Self Adjusting BMW E36 Timing Chain Tensioner 11318648732 For F20 F21 F30 F35 F10

1131 8648 732 Engine Timing Chain For BMW F20 F21 F30 F35 F10 E84 F48  Engine N20 N26 N55 N13 B38 B48

1. Product Overview

     The BMW Timing Chain (Part No. 1131 8648 732) is a critical component of the engine's valve train system, responsible for precisely synchronizing the rotation of the crankshaft and camshaft(s) to ensure accurate valve timing relative to piston movement. Compared to timing belts, this chain offers superior durability and is designed for BMW's turbocharged engines, including the N20 and B48 series.

2. Technical Specifications

3. Vehicle Compatibility Chart

Compatible Models (Partial List):

Note: Exact compatibility should be verified via BMW's ETK system or VIN lookup.

4. Product Advantages

✅ Extended Lifespan: Far more durable than timing belts, with a theoretical lifespan exceeding 200,000 km.
✅ Precision Synchronization: Ensures optimal valve timing for peak engine performance.
✅ Maintenance-Free Design: No scheduled replacements (unlike belts), but periodic inspections are recommended.
✅ High Tensile Strength: Special alloy steel with hardening treatment minimizes stretch over time.

5. Features & Functions

(1) Structural Features

• Multi-Plate Link Design: Reduces operational noise and enhances smooth engagement.

• Integrated Guide Teeth: Ensures precise meshing with camshaft/crankshaft sprockets to prevent skipping.

• Anti-Corrosion Coating: Withstands high-temperature, high-pressure engine conditions.

(2) Core Functions

• Synchronization Control: Guarantees precise opening/closing of intake and exhaust valves.

• Power Transmission: Transfers crankshaft rotation to the camshaft to drive the valvetrain.

• Self-Adjustment: Works with hydraulic tensioners to automatically maintain optimal chain tension.

6. Working Principle

1. Crankshaft Drive: The crankshaft rotates the timing chain, which drives the camshaft(s).

2. Gear Engagement: The chain meshes with the crankshaft and camshaft sprockets at a fixed ratio (typically 2:1).

3. Hydraulic Tensioning: The tensioner applies pressure to eliminate slack, preventing noise or skipping.

4. Lubrication Protection: Engine oil circulates to lubricate the chain, reducing friction and wear.

Failure Impact:

• If the chain stretches or the tensioner fails → Timing misalignment → Engine misfires, power loss, or even valve-to-piston collision.

7. Maintenance Recommendations

• Regular Inspection: Check chain tensioner and guide wear every 80,000 km.

• Noise Warning: A "rattling" sound during cold starts requires immediate attention.

• Complete Replacement: Replace the chain, tensioner, and guides together to avoid compatibility issues.