Cylinder head removal on 2005 nissan altima 2.5 engine would like to know how to remove the camshaft to remove the head bolts

CAMSHAFT REMOVAL



2.5L Engine

Before servicing the vehicle, refer to the Precautions Section.



Relieve the fuel system pressure.



Drain coolant from the engine and radiator.



Remove or disconnect the following:





Negative battery cable



Engine undercover



Right front wheel



Valve cover



Drive belt



Coolant reservoir



Variable timing control solenoid connector



Camshaft position sensor



Intake valve timing control cover in reverse of the tightening sequence



Set the No. 1 piston at Top Dead Center (TDC) on its compression stroke




Check that the mating marks on the camshaft sprockets are lined up with the Yellow links on the timing chain. If not, rotate the crankshaft one revolution until the links line up.



Remove the timing chain guide out between the camshaft sprockets through the front cover.



Push in the plunger on the timing chain tensioner, then insert a pin to hold the tensioner retracted.



Remove the timing chain tensioner .



While holding the flat of the camshaft with an open end wrench, loosen and remove the camshaft sprockets.



Loosen the camshaft brackets in the order shown .



Remove the camshafts.



Remove the valve lifters.





Camshaft bearing cap removal sequence—2.5L engines






Identifying camshaft bearing cap installation marks—2.5L engines






Camshaft bearing cap tightening sequence—2.5L engines






Camshaft sprocket alignment marks—2.5L engines






Intake valve timing cover tightening sequence—2.5L engines



To install:





NOTE


When installing the valve components, apply a coat of clean engine oil to the component.






Install or connect the following:





Lifters into the lifter bores from which they were removed



Valve shims to the lifters from which they came




Install the camshafts so the dowel pin on the intake camshaft is placed at the three o’clock position and the exhaust camshaft pin is placed at the twelve o’clock position.



Install the camshaft caps with the identifying marks placed in the correct position as shown.



Place a bead of sealant of the No. 1 bearing cap bottom edge.



Place a bead of sealant on the back side of the front cover where the No. 1 bearing cap lines up.



Apply sealant to the bolt hole on the front cover.



Install the No. 1 bearing cap so the sealant joints line up.



Tighten the camshaft bearing caps bolts in the proper sequence as follows:





Step 1 bolts 9–11: 17 inch lbs. (2 Nm).



Step 2 bolts 1–8: 17 inch lbs. (2 Nm).



Step 3 bolts 1–11: 52 inch lbs. (6 Nm).



Step 4 bolts 1–11: 80–104 inch lbs. (9–12 Nm).




Install the camshaft sprockets so the mating marks are aligned as shown.



Install or connect the following:





Timing chain tensioner and remove the pin



Intake valve timing control cover and tighten the bolts in the sequence shown.



Check and adjust the valve clearance as necessary.



Timing chain guide between the camshaft sprockets through the front cover



Camshaft position sensor



Variable timing control solenoid connector



Coolant reservoir



Drive belt



Valve cover



Right front wheel



Negative battery cable



Engine undercover




Fill the cooling system.



Start the vehicle, check for leaks and repair if necessary.

CAMSHAFT REMOVAL

2.5L Engine
Before servicing the vehicle, refer to the Precautions Section.

Relieve the fuel system pressure.

Drain coolant from the engine and radiator.

Remove or disconnect the following:

Negative battery cable

Engine undercover

Right front wheel

Valve cover

Drive belt

Coolant reservoir

Variable timing control solenoid connector

Camshaft position sensor

Intake valve timing control cover in reverse of the tightening sequence

Set the No. 1 piston at Top Dead Center (TDC) on its compression stroke

Check that the mating marks on the camshaft sprockets are lined up with the Yellow links on the timing chain. If not, rotate the crankshaft one revolution until the links line up.

Remove the timing chain guide out between the camshaft sprockets through the front cover.

Push in the plunger on the timing chain tensioner, then insert a pin to hold the tensioner retracted.

Remove the timing chain tensioner .

While holding the flat of the camshaft with an open end wrench, loosen and remove the camshaft sprockets.

Loosen the camshaft brackets in the order shown .

Remove the camshafts.

Remove the valve lifters.


Camshaft bearing cap removal sequence—2.5L engines


Identifying camshaft bearing cap installation marks—2.5L engines


Camshaft bearing cap tightening sequence—2.5L engines


Camshaft sprocket alignment marks—2.5L engines


Intake valve timing cover tightening sequence—2.5L engines

To install:
NOTE When installing the valve components, apply a coat of clean engine oil to the component.


Install or connect the following:

Lifters into the lifter bores from which they were removed

Valve shims to the lifters from which they came

Install the camshafts so the dowel pin on the intake camshaft is placed at the three o’clock position and the exhaust camshaft pin is placed at the twelve o’clock position.

Install the camshaft caps with the identifying marks placed in the correct position as shown.

Place a bead of sealant of the No. 1 bearing cap bottom edge.

Place a bead of sealant on the back side of the front cover where the No. 1 bearing cap lines up.

Apply sealant to the bolt hole on the front cover.

Install the No. 1 bearing cap so the sealant joints line up.

Tighten the camshaft bearing caps bolts in the proper sequence as follows:

Step 1 bolts 9–11: 17 inch lbs. (2 Nm).

Step 2 bolts 1–8: 17 inch lbs. (2 Nm).

Step 3 bolts 1–11: 52 inch lbs. (6 Nm).

Step 4 bolts 1–11: 80–104 inch lbs. (9–12 Nm).

Install the camshaft sprockets so the mating marks are aligned as shown.

Install or connect the following:

Timing chain tensioner and remove the pin

Intake valve timing control cover and tighten the bolts in the sequence shown.

Check and adjust the valve clearance as necessary.

Timing chain guide between the camshaft sprockets through the front cover

Camshaft position sensor

Variable timing control solenoid connector

Coolant reservoir

Drive belt

Valve cover

Right front wheel

Negative battery cable

Engine undercover

Fill the cooling system.

Start the vehicle, check for leaks and repair if necessary.