Mitsubishi Montero & Montero Sport This sport utility vehicle offers more size than the other Mitsubishi SUVs, but manages to keep a sporty look and comfortable feel, unlike many larger SUVs.

coolant leak and O-ring

Old 08-27-2018, 10:05 AM
Junior Member
Thread Starter
Join Date: Sep 2010
Posts: 8
Default coolant leak and O-ring

I think I have coolant leak by O-ring where the water pump is connected to the tube going to the back. Do I need to take off timing belt and water pump to get to it or can I just take off plenum to replace the O-ring? I have 2000 Montero Sport XLS 3.0.
Old 08-29-2018, 05:09 PM
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Join Date: Oct 2015
Location: Northern VA
Posts: 281

Sorry but your diving in kind of deep to replace this.

There are several 0-rings.
Posts 80 and 82 show the o-ring at the back of the water pump

Post 88 shows the pipe with 0-ring to back of pump below the plenum

Post 110 shows the crossover pipe which also has o-rings

Sounds like your leak is at the water pipe to the back of the pump.I think if you pull the plenum and the intake then you can remove the water pipe to replace the o-ring and leave the timing belt alone. See Post 83 last picture which shows how the water pipe is attached at the rear of the engine.

Good luck!
Old 08-31-2018, 05:48 PM
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Join Date: Sep 2010
Posts: 8

Thank you, Larry. I changed the valve stem seals on this Montero Sport before, so I will dig it up again to get to the Oring. It seems the leak is coming out from the block right by the altnator, so I’m guessing it’s faulty Oring.
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