Viscous fans - a few quick checks to prevent overheating 

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Hi Robert! I don't know what it is, but these fans last better on every vehicle except for Defenders I guess we are just lucky that way! Mike

Any time!

Thanks Fionàn! But at £31 it is cheap insurance for a new unit! Mike

I was in central Australia 20+ years ago and indeed it does get a tad warm - in fact I had to undo my top button on my shirt! LOL! This is the second time I have read in my comments about the Engine Watch Dog - I may have to investigate further. Thanks for the comment! Mike

No problem but I have to ease back on replying to all comments ( as there are quite a lot now) and try and reply to good questions so that others can learn

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Thank you Juan Mike

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Get an genuine hot temperature thermostat which will not only open at a lower temperature but also open at lower pressure. The original is designed to provide lots of cabin heater performance at the expense of engine cooling performance at idle. You want the genuine pel500110 part. The correct part is grey and not white or black. Don’t bother with any of the aftermarket units. I changed mine five times before I found the right solution.

Thanks Allan! Mike

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@@BritannicaRestorations Well... I have a strong motive ... I’m getting a Landy here in Germany, but lucky me... I watched your videos sir 😜👍🥳

Thanks I fitted a twin fan system to my 3.9 Isuzu in the Defender as I was running out of space - works well and I got the override switch with the kit But at only £31 for a new viscous unit, electric fans are quite a luxury Mike

I have lost count of the number of radiators with little or no fins - but do not leak!

Sounds great!

Hey. Naeza get wapi hizi viscous coupling clutch ya navara

Thermostat? Water pump? Bad radiator?

Julio - if the cooling system is in good order then you should be fine - but pay attention to the radiator core -- it may not leak, but the fins get all rotten and thus will not cool Mike

Thank you - glad it was informative! Mike

That would not be the first time someone has drilled it!

you should be able to power wash the bimetallic spring when it is of the vehicle I have used this style fan on my Defender conversions www.revotec.com/

To be honest I have not that much experience with Td5 here in Canada as all vehicle have to be over 15 years for import and those that do import usually bring in 300Tdi Have you got an EGT sensor and gauge fitted? If the vehicle is old I would check the fan is working - the couplings are cheap, but if not locking up can cause overheating as air flow can be reduced when slowly pulling hard up hills - just when you really need max air flow Around town, there is low airflow, but the engine is not working hard Just a thought Mike

Yes quite normal - sounds as if you have a Kenlow fan system Mike

I'm not sure

Big US pickup trucks have massive radiators but always at the back if the transmission cooler, A/V condenser, Steering cooler and engine oil cooler, so you are right the rad picks up all the heat exhausted by these other coolers - but the rad is very large to compensate, where a 300 Tdi is stil the same rad As an interesting foot note, the HS2.8 conversion retained the 300Tdi rad, but it was too small for towing or mountain work - I used to put stationary engine cores in which had an extra row of tubes and that worked fine Mike

OEM is always the best choice, but I believe for the radiator it is copy (China) or genuine - and Genuine are very expensiveAs for the fans - the copy ones are made in Taiwan, the OEM in the UK Mike

@Britannica Restorations Ltd do you replace the oil in the fans or just replace the hub?

Get a new unit - they are pretty cheap now

Cheers. Id rather investigate further to see what's going on. I've put a spare one on for now. Im not fond of leaving mysteries unsolved haha!

Not possible to repair

Saw someone do something similar with a Roll Royce Shadow 2 many years ago - sat in the drive revving it up listening to the motor - then snapped the fan pulley - the bonnet was open - but that WAS expensive to fix - if I remeber the 2 x matching fan belts were well over £100 a pair 30 years ago!

Hmm - guess I'll forget about trying that on my Disco 1.

You cannot get them apart with out destroying them

@@BritannicaRestorations Well that sucks. Oh, well, off to buy another one. Once I get a new new one, I guess I will destroy this one.

They are not all that expensive - I throw all mine in the scrap furnace!

That's the way it said on my boxes - funny old world!

@@BritannicaRestorations maybe when new it cant or doesn't flow out of the reservoir .When it's been used its all out in the clutch

Sounds like it!

is the thermostat ok?

@@BritannicaRestorations just ordered a new one. i will remove the old one and test it in a pan and replace if necessary. will probably replace it anyway. Also my tdi300 was fitted aprox. 2 inches towards the rear of the vehicle so the fan is not actually inside the cowling. do you think this might affect?

Could be a bad thermostat

I saw this the other day www.landroverexpedition.com/technical/300tdi-low-coolant-alarm/ Mike

Britannica Restorations thanks mine didn't have the resistor that might make it work the right way round!

Did you use the circuit as in the link I sent you? Mike

Britannica Restorations I hadn't seen this till you sent it I didn't included a transistor in mine so I couldnt get the relay to trip I'll be modifying my set up to match the link

I think I will make a couple - seems easy enough And the sensors have come way down in price - but the are $170 each in the US! About £17 in the UK Mike

If it does not 'lock' when hot then it is done = try a hot air gun on the bimetallic spring and see if there is a difference in resistance

It'll take centrifugal force to move the silicone oil in to place surely? To test it that way you'll have to heat it while it's running

if you start it cold and rev at 2000ish it should be quite loud and blow heaps then after 30 second or a minute it should go quiet.

If you can stop it when it is hot with a bit of wood then it is bad - they usually are

Good question! I know they have to be stored horizontal, but didn't give it much thought as to being on the vehicle a long time! I will think about that! Mike

@@BritannicaRestorations I hav been told that a new fan van be stored any direction, BUT a used one should be stored vertical .

I don't know I always lay them flat

Cost?

The iveco daily uses an electro mechanical clutch also, works really well

Nice beer - but not 'guzzling beer' like us Brits are used to! LOL!

I think Land Rover rested on their laurels back in the 60's with the success of the original Land Rover and just churned out vehicles as there was no competition. When the Japanese came along, LR were playing catch up and they churned out vehicles which the public test drove - that never happened with the Japanese - they made 100% sure they had a cheaper, more reliable product. I cannot understand how LR has not had major class action law suits against them for problems the KNEW existed for years The Japanese vehicles did suffer from high corrosion, but they were cheap, and nothing left the factory with a known issue hoping it would go away But then again - maybe it was deliberate, keeping 1,000s of mechanics in employment all over the world -you never know. LOL! Mike