Torque Reference

Subaru Boxer — EJ · EG · EZ · EE · FA · FB

Subaru horizontally-opposed petrol and diesel engines — factory bolt torque specifications.

Head bolt procedure

EJ cylinder head bolts (M10): Step 1 — 29 Nm (22 lb-ft). Step 2 — fully loosen all bolts in reverse sequence. Step 3 — 29 Nm (22 lb-ft). Step 4 — tighten +90°. Step 5 — tighten a further +90° (turbo: +80°+45°). Final clamp ≈ 78 Nm (58 lb-ft).
EZ30 / EZ36 head bolts (M11): Step 1 — 29 Nm. Step 2 — loosen fully. Step 3 — 29 Nm. Step 4 — +90°. Step 5 — +90°.
FA / FB head bolts (M11): Step 1 — 34 Nm (25 lb-ft). Step 2 — +90°. Step 3 — loosen fully. Step 4 — 34 Nm. Step 5 — +90°. Step 6 — +90°.
EE20 diesel head bolts (M12): Step 1 — 70 Nm (52 lb-ft). Step 2 — +90°. Step 3 — +90°. Replace bolts on every removal.
Always work from the centre outwards in the factory sequence and replace TTY (torque-to-yield) bolts after one use.

Fastener	Nm	lb-ft
EJ — Cylinder head bolts (see procedure) — Final stage · 58 lb-ft	78	58 lb-ft
EJ — Connecting rod cap bolts (angle: +90°) — +90° · 9 lb-ft + angle	12	9 lb-ft
EJ — Main bearing cap bolts (M11) — 44 lb-ft	59	44 lb-ft
EJ — Main bearing cap bolts (M8) — 18 lb-ft	25	18 lb-ft
EJ — Flywheel / drive plate bolts — 52 lb-ft	71	52 lb-ft
EJ — Crankshaft pulley bolt (single-cam: 130 Nm) — DOHC · 129 lb-ft	175	129 lb-ft
EJ — Camshaft sprocket bolt (DOHC) — 58 lb-ft	78	58 lb-ft
EJ — Camshaft cap bolts — 7 lb-ft	10	7 lb-ft
EJ — Oil pump to block bolts — 4 lb-ft	6	4 lb-ft
EJ — Oil pan bolts (steel) — 3.5 lb-ft	5	4 lb-ft
EJ — Oil drain plug — 32 lb-ft	44	32 lb-ft
EJ — Spark plugs (M12) — 15 lb-ft	20	15 lb-ft
EG33 / EZ30 / EZ36 — Head bolts (see procedure) — Final stage · 55 lb-ft	75	55 lb-ft
EZ — Connecting rod cap bolts (angle: +80°) — +80° · 15 lb-ft + angle	21	15 lb-ft
EZ — Main bearing cap bolts (M11, angle: +45°) — +45° · 22 lb-ft + angle	29	21 lb-ft
EZ — Crankshaft pulley bolt — 177 lb-ft	240	177 lb-ft
EZ — Flywheel / drive plate bolts — 52 lb-ft	71	52 lb-ft
FA / FB — Cylinder head bolts (see procedure) — Final stage · 55 lb-ft	75	55 lb-ft
FA / FB — Connecting rod cap bolts (angle: +45° + 45°) — +45° + 45° · 15 lb-ft + angle	21	15 lb-ft
FA / FB — Main bearing cap bolts (M11, angle: +45°) — +45° · 22 lb-ft + angle	29	21 lb-ft
FA / FB — Crankshaft pulley bolt — 177 lb-ft	240	177 lb-ft
FA / FB — Flywheel / drive plate bolts — 52 lb-ft	71	52 lb-ft
FA / FB — Camshaft sprocket bolt — 58 lb-ft	78	58 lb-ft
FA / FB — Chain tensioner bolts — 7 lb-ft	10	7 lb-ft
FA / FB — Spark plugs — 15 lb-ft	20	15 lb-ft
FA / FB — Oil drain plug — 31 lb-ft	42	31 lb-ft
All series — Intake manifold to head — 18 lb-ft	25	18 lb-ft
All series — Exhaust manifold to head — 22 lb-ft	30	22 lb-ft
All series — Water pump bolts — 9 lb-ft	12	9 lb-ft
All series — Engine to transmission bolts (M12) — 52 lb-ft	70	52 lb-ft
All series — Engine mount through-bolt — 41 lb-ft	55	41 lb-ft

Source: Subaru factory service manuals (FSM) for the EJ, EG, EZ, EE, FA and FB engine families. Values vary by sub-variant (e.g. EJ20T vs EJ257, FA20DIT vs FA24F) — always confirm against the FSM for your specific engine code before final assembly.

Conversions are rounded (1 Nm ≈ 0.7376 lb-ft). Always torque in the correct sequence and in stages. Verify against your engine builder's instructions for performance or modified assemblies.