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Car Forum / Honda Cars / August 2004weird distributor cap-eating thing, 85 Civic hatchback
So I have this Honda, US car, 352K miles, 1300cc engine, and for the last few years the thing has been eating a distributor cap and rotor once a year or so. The symptoms are very odd. The inside of the cap is always kind of oily damp with a really sharp acid smell, the aluminum contacts inside the cap are always really corroded with a fluffy white oxide, and the carbon contact button that connects the coil wire to the center of the rotor is eaten away nearly flat and fused with the cap. The metal bits of the part that holds the magnetic pickup are very rusty. And yet the thing starts and runs amazingly well. Every so often I get in there and clean the cap, scrape the contacts clean, etc. Eventually it will get to where it runs to rough that I have to replace the cap and rotor, and then we start all over. Anybody have any idea what's going on here? The only thing that occurs to me is that I recently had to have the head gasket replaced. Is it possible that when the old gasket went bad, it was leaking steam past seals or something and into the distributor housing from below? If not that, then what the heck? I'm hoping to make half a million miles on this beast, if it will last. Thanks quite a lot - Edge > So I have this Honda, US car, 352K miles, 1300cc engine, and for the > last few years the thing has been eating a distributor cap and rotor [quoted text clipped - 18 lines] > I'm hoping to make half a million miles on this beast, if it will > last. I don't have a direct answer to your question but here are some things to check.... There should be a rubber gasket that goes between the distributor cap and the distributor body. If this gasket is missing, broken, or dried up and brittle then moisture can get into the distributor and could be causing some of the corrosion symptoms you're experiencing. The "oily damp" symptom could be caused by a bad oil seal in the distributor. If this is the case, then you may be best off going with a used distributor as, to the best of my knowledge, the seals aren't available from either the dealer or the aftermarket. Check the vacuum advance. This should hold vacuum. If not, then your car's timing will not be correct. Check the advance plate. When you pull vacuum on the vacuum advance (as long as it's not leaking) you should see the advance plate turn a given amount (I don't have exact specs for this but it's roughly 10° or so). With as much corrosion as you're describing, I would be willing to bet that your advance plate may be frozen. Even if it's not frozen, the bearing retainer in the advance plate often breaks. This causes the advance plate to sit crooked resulting in unequal or nonexistent air gaps with the reluctor. Sometimes you can find the steel bearings stuck to the magnet when the advance plate goes south. Check the magnet. You'll need a small mirror and a flashlight for this one. If it's cracked or broken then it needs to be replaced. It's also important to check the mechanical advance. You should be able to turn the distributor rotor 10° or so and then have it spring back. If this doesn't happen, then the distributor will need to be disassembled so that the mechanical advance can be cleaned and lubed. Note that the top shaft in the distributor can go on in either of two orientations however only one is correct. Make some hash marks on it with a carbide scribe indicating it's orientation such that you can get it back together correctly. If you get it wrong, you won't be able to time the car and will need to take things back apart. This diagram should help to give you some idea of how all the components are stacked together, http://tinyurl.com/3tlr8. It's for an Hitachi distributor from an '85 1300 49 state 5spd. The other possibility is that you could have a Tek distributor. If that's the case or the diagram is not correct, then put the correct info for your car into this page http://tinyurl.com/6yprt. Eric Thanks, Eric. I will check some of these things. I'm sure there's no rubber gasket between cap and body. I'm also sure the vacuum advance is broken - I live in Canada and the mechanics here don't have access to proper manuals, so when it had to pass the air pollution tests a few years ago they just did their best and it worked. At the time, they noted that the vacuum advance was broken so they just disconnected it. (Except for roughness due, I think, to the corrosion inside the cap, this thing runs VERY well - good acceleration, 40 mpg in nice weather, starts on the first crank always.) But still, it sounds to me like I may have multiple problems. What are the good sources for used distributors? I'm pretty sure this is a Hitachi unit - the cap is the kind where the cylinder wire connectors come off the cap perpendicular to the axis of the distributor shaft and not in line with it. Thanks again! Mark > There should be a rubber gasket that goes between the distributor cap and > the distributor body. If this gasket is missing, broken, or dried up and [quoted text clipped - 40 lines] > > Eric > I live in Canada and the mechanics here don't have access > to proper manuals, Lol.... Really. Steve Ottawa. > Thanks, Eric. I will check some of these things. I'm sure there's no > rubber gasket between cap and body. I'm also sure the vacuum advance [quoted text clipped - 11 lines] > connectors come off the cap perpendicular to the axis of the > distributor shaft and not in line with it. The following site (= Majestic online) indicates, at least for a 2-door, that it is a Hitachi with perpendicular wire connections: http://www.hondaautomotiveparts.com/auto/jsp/mws/catdisplay.jsp (Check both auto and manual. The site seems a little messed up for auto, but the part numbers appear to be the same, as one would expect. Have you considered online salvage sites? It seems most have online, free searchable inventories. I had really good experience several weeks ago with one. I just tried looking for your 1985 Hatchback's distributor at http://www.autopartsearch.com/about.cfm . For an auto transmission, three 85 Civic Hatch distributors came up, ranging in price from about $55 to $138. For manual, four 85 Civic Hatch distributors came up, ranging from about $55 to $98. Warranties are often offered on such parts. Google for {auto salvage import search inventory}, and more searchable sites come up. Ebay often sells distributors but I saw nothing for a 1985 Civic today. Updates welcome. > Thanks, Eric. I will check some of these things. I'm sure there's no > rubber gasket between cap and body. Yes, then that could be one possible source for moisture and corrosion in the distributor. > I'm also sure the vacuum advance is broken - I live in Canada and the > mechanics here don't have access to proper manuals, so when it had to > pass the air pollution tests a few years ago they just did their best > and it worked. At the time, they noted that the vacuum advance was > broken so they just disconnected it. At first glance the vacuum advance units might seem expensive, Majestic Honda lists them at $40. However, consider that if the engine's timing is incorrect and the engine is pinging that the piston ring lands could be destroyed thereby requiring an engine rebuild. All of a sudden, a little money spent on the distributor seems very reasonable. > What are the good sources for used distributors? The online sources that Caroline mentioned are a good place to start. However, don't forget to check your local newspapers, little nickel, etc. You may be able to find someone parting out a car with your distributor. In that case, you may be able to pick it up for $10-25 or so. Eric Thanks everybody! All your efforts are appreciated. Steve, I'm not exactly sure what your point is, but I'm just quoting the actual mechanics who worked on it - they couldn't get the proper manuals for this car. Nor could the dealers get the proper distributor cap for this car. Perhaps Ottawa is a different universe in this regard. edge |
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