Timing Belt: Removal & Installation Nissan Quest I

Removal

1. Raise and support vehicle. Remove covers from below engine. Drain cooling system. Remove right front wheel and engine side cover. Remove accessory drive belts. Remove crankshaft pulley bolt and pulley.
2. Remove upper radiator hose and water inlet hose. Remove A/C compressor idler pulley and bracket. Remove water pump pulley. Remove upper and lower timing belt front covers. (Scheme 10)
3. Temporarily install crankshaft pulley bolt so crankshaft can be rotated. Set cylinder No. 1 at TDC of compression stroke by rotating crankshaft until marks on camshaft sprockets align with marks on timing belt upper rear cover, and mark on crankshaft sprocket aligns with mark on front cover housing. (Scheme 11)
4. Loosen timing belt tensioner nut. Release tension on belt. Remove timing belt. Check timing belt tensioner, spring and timing belt.

Scheme 10

Installation

1. Ensure cylinder No. 1 is at TDC of compression stroke. (Scheme 11) Install tensioner and return spring if removed. If return spring stud was removed, apply thread lock sealant to threads before installing stud. Insert an Allen wrench into hole in tensioner, turn tensioner fully clockwise, and temporarily tighten lock nut.
2. Install timing belt with arrow on timing belt facing front of engine. Align White lines on timing belt with marks on camshaft sprockets and crankshaft sprocket. White lines ensure correct number of teeth exist between timing marks on sprockets.
3. Loosen tensioner lock nut. Using Allen wrench, rotate tensioner by turning Allen wrench clockwise 70-80 degrees. Temporarily tighten lock nut. Rotate crankshaft clockwise at least 2 revolutions.
4. Return cylinder No. 1 to TDC of compression stroke. Using Push/Pull Gauge (J-38387), apply 22-lb. (10.0 kg) pressure to timing belt between right camshaft sprocket and tensioner. Hold tensioner in position with Allen wrench, and loosen tensioner lock nut.
5. Place a.0138" (.351 mm) feeler gauge at tensioner pulley and timing belt, and rotate crankshaft until feeler gauge is centered between tensioner pulley and timing belt. (Scheme 12) Tighten tensioner lock nut to specification. See «TORQUE SPECIFICATIONS»(ref-49048-S31724110732001011500000).
6. Rotate crankshaft to remove feeler gauge. Rotate crankshaft clockwise at least 2 revolutions until cylinder No. 1 is at TDC of compression stroke. Measure timing belt deflection halfway between camshaft sprockets. If deflection is not.51-.59" (13-15 mm), repeat steps 4) and 5). To complete installation, reverse removal procedure.

Scheme 11

Scheme 12

Note. If cylinder head is installed and timing belt is disconnected, DO NOT rotate camshaft or crankshaft; valves will contact pistons, resulting in bent valves.