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Torque Specifications · 12 · Engine Electrics

Spark plugs — BMW factory, '79 and 1981 sheets

ft-lb
14.7 + 3.7
Nm
20 + 5
Prep
dry threads
Applies · '79 onward
Thread · M14×1.25
BMW-WSM7 20–25 N·m — the later factory figure, printed identically on the 11.78 and 3.82 sheets. Alloy head; go by feel rather than chasing the top. Note where this leaves the shop practice below: 13.5–15 ft-lb with anti-seize sits just under BMW's own dry minimum of 14.7, which is about what you would expect once the thread is lubricated.

This is the book's general row. In the book, pick your model and year and this figure resolves to your machine, with the one-page torque sheet, the job pages and the printable booklet.

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Also in 12 · Engine Electrics