The BMW 740iL Belt Tensioner Bolt is designed to keep the serpentine belt at the proper tension to ensure the components get power without squeal and slip. Forged from rust-resistant hardened steel for strength and reliability, the Belt Tensioner Bolt withstands intense underhood heat and vibration, which is an important reason for owners' confidence in long-term performance. According to BMW quality standards, the hardness and thread pitch have tight tolerances; therefore, the Belt Tensioner Bolt meets original BMW specifications and can be installed directly without additional work. The Belt Tensioner Bolt, which is optimal suited for the BMW, fits into both the earlier spring-loaded tensioner as well as the later damper-equipped unit. Thus, whether the sedan is a 1994, refreshed 1999, or the final 2001, the 740iL receives the same snug, precise fit. The Belt Tensioner Bolt provides precise pivot load to ensure even alternator output for battery charging and eliminates the high RPM stress on pulley bearings that can occur with belt flutter. Steering effort smoothness and steady air conditioning with quiet starts show how a tiny part can offer a big performance boost. Because of how long it can take for a worn fastener to finally loosen, sudden belt loss can follow. However, replacing yours with a factory spec Belt Tensioner Bolt restores factory geometry in just minutes. More importantly, that allows the 740iL driver to focus on the road while returning the 740iL to peak efficiency and preventing damage to any expensive components in the process. Another benefit is security because the dependable belt drive enables the 740iL to retain complete power assist for both brakes and cooling when it slows its speed on a steep incline. Enthusiasts realize that authentic BMW parts are still reasonably priced in comparison to the damage a neglected driveline can inflict. All high mileage 740iL models making a trip would benefit from exchanging out the Belt Tensioner Bolt before departing. This would offer peace of mind and keep the 740iL cruising smooth.
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