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What is the loosening and torqe sequince of cylinder head bolts on a 1990 honda prelude 2.1 liter motor?

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Start from middle of head criss crossing outward. !st step 22ft/lbs and second step 49 ft/lbs.

Posted on Dec 31, 2010

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What lbs do I tighten the head bolts to on my 1990 Honda prelude SI 2.1L DOHC and in what order do I tighten them?


Go inside the local Autozone and ask for the cylinder head torque specs. They will look it up and print it out for you. It will contain the torque specifications as well as the sequences. Happy torquing.

Mar 01, 2015 | 1990 Honda Prelude

1 Answer

What is the head bolt torqe setting1990 geo prizim 1.6 liter 16 valve


1/ step - 25nm, 2/ step 60nm. Be sure to do it in 2 steps.. It is a Toyota Corolla/Sprinter engine.

Jun 01, 2014 | 1990 Geo Prizm

1 Answer

Diy headgaskit leaking


which engine,there are many , state displacement and cylinder count.
DID YOU OVERHEAT IT?
this is covered in the FSM, get one.
or use Alldata.com
lots of steps.
well over 100..... counting adjustements, etc.....
i guess you never done a head job before?

do not just replace it. (gasket) check for head AND engine
deck warpage. ( a $2 tool , )
here is my wild guess,

Except Accord V-6 The cylinder head temperature must be below 100F (38C); allow the engine to cool several hours if the car has been recently driven. Turn the crankshaft pulley so that the number one piston is at Top Dead Center (TDC) of the compression stroke.
  1. Disconnect the battery ground cable.
  2. Drain the cooling system.
  3. Remove the air cleaner and intake duct assembly.
  4. Label and remove the brake booster, PCV and charcoal canister vacuum hoses from the intake manifold.
  5. Remove the engine ground cable from the cylinder head or valve cover.
  6. Relieve the fuel pressure using the proper procedure. Disconnect the fuel lines.
  7. Disconnect the accelerator cable at the throttle body or carburetor. On automatic transaxle vehicles, also disconnect the throttle control cable.
  8. Disconnect and tag all the wire harnesses and vacuum hoses from the cylinder head, intake manifold and throttle body/carburetor. Disconnect the spark plug wires, then position them aside.
  9. Disconnect the upper radiator hose. Remove the heater hoses from the cylinder head.
  10. If equipped, remove the cruise control actuator. Do not disconnect the cable; move the actuator out of the work area with the cable attached.
  11. Remove accessory drive belts.
  12. Disconnect the inlet hose from the power steering pump and plug the hose immediately to prevent fluid leakage. Remove the power steering pump from the cylinder head and position it aside.
When the power steering hose is disconnected, the fluid will flow out. Cover the alternator with a shop towel to prevent the fluid from leaking into it.
  1. If the alternator is mounted to the cylinder head, remove it.
  2. Remove the power steering and alternator brackets if they are mounted on the cylinder head.
  3. Remove the distributor. Be sure to scribe a line relating the position of the distributor to the engine for easy installation.
  4. If equipped, remove the cylinder sensor next to the distributor.
  5. Remove the valve cover.
  6. Remove the timing belt.
Do not crimp or bend the timing belt.
  1. Remove the exhaust header pipe nuts and the header pipe bracket (if equipped). Pull the pipe away from the exhaust manifold.
  2. If equipped, remove the EGR crossover and air suction pipes.
  3. On Accords through 1989 and Preludes through 1991, the cylinder head can be removed with the intake and exhaust manifolds either still attached or removed. On other models, the manifolds should be removed first.
  4. On some engines, it will be necessary to remove the camshaft holders, camshafts and rocker arms to access the cylinder head bolts. If so, refer to the proper procedures in this section.
  5. Remove the cylinder head bolts in sequence (take notice of any bolt holes occupied by longer bolts). Failure to follow this procedure may cause the head to warp.
    1. On 1984-89 Accords and 1984-91 Preludes, work from the ends toward the center. Loosen each bolt about 1/2 turn each time and make several passes to release the tension evenly.
    2. On 1990-95 Accords and 1992-95 Preludes, follow the loosening sequence shown in the illustrations. Loosen each bolt about 1/3 turn each time. Repeat the sequence until all bolts are loosened.
Remove the cylinder head. The head may resist removal, even with the bolts out. Tap the edge of the head with a plastic or rubber mallet; lift the head straight up to remove it.
Remove the cylinder head gasket and clean the mating surfaces.
(do not use wire brush or metal scrapers on alum, heads)
use a plastic scraper.
then check for warping, (ask)

If applicable, remove the intake and exhaust manifolds from the cylinder head. (lol, is listed last, gotta love non FSM real online data)


i post this to dissuade you, its not complete.
there are many factors,checks and issues, TTY, and others.....
graphics missing above, head sequence rules. on and off !

if the head was overheated, you need to get it pressure tested
and warp checked.
the top to reasons for new gaskets , put on to fail in first 10k milles
is , not warp checked, pressure checked)
or 2: surfaces were not good. (might need to be milled a tad)
3: not using new head bolts, some are TTY and if not ,should not be used 3 times.

