Make sure that there is no foreign material in the oil filter (1) and check it for blockages.
Check the filter for damage.
If any defects are found, replace the oil filter, plug and washer with new ones as a set.
Camshaft runout
1. Place the prisms on the marking plate and place the shaft on the prisms with journals No.2 and 5.
Caution: Do not place neck #1 on the prism (closest to the shaft sprocket), since it has a different diameter from the others.
2. Install the vertical leg of the dial indicator on the neck No.3.
3. Rotate the shaft by hand on one side to determine the runout of the camshaft (amplitude of the arrow oscillation).
4. If the measured value does not meet the specifications, replace the camshaft with a new one.
Camshaft cam height
1. Use a micrometer to measure the height of the camshaft cam.
2. If the measured value does not meet the specifications, replace the camshaft with a new one.
Oil clearance on the camshaft journal
Camshaft journal diameter
Measure the outside diameter of the crankshaft journal using a micrometer (A).
Camshaft bed diameter
Tighten the camshaft bracket bolts to the specified torque.
Using a bore gauge (A), measure the diameter (B) of the camshaft bed.
Oil clearance on the camshaft journal
(Oil clearance) = (Bed diameter) - (Neck diameter)
If the calculated runout exceeds the specifications, replace the camshaft or cylinder head, or both.
Note: The camshaft bracket is not replaced separately, as it is bored together with the cylinder head assembly. Replace the cylinder head as an assembly.
Checking the axial clearance of the camshaft
Place the dial indicator leg on the front end of the camshaft parallel to its axis. Measure the axial clearance by moving the shaft back and forth.
Check if the following dimensions are within the acceptable range:
Span "A" of the kanzaki bed No.1 of the cylinder head. Standard work: 4.000-4.030 mm.
Size "e" of the flange of the camshaft. Standard value: 3.877-3.925 mm.
Taking into account the given technical conditions, a decision is made to replace the camshaft and/or cylinder head.
Camshaft Sprocket Runout
1. Place the prisms on the marking plate and place the shaft on the prisms with journals No.2 and 5.
Caution: Do not place neck #1 on the prism (closest to the shaft sprocket), since it has a different diameter from the others.
2. Using a dial indicator (A), measure the axial runout of the sprocket (arrow amplitude).
If the measured value does not meet the specifications, replace the sprocket.
Valve lifter
Check the tappet surfaces for cracks and wear.
If such defects are present, replace the tappet.
Clearance between the pusher and the walls of the socket
Outside diameter of the push rod
Measure the outside diameter of the valve tappets with a micrometer (A).
Pusher socket diameter
Using a bore gauge (A), measure the diameter of the tappet socket.
[For more information, see the website: www.NissanBook.ru]
Clearance between the pusher and the socket wall
(Gap) = (Socket diameter) - (Outside diameter of the push rod)
If the calculated clearance value does not correspond to the specifications, then, based on the measured values of the tappet and socket diameter, replace the tappet and/or the cylinder head.