Nissan 240SX - Automatic Transmission (Section AT) (2000 year). Instruction

SAT043B

Remove manual shaft from transmission case.

SAT934A

Remove spacer and detent spring from transmission case.

SAT044B

Remove oil seal from transmission case.

IDX

DISASSEMBLY

AT-225

Oil Pump

COMPONENTS

NMAT0112

SAT648AB

SAT649A

DISASSEMBLY

NMAT0113

Loosen bolts in numerical order and remove oil pump cover.

SAT650A

Remove rotor, vane rings and vanes.

Inscribe a mark on back of rotor for identification of fore-
aft direction when reassembling rotor. Then remove rotor.

SAT651A

While pushing on cam ring remove pivot pin.

Be careful not to scratch oil pump housing.

REPAIR FOR COMPONENT PARTS

Oil Pump

AT-226

SAT652A

While holding cam ring and spring lift out cam ring spring.

Be careful not to damage oil pump housing.

Hold cam ring spring to prevent it from jumping.

SAT653A

Remove cam ring and cam ring spring from oil pump housing.

SAT654A

Remove pivot pin from control piston and remove control pis-
ton assembly.

SAT655A

Remove oil seal from oil pump housing.

Be careful not to scratch oil pump housing.

SAT656A

INSPECTION

NMAT0114

Oil Pump Cover, Rotor, Vanes, Control Piston, Side
Seals, Cam Ring and Friction Ring

NMAT0114S01

Check for wear or damage.

IDX

REPAIR FOR COMPONENT PARTS

Oil Pump (Cont’d)

AT-227

SAT657A

SAT658A

Side Clearances

NMAT0114S02

Measure side clearances between end of oil pump housing
and cam ring, rotor, vanes and control piston. Measure in at
least four places along their circumferences. Maximum mea-
sured values should be within specified positions.

Before measurement, check that friction rings, O-ring,
control piston side seals and cam ring spring are
removed.

Standard clearance (Cam ring, rotor, vanes and control
piston):

Refer to SDS, AT-292.

If not within standard clearance, replace oil pump assembly
except oil pump cover assembly.

Seal Ring Clearance

NMAT0114S03

Measure clearance between seal ring and ring groove.

Standard clearance:

0.10 - 0.25 mm (0.0039 - 0.0098 in)

Wear limit:

0.25 mm (0.0098 in)

If not within wear limit, replace oil pump cover assembly.

SAT081EA

ASSEMBLY

NMAT0115

Drive oil seal into oil pump housing.

Apply ATF to outer periphery and lip surface.

SAT654A

Install cam ring in oil pump housing by the following

Install side seal on control piston.

Pay attention to its direction — Black surface goes toward
control piston.

Apply petroleum jelly to side seal.

Install control piston on oil pump.

SAT660A

Install O-ring and friction ring on cam ring.

Apply petroleum jelly to O-ring.

REPAIR FOR COMPONENT PARTS

Oil Pump (Cont’d)

AT-228

SAT661A

Assemble cam ring, cam ring spring and spring seat. Install
spring by pushing it against pump housing.

SAT651A

While pushing on cam ring install pivot pin.

SAT662A

Install rotor, vanes and vane rings.

Pay attention to direction of rotor.

SAT649A

Install oil pump housing and oil pump cover.

Wrap masking tape around splines of oil pump cover assem-
bly to protect seal. Position oil pump cover assembly in oil
pump housing assembly, then remove masking tape.

Tighten bolts in a criss-cross pattern.

SAT663A

Install new seal rings carefully after packing ring grooves with
petroleum jelly. Press rings down into jelly to a close fit.

Seal rings come in two different diameters. Check fit care-
fully in each groove.

Small dia. seal ring:

No mark

Large dia. seal ring:

Yellow mark in area shown by arrow

Do not spread gap of seal ring excessively while install-
ing. It may deform ring.

IDX

REPAIR FOR COMPONENT PARTS

Oil Pump (Cont’d)

AT-229

SAT194B

DISASSEMBLY

NMAT0117

Remove solenoids.

Remove torque converter clutch solenoid valve and side plate
from lower body.

Remove O-ring from solenoid.

SAT667A

Remove line pressure solenoid valve from upper body.

Remove O-ring from solenoid.

SAT043G

Remove 3-unit solenoid assembly from upper body.

Remove O-rings from solenoids.

SAT195B

Disassemble upper and lower bodies.

Place upper body facedown, and remove bolts, reamer bolts
and support plates.

Remove lower body, separator plate as a unit from upper body.

Be careful not to drop pilot filter, orifice check valve,
spring and steel balls.

SAT670A

Place lower body facedown, and remove separator plate.

Remove pilot filter, orifice check valve and orifice check spring.

IDX

REPAIR FOR COMPONENT PARTS

Control Valve Assembly (Cont’d)

AT-231

SAT671A

Check to see that steel balls are properly positioned in upper
body. Then remove them from upper body.

SAT672A

INSPECTION

NMAT0118

Lower and Upper Bodies

NMAT0118S01

Check to see that there are pins and retainer plates in lower
body.

SAT673A

Check to see that there are pins and retainer plates in upper
body.

Be careful not to lose these parts.

SAT674A

Check to make sure that oil circuits are clean and free from
damage.

Check tube brackets and tube connectors for damage.

SAT675A

Separator Plate

NMAT0118S02

Make sure that separator plate is free of damage and not
deformed and oil holes are clean.

