Question about Chevrolet TrailBlazer
What is the procedure for changing the head gasket on a 2007 chevrolet trailblazer with a 4.2 liter inline six?
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
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
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
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
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
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
Tips for a great answer:
May 13, 2017 | Cars & Trucks
Sep 13, 2016 | 2007 Chevrolet Trailblazer
Mar 07, 2013 | Cars & Trucks
Sep 12, 2010 | 2005 Chevrolet TrailBlazer
Mar 15, 2010 | 2005 Chevrolet TrailBlazer
Jul 31, 2009 | 2003 Chevrolet TrailBlazer
Jun 15, 2009 | 2002 Chevrolet TrailBlazer
May 13, 2009 | 2002 Chevrolet TrailBlazer
Apr 06, 2009 | 2002 Chevrolet TrailBlazer
190 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: