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Need to change head gasket on 2007 chevrolet trailblazer with 4.2 inline six

What is the procedure for changing the head gasket on a 2007 chevrolet trailblazer with a 4.2 liter inline six?

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If you need advise to do ,don't seek help from a expert or some one
that can personally help you, this is a major job,

Posted on Mar 27, 2014

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Posted on Jan 02, 2017

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SOURCE: replacement of a head gasket on 2.5 liter nissan altima 2002

frajogag: First off, be aware that these bolts are "torque to yield" bolts (streach bolts). What this means is that instead of torqueing the head bolts to a specific torque specification, they are torqued down to a set spec and then tightened by rotating the bolts a certain angle, like 90 degrees. and all of them are turned the same amount.
This means that the shanks of the bolts must be checked to make sure they are not too thin (or the bolt has already stretched beyond limits and is prone to snap if used)
Here is how you check the bolts. Measure the bolt using a micrometer, at the base, or within the first 13mm from the end where it threads in. Then go to about 10mm before the threads end heading toward the top of the bolt. There should not be more than a 0.23mm (.0091 inch) or less difference or the bolt should be discarded.
Torque the bolts down to 98.1Nm ( 72.ft lb)
Looking at the head from the side, so you are looking at the full length from side to side, I will number the head bolts in this fashion.
#1 & 2 are directly in front of you and in the center of the cylinder head crossing it width wise.
#3&4 are to the left of #1&2, / #5&6 are to the right of #1&2
#7&8 are to the left of #3&4 / #9$10 are to the right of #5&6
Now, you have the sequence.
After the initial pull, back off all the bolts in the same sequence and then retorque them to 36 Nm ( 28 ft lb)
Using a torque angle wrench or having the ability to accurately judge turning angles. Rotate (clockwise) to a 75 degree angle. do this to all the bolts using the sequence I had provided.
Rotate the bolts (clockwise) 75 degrees again on all bolts in the same sequence. The proceedure is complete!

Posted on Apr 23, 2009

  • 207 Answers

SOURCE: Head gasket torque specs

Here you go, I hope this is what you were looking for:

For 1987-94 models, the cylinder head bolts are tightened in 3 progressive steps. Tighten them in the proper sequence as follows:
Step 1: 50-55 ft. lbs. (68-75 Nm) Step 2: 60-65 ft. lbs. (81-88 Nm) Step 3: 70-85 ft. lbs. (95-115 Nm) Let me know if I can assist you with anything else.

Posted on Apr 30, 2009

mechanicm639
  • 253 Answers

SOURCE: i want to change a head gasket

Ok get ready for a real headache. To change that head gasket you will have to have a lift, some special tools and about 20 hours( for a trained mechanic). It involves removing the rack and pinion steering, oil pan, all of the parts off of the front of the engine, and timing cover. Then the fun begins. That engine has no timing marks on the outside of the engine. You will have to pull the exaust, and intake manifolds, valve cover and coils. Roll the motor by hand till you get all the timing marks lined up han then you can remove the head. If you are not a trained mechanic, you are really getting a tough one to start on. You will need a manuel on all the specs, Good Luck

Posted on May 13, 2009

matney68
  • 426 Answers

SOURCE: reset oil change light

ok turn the key on and pump the gas pedal 3 times and it should flash and then go away.until next service time

Posted on Jul 02, 2009

  • 113 Answers

SOURCE: my 2003 chevrolet trailblazer is idleing rough when stopped

I would start by checking the oil level. See where it is at. Did you have the oil changed by a reputable oil change place or dealership? Let me know if the oil is at the correct level on the dipstick and we can go from there.

Posted on Jul 31, 2009

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1 Answer

How to change ignition switgh for a 2007 chevy trailblazer


Take the cover off, it's a little black box directly under the column.
Cover is a little tricky if you've never done it. Top part is held on by a tiny torx screw on the right hand side. Turn your head sideways and look up there, you can see the tiny head of the screw.

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Engine schematics for 2002 trailblazer 4.2 ltr.


The 2002 Chevrolet TrailBlazer comes standard with a 4.2-liter inline six-cylinder engine. ---------------------------------------------------------------------------------------
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Would like to know where the Cam Shaft Sensor is located in 2002 Trailblazer.


it is the sensor that is being pointed at in the cylinder head


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Sep 12, 2010 | 2005 Chevrolet TrailBlazer

1 Answer

Miss fire on #3 cylinder ,im assuming #3 cylinder is 3rd from front to back,because #3 cylinder is the same either way you look at it on a inline 6 cylinder.thanx cal


Unless GM has changed things the front always #1 and counts up.1-2-3-4-5-6.None of my books show inline 6.Well hope this helps and good luck.

Mar 15, 2010 | 2005 Chevrolet TrailBlazer

1 Answer

My 2003 chevrolet trailblazer is idleing rough when stopped


I would start by checking the oil level. See where it is at. Did you have the oil changed by a reputable oil change place or dealership? Let me know if the oil is at the correct level on the dipstick and we can go from there.

Jul 31, 2009 | 2003 Chevrolet TrailBlazer

1 Answer

Running hot, changed thermostat and flushed coolant, also changed top hose. Any ideas why it would still run hot?


Possibilities.
1. blocked radiator core
2. blown head gasket
3. cracked head
4. water pump
These would be the major problems causing the overheating.
Timing could be another but unless the timing has been changed recently it is most probably one of the causes

Jun 15, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

I want to change a head gasket for 2002 Chevrolet Trailblazer but i dont know how


Ok get ready for a real headache. To change that head gasket you will have to have a lift, some special tools and about 20 hours( for a trained mechanic). It involves removing the rack and pinion steering, oil pan, all of the parts off of the front of the engine, and timing cover. Then the fun begins. That engine has no timing marks on the outside of the engine. You will have to pull the exaust, and intake manifolds, valve cover and coils. Roll the motor by hand till you get all the timing marks lined up han then you can remove the head. If you are not a trained mechanic, you are really getting a tough one to start on. You will need a manuel on all the specs, Good Luck

May 13, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Oil leak on top of valve cover (apparently)


I think you have a bad gasket on your oil filler cap.

Apr 06, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Oil in spark plugs


Could mean a variety of things.....
Possible head gasket leak....(cheap fix if caught early)
Possible Worn piston rings
possible valve guide oil seals

Jan 12, 2009 | 2004 Chevrolet TrailBlazer

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