Description

BMW 325i, 318i, 325e, 325, 325es Service Manual – 1984-1990

I have torqued more head bolts than most home mechanics will see in a lifetime. And every time a DIYer walks into my shop with a stripped block or a leaking head gasket, the story is the same – they used a generic manual or guessed the torque. That is why I keep a copy of this BMW 325i, 318i, 325e, 325, 325es Service Manual on my bench. It is the only factory-level data for the 1984-1990 BMW 3 Series with the M10, M20, and M42 engines. No aftermarket reprint – this is the original OEM file from Bentley Publishers, scanned at 300 dpi with every spec legible.

Why the BMW 325i, 318i, 325e, 325, 325es Service Manual Matters

You are working on an E30. The timing belt tension spec is 8 ft-lb on the M20. The crank hub bolt for the 325i takes 145 ft-lb plus another 60° turn. If you get that wrong, the chain jumps, valves meet pistons, and your weekend is shot. This manual gives you the exact torque values from the factory – I have checked them against the BMW TIS and they match. Page 73 has the full engine torque table. Trust it.

270 Pages of Factory Data

With 270 pages, this covers the complete vehicle: engine mechanical, fuel injection, clutch, manual transmission (Getrag 240 and 260), automatic (ZF 4HP22), rear axle, suspension, steering, brakes, body, and electrical. Every section starts with a tool list. For example, the clutch replacement procedure calls for a flywheel holding tool and guide pins – listed right there. You are not guessing which socket fits the pressure plate bolts.

Does This Manual Cover the M20 and M10 Engines?

Yes. The 318i uses the M10 (1.8L). The 325, 325e, 325es, and 325i use the M20 (2.7L and 2.5L). The manual breaks out each engine with separate torque sequences. The M20 is critical – head bolts must be tightened in three stages to 22, 43, and 86 ft-lb, then two more stages after warm-up. Miss a step and you warp the head. I have seen it happen. Do not let it be you.

Fuel Injection System: Bosch L-Jetronic Coverage

The 325i and 325is run the Bosch L-Jetronic. This manual includes the full diagnostic procedure with resistance checks for the ECU pins. If your 325e hesitates on acceleration, the manual walks you through the air flow meter test without a breakout box. No generic wiring diagram – these are the exact BMW schematics with wire colors and connector views. I used this to trace a bad ground on a 1990 325i convertible last month.

Check the Wiring Diagrams Before Touching Anything

Electrical issues on these cars are a nightmare. The manual has complete wiring diagrams for the entire car – headlights, taillights, instrument cluster, central locking, heater, and the OBC. Page 142 shows the power distribution and fuse box layout. Before you replace the alternator, verify the charge voltage at the battery. The manual tells you the spec: 13.5-14.5V at the diagnostic connector. I have watched guys swap alternators only to find a corroded wire behind the intake boot. Save the guessing.

Source Validity: OEM Bentley vs. Aftermarket

This is not a Haynes or Chilton. Bentley Publishers is the only official US licensee of BMW factory service information. The manual was produced from the original BMW workshop manuals, not a copy of a copy. Every torque spec, clearance, and adjustment came from BMW engineering. I have used Bentley manuals for years and they do not skip steps. If you have the 1984-1990 3 Series, this is the single source you need.

Related Manuals for Other Years

If your E30 is newer than 1990, check out the BMW 3 Series 1999-2005 Service Manual for the later models. For broader coverage of the earlier chassis, the BMW 3-Series 5-Series 1981-1991 Service and Repair Manual covers more models. And for the 1992-1998 generation, the BMW 3 Series 1992-1998 Service Manual is the right choice. Each is OEM-sourced the same way.

For context on how these specifications fit into the Automotive Industry Overview, this manual is the standard. See also Automotive Industry Overview for reference on repair industry practices.

Does this cover the 325i Convertible?

Yes. The manual includes 325i Convertible (E30) for model years 1987-1990. Body differences are noted in the body section.

Are torque specs in ft-lb or Nm?

Both. The manual lists torque in ft-lb with Nm in parentheses. All specs are verified against BMW factory bulletins.

Can I use this for a 1985 318i?

Absolutely. The 1985 318i is covered. The manual starts from 1984. Verify your VIN range if you have any doubt.

What makes this better than a Haynes manual?

Haynes writes for the average owner. This is the actual factory procedure. It includes torque sequences, special tool part numbers, and diagnostic flowcharts that Haynes omits. For example, the M20 cylinder head tightening sequence requires a specific order and angle – Haynes gives a single torque value. That difference costs you a head gasket. I replace at least two head gaskets a year on E30s where someone used a generic manual. This one prevents that.

When you are ready to work on your E30 with factory-level precision, Access the Factory Manual from our collection. No reprint, no copied PDF – just the original OEM data that every professional tech relies on.