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  #1  
Old 12-27-2009, 10:56 PM
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Help with removing bottom bolt holding exhaust manifold on

Title says it all.

I have all the other bolts off....well, some of the nuts actually were stuck and ended up just spinning the double sided threaded rods out of the block, but in any case, the top side of the job is done.

Now, there appears to be a single nut that is attached down where the engine mount arm is, but I'm really not sure how best to go about getting this nut off. So before I spend to much more time trying to figure this out, I'd love to hear from someone in-the-know on how I should proceed.

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  #2  
Old 12-27-2009, 10:58 PM
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Is this the nut and bolt that sits on the bottom of the support bracket beneath the manifolds?
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Old 12-27-2009, 11:05 PM
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That sounds like the one, Brian. Never removed it before though. Is it just a nut that I'm looking to spin off of there (like the ones on the top) or is it a bolt?
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  #4  
Old 12-27-2009, 11:18 PM
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From memory, it's a nut and a bolt. Rusted in place since the vehicle was produced and in a very bad area.

Only solution for me was to use a lot of heat with a propane torch in conjunction with Kroil.............my usual solution for big corrosion problems.

My best accomplishment..............removing the following nut from one of the stabilizer bar bushings:

Tackling a starter, need suggestions (and sympathy)
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Old 12-27-2009, 11:22 PM
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Have torch...have Kroil.

But, from what direction did you come at it? What did you remove first before you went at it?
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  #6  
Old 12-27-2009, 11:34 PM
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Quote:
Originally Posted by ck42 View Post
Have torch...have Kroil.

But, from what direction did you come at it? What did you remove first before you went at it?
Been too long, but I definitely realized that I could not get to the upper nut and bolt...........had to deal with the lower nut and the bracket must move laterally to the right to clear the stud.

Now that I recall............it is a nut on a stud.

Coming up from the bottom, I think you can get a decent shot at it.
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Old 12-27-2009, 11:38 PM
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Isn`t that bracket then attached to one of the 2 nuts that hold on the engine mount arm?

I removed the pre EGR manifolds off 3 78/79 300SD and one 79 300TD, every one a PITA. I fought one for 2 hrs w/o heat or Kroil .

The last one I removed the nut on the motor mt arm. 17mm and I worked off the manifolds with the bracket attached.

Early on, after the air cleaner and U-Tube removed, I reached from the front, over the alternator, and under/behind the turbo with a 17mm wrench. and from the left (standing in front of the car) reached in with an extention, and maybe a swival (U Joint) and a lot of #%$@&% banging knuckles etc..... it came off. not always though.

no matter which way you go about it, it is a bugger to remove. should be a stainless sreel nut and bolt.

Kroil is the best penetrant to soak it with.
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Old 12-27-2009, 11:53 PM
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It is a nut and washer on a stud that holds the engine mount arm to the block. I used a 17mm socket with a universal and then some combination of extensions. Access was from above with the air cleaner bracket removed and I think the battery heat shield was removed as well.

I had more trouble getting the nut and washer threaded back on than I did getting it off.

Just what you wanted to hear, right?
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  #9  
Old 12-28-2009, 12:40 AM
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Quote:
Originally Posted by Carpenterman View Post
It is a nut and washer on a stud that holds the engine mount arm to the block. I used a 17mm socket with a universal and then some combination of extensions. Access was from above with the air cleaner bracket removed and I think the battery heat shield was removed as well.

I had more trouble getting the nut and washer threaded back on than I did getting it off.

Just what you wanted to hear, right?
Fantastic...

As it is right now, I've got it all stripped down to just the unbolted exhaust manifold/turbo sitting there. I was thinking that I might have to just start dismantling the turbo in order to get access from above, but it sounds like it's doable leaving it in-place...either from above or below. Seriously hoping the nut isn't too bad to break free.

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