Dec 26, 2013 | 1993 Honda Accord

1 Answer

I NEED replace head gaske


Hi there:Removal and InstallationExcept Accord V-6


The cylinder head temperature must be below 100 degrees F (38 degrees C); allow the engine to cool several hours if the car has been recently driven. Turn the crankshaft pulley so that the number one piston is at Top Dead Center (TDC) of the compression stroke.

  1. Disconnect the battery ground cable.
  2. Drain the cooling system.
  3. Remove the air cleaner and intake duct assembly.
  4. Label and remove the brake booster, PCV and charcoal canister vacuum hoses from the intake manifold.
  5. Remove the engine ground cable from the cylinder head or valve cover.
  6. Relieve the fuel pressure using the proper procedure. Disconnect the fuel lines.
  7. Disconnect the accelerator cable at the throttle body or carburetor. On automatic transaxle vehicles, also disconnect the throttle control cable.
  8. Disconnect and tag all the wire harnesses and vacuum hoses from the cylinder head, intake manifold and throttle body/carburetor. Disconnect the spark plug wires, then position them aside.
  9. Disconnect the upper radiator hose. Remove the heater hoses from the cylinder head.
  10. If equipped, remove the cruise control actuator. Do not disconnect the cable; move the actuator out of the work area with the cable attached.
  11. Remove accessory drive belts.
  12. Disconnect the inlet hose from the power steering pump and plug the hose immediately to prevent fluid leakage. Remove the power steering pump from the cylinder head and position it aside.

When the power steering hose is disconnected, the fluid will flow out. Cover the alternator with a shop towel to prevent the fluid from leaking into it.

  1. If the alternator is mounted to the cylinder head, remove it.
  2. Remove the power steering and alternator brackets if they are mounted on the cylinder head.
  3. Remove the distributor. Be sure to scribe a line relating the position of the distributor to the engine for easy installation.
  4. If equipped, remove the cylinder sensor next to the distributor.
  5. Remove the valve cover.
  6. Remove the timing belt.

Do not crimp or bend the timing belt.

  1. Remove the exhaust header pipe nuts and the header pipe bracket (if equipped). Pull the pipe away from the exhaust manifold.
  2. If equipped, remove the EGR crossover and air suction pipes.
  3. On Accords through 1989 and Preludes through 1991, the cylinder head can be removed with the intake and exhaust manifolds either still attached or removed. On other models, the manifolds should be removed first.
  4. On some engines, it will be necessary to remove the camshaft holders, camshafts and rocker arms to access the cylinder head bolts. If so, refer to the proper procedures in this section.
  5. Remove the cylinder head bolts in sequence (take notice of any bolt holes occupied by longer bolts). Failure to follow this procedure may cause the head to warp.
    1. On 1984-89 Accords and 1984-91 Preludes, work from the ends toward the center. Loosen each bolt about 1 / 2 turn each time and make several passes to release the tension evenly.
    2. On 1990-95 Accords and 1992-95 Preludes, follow the loosening sequence shown in the illustrations. Loosen each bolt about 1/3 turn each time. Repeat the sequence until all bolts are loosened.

3_5_2012_9_19_50_pm.gif
Fig. 1: Bolt loosening sequence on 1990-93 Accords and 1992-95 Preludes with 2.2L engines

24. Remove the cylinder head. The head may resist removal, even with the bolts out. Tap the edge of the head with a plastic or rubber mallet; lift the head straight up to remove it.
  1. Remove the cylinder head gasket and clean the mating surfaces.
  1. If applicable, remove the intake and exhaust manifolds from the cylinder head.

