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Thread Head bolt torque and sequence
Read the threads, but it states:
According to my manual the removal and the replacement sequence are different. Removal (looking from the cam sprockets )
headbolt 1-3-9-5-7 are on the left and 2-4-10-9-8 are on the right. Remove in that progression.
Instillation 9-5-1-3-7 are on the left and 10-6-2-4-8 are on the right tighten in that order.
Tighten to 25Nm or 18 ft/lb. and retighten the cyl hd blt 70 deg plus 70 deg plus 50 deg using the angular torque guage KM-470-B.
Hope this helps. Might help to make a sketch and label the 5 headbolts on each side.
The left head is located on the left side of the motor, when you're sitting in the vehicle. When you're looking from the engine compartment directly at the motor, the left head/side would be just the opposite. facing the motor with the belts looking at you, the left head would be to your right side. The number one piston/cylinder is the head wher the front of the head is closest to you when standing and looking at the belts.
Cylinder head cracks are rarely visible, can usually only be found with testing equipment found in machine shops. If the head comes with at least a minimal warranty, you can have the head tested as soon as you recieve it for your own peace of mind. Head testing is generallly cheaper than having to replace the head later.
Timing marks on the 3L motor are: (looking from the front of the engine) right side camshaft sprocket (1 dot on sprocket and the cylinder head); left side camshaft sprocket (1 dot on sprocket and clyinder head); crankshaft sprocket (arrow on the block and an inverted arrow on the face of the sprocket) and of course the timing belt cover
25. Cylinder Head W/intake Manifold
· Clean up cylinder head lower surface and cylinder
body upper surface.
· Install cylinder head as softly.
· Apply engine oil to screw and seat of cylinder
· Tighten cylinder head bolts in following sequence
36 Lbs /ft
60° - 1/3 a of a turn
60° -- same
hi.im a mechanic from the philippines.the torque of all your cylinder head for your nissan sentra 1997 is 60 nm.apply 30 nm of torque first on all the cylinderhead bolts then torque it agian directly to 60 nm. i also drive and repair nissan cars.