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91 Accord LX 2.2L exhaust manifold cracked
Folks,
I smell a whiff of raw fuel in the cabin at cold start up for about a minute. My good (but expensive) shop tells me that my exhaust manifold is cracked, but the price tag is $650, and I don't think I can foot the bill, but I'm thinking about replacing it myself. Access to the manifold looks pretty straightforward. a) Is the manifold cast, or is it something weld-friendly (mild steel)? I'd investigate having a friend weld the manifold, but not if it's cast iron. A new one is $200. If I can find one, a used one should be even less. b) About how much time would I be in for to remove/replace the manifold, assuming I've got the right tools, have read over the Helm description a couple times, a good work area etc but that it's my first time?The down pipe was done only a few years ago, so I think fasteners/O2 sensor might not be too much of a bear to get off. c) Anything else to do while I'm in there, or stuff to watch for? Thanks, Arthur |
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I replaced a manifold on an Accord just like yours at about 180-200 k miles.
Cracked between cylinders 3 & 4. Best of my recollection, the manifold is cast iron. The part is expensive from Honda, I got one from a local yard for $75 including a working O2 sensor! Good thing too, because not only was it $$$, Honda parts had none in their system and didn't know when more would be available. I figured I had a leak because it was abnormally hot under the hood in one spot. Didn't see it upon first examination, but was evident once the manifold was off. Look for carbon traces on the manifold, then look more closely for the crack. It will also be hotter in the are of the leak once the engine is hot. Don't remember whether I got the manifold gasket from NAPA or Honda--if it was available at the former that's where I got and it was fine whichever one it was. Don't forget to buy new A-pipe seal rings, too. Good time to check out your A-pipe as well. Napa has a cheaper alternative than Honda, that is ok--it may be a tad noiser than Honda's pipe. No special tools need to remove the manifold. And, the O2 sensor can be removed without a special socket once the manifold is out. The local dealer may do you a favor and remove the sensor if you bring the manifold to them with some donuts... One of the auto parts chains also has tools that you can borrow for this. Clean up the manifold there is any rust or pitting. Must be flat to get a good seal. You will have to fiddle with the alternator (?) heat shield to get the manifold out, but shouldn't have to remove the alternator. And since while I'm talking about alternators, if you have a high mileage car, look into replacing the alternator brushes. It's a lot cheaper than an alternator and easy to do. Check your heat shields while you're under there. If you ever park on grass or fields, it would be good to replace them if they are totally shot--they are not as cheap as we'd like. If they are partially rusted, but still sufficient, you can strap them on with heating duct clamps from Home Depot. Stops the rattles. Just noticed that you had recently replaced the A-pipe, so ignore my comments. But you'll still want to buy new steeel o-ring seals. I had no problem with any of the nuts&bolt even though some were VERY rusted. Just heated them with a propane torch and then sprayed liquid wrench on them AFTER THE TORCH IS OFF--sweated it in just like Cu plumbing and they eventually broke free with a little repetitive tapping on the wrench. Watch out for the fumes. The job can be done in a morning, but leave yourself some extra time if you have to fight a few bolts. It's a relatively easy job, no surprises. Good Luck PS "Arthur Russell" D> wrote in message news:0N_wd.1142$152.627@trndny01... > Folks, > > I smell a whiff of raw fuel in the cabin at cold start up for about a > minute. My good (but expensive) shop tells me that my exhaust manifold is > cracked, but the price tag is $650, and I don't think I can foot the bill, > but I'm thinking about replacing it myself. Access to the manifold looks > pretty straightforward. > > a) Is the manifold cast, or is it something weld-friendly (mild steel)? I'd > investigate having a friend weld the manifold, but not if it's cast iron. A > new one is $200. If I can find one, a used one should be even less. > > b) About how much time would I be in for to remove/replace the manifold, > assuming I've got the right tools, have read over the Helm description a > couple times, a good work area etc but that it's my first time?The down > pipe was done only a few years ago, so I think fasteners/O2 sensor might > not be too much of a bear to get off. > > c) Anything else to do while I'm in there, or stuff to watch for? > > Thanks, > Arthur |
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