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I doubt it’s a transmission leak, I think it’s much more likely that the oil pan gasket is leaking. In fact I would advise you replace that and then recheck for the problem.
Thanks Eric. I replaced the oil pan gasket with an oem one from the honda dealership and also used hondabond in the shaded areas according to the factory service manual. I unfortunately wasn’t able to put the exhaust back together yet due to bolts breaking and needing new studs for the exhaust manifold. At least the hondabond will have some time to cure fully though. The parts will be coming in the next few days so i can finish it up and add oil and check for leaks. Thanks again i will keep you updated.
A little off topic but can you possibly post a picture or pm me a picture from the service manual where it says hondabond should be applied around the oil pan seal?
It really only goes on each side of the Pan where it goes down. If you google civic helms you should be able to find the manual in pdf format for free. The other important thing is torquing the nuts and bolts in the correct order and to the correct torque spec to ensure a good no leak seal. if I’m wrong let me know Eric since I’m sure you have done a lot of these.
Only a couple of dabs at the corners of the ‘humps’. If it’s still leaking after that check the distributor, I know that’s far away but they do tend to travel down to that area if the ‘o’ ring on the distributor is leaking. Lastly, rear main seal. Not fun but I normally don’t see transmission fluid leaks like I do oil leaks from the engine.
I looked under the distributor and see no sign of leakage. The rear main was replaced about three years ago when the clutch was done . I finished replacing the oil pan gasket and there is still oil leaking by that bracket that connects the tranny and the oil pan. The leak is Very slow and doesn’t even produce a drip. The oil pan gasket i can tell is not leaking. If i had the flywheel cover off would i be able to tell if the rear main is leaking? Any other tips?
Not really and for me the rear main is still the prime suspect in fact more so since it was changed. If those things aren’t installed just right then they will leak again. There is another possibility that I’ve seen and that’s one of the oil galley plugs leaking on the back of the engine block, it’s not common but it does happen from time to time. The only way to know what’s going on it sounds like is to remove the trans and have a look. One other thing you might think about is putting some dye in the engine oil to see if the dye comes out with the leak, if the leak has dye in it you know it’s engine oil and not trans oil.
Before i start pulling stiff apart I’m going to continue to monitor it since i changed the oil pan gasket. I will periodically just jack it up and take a look. How common are oil pan gasket leaks on these cars? I checked it after i drove about 30 miles and didn’t see anything fortunately. I’m hoping what i saw on that bracket was just from oil pan gasket before i changed it. Can you reuse a Honda valve cover gasket?
My 2000 Civic was also leaking out of the oil pan, rear main. I would also check your hydraulic clutch pumps. Mine seep a little bit of oil after 230,000 miles. Just another possible idea where a the leak is coming from.
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