REPAIR FOR COMPONENT PARTS

Control Valve Assembly (Cont’d)

AT-232

SAT676A

Pilot Filter

NMAT0118S03

Check to make sure that filter is not clogged or damaged.

SAT149G

Torque Converter Clutch Solenoid Valve

NMAT0118S04

Check that filter is not clogged or damaged.

Measure resistance. Refer to “Component Inspection”, AT-120.

Line Pressure Solenoid Valve

NMAT0118S05

Check that filter is not clogged or damaged.

Measure resistance. Refer to “Component Inspection”, AT-136.

SAT095B

3-Unit Solenoid Assembly (Overrun Clutch Solenoid
Valve and Shift Solenoid Valves A and B)

NMAT0118S06

Measure resistance of each solenoid. Refer to “Component
Inspection”, AT-106, AT-111, AT-116.

SAT196B

A/T Fluid Temperature Sensor

NMAT0118S07

Measure resistance. Refer to “Component Inspection”, AT-125.

SAT671A

ASSEMBLY

NMAT0119

Install upper and lower bodies.

Place oil circuit of upper body face up. Install steel balls in their
proper positions.

IDX

REPAIR FOR COMPONENT PARTS

Control Valve Assembly (Cont’d)

AT-233

SAT681A

Install reamer bolts from bottom of upper body.

SAT682A

Place oil circuit of lower body face up. Install orifice check
spring, orifice check valve and pilot filter.

SAT197B

Install lower separator plate on lower body.

Install and temporarily tighten support plates, A/T fluid tem-
perature sensor and tube brackets.

SAT198B

Temporarily assemble lower and upper bodies, using reamer
bolt as a guide.

Be careful not to dislocate or drop steel balls, orifice
check spring, orifice check valve and pilot filter.

REPAIR FOR COMPONENT PARTS

Control Valve Assembly (Cont’d)

AT-234

SAT199BA

Install and temporarily tighten bolts and tube brackets in their
proper locations.

Bolt length and location:

Bolt symbol

Bolt length mm (in)

70 (2.76)

50 (1.97)

33 (1.30)

27 (1.06)

SAT200B

Install solenoids.

Attach O-ring and install torque converter clutch solenoid valve
and side plates onto lower body.

SAT150G

Attach O-rings and install 3-unit solenoids assembly onto
upper body.

Attach O-ring and install line pressure solenoid valve onto
upper body.

Tighten all bolts.

IDX

REPAIR FOR COMPONENT PARTS

Control Valve Assembly (Cont’d)

AT-235

SAT834A

DISASSEMBLY

NMAT0121

Remove valves at parallel pins.

Do not use a magnetic hand.

SAT822A

Use a wire paper clip to push out parallel pins.

SAT823A

Remove parallel pins while pressing their corresponding plugs
and sleeves.

Remove plug slowly to prevent internal parts from jump-
ing out.

SAT824A

Place mating surface of valve facedown, and remove internal
parts.

If a valve is hard to remove, place valve body facedown
and lightly tap it with a soft hammer.

Be careful not to drop or damage valves and sleeves.

SAT825A

Remove valves at retainer plates.

Pry out retainer plate with wire paper clip.

IDX

REPAIR FOR COMPONENT PARTS

Control Valve Upper Body (Cont’d)

AT-237

SAT826A

Remove retainer plates while holding spring.

SAT827A

Place mating surface of valve facedown, and remove internal
parts.

If a valve is hard to remove, lightly tap valve body with a
soft hammer.

Be careful not to drop or damage valves, sleeves, etc.

SAT828A

4-2 sequence valve and relay valve are located far back in
upper body. If they are hard to remove, carefully push them out
using stiff wire.

Be careful not to scratch sliding surface of valve with wire.

SAT829A

INSPECTION

NMAT0122

Valve Springs

NMAT0122S01

Measure free length and outer diameter of each valve spring.
Also check for damage or deformation.

Inspection standard:

Refer to SDS, AT-289.

Replace valve springs if deformed or fatigued.

Control Valves

NMAT0122S02

Check sliding surfaces of valves, sleeves and plugs.

SAT830A

ASSEMBLY

NMAT0123

Lubricate the control valve body and all valves with ATF. Install
control valves by sliding them carefully into their bores.

Be careful not to scratch or damage valve body.

REPAIR FOR COMPONENT PARTS

Control Valve Upper Body (Cont’d)

AT-238

SAT831A

Wrap a small screwdriver with vinyl tape and use it to insert the
valves into proper position.

SAT832A

Pressure regulator valve

If pressure regulator plug is not centered properly, sleeve can-
not be inserted into bore in upper body. If this happens, use
vinyl tape wrapped screwdriver to center sleeve until it can be
inserted.

Turn sleeve slightly while installing.

SAT833A

Accumulator control plug

Align protrusion of accumulator control sleeve with notch in
plug.

Align parallel pin groove in plug with parallel pin, and install
accumulator control valve.

SAT834A

Install parallel pins and retainer plates.

SAT823A

While pushing plug, install parallel pin.

IDX

REPAIR FOR COMPONENT PARTS

Control Valve Upper Body (Cont’d)

AT-239

SAT835A

4-2 sequence valve and relay valve

Push 4-2 sequence valve and relay valve with wire wrapped in
vinyl tape to prevent scratching valve body. Install parallel pins.

SAT836A

Insert retainer plate while pushing spring.

REPAIR FOR COMPONENT PARTS

Control Valve Upper Body (Cont’d)

AT-240

Nissan 240SX - Automatic Transmission (Section AT) (2000 year). Instruction - part 15