Vehicle: 02 Montero Sport Limited 3.5L
What part number do you guys use for the o-rings on the coolant pipe? Is part number B45797 a universal fitting one? Will that one work or is there a better one? Can't find any information from manufacture sites or anywhere else, and the local parts stores are pretty useless around here.

Right now I'm in the middle of tearing the engine somewhat down. It was leaking coolant everywhere from a couple of spots. Lower intake gasket and one O-ring, and one of the gaskets from the crossover pipe(?) all failed. So I'm replacing all the gaskets from the valve covers up, camshaft seals. I'm also putting on a new timing belt and water pump. I'm just going to say the engine ran pretty hot. It started running hot on my Fiance but she said it wasn't up to the "H" lol. It was pretty low on coolant by the time she made it home. I looked it over, couldn't find the leak (without tearing it apart), checked oil to see if coolant made it way in there (no), added coolant back in it and started it up. It still ran fine despite leaking everywhere so hoping we got lucky and caught it in time.

So far this is what my parts list looks like: New valve cover gasket kit, Upper and lower intake gasket, plenum gasket, (2 O-rings for coolant pipe cant find), 2 water outlet gaskets for bypass pipe (cant find exact one), camshaft seals, couple heater hoses, gate connector, new plugs and wires while I'm in there, timing belt, water pump, tension pulleys, and debating on cam position sensor while the front of motor is torn apart as well.
Any other recommendations?

Pic below is the coolant pipe (Need 2 O-rings) and what it is connected to at the back of the motor (Need 2 gaskets for).

 

I'm seeing maybe PN MD030764 for the o-ring on the coolant pipe?

Possibly also MD030763

Maybe change this to your year, but here is the link to the part I found for my 2003 LTD 3.5
linky

 

See Post 110
https://mitsubishiforum.com/forum/mi...-48920/page11/

The o-rings are Mitsubishi MD030764 for my 2002 3.5L

 

how hard is it to remove the lower intake? Is is necessary to remove the lower intake to replace both o-rings on the coolant pipe?

 

This is what I was wondering but for my 2003 3.8L limited. You did it for the 3.5?