dakota exhaust manifold bolts breaking

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mr burns - 10 Nov 2005 01:35 GMT

how many people having this problem with their 3.9L engines? mines a 99 and
it blew the heads off the rusty bolts at 88000kms. the dealer here thinks i
am going to pay him $1000 to fix this.

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TBone - 10 Nov 2005 03:05 GMT

And he will be right if you have him do the work.

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If at first you don't succeed, you're not cut out for skydiving

> how many people having this problem with their 3.9L engines? mines a 99 and
> it blew the heads off the rusty bolts at 88000kms. the dealer here thinks i
> am going to pay him $1000 to fix this.

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Billy - 10 Nov 2005 21:35 GMT

I have done it twice in 197,000 miles

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-----------------------------------------
Billy K
95 Ram 2500 C 4x4
95 Dakota Sport
05 Jeep X
85 Dodge Van
70 Merc Montego

> And he will be right if you have him do the work.
>
[quoted text clipped - 4 lines]
> i
>> am going to pay him $1000 to fix this.

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mr burns - 11 Nov 2005 12:50 GMT

did you do it yourself? or what did the dealer charge you?

> I have done it twice in 197,000 miles
> > And he will be right if you have him do the work.
[quoted text clipped - 5 lines]
> > i
> >> am going to pay him $1000 to fix this.

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Billy - 11 Nov 2005 13:43 GMT

I did it my self, but I was lucky. none of the broken bolts were flush with
the head. i.e. their was some bolt sticking out to grip and work them out.

don't use exhaust gaskets, I did the first time, nothing but trouble. just
clean the head and manifold good. make sure they are flush with each other
when you reassemble. first time I used OEM bolts. last time I used grade 8
black from hardware store, still holding.

Signature

-----------------------------------------
Billy K
95 Ram 2500 C 4x4
95 Dakota Sport
05 Jeep X
85 Dodge Van
70 Merc Montego

> did you do it yourself? or what did the dealer charge you?
>
[quoted text clipped - 8 lines]
>> > i
>> >> am going to pay him $1000 to fix this.

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mr burns - 12 Nov 2005 21:07 GMT

thanks billy,
think mine is flush with the head. may try to drill it out next summer. it
doesn't bother me that much for noise. a friend told me i would cause the
cylinder to lean out, which i can't understand?? it is the exhaust manifold
after all.

brian

> I did it my self, but I was lucky. none of the broken bolts were flush with
> the head. i.e. their was some bolt sticking out to grip and work them out.
[quoted text clipped - 15 lines]
> >> > i
> >> >> am going to pay him $1000 to fix this.

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Tom Lawrence - 12 Nov 2005 23:06 GMT

> think mine is flush with the head. may try to drill it out next summer.
> it
> doesn't bother me that much for noise. a friend told me i would cause the
> cylinder to lean out, which i can't understand?? it is the exhaust
> manifold
> after all.

Well, yes, but also remember the engine was designed to operate with a
certain amount of backpressure. With the exhaust leak, you've lowered
backpressure, which will let some of the A/F mixture escape during the time
the valves are overlapped. The lower the RPMs, the more pronounced the
effect of reduced backpressure.

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Denny - 13 Nov 2005 01:34 GMT

>> think mine is flush with the head. may try to drill it out next summer.
>> it
[quoted text clipped - 9 lines]
> time the valves are overlapped. The lower the RPMs, the more pronounced
> the effect of reduced backpressure.

Also a manifold leak will draw in outside air as the exhaust pulses go thru
the manifold. The oxygen sensor will pick up this extra oxygen and richen up
mixture to the point you could get a fault code.

Denny

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