1HZ motor overheating- possibly fan clutch drive?

Submitted: Wednesday, Jul 01, 2009 at 18:48
ThreadID: 70308 Views:12429 Replies:10 FollowUps:9
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Hi all,
I was wondering if anybody has heard of the landcruiser 1HZ fan clutch drive causing the motor to overheat?
I have replaced my radiator and inhibitor with a new 12 months ago, recently installed new hoses, new thermostat.
I have had this overheating problem over the past 12 months, but only when travelling at a constant speed of 100kph. The temp gauge rises to about 80%, comes down, then rises at random times, no matter what the outside conditions are.
I was talking to a couple other blokes who have experienced or heard of the clutch drive being the problem when it gets old, they said pull it off and tip in an additive to help the oil.
I pulled it apart (the fan was tight to spin)and found the oil in the unit to be thick, sticky and like honey, so i have cleaned it all out and refilled with penrite trans-axle oil. It now spins freely, just need to test drive.
So was just wondering if anybody has had any experience like this?
Thanks for your helpful replies.....
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Reply By: mechpete - Wednesday, Jul 01, 2009 at 18:54

Wednesday, Jul 01, 2009 at 18:54
gooday brian ,
yes its a common problem .sometimes even new viscous fan hubs do not have the correct oil capacity , don,t put transaxle oil init by the correct oil and put a bit more than recomended .a bit trial an error .
cheers mechpete
AnswerID: 372667

Reply By: Roughasguts - Wednesday, Jul 01, 2009 at 19:23

Wednesday, Jul 01, 2009 at 19:23
The viscous fan don't do much at 100kph, it does all it's work at idle or putting around.

Anyway it's possible you have a Head gaskett leak and that is causing the over heat condition.

Good luck hope it's not the Head gaskett, there not much fun to replace.
AnswerID: 372671

Follow Up By: Brian B (Mackay Qld) - Thursday, Jul 02, 2009 at 15:37

Thursday, Jul 02, 2009 at 15:37
I can see any tell-tail leaks from the head gaskett, its not loosing inhibitor.
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FollowupID: 640028

Follow Up By: Brian B (Mackay Qld) - Thursday, Jul 02, 2009 at 15:37

Thursday, Jul 02, 2009 at 15:37
ooops, 'Cant' see any leaks
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FollowupID: 640029

Reply By: get outmore - Wednesday, Jul 01, 2009 at 19:23

Wednesday, Jul 01, 2009 at 19:23
the silicone oil is supposed to be sticky like honey - you get it from Toyota for $12 a tube

a stuffed fan usually gives uissues on hotter days and when the motor is under stress


--------------- I wouldnt drive it far with transaxle fluid and it spinning freely

and yes the fan clutch is a very common cause of overheating
AnswerID: 372672

Follow Up By: Brian B (Mackay Qld) - Thursday, Jul 02, 2009 at 15:39

Thursday, Jul 02, 2009 at 15:39
I thought it was suppose to spin freely when the engine is cold, to reduce noise and save horsepower when not needed for cooling. which is why there is a viscous clutch?
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FollowupID: 640030

Reply By: 120scruiser (NSW) - Wednesday, Jul 01, 2009 at 19:23

Wednesday, Jul 01, 2009 at 19:23
mechpete has got it right.
Go to toyota and get three tubes of the correct gel and put them in. If you use the wrong stuff or too much you could risk the fan clutch coming apart.
BTW is it turboed????
99% of toyota dealers won't know what the hell you are talking about as it will take some effort form them to find the part number.
I used to have a couple of tubes with the part number on it but I must have used them. Sorry.

Scott
AnswerID: 372673

Follow Up By: get outmore - Wednesday, Jul 01, 2009 at 19:55

Wednesday, Jul 01, 2009 at 19:55
P/N 08816-10001
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FollowupID: 639919

Follow Up By: Brian B (Mackay Qld) - Thursday, Jul 02, 2009 at 15:43

Thursday, Jul 02, 2009 at 15:43
no it is not turbo, just factory stock 1HZ 1994 with 189000kms.
Just debating about whether to see how it goes when i have to do a 30km trip on the highway on saturday, or to pull it apart again with new oil, or to just get a new one.
I dont really have much to lose if i test drive on saturday with trans axle oil, i know the exact locations on the highway where it creeps up in temp. so it cant get worse.
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FollowupID: 640031

