1600/510 running hot to overheat L18 twin 44 solex carbies why running hot?

[SwitchDat85]

My 510 1971 year with L18 runs hot why

[datzenmike]

Lets assume the engine tune is not the cause for a minute.

 

This leaves lack of air or lack of water flow/heat transfer to the air.

 

Poor air flow...

Do you have the fan shroud in place? Shrouds increase the fan's cooling efficiency.

 

Do you have a clutch fan? It should turn by hand but be very firm to turn. If loose, the silicon oil has leaked out and the fan will not reach it's intended 1,500 RPMs @ 4,000 water pump pulley speed.

 

Fan blades broken?

 

Are the rad fins plugged with road debris, leaves and bugs?

 

Are fins missing from the tubes? damage?

 

 

Poor water flow...

If tap water is used crusty hard water scale deposits will clog the rad tubes. Open rad cap and look. Use only distilled water and a good antifreeze/coolant.

 

Look at lower rad hose while revving the engine... does the hose collapse from water pump suction because it's too soft? Hoses rot from the inside out and my look fine.

 

Have you by-passed the heater core by joining the two heater hoses? This is a no no as the water going through the heater (now missing) is not going through the rad and returns to the engine still hot. Just block the flow somehow.

 

Fan belt slipping or oily/damaged?

 

Is there unexplained coolant loss? Head gasket may be blown or blowing compression into the cooling system and over pressurizing it and expelling water.. 

 

Most common problem is faulty thermostat. Don't waste your time testing... you have to remove and replace the gasket anyway... replace with a new one. No $3 WallMart crap, spend $10-$12 on a good quality one.

[510SSS]

Well if you're in Perth it's probably 105degrees and desert climate, so maybe throw down some $$$ to get a proper Koyorad 2 row radiator and get some electric fans that are thermostatically triggered installed, so it creates a cooling cycle, forget the stock fan or clutch fan this is not the 1970's, you get caught in modern day traffic stuck at a light you're bound to boil you're carbs from sitting there.

[datzenmike]

Perhaps define HOT. Get an Infra Red 'gun' and shoot the thermostat housing when you think it's hot. See what it says. 185-190 is ok. Datsuns are designed to operate in tropical climates but for this you must pay more attention to your cooling system needs.

 

Electric fans are not going to help a clogged radiator, faulty thermostat or a by passed heater core. So check those first.

 

 

If this is a problem with vapor lock or 'boiling the carbs' this isn't the engine over heating. It's just high under hood temps and that happens if it's hot out

 

My 510 1971 year with L18 runs hot why

 

Need more info.

[MikeRL411]

Every body, just remember!  In Japan it is customary, and sometimes required by manufacturer's warranty, that every morning before starting the engine, the driver must check the oil and water level before attempting to start the vehicle!  This is the primary reason that the early Mazda rotary engined vehicles were so successful in Japan and failed in the USA!  A friend of mine in Montana followed the DVM guideines and despite minus 40 temperatures in winter never had any problems with his early Mazda rotary sedan!  Not to say his Renault did not!  But that's another story!  Apparently French and customer savvyy Japanese Engineers have different priorities when attenpting to conquer the world!

[shacks510]

I have a koyorad with my LZ22 with a stock 4 blade fan and it sits at 170* on hot days with a 160* thermostat. It'll run at 160* when its cool out.

 

I'll probably put the 180* back in.

[racerx]

Never had elect. Fan on my ol skool.cars and never overheat. I sometimes get stuck in traffic in hot days and never over heat (Down town sj) except when my tstat went out on 65 mustang and datsun 510. Also had 75 celica w stock rad and overheated cuz fuel was too lean.

[banzai510(hainz)]

Your in Perth. Its already HOT.

 

Mine will run HOt also unless IM driving. In traffic I got to watch it. I rencently put 3 cores in both my 521 and 510.

[racerx]

so what does hot mean? 1/2 way, 3/4 of the gauge?  temp?  open rad and stick a thermometer in there and let it idle for like 15 minutes and correlate the reading with gauge.

[datzenmike]

Use an IR gun (infra red) and shoot the thermostat housing for a truer reading. It should be 180 -185F. First and cheapest thing to do is replace your thermostat with a new one. Not a $2.99 special. Nothing like spending hundreds on a three core rad and find out it didn't help because of a $5 thermostat failure.

[racerx]

Just as long as u dont get stat at autozone, 2 fails

[Ranman72]

tell us how hot hot is 

is the gauge at 3/4 so you think its hot or is it running 210 and is hot 

my stock gauge reads 3/4 at 180 degrees on a autometer after market gauge 

what is the actual temp you are getting ?

[racerx]

what happened?

[banzai510(hainz)]

He moved to Iceland and now its fine

[datzenmike]

One hit wonder. All engines run 'hot', at least hotter than I would want to touch. Define HOT. Gauge full over to the right? Could be the gauge or sender. Does it steam and boil over?

 

I guess he got his answer.

[racerx]

hope he's okay but there are times when peeps ask for help or opinion and they disappear.  :confused:

[datzenmike]

Sure. If I had bought a Ford Fouk-ass and it fucked up I would go to a Fouk-ass forum for help. Not an enthusiast, just need it fixed, got enough friends, don't need friendly banter.