How do you replace the metal hose at the rear of the engine on a 2001 montero?

Answer 1

There are 2 metal "hoses" , actually pipes, at the rear of the 3.0 and 3.5 engines. The larger one connects the water outlet, (top hose) to the cast manifold on the rear of the block, sealed by O- rings. Drain the cold radiator, remove the top hose, unbolt the water outlet, remove the top intake manifold, remove misc. small hoses, unbolt the rear coolant manifold and lift free. Separate the steel tube from the cast parts, clean the aluminum parts and reassemble in reverse order with a NEW pipe and O-rings. (If the old one's got any serious corrosion at all, why patch it?) Now would be a good time to change those Iridium spark plugs, too. Which brings us to the other pipe.

The smaller pipe connects the water pump via O-ring, to the heater outlet hose. If your other pipe was rusty, this one is too. Since the pipe passes thru the open valley between the cylinder banks, change it while you've got the upper intake out of the way. Need more room? the lower intake's history in 5 more minutes. Get serious with your inspection mirror if reusing the old back-half of the water pump. This has to SEAL to the O-ring. Old Schoolers used a tiny bit of Prell shampoo to lube O-rings. Almost anything works in moderation. Reassemble and Remember to vent the system,when filling, to ensure no air! (AIR =Corrosion and Overheat)