Below you'll find the tightening torques for the Nissan NV250 in both Nm and ft/lbs. The first table contains the most-used torque settings. The second table contains all torque spec values I could find.

Most-Used Torque Settings for NV250

Part	Description	Torque (Nm)	Torque (ft/lbs)	Remarks	Source
Wheel lug nuts	110	81	Steel
Wheel lug nuts	110	81	Alloy
Engine oil drain plug	20	15	Engine K9K, K4M
Engine oil drain plug	25	18	Engine K7M
Spark plugs	28	21	Engine K7M, K4M

To make sure these are the correct tightening torque values, you can use the data below to verify this is the right model.

All Torque Settings in Tables

General torque settings

Nut	Torque (Nm)	Torque (ft/lbs)	Remarks	Source
Wheel lug nuts	110	81	Steel
Wheel lug nuts	110	81	Alloy
Sump bolts on the cylinder block	14	10
Sump bolts on the gear box	44	32
Engine oil drain plug	20	15	Engine K9K, K4M
Engine oil drain plug	25	18	Engine K7M
Oil separator bolts	12	9	Engine K4M
Oil pressure switch	32	24	Engine K4M, K7M
Cylinder head bolts (Initial torque)	20	15	Engine K9K, K4M, K7M
Cylinder head bolts	25	18	Engine K9K
Spark plugs	28	21	Engine K7M, K4M
Intake manifold bolts and nuts	28	21	Engine K7M
Intake manifold strut bolt	21	15	Engine K7M
Intake manifold strut nut	21	15	Engine K7M
Exhaust manifold studs	9	7	Engine K4M, K7M
Exhaust manifold nuts	26	19	Engine K9K, K4M
Exhaust manifold nuts	25	18	Engine K7M
Exhaust flange bolts	22	16	Engine K4M
Exhaust flange bolts	21	15	Engine K7M
Bolt of the alternator tensioner	21	15	Engine K7M
Alternator bolts	25	18	Engine K9K, K4M
Inlet camshaft sprocket nut	30	22	Engine K4M
Exhaust camshaft sprocket nut	30	22	Engine K4M
Bolts 1 to 7 of the coolant pump	10	7	Engine K4M, K7M
Bolt 8 of the coolant pump	25	18	Engine K4M, K7M
Coolant pump bolts	10	7	Engine K9K