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Here's a link to the ehonda store for a 2005 MDX oil pump. The seal is #22.

http://estore.honda.com/acura/parts...=2005-mdx-5-tourpkg-nav-5at&sn=&b=E++1301&dl=

Two more links that show the pump and a diagram of a Honda V6 - might not be exactly your engine but the arrangement of the seal behind the crank timing cog will give you an idea that if it leaks, it has a good chance of getting on the timing belt.

https://www.google.com/search?q=acu...7AkIQA&biw=1280&bih=893#imgrc=DPojGXV2ayEwtM:


http://belt.bcome.us/2004-honda-accord-timing-belt-diagram/


You didn't mention how much the dealer wants but if you're shocked at the price, well first if the diagnosis is correct, it's a lot of work to get to and put back together and second, it's a dealer. Maybe get quotes from independent shops.

It's also not an easy thing to check for a leak in that location. The oil could be staying in that region or on the belt because it could be getting spun around as it leaks from the crank. There might be a notch (no promises) at the interface of the engine and very bottom of the lower timing belt cover that would allow pooled leaking oil or coolant to get by. An easier inspection (again no promises) might be to look in the peep hole of the cam sprockets with a flashlight and see if the belt is shiny, wet, maybe run a rag past it. The peep holes are tear drop shaped rubber grommets you can pull and spin out of the way.

This is one of those situations if your wrong and ignore it, will result in major engine damage if that belt breaks. You'll also have the trouble and hassle of an unexpected breakdown. It's probably worth $75-$150 to have a mechanic at least inspect it and show it to you to be leaking or good.

Good luck!
 

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Couple things: a closer look at the ehonda diagram and a picture of the oil pump does show a weep hole notch where oil could seep out. However, there's a boss that could block the oil somewhat. Picture attached.

Also just looked under the hood of my 06 X and you might be able to see the notch area if you removed or bent the plastic shroud out of the way. If the peep hole in the cam gear cover is too hard to view, taking it off or at least removing the 3 upper bolts and bending it out might work. Then again, a pro might have a better, faster, easier way to check.
 

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