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blind
Re: Need help with my 1200gx, it runs hot??????????
#11
Just popping in
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2006/6/8 12:01
From South - Africa
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If you put your hand on the tappet cover and move your hand in the direction of the firewall, its the hottest at the back(the firewall)So this is the place where the the water that runs through the heater, re-enters the head. But i will rather make sure that the spot i'm describing is really the hottest

Posted on: 2007/2/23 6:30
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kululadotgroen
Re: Need help with my 1200gx, it runs hot??????????
#12
No life (a.k.a. DattoMaster)
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From Cape Town ZA
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Quote:

blind wrote:
Hey datodude,I'm running coolant and the previous owner did aswell and i cleaned all the ports when I rebuilt the engine. I hope I can find and solve the problem because my gx is suffering and i know that the double valve-springs is softer as a result of the heat, because it can not rev more than 5600rpm.


Might sound stupid, but is your timing also correct, timing can also cause an engine to run hotter than normal. Might also point to why your car won't rev past 5600, which is very low.

Quote:
I learnt a trick with thermostats. It pays to drill a hole in the upper part of it, a small hole. That is insurance against a sticking unit. If that happens, you will run warm, but not boiling hot.


We also do this, drill a small hole on the rim/flange of the thermo, about 3mm. It pre-curcilates the water, so that you have less thermal shock when the thermo opens. Some production thermo already has a little hole with a little piece of copper rod through it pinched on both sides.

Posted on: 2007/2/23 6:46
_________________
1200 GX Sedan
New(being installed)
4AGE 20V NA

Old
4AGZE 16V turbo
196.5KW/283NM
800m - 200km/h
400m - 12.3s
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pager
Re: Need help with my 1200gx, it runs hot??????????
#13
Home away from home
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2003/3/21 0:15
From Tamworth, NSW
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Quote:

blind wrote:
If you put your hand on the tappet cover and move your hand in the direction of the firewall, its the hottest at the back(the firewall)So this is the place where the the water that runs through the heater, re-enters the head. But i will rather make sure that the spot i'm describing is really the hottest

Maybe disconect your heater.

Posted on: 2007/2/23 7:07
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Project coupe:
Just drive it
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short-coupe
Re: Need help with my 1200gx, it runs hot??????????
#14
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yerr i agree, check your cam timing

Posted on: 2007/2/23 7:15
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boofhead
Re: Need help with my 1200gx, it runs hot??????????
#15
No life (a.k.a. DattoMaster)
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From torquay, victoooooria, australia
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if its really such a hard to solve issue you can box up the engine and send it to me ... ?? i'll happily check it over and let you knoe how it goes

Posted on: 2007/2/23 7:19
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My Datsun is small and turns corners fast ....
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1200GXman
Re: Need help with my 1200gx, it runs hot??????????
#16
No life (a.k.a. DattoMaster)
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2003/11/28 9:12
From South Africa, Bloemfontein
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Quote:
i'll happily check it over and let you knoe how it goes


I bet you would hey?
Make it howl like a wolf at 8000rpm.

I wonder now, is his heater not blocked and causing water to circulate slower through the head or something? Mine I disconnected and ran the water pipe from the back of the head back to the front pipe that goes into the radiator.

Double check everything from the beginning. Somewhere something small is wrong. Check timing as mentioned and thermostat.

Posted on: 2007/2/23 8:16
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1977 Datsun 1200GX
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blofly
Re: Need help with my 1200gx, it runs hot??????????
#17
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2005/9/5 14:02
From Bunbury Western Australia
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Quote:
i know that the double valve-springs is softer as a result of the heat, because it can not rev more than 5600rpm.


I never really thought about that consequence of overheating good point I hope your valve springs are going to be ok, it is one extra job that would pi$$ me off way too much if I had an overheating problem

Posted on: 2007/2/23 23:00
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Two things that drive me nuts.....a dry road under a grey sky and a wet road under a blue sky, because no matter what, it's either too soon or too late to drive the way I want
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