Follow Up By: get outmore - Thursday, Jul 02, 2009 at 15:55

Thursday, Jul 02, 2009 at 15:55
when the temp starts climbing quickly pull over and pop the bonnet while the 80 is still running. turn off the engine from a position you can see the fan and the fan should stop dead with the motor. if it keeps spinning - even for a short while that is definitly your problem

mine has 270k on it and i have done it twice so far
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FollowupID: 640033

Reply By: cruza25 - Wednesday, Jul 01, 2009 at 20:00

Wednesday, Jul 01, 2009 at 20:00
you can get a new jap fan clutch for about $120 from autopro or other good parts store- dont get the chinese ones as they dont last

i have also heared that 2 big spotties can cause overheating as they restrict air through the grill

cheers

mik
AnswerID: 372681

Reply By: toyotabits .........VKS-737 ...mobile 2629 - Wednesday, Jul 01, 2009 at 20:19

Wednesday, Jul 01, 2009 at 20:19
G'day all, the biggest overheating problem with all Toyota engines is the radiator fan shroud - make sure it is a perfect fit around your radiator & fan, any gaps lessen the cooling. With the fan clutch nothing else will work correctly unless it is genuine Toyota fluid tubes! (in any fan clutch) The fan shroud fit is very important! regards, aussiedingo
AnswerID: 372685

Reply By: Member - Doug T (NT) - Wednesday, Jul 01, 2009 at 20:30

Wednesday, Jul 01, 2009 at 20:30
Stick a new Thermostat in it.... the job is made much easier by laying the A/C compressor to one side .

.
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AnswerID: 372690

Follow Up By: Brian B (Mackay Qld) - Thursday, Jul 02, 2009 at 15:36

Thursday, Jul 02, 2009 at 15:36
I have just put a new thermostat in it, $60 and it has not fixed the problem.
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FollowupID: 640027

Reply By: Member - Roachie (SA) - Wednesday, Jul 01, 2009 at 20:37

Wednesday, Jul 01, 2009 at 20:37
All the previous responses are great, but they've all omitted one important possibility....... the temperature sender unit!!!

These sender units are the cheapest possible item that a manufacturer can get away with and are not designed to show you an exact reading of what the engine temp actually is (hence they don't have any numbers; just C and H...wow that's great, tells me stuff-all).

So, may I respectfully suggest you spend a small amount and fit an aftermarket temp gauge (VDO, Autometer, Speco etc) in addition to the standard Toyota gauge. At the very least, I would go to Toyota and buy a replacement standard temp gauge sender unit, but this still won't tell you what the ACTUAL engine temp is.

Another great option (and easier to fit) would be a TM2 digital readout which also combines an alarm that you can pre-set to a desired warning level up to about 125 degrees or thereabouts.

Cheers

Roachie
AnswerID: 372691

Reply By: Matt(WA) - Thursday, Jul 02, 2009 at 00:43

Thursday, Jul 02, 2009 at 00:43
Brian,

Have a look at thread 41579

Had the same problem. Just replace your viscous hub.

Matt

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AnswerID: 372725

Follow Up By: Dremus - Thursday, Jul 02, 2009 at 11:02

Thursday, Jul 02, 2009 at 11:02
Also had the same problem. I replaced the radiator and thermostat because everyone told me the fan would be doing nothing at 100 km/hr. I replace the viscous hub , 1/2 hr job, and all is fixed.
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FollowupID: 639998

Follow Up By: Wherehegon - Thursday, Jul 02, 2009 at 23:09

Thursday, Jul 02, 2009 at 23:09
HI there Dremus very true what you have said , so many times I have heard people say ""the coupling doesnt need to lock up at freeway speeds"" They do and they will if need be. Even cruising at 100k with fresh air been pushed through the grill to the radiator, if the motor starts to run warm due to high speeds or towing or just a hot day the coupling will lock up and cut the fan in to pull through the extra air it needs to cool the radiator down. I use to be able to hear myn cut in and out on the old hilux, and even the prado I have now...............Regards Steve
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FollowupID: 640113

Reply By: 2517 - Saturday, Jul 04, 2009 at 12:22

Saturday, Jul 04, 2009 at 12:22
Hi I have being down this road,except Toyota is turboed ,fitted a new dual core radaitor sloved the problem.I tow a 20 ft van and had the job done in Darwin the chap told me very common problem up north.There is a company called Desert some thing in Vic who make the right goods.
AnswerID: 373054

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