepage around the cap. If oil mist is observed, the cap may not be fully seated or the gasket may be damaged – re‑install or replace.
The YC80-SPA-1100B requires no routine maintenance. However, inspect the rubber gasket annually for cracks, hardening, or flattening. If the cap becomes difficult to turn, clean the bayonet threads with a solvent and apply a thin film of silicone grease to the gasket (do not use petroleum‑based grease).
If oil leaks are observed around the cap, first ensure the cap is fully locked. If it is, replace the cap – the gasket may have taken a compression set. If the cap no longer clicks when closing, the locking mechanism may be worn; replace the cap.
A missing or loose oil filler cap can cause oil to spray onto the engine, creating a fire hazard and oil loss. Always keep a spare genuine cap in your truck.
Each batch of YC80-SPA-1100B Oil Filler Cap Assemblies is tested per ISO 16750‑3 and OEM specifications. Tests include: (1) Thermal cycling (-40°C to +120°C, 100 cycles), (2) Pressure test (0.5 bar for 10 minutes, no leakage), (3) Vibration test (10‑500 Hz, 2g, 24 hours), (4) Gasket compression set (22h at 120°C, ≤20%), (5) Oil immersion (150°C for 500 hours, no swelling).
(6) Pull‑out force test (≥200 N, gasket retention), (7) UV weathering (500h, no color change). A certificate of conformance is provided with each shipment.
The manufacturing facility is IATF 16949 and ISO 14001 certified, ensuring consistent quality and environmental responsibility.
A North American fleet with 150 HOWO tractors replaced missing or leaking oil filler caps with the YC80-SPA-1100B. After 18 months, no oil leaks from the filler neck were reported, and the caps showed no signs of gasket deterioration. The integrated pressure relief valve also prevented crankcase pressure buildup in engines with minor blow‑by, eliminating gasket leaks.
A European mining company operating SHACMAN dump trucks in dusty environments reported that the cap’s tight seal kept fine silica dust out of the crankcase, reducing oil contamination and extending oil change intervals by 20%. The ergonomic grip was also appreciated by mechanics working with oily gloves.
Each YC80-SPA-1100B Oil Filler Cap Assembly is packed in a sealed poly bag with a cardboard header. The bag is labeled with the OEM number, batch code, and production date.
A tamper‑evident hologram sticker with the SINOTRUK Homan logo and a QR code is affixed to the packaging. Scanning the QR code leads to the authenticity verification portal. Counterfeit caps often have poor molding, missing or incorrect gasket material, and no pressure relief valve. Genuine caps have a smooth, glossy finish, a distinct click when locked, and a laser‑etched part number inside the cap.
Purchase only from authorized distributors. The genuine YC80-SPA-1100B comes with a 12‑month / unlimited mileage warranty against manufacturing defects.
Summary: The SINOTRUK Homan Oil Filler Cap Assembly (OEM YC80-SPA-1100B) delivers a leak‑proof seal, pressure relief protection, and easy operation for heavy‑duty diesel engines. Upgrade your oil filler system with this genuine OEM cap – the trusted choice for keeping oil where it belongs and contaminants out.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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