What size wrench do i need to remove head bolts on a 2005 nissan sentra 1.8 liter

left side exhost manifold looks like a sparkplug 7/8 wrench

Bleed out the air.

remove the carpet oveer the rear wheel well in the trunck there you will find three nuts or bolts remove theese and the strut is free from the top.

CYLINDER HEAD REMOVAL

2.5L Engines

1. Before servicing the vehicle, refer to the Precautions Section.
   
2. Drain cooling system and engine oil.
   
3. Relieve the fuel system pressure.
   
4. Remove or disconnect the following:
   
   • Negative battery cable
     
   • Upper radiator hose and heater hose
     
   • Right side fuse/relay box and move aside
     
   • Engine undercover
     
   • Resonator and air cleaner case
     
   • Engine top cover
     
   • All electrical and vacuum lines at the head
     
   • Fuse hose quick connector at fuel tube side
     
   • Engine harness and power steering hose bracket
     
   • Timing chain
     
   • Drive belt tensioner
     
   • Camshafts
     
   • Spark plugs
     
   • Exhaust manifold
     
5. Support the engine from above and below with a suitable jack and hoist.
   
6. Remove or disconnect the following:
   
   • Power steering pump and reservoir and wire aside
     
   • Auxiliary drive belts
     
   • A/C compressor and wire aside
     
   • Upper sway bar links
     
   • Front and rear engine mount through bolts
     
   • Lower ball joints
     
   • 2 steering gear housing mounting bolts
     
   • Front suspension member bolts and front suspension member
     
7. Loosen the cylinder head bolts in the sequence shown and remove the cylinder head.
   

Removing the front suspension member—Altima


Cylinder head bolt removal sequence—2.5L engine–Altima and Sentra


Cylinder head bolt tightening sequence—2.5L engine–Altima and Sentra

To install:

1. Clean the gasket surfaces.
   
2. Using new head gaskets, install the cylinder heads.
   NOTE If possible, replacement of the head bolts is suggested.
   
   
3. If replacement of the head bolts is not possible, perform the following bolt measurement:
   
   • Measure the diameter of the head bolt 0.43 in. (11mm) from the bottom of the bolt.
     
   • Measure the diameter of the head bolt 2.17 in. (55mm) from the bottom of the bolt.
     
   • Whenever the size difference between the 2 measurements exceeds 0.0091 in. (0.23mm) the head bolts must be replaced.
     
4. Apply clean engine oil to the bolt threads and seating surfaces and tighten the cylinder head bolts in sequence as follows:
   
   • Step 1: 72 ft. lbs. (98 Nm).
     
   • Step 2: Loosen all the bolts completely.
     
   • Step 2: 29 ft. lbs. (33 Nm).
     
   • Step 4: Plus 75–80 degrees clockwise.
     
   • Step 5: Plus 75–80 degrees clockwise.
     
5. Install the front suspension member and tighten the bolts to the specifications shown in the illustration.
   
6. Install or connect the following:
   
   • 2 steering gear housing mounting bolts
     
   • Lower ball joints
     
   • Front and rear engine mount through bolts
     
   • Upper sway bar links
     
   • A/C compressor
     
   • Auxiliary drive belts
     
   • Power steering pump and reservoir
     
   • Exhaust manifold
     
   • Spark plugs
     
   • Camshafts
     
   • Drive belt tensioner
     
   • Timing chain
     
   • Engine harness and power steering hose bracket
     
   • Fuse hose quick connector at fuel tube side
     
   • All electrical and vacuum lines at the head
     
   • Engine top cover
     
   • Resonator and air cleaner case
     
   • Engine undercover
     
   • Right side fuse/relay box and move aside
     
   • Upper radiator hose and heater hose
     
   • Negative battery cable
     
7. Fill the cooling system and engine oil
   
8. Start the vehicle, check for leaks and repair if necessary.
   

1. For 1.8L engines, tighten the bolts in sequence, as follows:
   1. Step 1: Bolts 1-10 to 22 ft. lbs. (29 Nm).
   2. Step 2: Bolts 1-10 to 43 ft. lbs. (59 Nm).
   3. Step 3: Loosen bolts 1-10 completely.
   4. Step 4: Bolts 1-10 to 22 ft. lbs. (29 Nm).
   5. Step 5: Bolts 1-10 plus 50-55 degrees.
   6. Step 5: Bolts 11-14 to 74 inch lbs. (8 Nm).
      
      Fig. Cylinder head torque sequence-1.8L engine
      
      
      Fig. Tighten the valve cover bolts in sequence-1.6L and 1.8L engines
      

are you saying will not thread back into the hole.If so,get a tap for the bolt size and retap the hole and reinstall with a new bolt.Take your time starting the bolt.

this is a 6 step procedure first tighten to 37 ft pounds all bolts step 2 turn all bolts 60 degrees step 3 loosen all bolts step 4 retighten to 30 ft pounds step 5 turn bolts 75 degrees and step 6 turn all bolt another 75 degrees

heinrichkemp: The engine in your car is a GA16i
I venture you are asking about the head bolts when you refer to torque settings. The head bolts used on this motor are torque to yield (streach bolts) If you are reusing them, you need to check them to insure they are not stretched beyond limits.
The way you measure the bolt is with a micrometer.
Measuring close to the end where the bolt starts to thread in, about 10-12 threads up, take a reading. Now, go to the other end of the bolt where the threads end and measure about 10 threads in.
There should not be more than a .009 inch difference (.228mm). If there is, discard the bold and get a new one.

You must use a sequence to tighten the bolts, below is the sequence.
11
13 9 3 1 6 8

14 7 5 2 4 10
12 15

torque 11,12,13,14 & 15 to 8.3 Nm (6.1 ft lbs)
Torque the main head bolts by the numbered sequence to
29Nm (22 ft lbs) first pull
64Nm (47 ft lbs) second pull
Loosten all the bolts completely
Tighten the to 29Nm (22 ft lbs) first pull
Tighten bolt # 1 clockwise 85 degrees
Tighten bolts #2- 10 65 degrees
Nissan noted that if you do not have a torque angel meter, you can use a regular torque wrench and torque all the bolts to 69Nm (51 ft lbs)
The valves on this engine have hydraulic lifters, consequently require no adjustment.

you didnt say what engine so here you go