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Starting at low prices, AutoBuffy stocks multiple engine balance shaft chain kits from top OE-quality brands. The balance shaft chain synchronizes the balance shafts to the crankshaft, canceling out engine vibration. When it stretches, jumps, or breaks, the engine runs rough, rattles loudly at startup, and can suffer serious internal damage if left unaddressed.
Balance shaft chain kits vary primarily in what components are included and the quality of materials used. At minimum you need the chain itself, but the tensioner, guides, and sprockets wear as a system and should be replaced together. Choosing a kit that matches or exceeds OEM specifications is critical because a loose or low-quality chain defeats the purpose of the balance shaft entirely.
| Option | Best for | What you get |
|---|---|---|
| Chain-only kit | Budget replacements when tensioner and guides are confirmed good | Replacement balance shaft drive chain, no hardware |
| Chain and tensioner kit | Engines with a known tensioner rattle but intact guides and sprockets | New chain plus hydraulic or mechanical tensioner; reduces startup rattle |
| Complete timing chain system kit | High-mileage engines or any job where the timing cover is already off | Balance shaft chain, tensioner, guides, sprockets, and often gaskets and seals; best long-term value |
| OE-equivalent branded kit | Owners who want factory-spec fit, finish, and longevity | Components manufactured to OEM tolerances by a recognized supplier; direct drop-in with documented quality control |
Replacing a balance shaft chain kit requires removing the timing cover, which typically means draining coolant, removing accessory belts, and sometimes dropping an engine mount to provide clearance. The crankshaft and balance shafts must be locked at their exact timing positions before the old chain is removed, and all new components should be installed in the order specified for your engine. Because incorrect timing of the balance shafts causes vibration rather than fixing it, this job is best suited to experienced DIYers or a professional mechanic with engine-specific service data.