This is page number 4 for the repair " How to replace the timing chain in 1990-1996 4 cylinder fuel injected Nissan pick-up".

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 Loosen the camshaft sprocket bolt, we used a special socket on the crankshaft to keep the engine from turning, but you can insert a small pry-bar between the edge of the cylinder head and one of the holes in the camshaft sprocket to keep it from turning as you loosen the bolt.

Don't remove the bolt yet.

 

 

 

 

 Scrape the old sylicone gasket from the engine block, the edge of the oil pan and the timing cover.
















 Remove the timing chain tensioner.

 

  

 

 

 

 Remove the timing chain tensioner guide, followed by the camshaft sprocket and the timing chain, remove the opposite timing chain guide also.

 

 

 

 

  

 Remove the crankshaft sprocket, install the new one provided with the timing component set.











 Install the camshaft sprocket, tighten the bolt to 100 ft-lbs, as you can see on the picture, the new timing chain has two chain links of different color, one goes aligned with the dot on the camshaft sprocket, the second one is aligned with the crankshaft sprocket, this allows the installer to maintain the correct timing.

NOTE: Make sure that you lubricate the new chain with engine oil to avoid damage to the chain and sprockets from dry star-up. 









Before you install the new timing chain tensioner, sumerge it in a small container filled with engine oil.

 Install the new timing chain tensioner, make sure the bolts are tightened properly.

Remove the pin from the tensioner to allow it to operate.














 Remove the old timing cover oil seal ( front crankshaft oil seal ).














 Using a wooden block, install the new timing cover seal on the timing cover, once installed, lubricate the inside lip of the seal with petrolleum jelly or engine oil.














 Install the new oil seals on the front of the engine block.

 

 





 

 This engine doesn't require a timing cover gasket, instead the manufacturer uses gray silicone to provide a seal between the engine block and the timing cover, apply a generous amount of silicone to the timing cover as shown on the picture, apply a similar amount to the edge of the oil pan and cylinder head that make contact with the timing cover, you need to be fairly fast in installing the timing cover once you apply the silicone, otherwise it will dry-up and it won't seal properly.









 We chose to install a new oil pump in this engine, weather it is a new pump or the old oil pump, it needs to be primed by adding angine oil as shown in the picture and turning the shaft till oil comes out on the other oil passage, make sure that you install the oil pump shaft before installing the pump, also, make sure that you install a new gasket.

IMPORTANT: It may take you a couple attempts, but the oil pump and the distributor need to be installed at the same time, this is to make sure that the ignition rotor is pointing to the number one cylinder, the way the oil pump drive shaft is designed, it only allows one way to fit the distributor shaft, keeping an accurate alignment is crucial, otherwise you won't be able to set the correct ignition timing.








 Install all the components in the reverse order you took them off, make sure that all the bolts are tight as you install each item, install a new valve cover gasket, on the edge of the seals apply a light coat of silicone as shown in the picture to avoid any oil leaks.








 Once you are done installing all the accessories, fill the cooling system with 50/50 engine coolant, make sure that the engine oil level is full and start the engine, watch for any leaks, allow it to run as you keep a close eye on the engine temperature, there is a possibility of air pockets in the cooling system that may interfere with the thermostat operation, if necesary, turn the engine off if you see the temperature gauge go past half, open the radiator cap slowly and add more coolant if needed, repeat this procedure till the engine temperature remains normal.

Next, set the correct timing to the specifications shown under the hood, the timing light needs to be connected to the number one spark plug wire, connect the positive and negative power source to the battery. The distributor rotor in this engine turns counterclockwise, meaning that to advance the ignition timing you need to turn the distributor clockwise and to retard the ignition timing you need to turn it counterclockwise.

Once you set the correct ignition timing with the engine operating at normal temperature, make sure that the two bolts that secure the distributor in place are tight.

If you did everything correctly the truck should run fine without any noises or oil leaks.