What is the main bearing cap bolt torque specification?

46 - 52 N·m (4.7 - 5.3 kg-m, 34 - 38 ft-lb), tightened in two or three stages following the numbered sequence shown in the diagram.

What is the crankshaft end play specification and wear limit?

Crankshaft end play is 0.06 - 0.22 mm (0.0024 - 0.0087 in), with a wear limit of 0.50 mm (0.0197 in), measured at the center bearing.

What should be done before tightening the main bearing cap bolts?

Place the bearing cap in proper position by shifting the crankshaft in the axial direction, then tighten in two or three stages.

How do you check the crankshaft after tightening the bearing cap bolts?

After securing the bearing cap bolts, ascertain that the crankshaft turns smoothly by hand.

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Nissan Micra Engine Overhaul - Main Bearing Torque & Crankshaft End Play (EM-27)

Nissan engine overhaul EM-27 crankshaft bearing cap torque and end play measurement page

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Engine-overhaul assembly page: torque main bearing caps to 52 N·m, measure crankshaft end play 0.06-0.22 mm (limit 0.50), and connecting-rod side clearance 0.10-0.37 mm.

AI caption April 2005 · Photo 81 of 412

This is page EM-27 from a Nissan engine overhaul service manual section, covering continued assembly procedures for the bottom end of the engine. It instructs the technician to tighten the main bearing cap bolts to the specified torque of 46-52 N·m (4.7-5.3 kg-m, 34-38 ft-lb), in two or three stages, following a numbered tightening sequence shown in an illustration (bolts 1 through 10). Before tightening, the bearing cap must be positioned properly by shifting the crankshaft axially, and after tightening, the crankshaft should turn smoothly by hand. The page also covers measuring crankshaft free end play at the center bearing using a dial indicator, with a specification of 0.06-0.22 mm (0.0024-0.0087 in) and a wear limit of 0.50 mm (0.0197 in). Connecting rod side clearance (end play) is measured with a feeler gauge, spec 0.10-0.37 mm (0.0039-0.0146 in). Finally, it reminds the technician to verify the cylinder number stamped on each connecting rod and cap during assembly. Illustration reference codes SEM031A, SEM017A, SEM020A, and SEM723A appear with the figures.

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Frequently asked questions

What is the main bearing cap bolt torque specification?: 46 - 52 N·m (4.7 - 5.3 kg-m, 34 - 38 ft-lb), tightened in two or three stages following the numbered sequence shown in the diagram.
What is the crankshaft end play specification and wear limit?: Crankshaft end play is 0.06 - 0.22 mm (0.0024 - 0.0087 in), with a wear limit of 0.50 mm (0.0197 in), measured at the center bearing.
What is the connecting rod side clearance (end play) specification?: 0.10 - 0.37 mm (0.0039 - 0.0146 in).
What should be done before tightening the main bearing cap bolts?: Place the bearing cap in proper position by shifting the crankshaft in the axial direction, then tighten in two or three stages.
How do you check the crankshaft after tightening the bearing cap bolts?: After securing the bearing cap bolts, ascertain that the crankshaft turns smoothly by hand.