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erman
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10/05/2007
15:47:49

Subject: exhaust manifold leak
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Took the heat shield off exhaust manifold and seen the problem right away. The 2 rear bolts were broke causing the leak. This is a 2000 Dakota with 4.7 and it has aluminum heads. Does anyone know if the bolts will come out if I am able to drill using an ease out?



OBIO3
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10/05/2007
20:44:49

RE: exhaust manifold leak
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Use good cobalt left hand bits. It may back out just drilling. Leave manifold on to get a good start drilling. Use a bit that just fits the bolt hole in manifold so it centers well. Don't over drill so no head dammage occurs. Now remove the manifold. 2 possibilities here. The bolts are set up well for drilling or there may be enough sticking out to use vice grips on it. Do them all using good bolts long as your at it.



dakota49
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10/08/2007
20:07:51

RE: exhaust manifold leak
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I agree with OBIO3, I think the factory bolts are good enough, just use anti-seaze to be sure if another one were to break it will make it easier to pull and replace.
Good Luck
Dakota49
1988 3.9 4X4 5speed



Mike Stager
Dodge Dakota
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10/08/2007
23:36:47

RE: exhaust manifold leak
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I had to do the same exact thing to my 97 ( cast iron heads though ). I started with the smaller drill bit because I only had one bolt holding the manifold on and couldn't get the manifold to stay centered in order to use it as a drilling guide.

I started with the smallest largest bit that would get me going ( if that makes sense ) and kept moving up from there. When I got to the largest bit that was just under the thread size, the bolt came right out with the left hand bit. Use a good drill, preferrably corded as I did a good job warping my Snap On drill so it doesn't run in reverse as well as it used to.

You should have great access to the bolts by pulling the plastic inner fenderwell off after pulling the tire off.



TobyWD40
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10/09/2007
14:22:35

RE: exhaust manifold leak
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Good Idea Mike, Mines got a small leak at the gasket and I plan to do it soon and was trying to figure out how to get the drill in there. Thanks, TobyWD40 ---- "Some Things,(not many) that even WD40 don't fix".



daddio
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10/09/2007
15:17:49

RE: exhaust manifold leak
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man, i'm glad i don't have that problem down here. i'd dread having to drill those bolts out. do all you guys live in "the rust belt" or what?



dakota49
Dodge Dakota
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10/10/2007
10:13:09

RE: exhaust manifold leak
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Daddio, I can't speak for them but I live in Arkansas, I don't think I'm in the rust belt, but when I rebuilt mine, I used anti-seaze on most all of my bolts. I didn't have any problems with taking mine off either. Mine was blowing so much oil though everything was soaked with oil so that may have helped taking it apart.
Good Luck guys,
Dakota49
1988 3.9 4X4 5speed



lll
Dodge Dakota
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10/10/2007
17:07:15

RE: exhaust manifold leak
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Same thing with my truck exhaust manifold leak
going to have to drill the bolts out. I also have a p0420 code so i hope that is the reason

1998
190,000 miles
V3.9



WD40
Dodge Dakota
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10/10/2007
21:17:44

RE: exhaust manifold leak
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I'm still taking notes, the 2000 4.7 had aluminum
heads, Which Dakotas have Aluminum heads and which have cast iron? Dakota49, Daddio, one of you smart guys figure this out, it might be interesting. When you find out tell me what mine has Ha, 92 Dakota 3.9 Turbo FI. I'm betting on cast Iron because the manifold is all shiny and the heads and block are all nasty looking. It doesn't seem like the bolts would tend to stick in Aluminum. One of my bolts is broken off with about 3/8" showing and it is shiny, almost like stainless steel. It's been that way since my dad bought it in 94. Thanks TobyWD40



daddio
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10/11/2007
08:46:17

RE: exhaust manifold leak
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the only DC engine in a Dak w/ alum. heads is the 4.7. i can assume the 3.7 has them also as it is the same basic design as the 4.7. 3.7 was available strating in '04 when they took away the venerable 3.9.



