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Overheating Problem

battery

By battery,
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battery Mentor

battery

Posted
Posted

hey guys, got a little problem with my rb20 its getting a little bit hot.

idles around 78-82 which is okay but when i hold the the revs for a while the temps skyrockets... i can be on the freeway doin 80ks and the temp will be 95c on a 15 degree day! but as soon as i take my foot of the throttle and let it coast it drops down to 80ish.

the coolant was flushed 20000ks ago so should be fine

i did a little poking around the engine bay and found that the turbo water line thats behind the block was farked, i changed it but still no change.

im planning on changing the radiator pipes and doing a flush but i honestly doubt it will do anything...

im pretty confident its been bleed properly but its hard to be sure! im getting the temp readings from a nissan consult thing so i suppose its possible the sensor is farked but i doubt it...

thinking about the thermostat but it seems to be opening ok when it gets up to temp.

just really want to get this fixed before summer!!!

any ideas?

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money pit Explorer

money pit

Posted
Posted

Sounds like the radiator is partially blocked, just cause they've got coolant in them doesn't mean it won't block up over time. Had the exact same problem with an old Ford and I dicked around replacing everything else but as soon as I put a new core in the problem was solved.

battery Mentor

battery

Posted
  • Author
Posted
Check your plugs heat range, check oil level. Check radiator, How's your oil pressure? Could also be a blown head gasket.

plugs are good maybe 4000ks old still should be fine they are the correct heat range.

oil lvl is fine but does need to be changed which will be done this weekend.

radiator lvl is fine and i have replaced the cap.

not sure about oil pressure, don't have a gauge.

doubt it would be a headgasket, coolant seems fine, but ill check the oil for water when i change it this weekend.

could be the water pump but when i have the cap off and give it a rev you can see the water moving, and it looks like its moving alot faster than my mates rb20 whos water pump is only 30000ks old....

i reckon ill have to swap the radiator and thermostat and go from there, dont really want to do the water pump looks like a big job.

what do people think of those cheap china radiators, ISC sells them for $299

http://www.skylinesaustralia.com/forums/Is...rs-t216102.html

i figure its going to cost close to $200 to get mine flushed and tanks replaced so may as well go new?

money pit Explorer

money pit

Posted
Posted

Not sure about it being the water pump. If the pump was stuffed bad enough to be causing that kind of temp fluctuation then the bearing would be howling like a stuck pig.

Rough check for thermostat is to drop it in a saucepan of water and bring it to the boil, the stat should open before the water boils. If you have a suitable thermometer you can check the exact operating temp of the stat. Note...thermometer must be one thats rated for cooking.

Pull the radiator and have it checked by a specialist. If they think it can be fixed properly then stick with that one and not the China version. Nissan's OEM gear is HIGH quality.

blind_elk Grand Master

blind_elk

Posted
Posted
Not sure about it being the water pump. If the pump was stuffed bad enough to be causing that kind of temp fluctuation then the bearing would be howling like a stuck pig.
Usual problem is the fins rust away off the impeller. Coz the japs don't like using "green stuff".
battery Mentor

battery

Posted
  • Author
Posted
Usual problem is the fins rust away off the impeller. Coz the japs don't like using "green stuff".

yeh when i bought it there was fark all coolant in it, mostly water... the radiator pipes are full of rusty shit, im gonna do the thermostat tomorrow and if its still no good ill get the rad looked at and if that doesn't work ill do the water pump and may as well do timing belt to.....

battery Mentor

battery

Posted
  • Author
Posted

so i did the thermo today, old one looked okay so i put them both in boiling water couldn't get the them to open... must not have been hot enough but i put the new one in anyway, ill test it tomorrow when the gasket goo dries..

does anyone know an easy way to change this hose its the small black one thats circled, it looks like im gonna have to pull the plenum off....

post-22242-1223114891_thumb.jpg

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