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.

o-rings for coolant pipe?

Old 03-25-2018, 02:19 PM
Junior Member
Thread Starter
Join Date: Mar 2018
Posts: 3
Default o-rings for coolant pipe?

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).
Attached Thumbnails o-rings for coolant pipe?-montero-engine.jpg  
Old 03-26-2018, 12:56 PM
taybrynn2's Avatar
Junior Member
Join Date: Mar 2018
Posts: 22

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

Possibly also

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

Last edited by taybrynn2; 03-26-2018 at 01:00 PM.
Old 03-26-2018, 07:22 PM
Senior Member
Join Date: Oct 2015
Location: Northern VA
Posts: 281

See Post 110

The o-rings are Mitsubishi MD030764 for my 2002 3.5L
Old 03-27-2018, 11:31 AM
taybrynn2's Avatar
Junior Member
Join Date: Mar 2018
Posts: 22

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?
Related Topics
Thread Starter
Last Post
Mitsubishi Montero & Montero Sport
01-17-2018 08:30 PM
Mitsubishi Outlander
12-30-2010 05:32 PM
1st Generation
08-13-2005 01:12 AM
2nd Generation
08-01-2005 08:00 PM
94 3000gt
Mitsubishi 3000GT
01-25-2005 11:22 AM

Thread Tools
Search this Thread
Quick Reply: o-rings for coolant pipe?

Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.