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Old 06-11-2002, 03:26 PM
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How to get head bolts off

What's the best way to get head bolts off factory engine
450 sl v8 that has never been off. They are stuck from heat etc never been off.
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Old 06-11-2002, 03:59 PM
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I'm not sure about the V8's but all the MB engines I've worked on have stretch bolts. They are really tough to get loose and maybe tougher to retorque, using the proper angle torque method. You will need to get a manual for your engine before going back together.

You will need the correct tool that fits the bolts properly. This is available as a MB tool, but a friend of mine found a set at an auto store that had about three different sizes and one of them fit perfectly. Much less expensive than the MB tool.

Use the correct socket, a long breakover bar and plenty of oomph. They'll come loose.

Good luck,
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Old 06-11-2002, 04:11 PM
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Join Date: Aug 2001
Location: secret
Posts: 3,044
Larry's right. That part about the correct tool is critical. Headbolts ain't the place to improvise!! I got mine from Snap On.
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Old 06-11-2002, 04:14 PM
Potomac German Auto
Join Date: Mar 2002
Location: Frederick, MD
Posts: 407

For some reason you shouldn't be able to get it off with some "oopmhhh" , you can resort to a torch and heat it. CAREFULLY !!
1997 C230
2002 ML320
2000 BMW 528I (WIFEY'S CAR)

"Excuses are crutches for the unfounded."
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Old 06-11-2002, 08:41 PM
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I was at shop the tech had to breal the heads of 3 bolts

and was going to heat a few of the ones on the inside it was tough to get bolts off/. He had spent 2 days trying.

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Old 06-11-2002, 09:20 PM
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Join Date: May 2002
Posts: 105
ballpean hammer and penetrating oil...spray on, tap, spray on, tap, spray on, this 5-6 times then let it sit overnight.
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