Constantly Leaking Water Hose's

[W0rp3D]

A few weeks ago i got a split in my top rad hose, didnt think much of it, was a clean little slip that only just pierced the inside of the hose, had another so i replaced it, then a couple of days later i had one of the ones under the inlet manifold start to leak, after pulling it off i found that the pipe it was on was rusted at the end, about 5mm of the end just broke off and right where the hose was pierced was a jagged bit of pipe, cleaned it up and replaced it with what looks like an almost brand new one off a spare motor i have, a couple of days after that the alternator/water pump belt broke (has been on its way out for a while but i just kept tightening it), after replacing that all was fine for another couple of days but now there is another water hose leaking under the inlet manifold, cbf fixing it any more so i'll let it sit for a while.

Also when it went last time i had been giving it a bit of a hiding and the temp only went up when i parked it and left it idling, steam was coming out from under the manifold (i assume the leaking hose) but the radiator cap was only warm so was the top rad hose but the hose had pressure, i cracked the rad cap and steam started to come out, waited till it was done them topped it up and drove home normally (actually a bit slower) on the way home it lost no water and the temp did not go over 75 (normally sits at 72-75) im just wondering if maybe the thermostat is not opening which is creating more pressure and splitting old hoses, any suggestions? also has anyone got a picture of all the hoses under the manifold, the manifold i have has had everything removed so im not sure what goes where.

[DVS JEZ]

Sounds like the hoses and cooling system is getting old. Needs some TLC.

Worst case its ur headgasket. Do u have an aftermarket radiator cap?

Try a new one with stock pressure

[W0rp3D]

Sounds like the hoses and cooling system is getting old. Needs some TLC.

Worst case its ur headgasket. Do u have an aftermarket radiator cap?

Try a new one with stock pressure

I put a new cap on when i replaced the last hose, got it from burson and they looked it up to get the right one so i assume its right, i also replaced the thermostat and water pump about 20,000k's ago when i did the timing belt, i might pull the thermostat out and check to make sure its working when i replace this hose.

The radiator i replaced not long ago as the old one was clogged with rust, it was with another second hand stock one but was like new without a hint of rust in it.

There is no water in oil or oil in the water and it does not use any oil or water (when its not pissing out of a split hose).

Got me stumped, it may just be old hoses at the end of there life as the ones i have pulled off so far look like they have been on there since the day it left the factory but i also wanna make sure its not some thing else that is going to blow the new hoses as soon as i finish changing the old ones.

[mystery_kid]

sounds like some real bad luck lol

[HYBR3D]

Ive found coolant dripping under my car, its hard to see where its coming from, but im suspecting the hose under the manifold, the clamp looks a little wet. not looking forward to replacing that hose if it is seems like a common thing for the old 32's must be around that time that they all start breaking

[mystery_kid]

there are a few hoses that run under the intake manifold as well as around the back of the engine

sucks to replace them because you have to take the manifold off to get to them pretty much, best to do them all at the same time with new clamps to be sure.

[W0rp3D]

i know of 3, there is one that goes to the turbo from the inlet manifold, its hard line off the inlet manifold to the back of the head then a 90 degree rubber bend then hard line again, the rubber bend is about 3 inches long, that one is a complete bitch to replace, ended up using a hose from the manifold end all the way over to the turbo.

The second one i have replaced is under the from of the manifold, once you remove the three 10mm bolts holding 2x bundles of wiring and 1 big hose you can push them out of the way and get good access, my problem was that the clamps were around the wrong way which made it a bit of a bitch.

The one that is leaking now im now too sure about, need a pick from the underside of the manifold to see how many more are under there.

[mystery_kid]

rb25 isn't that much different to the rb20, when i had my r32 i had a hose under the intake manifold go on me and almost overheated the engine.

i was lucky the one that went i was able to get to by taking the starter motor out and i was able to get 1 hand up there to replace it. with a lot of swearing

so after that i went and ordered all new replacement hoses from nissan (most of them are moulded so you have no choice) there was about 7 or 8 all up under and around the mani and put them in with new hose clamps, i took the manifold off to do it because it was just too retarded to get to most of them without doing that and while i had the manifold off i had a mobile fuel injector cleaner guy come out and clean/test my injectors while i had them out of the car.

it's a prick of a job to do and the 7 hoses i ordered costed me about $300 (and that wasn't for heater hoses either) but it's good knowing after you have done it that you're not going to have anymore coolant hoses bust for a long time. especially if you take the car on the track which was my main concern

if you have had that many hoses go on you i'd defintely be replacing them all rather than chasing your tail everytime another one goes

Edited January 1, 2012 by mystery_kid

[W0rp3D]

In the back of my mind i know i should take the manifold of and replace all but i just dont want to lol, i know it will be a prick of a job.

[mystery_kid]

it is easier to take the mani off and do them all, than not taking it off and trying to f**k around doing 1

it's actually not a hard job at all, it's just slightly big job takes some time if you aren't a pro mechanic who could knock it out in half a day or whatever

changing the hoses is a peice of cake ones you got the manifold off and worth it for the peice of mind after imo

[W0rp3D]

I found a pic of the water lines under the manifold:

Now the question is what is the heat sink looking thing attached to the oil filter, i have had a look at the one i have in to garage and it seems there is a hose in and out but the water does not leave that unit other than through the hoses.

What im hoping to do is simplify whats under there and make things easier to get to.

The plan is to by pass the oil unit all together and run a hose from next to the thermostat housing all the way to the heater hose at the back of the engine bay eliminating the hard line that is bolted to the engine and the 2 rubber lines going in and out of the unit at the same time, the two lines attached to the unit go to the other heater hose so i would assume that i would have to put a T piece in the heater hose i put in to connect that line back up, assuming that i cant just delete it all together.

The hose that i have already replaced is the one that starts above the oil filter and goes into the heat sink, i assume that the one leaking now is either the one coming out of the heat sink or the one that comes out of the bottom heater hose and goes to the trhrottle body (not in the picture), either way if i can do things they way i have mentioned it eliminates a couple of possible problems and makes replacing the hose's easier and cheaper.

[mystery_kid]

heh looks like some kind of oil cooler?

the new leak could also be a clamp you need to tighten up again from when you replaced that hose before.