Timing Chain Nissan Truck Page 4
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How To: 

Replace the Timing Chain in a 1990-1996 Nissan Pick-Up with a 4 Cylinder Fuel Injected Engine
Page 4 of 4

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Loosen camshaft sprocket bolt
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 old silicone gasket engine block, edge of oil pan and timing cover.
Scrape the old silicone gasket from the engine block, the edge 
of the oil pan and the timing cover.




Remove timing chain tensioner
Remove the timing chain tensioner.



  
Remove timing chain tensioner guide
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 camshaft sprocket
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, submerge 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 old timing cover oil seal, front crankshaft oil seal
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 petroleum 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 
engine 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 necessary, turn the
engine off if y
ou 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.