TobyWD40
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10/11/2007
09:31:00

RE: exhaust manifold leak
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I guess they must have figured it out, but remember the Chevy Vega. I think the heads and maybe the block were Alum. and they would warp so they could'nt be machined to fit if they overheated in the least. I was in the army and several people I knew had Vegas and I know of two that seized and cracked and another that wasn't running right, he broke it down and nothing would go back together. Briggs and Stratton has come out with several Alum. engines in their line of air cooled motors and they have been nothing but problems. I'm sure the technology on Dodge's must have overcome these problems but I think you guys with Alum. should do all to make the engines run as cool as possible. I'm not the expert but it is a thought.
Maybe someone knows all the info. on it and the difference between now and then. Vega's weren't much and it's been a long time since I've seen one, that tells you something, I think it was the replacement for the Nova or something. Thanks Daddio, Toby in the Bafons.



daddio
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10/11/2007
09:43:59

RE: exhaust manifold leak
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you'd be surprised how much these newer alum. block and head engines can take. my son frequently runs his poor lil' saturn 1.9DOHC 4 banger low on oil and coolant. the car has well over 200k on it. a couple of weeks ago he called me saying that his car blew up. fearing the worst, i had it towed home to find, of course, no oil and no coolant in the engine. well, it has overheated(he said the gage was pegged in the red), and blew the drain plug out of the rad. i changed the rad(luckily still under warranty) changed the oil. after a week of being parked the lil' ole Saturn started right up and has never looked back since. i thought for sure either the block cracked or head warped or spun a bearing but nope. this thing is like a Timex.

Sorry for rambling but, i just wanted to get the point across. don't fear alum block or headed engines. they've been around longer than you think.



TobyWD40
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10/11/2007
10:30:10

RE: exhaust manifold leak
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Uh Oh, I was just wondering about the Alum. and I went to recalls hoping they recalled my 92, just teasing. Daddio you might want to take a look before something bad happens to your sons. It seems that there is a sludge problem and the engines are somehow using all their oil. Some head problems being blamed on bad maintanence, and others are fine. It makes me wonder about head warpage because of heat. Do you remember the Vega and it's problems. I'm not looking for trouble, instead trying to help prevent it. One guy even used Mobil 1 and blew an engine. Maybe a combination of things to help them run cooler. Did your sons have a sludge problem? Heat also breaks down oil,(sludge), and causes loss of coolant. Check out the open forums called Dealer recalls. I truly hope this is not a big problem that can't be changed by forethought. TobyWD40



daddio
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10/11/2007
11:18:46

RE: exhaust manifold leak
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WD, the saturns oil consumption problems are not caused by sludge but by carbon build-up in the oil control rings on the piston. there is a semi cure for this that i haven't tried yet. i also frequent a Saturn Forum and have learned much from that site. the one thing i've learned the most from that site is these little "fantasic plastic" cars are virtually indestructable. many people on the forum have well over 200k on theirs. some even over 400k.

best 2k i ever spent on a vehicle. bought it 4yrs ago and i think i've got my moneys worth.



TobyWD40
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10/11/2007
12:41:19

RE: exhaust manifold leak
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I just had a brainfart as you say,you were saying he had Saturn and I had Dodge on the brain, your right I never heard of a Saturn owner being unhappy, but man some of the guys on the recall post here are upset with the 4.7 and also the bigger motors which probably don't have alum. on them. It seems that high heat might not be good on alum., actually not good on any motor, but especially alum. . It seems by my way of thinking that alum. would cool faster since it is a better conductor than iron and heat always moves out. I do know that if it gets to a certain temp. that it doesn't return to shape as iron does and it is a much lower temp. somewhere in the 270's if I'm remembering right. Thats real hot though probably hotter than a car now days, at least one kept up right. Thanks Toby



daddio
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10/11/2007
12:59:17

RE: exhaust manifold leak
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well, you know they say "aluminum" but they have to be an alloy of some sort and would stand up better than plain alum.

now that we've taken this thread way off subject, where were we?



dakota49
Dodge Dakota
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10/12/2007
21:18:53

RE: exhaust manifold leak
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There is one thing I would like to add to this thread, Toby, you said something about bolts not sticking in aluminum, that's where you need the anti-seaze the most, cause they are different metals, the threads can actually weld them selves to the alum. and when you try to remove a bolt it can pull the threads out with the bolt. That's why when you have an engine with alum. heads they tell you to use anti-seaze on the threads of the plugs. I also use anti-seaze on iron heads as well, just makes it easier to remove the plugs when I need to.
Good Luck
Dakota49
1988 3.9 4X4 5speed



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