BYD Qin PLUS DM-i Valve Cover Gasket

Product Specification

As a professional automotive engine sealing parts manufacturing factory, we proudly present the Valve Cover Gasket designed specifically for the BYD Qin PLUS DM-i (5th Generation DM Super Hybrid) .

The valve cover gasket is a critical sealing component between the valve cover and the cylinder head. Installed at the junction between the valve cover and cylinder head, it seals the engine oil within the valve chamber, preventing oil from leaking to the exterior or into the spark plug holes. The gasket is typically made of oil-resistant, high-temperature rubber/silicone material, offering excellent sealing performance and aging resistance.

The BYD Qin PLUS DM-i is equipped with the BYD472QC 1.5L Xiaoyun engine, featuring Atkinson cycle with a maximum thermal efficiency of 43%, compression ratio of 15.5:1, maximum horsepower of 101Ps, maximum power of 74kW, and maximum torque of 126N·m. As a key component of the engine sealing system, the valve cover gasket's sealing performance directly affects engine oil consumption and operational stability.

In daily use, the valve cover gasket is long exposed to high temperature, high pressure, and oil immersion, making it prone to rubber aging/hardening, loss of elasticity, and cracking – leading to valve cover oil seepage or leakage. Typical failure symptoms include: oil stains on the engine surface, oil in spark plug holes (causing misfire), abnormal oil consumption, and a burning smell from the engine bay. It is one of the most commonly replaced components in engine maintenance.

Our product is strictly developed to original Qin PLUS OE specifications, manufactured from high-quality oil-resistant rubber (NBR/PVMQ) material with precision vulcanization molding, offering excellent high-temperature resistance, oil resistance, and compression set performance. Dimensions precisely match the original 1:1 for easy installation – direct replacement for aged or damaged original valve cover gaskets, restoring engine sealing performance.

Strictly developed to original BYD472QC engine OE specifications, with valve cover gasket contour dimensions, mounting hole positions, and sealing rib locations precisely matching the original 1:1. Compatible with all 2021-2025 Qin PLUS DM-i models equipped with the BYD472QC 1.5L Xiaoyun engine, including 55KM/120KM range versions and Zhijia Edition.

The BYD472QC engine features Atkinson cycle operation with high operating temperatures and thermal loads, demanding high temperature resistance and reliability from sealing components. Our product fully considers the engine's thermal management characteristics, ensuring reliable sealing under high-temperature conditions.
The valve cover gasket is manufactured from high-quality oil-resistant rubber (NBR/PVMQ) material, offering the following properties:

• High Temperature Resistance: Operating range -40°C to 150°C, suitable for high-temperature engine environments

• Oil Resistance: Excellent resistance to oil corrosion – no swelling or hardening under prolonged immersion

• Low Compression Set: Maintains good elasticity after long-term compression for reliable sealing

• Aging Resistance: Anti-aging agents added to the material for extended service life

The product passes oil resistance testing, high-temperature aging testing, and compression set testing, ensuring reliable sealing throughout the engine's life cycle.
The valve cover gasket features precision vulcanization molding for high dimensional accuracy and good surface finish. The sealing surface features sealing ribs (anti-leak lines) that, under bolt preload, form multiple sealing barriers with the cylinder head to eliminate oil leakage.

Important Note: When replacing the valve cover gasket, recommended to replace the valve cover bolt seals simultaneously (if equipped). During installation, use a torque wrench to tighten bolts in 2-3 steps to the specified torque (typically 8-12 N·m) – over-tightening crushes the gasket, while under-tightening causes poor sealing.

Installation Instructions

Tool Preparation:

• 10mm socket wrench

• Torque wrench (required)

• Plastic pry tool

• Clean cloth

• Sealant (optional, per factory requirements)

Important Safety Note: Operation should be performed after the engine has cooled to prevent burns. Disconnect the battery negative terminal before operation.

Installation Steps:

1. Remove Accessories:Remove engine cover, ignition coils, wiring harness clips, and other accessories that obstruct access

2. Remove Valve Cover:Loosen valve cover bolts in a cross (diagonal) pattern progressively, remove valve cover

3. Clean Sealing Surfaces:Thoroughly clean old gasket residue and oil from the cylinder head sealing surface and valve cover – ensure surfaces are clean and dry

4. Install New Gasket:Position the new valve cover gasket into the groove, ensuring it is flat and not twisted

5. Install Valve Cover:Align the valve cover with locating pins, gently lower into place – be careful not to displace the gasket

6. Tighten Bolts:Use a torque wrench in a cross (diagonal) pattern in 2-3 steps, final torque 8-12 N·m

7. Reinstall Accessories:Reinstall ignition coils, wiring harness, engine cover, etc.

8. Road Test:Start the engine and check for oil leaks around the valve cover

【Professional Tips】

• Torque wrench is required – do not tighten by feel

• Cross pattern tightening is mandatory – prevents uneven gasket compression causing leaks

• Ensure sealing surfaces and gasket are clean and dry before installation

• If the original vehicle uses sealant, apply appropriate amount at specified positions per factory requirements