Engine Getting Hot!

[madspikes 41 1 Cars]

I have the 205 back on the road for the first time in a couple of years. There are couple of little issues, and a major one, with the major being that the engine is getting hot and not cooling correctly.

 

I changed the thermostat, and that seemed to make little or no difference. The main rad is getting warm but not as hot as I would expect, it just doesn't seem right. My major concern is the oil temp, it hardly ever use to move very much on the dial, and now its almost at the 1 o'clock position after a 20 minute drive. The oil level is smack between the two marker on the stick and pressure looks OK. Any ideas?

 

Water pump failure? - How would I tell without stripping it out?

Oil Pump issues?

 

I'm at a loss, and I just want to drive the thing and not start stripping at down again!

 

If it keeps this behavior up, it going to find itself with a for sale sign on it! GRRRR

 

Clive.

 

 

 

[selfyyy 4 1 Cars]

Is the fan coming on?

[madspikes 41 1 Cars]

I have manually operated fans and with them on the engine is staying at around 90c with the car moving. Its the oil temp with is spooking me the most.

[Tom Fenton 1,542]

Are you sure the new thermostat isn't a dud?

 

I had the thermostat stick near shut on my red turbo car, on gentle cruise it was OK but as soon as the engine was making any power it would get hotter rapidly.

 

As an easy trial you could pull the stat, cut the middle out of the old one and put that in to test.

[madspikes 41 1 Cars]

Good call that man.

[SkyQuake 70 1 Cars]

Doesn't the water in the system constantly cycle back through the header tank? If you take the filler cap off (when the system is cold!), you should see water moving (bubbles and sloshing) through the header tank if the pump is functioning.

[jackherer 543]

Yes, coolant should be returning to the header tank through one of the hoses on top. Rev the engine while you are checking and flow should increase. A problem I've seen on some cars (not 205s) is the flow stopping when the revs build up, this is normally caused by loose plastic impellers spinning on the shaft.

[madspikes 41 1 Cars]

Thanks for all the suggestions....

 

The header tank does get hot, and now that I've flushed the system and removed the centre of the thermostat the whole system gets properly hot. The oil temp seemed to increase as well, but only to the first bar during warming the engine. The oil probably was already partly warm. Need a proper test run to confirm what is now going on.

 

I dunked new stat in boiling water from the kettle and it opened, not a massive amount around 2mm I guess.

 

What I did notice is that my twin after market fan setup didn't do much of a job of reducing the engine temperature, I'm sure they use to! Both are spinning, grrrr further investigation required!

 

Clive.

Edited April 21, 2015 by madspikes

[welshpug 1,661]

are they solid mounted? I;ve seen DCC's fans stop working as the rad got hot due to twisting the fan, when tested via the ecu on a cold rad they span up fine!

[pug_ham 244 3 Cars]

What I did notice is that my twin after market fan setup didn't do much of a job of reducing the engine temperature, I'm sure they use to! Both are spinning, grrrr further investigation required!

Are your fans turning in the correct direction to pull air in & through the rad?

 

Spinning the wrong way will mean they are pretty much useless.

 

g

[madspikes 41 1 Cars]

The knobbled stat allows the car to be kept cool. The oil temp came up to around 70 to 90c which is more than I remember but isn't excessive I don't think. I'm also not running a oil cooler.

 

Cooling fan are on correct way, or should be ;-) - always worth the obvious!

 

Plan of attack - renew main rad its very crusrty and seen better day. Drop the sump and check the oil pump for crud.

 

Clive

[Tom Fenton 1,542]

Don't waste your time on the oil pump. Knackered oil pump = no pressure, if you have pressure then its OK.