No Water Pressure

[tricstar]

This is following on from my turbo no water issue..

so I pulled both hoses off turbo and started the car, no water came out of either? after a bit of thinking I put this down to cold engine and thermastat not being open, I also thought maybe a blockage, but I blew in one pipe and coolant came out the other?

I then put a bleed valve inline on one of the turbo water lines, and after taking the car for a drive to warm up and then cracking the bleed, still no water comes out ?? also after a bit of a drive, the top radiator hose is too hot to touch but I can hold the bottom one ??

The odd thing is I'm sure this has been like this for a while (couple of months) and haven't noticed the water temp gauge read any different( standard GTR gauges) and thats including doing some race events etc

What is going on with my water pump? or what could it be?

[Bsa]

Well I wouldn't be driving it to start with. Have you checked the thermostat in hot water

[tricstar]

No, I just check some engine logging and driving around even with a few squirts it's around 82 deg. and at idle 80' ??

if it was a stuffed thermostat or pump you would of thought temps would be higher?

however I would like to rule out thermostat, so I will take it out and check it. How do I rule out water pump?

[Bsa]

Make a check list snd work through it has it 100 tho service? I would

Remove radiator hoses and flush out the radiator for a few min. Remove thermostat and water pump flush the engine I normally use lower rad hose. Also water pumps are fairly cheap not a common thing to break but replace it if you doubt it if it's hard to turn by hand then I suggest a new one anyway or a good secondhand one. If your local I can give you a hand if you need it

Edited April 28, 2012 by Bsa

[tricstar]

Make a check list snd work through it has it 100 tho service? I would

Remove radiator hoses and flush out the radiator for a few min. Remove thermostat and water pump flush the engine I normally use lower rad hose. Also water pumps are fairly cheap not a common thing to break but replace it if you doubt it if it's hard to turn by hand then I suggest a new one anyway or a good secondhand one. If your local I can give you a hand if you need it

engine about 20k old, so is 65mm ARC radiator, yeah start with thermostat then water pump...

cheers Blake, nah I'm in Perth, but thanks

[Bsa]

Oh fresh motor where all hoses replaced

[zebra]

Do you have a pic or diagram of how the water lines run?

[tricstar]

yep all new hoses,

I did the water lines to/from the turbo, took the feed from same place as stock feed, under the intake towards the back, and returned to factory spot, top rad hose on engine?

did this about 18 months ago and there was good flow when I tested it, think I've answered my own question there.. must be thermostat or pump !?

[Joel K24 civ]

omg are you guys kiding or just know that little about cars, water pressure has nothing to do with the pump or thermosate, it is purly from heat resulting in the coolant/water expanding, and it is this expansion that pushes water throught the turbos bypasing the thermostat to the top radiator hose.

of corse the bottom radiator hose is cool the coolant/water has been through a radiator thats whole job is to wash heat out of the coolant/water, if it was hot then there would be a problem

Edited April 28, 2012 by Joel K24 civ

[Bsa]

Another newby on the seen I see. The water pump creates flow and yes water expands causing pressure. Also a small warning be very careful how you talk to people that have been around a while or be prepared to be written off big time also try to know people proffesions before making a comment like that

[battery]

When you had the engine running with the hoses off did you rev the engine or was it just at idle...

[tricstar]

omg are you guys kiding or just know that little about cars, water pressure has nothing to do with the pump or thermosate, it is purly from heat resulting in the coolant/water expanding, and it is this expansion that pushes water throught the turbos bypasing the thermostat to the top radiator hose.

of corse the bottom radiator hose is cool the coolant/water has been through a radiator thats whole job is to wash heat out of the coolant/water, if it was hot then there would be a problem

omg fss, ok I should have said "flow" not pressure.. and the turbo feed should definately have flow when the engine is running. Well it did when I put it in. Obviously there is going to be a difference in heat between top and bottom hoses, but I would have thought if there was 80 degree water going through it, it would be hotter.

anyway seen as we all know very little and you know all, why is there no water going through my turbo now, when there was previously??

[tricstar]

When you had the engine running with the hoses off did you rev the engine or was it just at idle...

yeah did give it a couple of rev's..

And I remember now when I first installed the lines and started the car with the line off to check for flow and coolant definately pumped out..?

[Bsa]

Haha love it when the op gets into the newbys. I'm thinking Pump dude but a good flush always is nice

Edited April 28, 2012 by Bsa

[DVS JEZ]

Take the turbo water line off again and then get a garden hose and use it to pressurise the system from the radiator cap opening. U should see water flow out the turbo lines.

[XKLABA]

although joels wording is rough he is right, there is no direct path of flow for the turbos they have a banjo fitting on the side off the block, which when the thermastat is closed is a closed system with the water circulating around the block through the head a around again, so the flow of water for the turbos comes from the water getting hotter in that closed system faster then the water outside it there fore expanding faster to and then pushing through the turbos around the thermastat to the top radiator hose where the pressure/ heat is less, then when the thermastst opens the pressure changes and the water changes direction and gets pulled back into the block in a see sawing manner,

if the its not getting hot and the temp is fairly consestent then I don't see a problem, but either start the car with radiator cap off and watch, when it gets hot and the thermastat opens the water will flow past the cap. when that happens give it a rev from the throttle cable and the water should fluctuate in the radiator, less will only happen at or near full operating temp

just cause you have been on here for a while doesn't mean you know anything, and how do you know what joel does for a living just cause he is new to SkylinesAustralia doesn't mean anything about his knowledge of cars, so get off your high horse and think about what someone writes and see if it is correct.

but by all means if the op wants to go to the expense of changing the thermastat and pump off bad advise he got off a computer then go right ahead

[DVS JEZ]

Who needs water cooling these days

[tricstar]

Costs nothing to be civil, but that seems to get missed on the internet.. lets no turn this into a bitch match.

I'll try all of the above before I go pulling stuff apart. It did have an oil only turbo on it before ( Turbonetics GTK850) since changed to TO4Z, pretty sure that hasn't had water for a while now either, still fine, just smells warm when you shut it down, want to sort it before I kill the bearings.

also I had the radiator cap off yesterday when the water was warm and there didn't seem to be flow in the radiator ? not obvious anyway?

Edited April 28, 2012 by tricstar

[WMDC35]

If you can get a snap on camera or similar you can check the waterpump impellor through the hole when the thermostat is out, saves taking all cambelt off and is a 2in1 quick check

[t_revz]

If you can get a snap on camera or similar you can check the waterpump impellor through the hole when the thermostat is out, saves taking all cambelt off and is a 2in1 quick check

If you wana do this I have a waterproof bore scope you can borrow Richard. But I think if there was a problem with the pump then you would have noticed when you raced last weekend. Coming to Perth tomorrow if you want it for a while