Mechanics

TIMING CHAIN

1999 Nissan Altima • 4 cylinder FWD Manual • 206,456 miles

Do I need to remove the engine in order to replace the timing chain on a 1999 nissan altima
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Spanky628
April 9, 2011.



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1999 Nissan-Datsun Altima GLE L4-2.4L (KA24DE)
Vehicle Level Engine, Cooling and Exhaust Engine Timing Chain Technical Service Bulletins Engine - New Timing Chain/Front Cover Service Procedure Service Procedure Removal of Upper Timing Chain

Removal of Upper Timing Chain

1. Remove the spark plug wires.

2. Set # 1 piston at TDC on its compression stroke.

3. Remove vacuum hoses, electrical harness, connectors, and harness clamps.

4. Remove the power steering pump, A/C compressor, and alternator belts.

5. Remove the power steering reservoir tank and reposition it for clearance.

6. Install engine support eye bracket at right rear of cylinder head, then support engine.

7. Remove upper right engine mount and bracket.

8. Remove the rocker cover.

9. Remove camshaft sprocket cover.

10. Wipe off the links of the timing chain next to the timing marks on the sprockets. Put paint marks on the timing chain, matching them with the timing marks on the cam sprockets and idler sprocket (see Figure 1).

11. Remove cam sprocket bolts, cam sprockets, upper timing chain guides (if equipped) and upper timing chain.

Removal of Lower Timing Chain

1. Drain coolant by removing the cylinder block drain plug and opening the radiator drain **** (Refer to MA section of the Service Manual).

2. Drain engine oil.

3. Remove the oil pan (Refer to "Removal" under "Oil Pan" in the Service Manual).

4. Remove the power steering pump and position it to the side. Remove the idler pulley and bracket as well.

5. Set # 1 piston at TDC on its compression stroke.

6. Remove the crankshaft pulley.

7. Remove the oil separator.

8. Remove the front cover.

NOTE : Engine may need to be lowered to provide clearance for the chain tensioner housing of the timing cover to clear the frame. Engine height may need to be adjusted when removing the cover.

CAUTION : Be careful not to tear or damage the cylinder head gasket.

9. Remove the following parts: ^ Lower timing chain tensioner (push piston in and insert a suitable pin into the hole).
^ Chain tension arm.
^ Lower timing chain guide.

10. Remove the upper timing chain (refer to "Removal of Upper Timing Chain" in this bulletin).

11. Wipe off the links of the timing chain next to the timing marks on the sprockets. Apply paint marks to the lower timing chain, matching them with the mating marks on the crankshaft sprocket and idler sprocket (see Figure 3).

12. Remove the lower timing chain and sprocket.

Installation of Lower Timing Chain

1. Install the crankshaft sprocket, making sure the mating marks face the front of the engine.

2. Install the idler sprocket and lower timing chain using the mating marks and the paint marks made during the removal process.

CAUTION : Be careful not to tear or damage the cylinder head gasket.

3. Install chain guide and chain tension arm.

4. Install lower chain tensioner and remove the pin securing the piston into the tensioner body.

5. Front cover installation: a. Using a scraper or other suitable tool remove all traces of liquid gasket from the cylinder block, oil separator (pre-98' models) and front cover mating surfaces.

B. Install new crankshaft seal in front cover (see Figure 4).

. Apply a continuous bead of RTV sealant to the breather separator (pre-98' models) and to the front cover (see Figure 5).

NOTE : Use Genuine Nissan RTV silicone sealant P/N 999MP-A7007, Three Bond P/N TB12O7D or equivalent.

NOTE : 1998-1999 models use a paper gasket, not RTV silicone, for the breather separator.

D. Also place RTV sealant on the head gasket surface.
E. Install the front cover to the engine.

CAUTION : Be careful not to tear or damage the cylinder head gasket.

F. Install the oil separator to the front cover.

6. Install oil pan, referring to "Installation" in the "OIL PAN" section of the Service Manual.

7. Install the following parts: a. Crankshaft pulley.
B. A/C compressor and idler pulley bracket.
C. Power steering pump.

Installation of Upper Timing Chain

1. Install the lower timing chain (refer to "Installation of Lower Timing Chain" in this bulletin).

2. Install upper timing chain and sprockets, using the painted reference marks made during removal.

3. Install chain tensioner. Remove the pin holding the piston in the bore of the tensioner.

NOTE : The two chain guides for the upper timing chain have been deleted. Discard the two chain guides and their bolts during any service to the timing chain.

4. Install camshaft sprocket cover: a. Use a scraper to remove all traces of liquid gasket from the mating surfaces of the engine block and camshaft sprocket cover.

B. Apply a continuous bead of RTV sealant to the cover as shown in Figure 6.

NOTE : Use Genuine Nissan RTV silicone sealant P/N 999MP-A7007, Three Bond P/N TB1 207D or equivalent.

C. Also place RTV sealant on the head gasket surface.

CAUTION : Be careful not to tear or damage the cylinder head gasket.

CAUTION : Be careful upper timing chain does not slip or jump when installing the camshaft sprocket cover.

D. Install camshaft sprocket cover.

5. Install rubber plugs into cylinder head after applying RTV sealant (see Figure 7).

6. Install rocker cover, tightening the bolts as shown in Figure 8.

7. Install upper right engine mount and bracket.

8. Install power steering fluid reservoir tank.

9. Install alternator support bracket and alternator.

10. Install alternator, power steering and A/C compressor drive belts.

11. Install vacuum hoses, electrical harnesses and connectors.

12. Support lower timing chain by using a suitable tool as shown in Figure 2 to avoid chain tensioner spring from coming out.

NOTE : This step is only to be applied when the lower cover is not being removed.

13. Remove the idler sprocket.

Saturntech9
Apr 9, 2011.