msmithmmx Posted May 7, 2008 Share Posted May 7, 2008 I am trying to remove the head bolts from my 2.5 (engine out). I am using a 18 inch 1/2 breaker bar 14mm star pattern, they will not budge. Any problems with using an 1/2 impact gun? I am so tempted to pull it out... Quote Link to comment Share on other sites More sharing options...
davebugs Posted May 7, 2008 Share Posted May 7, 2008 I believe it's just a 12 point 14mm - atleast that's what I've used on a 2.5 and a 2.2. I find they break loose better by hand with a breaker bar and cheater (if necessary). Engine needs to be on a stand - can't just have it hanging. They creak and it sounds like they are gonna snap off. I have used an electric impact gun on scrap engines. For some reason for me the electric is better then either of my 1/2 air impacts at 155 PSI. I use it for crank and cam bolts as well. Just my 2 cents. Dave Quote Link to comment Share on other sites More sharing options...
subaru360 Posted May 7, 2008 Share Posted May 7, 2008 They get really tight. I use a 2 foot bar to break them loose. You really have to lean into it. They will make a snapping noise a few times then get loose. My compressor doesn't have enough psi to break them loose with an air gun, that's how tight they are. Quote Link to comment Share on other sites More sharing options...
subaru360 Posted May 7, 2008 Share Posted May 7, 2008 ] Oh and your are nuts to try an do those heads in the car. It's much easier if you pull the engine. Quote Link to comment Share on other sites More sharing options...
msmithmmx Posted May 7, 2008 Author Share Posted May 7, 2008 I have the engine on a stand. I think I will try my Impact gun in the AM if no one chimes in that I will break something. Quote Link to comment Share on other sites More sharing options...
screwbaru2 Posted May 7, 2008 Share Posted May 7, 2008 I've used impact on head blots all the time never had a problem. Sometimes if you get them to move by going in the tighting direction they break free also. That would be by hand not impact. You can use the impact to run them out only too. Quote Link to comment Share on other sites More sharing options...
pdeltoid Posted May 7, 2008 Share Posted May 7, 2008 I did mine on a stand, with the head turned vertical, used a 1/2 breaker bar, 12 pt 14mm socket, with a cheater pipe (about 2ft long). I just used nice steady pressure and they came off. They did make a racket though! Quote Link to comment Share on other sites More sharing options...
msmithmmx Posted May 7, 2008 Author Share Posted May 7, 2008 Your not kidding, my craftsmen 400 lb torque was useless. Of to Homedepot for a 2 foor pipe Quote Link to comment Share on other sites More sharing options...
mdjdc Posted May 7, 2008 Share Posted May 7, 2008 The bolts are a beast to break loose. My mechanic and I checked the torque while replacing a 2.5 head and it was up near 90 ft-lbs. I uesd a 36" breaker bar and had someone hold the engine from moving. They came loose, but we still had a job getting them to move. I hesitate to recommend the use of an impact gun. You want to take the bolts out incrementaly so that you don't warp the head. Loosen one and then another, but not too loose at first. Remove them in reverse order of the bolting on pattern. Just use a cheater bar and not the impact gun. The gun may also cause damage to the bolt head if it slips even alittle bit. There is less chance of this with a breaker bar. Good luck Quote Link to comment Share on other sites More sharing options...
msmithmmx Posted May 8, 2008 Author Share Posted May 8, 2008 I picked up a 30 inch pipe, came off with a little effort. I think I found the problem.... Quote Link to comment Share on other sites More sharing options...
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