Crankshaft seal leak? - Mazda Forum

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Old 11-08-2008, 09:55 AM
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I am trying to locate a very slow oil leak around the passenger side of my 2.5L engine. It leaves about a drop of oil on the garage floor each time I park the car for a number of hours, or overnight. Even after two weeks the oil dipstick is still on "F", but I just drive about a dozen miles or so each time I use the car. I am leaning towards a leaky front cranshaft seal. I recently replaced the oil pressure switch which went from a slow leak to a "pisser" within days. That is completely fixed and the whole area around the oil filter is now 100% clean.
Could the crankshaft seal fail totally and leave me stranded? Also, any ideas what replacing the seal could cost? Don't think I can do this myself.
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Old 11-08-2008, 10:38 AM
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If the front crank seal is leaking, correct me if I'm wrong, but it would be leaking oil into the timing belt cover first - so it is possible for the t-belt to get wet with oil and it coulkd jump a tooth or something eventually down the road. Also, if the seal is down there you would have to do all the regular t-belt stuff (so you might as well replace the belt nd tensioners if you are already in there depending on mileage), and then you just have to pop the seal out and hammer a new on it.
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Old 11-09-2008, 08:08 AM
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First,drop the plastic splash pans under the engine.This will give you a better visual........could be as simple as an oil drain plug gasket.
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Old 11-09-2008, 10:10 AM
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Quote:
If the front crank seal is leaking, correct me if I'm wrong, but it would be leaking oil into the timing belt cover first - so it is possible for the t-belt to get wet with oil and it coulkd jump a tooth or something eventually down the road. Also, if the seal is down there you would have to do all the regular t-belt stuff (so you might as well replace the belt nd tensioners if you are already in there depending on mileage), and then you just have to pop the seal out and hammer a new on it.[/b]
Removed the top 2 screws of the front TB cover to take a peek at the TB. It is dry and also the camshaft sprocket looks clean.
Next I will drop the RH splash shield as Am4wag suggested and see what else is in this area. Everything from the oil filter and back is oil free.
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Old 11-10-2008, 12:49 AM
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Replace the o-ring on the dipstick tube. It's in the same region.
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Old 11-10-2008, 02:54 PM
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I dropped the splash shield and removed the passenger side wheel to look at the oil leak. After I took the following pictures I degreased and cleaned the area. I will check again in a couple days.

Dipstick Pipe
Crankshaft picture 01
Crankshaft picture 02
Crankshaft picture 03
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Old 11-13-2008, 10:34 AM
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After cleaning and degreasing the area shown in the pictures above and driving for about 20 miles, there is absolutely no oil leak there. However, the P/S pump housing is covered with an oil film and has a couple of oil droplets on its bottom. Look at the above "Crankshaft picture 02" where there is a reddish looking drop on the belt adjustment screw. The P/S fluid reservoir is between max. and min. cold and without the engine running. Haven't checked the level in at least 6 months. P/S seems to be working OK and leak is very slow. It could have been going on for a long time. The inside of the splash shield had a thick layer of oily crud. I could not detect any smell of the leaked oil.
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Old 11-13-2008, 12:16 PM
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Any oil leak will accumulate at that position on the crank. It seems to be the lowest portion of the block where oil likes to flow down to. It looks like your valve cover gaskets are probably leaking. The rear gasket causes the PS pump to be covered in oil as in your pic. Very rare for the power steering pump to leak in our engines.
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Old 11-16-2008, 04:35 PM
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I am keeping my fingers crossed. Everything still looks clean and leak free. As an easy prevention I emptied and refilled the PS reservoir with fresh DEXRON III three times. Each time I turned the steering wheel side to side thru 3 cycles. At the last refill I added about 8 oz. of Lucas PS leak prevention for good measure. The old PS fluid looked OK, a dark red. I bought Autozone ATF which seemed a lot thinner than the Castrol DEXRON III of which I had a little left over from before. The Autozone stuff said it complies with DEXRON III applications.
I am hoping my engine stays without further leaks.
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