Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Oil Pump

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REMOVAL & INSTALLATION




CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

E-Series Engine

See Figure 1



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Fig. Fig. 1: Oil pump assembly-E-Series engine

  1. Disconnect the negative (-) battery cable. Drain the engine oil.
  2.  
  3. Loosen the alternator lower bolts.
  4.  
  5. Remove the alternator belt and adjusting bar bolt.
  6.  
  7. Move the alternator out of the way and support it safely.
  8.  
  9. Disconnect the oil pressure gauge harness.
  10.  
  11. Remove the oil filter.
  12.  
  13. Remove the pump assembly.
  14.  

To install:
  1. Fill the pump with clean engine oil and rotate it several times or pack the pump housing with petroleum jelly.
  2.  
  3. Install the pump on the engine using a new gasket. Torque the pump mounting bolts to 84-108 inch lbs. (10-14 Nm).
  4.  
  5. Install the oil filter and the oil pressure gauge harness connections.
  6.  
  7. Install the alternator, belt and bracket.
  8.  
  9. Start the engine and check for leaks.
  10.  

CA16DE and CA18DE Engine

See Figure 2



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Fig. Fig. 2: Oil pump assembly-CA16DE and CA18DE engines

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Remove all accessory drive belts and remove the alternator.
  4.  
  5. Remove the timing (cam) belt covers and remove the timing belt.
  6.  
  7. Support the transaxle with a jack and remove the center member from the body. Remove the front crankshaft pulley.
  8.  
  9. Remove the oil pan.
  10.  
  11. Remove the oil pump assembly along with the oil strainer.
  12.  

To install:
  1. If installing a new or rebuilt oil pump, first pack the pump cavity full of petroleum jelly to prevent the pump from cavitating when the engine is started. Apply RTV sealer to the front oil seal end of the pan prior to installation. Install the pump and the strainer as an assembly, torque the mounting bolts to 9-12 ft. lbs. (12-16 Nm).
  2.  

Always use a new O-ring when installing the strainer to the pump body.

  1. Install the oil pan and bolt the engine in place.
  2.  
  3. Install the center member if it was removed.
  4.  
  5. Install the timing belt and covers. Install the crankshaft pulley.
  6.  
  7. Install the alternator and all drive belts. Reconnect the negative (-) battery cable.
  8.  
  9. Start engine and check for leaks.
  10.  

CD17 (Diesel) Engine
  1. Remove the valve timing belt as described later in this section.
  2.  
  3. Drain the oil and remove the oil pan.
  4.  
  5. The oil pump is bolted to the front of the engine block, at the front of the crankshaft. Loosen the mounting bolts and remove the oil pump assembly.
  6.  

Remove the crankshaft key to avoid damage to the oil seal on the pump.

  1. Remove the oil pump rear cover and check gear clearance using a feeler gauge. Body-to-outer gear clearance should be 0.1-0.2mm; outer gear-to-crescent clearance should be 0.2-0.3mm.
  2.  

To install:
  1. Replace the oil seal in the pump by carefully prying it out. Coat the new seal liberally with clean engine oil before installation. Install the crankshaft key.
  2.  
  3. Install the pump to the block, using a new gasket and torquing the bolts to 9-12 ft. lbs. (12-16 Nm). Replace the oil pan, applying sealer to the four corners of the oil pan and use a new oil pan gasket. Install the drain plug and refill the pan with oil.
  4.  
  5. Replace the timing belt as described later. Start the engine and check for leaks.
  6.  

GA16i, GA16DE and SR20DE Engines

See Figures 3 and 4



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Fig. Fig. 3: Oil pump assembly-SR20DE engine shown



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Fig. Fig. 4: Oil pump assembly is located in the front cover-GA16i, GA16DE and SR20DE engines

This is a very complex procedure. Before attempting oil pump service service thoroughly review these procedures, as well as the steps required for cylinder head, timing chain and camshaft service.

The oil pump is located in the front timing cover.

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Drain the engine oil.
  4.  
  5. Remove the drive belts.
  6.  
  7. Remove the cylinder head and oil pan, as outlined in this section.
  8.  
  9. Remove the oil strainer and baffle plate, if so equipped.
  10.  
  11. Remove the front cover assembly.
  12.  
  13. Remove the oil pump retaining bolts and remove the pump gears.
  14.  

To install:
  1. Install the pump gears and torque the cover bolts to 60-84 inch lbs. (7-9 Nm).
  2.  
  3. Remove all traces of gasket material from all gasket mating surfaces.
  4.  
  5. Apply a continuous bead of RVT sealer to the front cover.
  6.  

When using RTV sealant instead of gaskets, make sure the surface you are working on is very clean and dry before applying the sealant, then apply an even bead. Allow the RTV to dry slightly to form a thin skin. The component MUST be tightened before the RTV dries completely. The bolt torque should be checked again after RTV has completely dried.

  1. Within 5 minutes, install the front cover and torque the front cover bolts to 72 inch lbs. (8 Nm).
  2.  
  3. Install the oil baffle and strainer.
  4.  
  5. Install the oil pans and cylinder head as outlined in this section.
  6.  
  7. Install the drive belts.
  8.  
  9. Connect the negative (-) battery cable.
  10.  
  11. Wait 30 minutes before adding engine oil.
  12.  
  13. Refill with engine oil, start the engine and check for leaks.
  14.  

INSPECTION



E-Series Engine


Check the pump body and cover for cracks or excessive wear.
 
Check the pump rotor for excessive wear.
 
Using a feeler gauge, check the rotor tip clearance. The clearance should be less than 0.0047 in. (0.12mm).
 
Using a feeler gauge, check the outer rotor to body clearance. The clearance should be 0.0059-0.0083 in. (0.15-0.21mm).
 
Using a straightedge, check the rotor to straight edge clearance. The clearance should be less than 0.0020 in. (0.05mm).
 
Using a straightedge, check the pump body to straight edge clearance. The clearance should be less than 0.0008 in. (0.02mm).
 

GA16i, GA16DE and SR20DE Engines

See Figures 5 and 6



Click image to see an enlarged view

Fig. Fig. 5: Check clearances: (1) body to outer gear; (2) inner gear to crescent; (3) outer gear to crescent; (4) body to inner gear (5) body to outer gear-GA16DE engine shown



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Fig. Fig. 6: Check clearances: (a) inside diameter; (b) outside diameter; (6) clearance shouldn't exceed 0.0036 in. (0.09mm)-GA16DE engine shown

Oil pump removal is a very complex procedure, involving cylinder head, camshafts, timing chain and front cover. Because of the degree of difficulty, it is advised that if any component of the pump is defective, the entire unit should be rebuilt with new parts.



Check the pump body and cover for cracks or excessive wear.
 
Check the pump rotor for excessive wear.
 
Using a feeler gauge, check the pump to outer gear clearance. The clearance should be 0.0047-0.0078 in. (0.12-0.20mm).
 
Check the inner gear-to-crescent clearance. The clearance should be 0.0085-0.0129 in. (0.22-0.33mm).
 
Check the outer gear-to-crescent clearance. The clearance should be 0.0085-0.0129 in. (0.22-0.33mm).
 
Check the body-to-inner gear clearance. The clearance should be 0.0020-0.0035 in. (0.05-0.09mm).
 
Check the body-to-outer gear clearance. The clearance should be 0.0020-0.0043 in. (0.05-0.11mm).
 
Check the inner gear-to-brazed portion of housing clearance. The clearance should be 0.0018-0.0036 in. (0.05-0.09mm).
 

 
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