What is the cylinder head bolt tightening procedure?

Five steps: (1) tighten all bolts to 29 N·m (3.0 kg-m, 22 ft-lb); (2) tighten all bolts to 64 N·m (6.5 kg-m, 47 ft-lb); (3) loosen all bolts completely; (4) tighten all bolts to 29 N·m again; (5) tighten all bolts to 64 to 69 N·m (47 to 51 ft-lb), or with an angle wrench turn each bolt clockwise the specified degrees: 80° for the A (top row) bolts and 65° for the B (bottom row) bolts.

What is the final cylinder head bolt torque?

64 to 69 N·m (6.5 to 7.0 kg-m, 47 to 51 ft-lb).

What is the spark plug torque specification?

20 - 29 N·m (2.0 - 3.0 kg-m, 14 - 22 ft-lb).

What should be checked before tightening the cylinder head bolts?

Always use a new cylinder head gasket, make sure the oil pump drive gear can be turned freely by hand, and install washers between the bolts and cylinder head.

How should head bolts be re-torqued during normal maintenance?

First loosen each cylinder head bolt slightly, then tighten to 64 to 69 N·m (6.5 to 7.0 kg-m, 47 to 51 ft-lb). This should be done when the engine is cold.

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Nissan Micra Cylinder Head Installation - Torque Sequence & Specs (EM-16)

Nissan cylinder head installation EM-16 head bolt tightening sequence and torque procedure

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Cylinder head installation page with numbered bolt tightening order and multi-stage procedure: 29 N·m, then 64 N·m, loosen, 29 N·m, final 64-69 N·m or angle-torque 80/65 degrees.

AI caption April 2005 · Photo 70 of 412

This is page EM-16 of a Nissan factory service manual covering the continuation of cylinder head installation. It instructs installing the cylinder head with a new gasket (always using a new gasket, verifying the oil pump drive gear turns freely by hand before tightening, and installing washers between bolts and the head). A tightening order diagram (SEM580) shows the numerical sequence for the 10 head bolts. The tightening procedure is a five-step process: torque all bolts to 29 N·m (22 ft-lb), then 64 N·m (47 ft-lb), loosen all bolts completely, re-torque to 29 N·m, and finally torque to 64-69 N·m (47-51 ft-lb) or turn each bolt a specified angle with an angle wrench (80 degrees for A bolts, 65 degrees for B bolts per diagram SEM714A). For normal maintenance, bolts should be loosened slightly then re-torqued to 64-69 N·m with the engine cold. Subsequent steps cover installing the timing belt, oil pump idler and regulator spring (noting care for the spring's face), the upper dust cover with its gasket (diagrams SEM984 and SEM978, cover bolts torqued to 4-5 N·m / 2.9-3.6 ft-lb), and spark plugs torqued to 20-29 N·m (14-22 ft-lb).

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Frequently asked questions

What is the cylinder head bolt tightening procedure?: Five steps: (1) tighten all bolts to 29 N·m (3.0 kg-m, 22 ft-lb); (2) tighten all bolts to 64 N·m (6.5 kg-m, 47 ft-lb); (3) loosen all bolts completely; (4) tighten all bolts to 29 N·m again; (5) tighten all bolts to 64 to 69 N·m (47 to 51 ft-lb), or with an angle wrench turn each bolt clockwise the specified degrees: 80° for the A (top row) bolts and 65° for the B (bottom row) bolts.
What is the final cylinder head bolt torque?: 64 to 69 N·m (6.5 to 7.0 kg-m, 47 to 51 ft-lb).
What is the spark plug torque specification?: 20 - 29 N·m (2.0 - 3.0 kg-m, 14 - 22 ft-lb).
What should be checked before tightening the cylinder head bolts?: Always use a new cylinder head gasket, make sure the oil pump drive gear can be turned freely by hand, and install washers between the bolts and cylinder head.
How should head bolts be re-torqued during normal maintenance?: First loosen each cylinder head bolt slightly, then tighten to 64 to 69 N·m (6.5 to 7.0 kg-m, 47 to 51 ft-lb). This should be done when the engine is cold.