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DIY Guides

  • BMW E30 differential drive flange and output shaft seal held in hand, the parts renewed in this repair.

    BMW E30 Differential Output Seal Replacement Guide

    Difficulty: Intermediate | Time: A few hours per side | Applies to: BMW E30 (1984-1991), rear-wheel-drive models: 318i / 318is / 325e / 325es / 325i / 325is. The all-wheel-drive...

    Treedy Labs |

  • Failed BMW E30 odometer gears inside the opened speedometer unit, the drive gear worn and the train exposed

    BMW E30 Odometer Gear Replacement Guide

    Difficulty: Intermediate | Time: 3-5 hours first time, 1-2 hours once you know the job | Applies to: 1984-1991 BMW E30 (3 Series). The same VDO and MotoMeter clusters and...

    Treedy Labs |

  • A BMW E30 in the shop with its hood up, beside a chalkboard showing the M20 camshaft drive belt routing

    BMW E30 Timing Belt Replacement Guide

    Difficulty: Advanced | Time: A full day | Applies to: BMW E30 with the M20 six-cylinder (1984-1991): 325e / 325es / 325i / 325is / 325i Convertible. The four-cylinder 318i...

    Treedy Labs |

  • BMW E30 front brake caliper held in a bench vise during a rebuild with the piston pushed out by an air blow tip.

    BMW E30 Brake Caliper Rebuild Guide

    Difficulty: Advanced | Time: A full day, one caliper at a time | Applies to: BMW E30 (1984-1991), 318i / 318is / 325e / 325es / 325i / 325is. The...

    Treedy Labs |

  • A BMW E30 R-134a conversion kit laid out on a bench with the new receiver/drier, R-134a service-port adapters, pressure switch, and conversion label.

    BMW E30 R-12 to R-134a AC Conversion Guide

    Difficulty: Advanced | Time: A weekend for the mechanical work, plus a shop visit to evacuate and charge | Applies to: BMW E30 (1984-1991) with factory air conditioning: 318i /...

    Treedy Labs |

  • BMW E30 M20 oil pump, drive chain, and pickup screen exposed with the oil pan dropped away.

    BMW E30 M20 Oil Pan and Gasket Replacement Guide

    Difficulty: Advanced | Time: A full day | Applies to: BMW E30 with the M20 six-cylinder (1984-1991): 325e / 325es / 325i / 325is / 325i Convertible. The four-cylinder 318i...

    Treedy Labs |

  • Six BMW M20 fuel injectors lined up in a row on a clean white bench, cleaned and resealed.

    BMW Fuel Injector Clean and Reseal Guide

    Difficulty: Intermediate | Time: An afternoon | Applies to: BMW engines with Bosch port fuel injection: M10, M20, M30, M40 / M42 / M43 / M44, M50 / M52, and...

    Treedy Labs |

  • BMW E30 Torque Specifications - Complete Reference Guide

    BMW E30 Torque Specifications - Complete Reference Guide

    Note: Always use a calibrated torque wrench. Replace torque-to-yield (TTY) fasteners after removal. When in doubt, consult the full service manual for your specific engine and model year (1984-1993). BMW...

    Treedy Labs |

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