running temp issues

[TNT ANDY]

I would also get a stat installed.

[Tony Walker]

Ive never had a stat fitted for the 3 years ive ran it, and had no issues

Bet you find winter driving a bit rough

[Nottswoody]

new waterpump and stat ordered, I will hold off buying a hg untill I can rule everything else out.

Ive never had a stat fitted for the 3 years ive ran it, and had no issues

Renault put one in there for a reason bud and I'd say youve had issues lol read above for £17 it's worth having one in.. Eliminate everything

[Jimmy_GTT]

I also have to check my cooling.
Today I've noticed that the fan only turns on for 10-15 seconds than off.
And start again in the next minute. But as I remember the temp switch in the
radiator has a 10 degrees range where it should be kept ON.
Could it be that the switch is not working correctly? Or the relay?

[tubbyG]

Right then, Update!!!..... I have just had a new waterpump, headgasket and head-bolts delivered so I can get this sorted on saturday A few hours max I reckon!!

Just waiting on a thermostat to arrive now, then to get some fresh oil and we're away!!

I will be posting up pics of the headgasket for you guys to (hopefully) analyse

[Nottswoody]

[tubbyG]

Just whipped off the water pump, and I have discovered the problem

the fins on the inner wheel have completely sheared off the shaft and broke into a few pieces resulting in no water circulation. Will upload a pic later

I am just putting on the new pump and will get it running to see how it fares. fingers crossed its solved - hopefully no need for h/g change

[Tony Walker]

fingers crossed for you :-) atleast you have found the cause if the gasket has gone

[Jonny5]

Great news mate, easy fix

[tubbyG]

it seems I wasnt so lucky

while running the engine to check temps the idle was pretty bad, it was very rich (10-11 afr) no mater how much I adjusted it and had the odd hesitation. Running temps were great though.

Im guessing that there was coolant getting into the cylinder/s causing a weak burn making it so rich.

so I have just removed the h/g but cant see any obvios signs of damage, but will get a pic up later. Just going to put in the new gasket, put it back together and see how it goes

[tubbyG]

sucess!!! I have changed the h/g, waterpump, head-bolts, oil & filter and the 5 runs again! sweet as a nut too!
here is a pic of the offending waterpump and the shiny new replacement

the wheel was completley detatched from the shaft and as you can see, part of the wheel was missing....dont think it liked 7k rpm


Im no expert but was unable to see any obvious damage to the h/g, but its changed now and fixed so wont upload a pic just now.

ps....lowered the boost again to keep me safer!

[Nottswoody]

Good news bud but what boost was you runnin? Just one thing how old was te pump?

[tubbyG]

I have no idea on the age of the pump mate, was on the last engine when I bought the car (3 years ago). As it was running as it should I never felt the need to replace it - how wrong was I

I had the carb set to run 22psi on a T28, but I had lowred it to 20psi untill I had det monitored. Now its down to a rich 18psi

[Tony Walker]

Lambda sensor measures the oxygen content in the exhaust so a misfire would show as a very lean mixture because of the unburnt oxygen regardless of how much fuels dumped in. Glad its sorted for you though