To install:
  1. Install a new head gasket on the engine, making certain it is positioned correctly. The cylinder head dowel pins and the oil jet must be in place. Refer to the illustrations if necessary.
  2. Install the head. Lower it straight down onto the block, aligning it correctly.
  3. Apply clean engine oil to the bolt threads and the contact face of the bolt head. Install the head bolts finger-tight.
  4. On all models except 1988-89 DOHC Prelude and 1992-95 Preludes with 2.3L and VTEC engines, tighten the head bolts following sequence A. On 1988-89 DOHC Preludes, use sequence B. Use sequence C on 1992-95 Preludes with 2.3L and VTEC engines.
    1. On 1984-89 Accords and 1984-91 Preludes, tighten the bolts in two passes. The first pass should bring the bolts to about 22 ft. lbs. (30 Nm). On the second pass, tighten the bolts to their final torque of 49 ft. lbs. (68 Nm).
    2. On 1990-93 Accords, tighten the bolts to 29 ft. lbs. (40 Nm) on the first pass, 51 ft. lbs. (70 Nm) on the second pass, then tighten the bolts to their final torque of 78 ft. lbs. (108 Nm).
    3. On 1994-95 Accords and 1992-95 Preludes, the bolts are also tightened in three passes. Tighten the bolts to 29 ft. lbs. (40 Nm) on the first pass, 51 ft. lbs. (70 Nm) on the second pass, then tighten the bolts to their final torque of 72 ft. lbs. (100 Nm).
    .
3_5_2012_9_24_01_pm.jpg
Fig. Cylinder head bolt torque sequence B

3_5_2012_9_24_44_pm.jpg
Fig. Cylinder head bolt torque sequence B

3_5_2012_9_25_06_pm.jpg
Fig. Cylinder head bolt torque sequence C

  1. If applicable, assemble the intake and exhaust manifolds to the head. Use new gaskets.
  2. If applicable, install the cam, rockers and camshaft holders.
  3. If equipped, install the EGR crossover and air suction pipes.
  4. Connect the exhaust pipe to the manifold using new nuts.
  5. Install the timing belt.
  6. Install the valve cover.
  7. Install the cylinder sensor (if equipped) and the distributor.
  8. If applicable, install the alternator.
  9. Install the power steering pump, then connect the inlet hose to the pump.
  10. Install the accessory drive belts. Adjust the belt tensions.
  11. Install the heater hoses.
  12. Install the cruise control actuator if it was removed.
  13. Connect the spark plug wires. Connect all the wire harnesses and vacuum hoses to the cylinder head, intake manifold and throttle body/carburetor.
  14. Connect the throttle control cable and/or accelerator cable at the throttle body.
  15. Connect the fuel lines.
  16. Install the brake booster, PCV and charcoal canister vacuum hoses.
  17. Install the air cleaner and intake duct.
  18. Refill the engine coolant. It is recommended that the engine oil be changed whenever a cylinder head is removed.
  19. Connect the negative battery cable.
  20. Start the engine, allowing it to idle. Bleed the cooling system. Check the work area carefully for any signs of fluid leakage or any indication of the timing belt rubbing or slapping the covers

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
Thank you for using FixYa.

Mar 05, 2012 | 1993 Honda Accord

1 Answer

Hi there, i want to know is the honda prelude si1988 and honda prelude si 1990 both has the same motor. like 2.0L. thanks.


very similar can definetly bolt in there were some differences in the water temp sensor and the speedo sensor but it can work as a parts or swap engine

Feb 25, 2011 | 1990 Honda Prelude

1 Answer

Whats the bolt pattern for my 1995 ford escort head?


1.8 liter..NOTE: Lubricate the cylinder head bolts using the specified engine oil.

Install the cylinder head bolts. Tighten the cylinder head bolts in 2 or 3 steps in the sequence shown to 76-81 Nm (56-60 lb-ft).

b064be7.gif
1.9 liter
Apply a light coating of engine oil to the threads of the new cylinder head bolts. Install the new cylinder head bolts to the cylinder head. Following the sequence shown below, tighten the cylinder head bolts to 40-60 Nm (30-44 lb-ft). Loosen all cylinder head bolts approximately two turns, then retighten the cylinder head bolts to 60 Nm (44 lb-ft) following the sequence shown. After tightening, turn all bolts 90 degrees, in the same sequence. Complete bolt tightening by turning them an additional 90 degrees, in the same sequence. 398246b.gif

Aug 21, 2010 | 1995 Ford Escort

1 Answer

1990 prelude wont run right acts like 2 dead cylenders pull the plug wire on 4 it dies 1 it dies 3 it runs weaker 2 nothing just nothing just changed the injector and still nuthing


do a compression test on all four cylinder to see if it has low compression. you may have a blown head gasket or burnt valve.

Jun 07, 2010 | 1990 Honda Prelude

1 Answer

Torque specs for head bolts, 1990 Honda prelude si


49lbs I believe but it should tell you in the manual or goto a Kragen store and just flip thru a Haydem or Chilton repair book real quick.

May 03, 2010 | 1990 Honda Prelude

1 Answer

My 90 prelude won't turn off/ has new ign. Cylinder and switch.


ignition switch is adjusted wrong loosen the bolts slide it away from stering wheel. if you still have problem make sure the rod for switch is moving freely with switch.if not that check to make sure you have right switch,if correct sound like you have some damaged wires.

Aug 05, 2009 | 1995 Honda Prelude

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