viscous fan/80 series

Submitted: Wednesday, Nov 19, 2003 at 15:50
ThreadID: 8624 Views:2230 Replies:4 FollowUps:7
This Thread has been Archived
just finished reading some of the overheating troubles in forum archive and can fully understand the frustration it can cause. i too have an 80s that overheats while towing our caravan up long slopes (into the red and beyond!!!!) and have figured that part of the problem is the viscous fan free-wheeling when the temp rises, to prove this i stuck my hand in the fan with the engine at idle after it over heated and stopped it moving no worries, as a mechanic i know that this isn't right. A trick ive picked up along the way is to remove and split the viscous coupling, clean out all the oil from inside and then fill with silastic, connect it all back together and your'e fan will now drive all the time, sounds a bit loud though (much like a plane taking off, but better than overheating in the middle of no-where). this is just a temp. fix and at the first chance i will be replacing the fan ($350)
Back Expand Un-Read 0 Moderator

Reply By: Member - Bradley- Wednesday, Nov 19, 2003 at 15:55

Wednesday, Nov 19, 2003 at 15:55
If you are near a toyo dealer get the replacement viscious gel , they will tell you to buy 2 bottles, but put three in and it will be like new again . Moo... everyone knows what a Jackaroo looks like :-)
AnswerID: 37827

Follow Up By: Member - Bradley- Wednesday, Nov 19, 2003 at 15:58

Wednesday, Nov 19, 2003 at 15:58
just remembered , had the fun clutch sieze on my zl fairlane once and solid drive it all the time, holy hell what a roar that was LOL Definetly not an enjoyable long drive home :-)Moo... everyone knows what a Jackaroo looks like :-)
0
FollowupID: 27427

Reply By: Member - Eric- Wednesday, Nov 19, 2003 at 21:05

Wednesday, Nov 19, 2003 at 21:05
i did the fluid replacement in mine , and only laster 6 months Venus Bay
AnswerID: 37854

Follow Up By: wes - Thursday, Nov 20, 2003 at 12:03

Thursday, Nov 20, 2003 at 12:03
what was the result after the 6 months?
0
FollowupID: 27499

Follow Up By: Member - Eric- Thursday, Nov 20, 2003 at 17:12

Thursday, Nov 20, 2003 at 17:12
Just went back to the way it was , no fricksion when hot , so I just replaced it , work fantastic now lol Venus Bay
0
FollowupID: 27517

Reply By: Outnabout David (SA) - Thursday, Nov 20, 2003 at 09:27

Thursday, Nov 20, 2003 at 09:27
Wes,

You don't say whether it is Petrol or diesel. The bottom line to all these overheating problems is that there is something wrong! When the car is new it didn't overheat so rather than skirt the issue why don't yoy find the cause.
Has the radiator been removed and cleaned out at a radiator repair place in the last year or so. Is the coolant regularly replaced with the proper coolant.. not the $5 premix cordial type stuff, has different coolant been used over time? Is the t/stat the genuine one or and of the shelf one size fits all? Has the head got fine cracks.....a problem with some early diesels. Is the water pump a genuine Toyota pump. I have seen aftermarket ones with impellers half the size of original! You can get genuine pumps for about $130 so why bother with aftermarket.

There are other things that can be looked at but it never ceases to amaze me how people want to lock upfans etc when the vehicle went oK from new.We have so little time to enjoy our land
AnswerID: 37900

Follow Up By: wes - Thursday, Nov 20, 2003 at 12:02

Thursday, Nov 20, 2003 at 12:02
the cars a diesel (1hz engine) and only done 150k, i've been driving and working on these in the mines for 10 years and i've noticed that pretty much all get pretty hot when they start working too hard for too long, especially when they are towing heavy loads, like our van- 1.6 tonne, when the car only weighs in at 1.985t, a lot of weight to pull up a hill. i don't think theres a serious problem with the car, it had a major toyota service only 3 months ago which included coolant change and its never had any trouble before when towing, i think its just a lot of weight and the cooling system has trouble keeping up, the fans probably not helping either. ive read some of the forums about rigging up water sprays into the radiator to help the cooling when towing and am thinking about doing the same thing, a little splash when going up long hills could make all the difference
0
FollowupID: 27498

Follow Up By: Outnabout David (SA) - Thursday, Nov 20, 2003 at 15:22

Thursday, Nov 20, 2003 at 15:22
Wes,

My point exactly,! You said "i don't think theres a serious problem ...... and its never had any trouble before"

That in itself says that you should find the cause. How long before the last coolant change was the radiator cleaned (not flushed) by a rad specialist? What sort of coolant was in there before and what sort now? If different coolants are mixed even in small quantities it can cause a lot of sludge.

All you gotta do is find the real problem anjd fix it.We have so little time to enjoy our land
0
FollowupID: 27513

Follow Up By: wes - Thursday, Nov 20, 2003 at 19:28

Thursday, Nov 20, 2003 at 19:28
another cause could be the bottom radiator hose collapsing on itself and restricting the coolant flow, i had a feel of it today and it doesn't have the coils inside to stop it from collapsing so i guess thats something else to look at
0
FollowupID: 27531

Follow Up By: Outnabout David (SA) - Thursday, Nov 20, 2003 at 20:44

Thursday, Nov 20, 2003 at 20:44
WEs,

Not many hoses have the coils in theses days and certainly not on Toyota's but the rubber could still be soft. I would say that most problems come from a blocked core. If it hasn't been cleaned in a few years that should be one of the starting points.We have so little time to enjoy our land
0
FollowupID: 27537

Reply By: Member - DOZER- Thursday, Nov 20, 2003 at 21:20

Thursday, Nov 20, 2003 at 21:20
Gday
There are many reasons why a motor will run hot. The 1hz seems to suffer from bad fans. New oil will leak out like the original did eventually. To see if it is the fan put cardboard infront of the rad and wait till the fan kicks in about 1/2 gauge, no kick in, no workies.
To look at it another way, friend with 1hz that liked to get hot on hills with trailer on the back, put vl commodore electric fan infront of air cond condensor, when temp went up, he turned it on and down she came, aswell as that he froze cause he had air on aswell...lol
My 1fzfe almost overheated on a long pull (Nelligen to Braidwood) with van on the back. auto 1fz, hot summer day, van,first gear all the way, 40km/hr temp was just under the red when i wound down the windows and turned the heater on...needle went down 2 thicknesses, and stayed there till we got to the top...(so we could pull over) Might help someone one day:-)
Andrewwheredayathinkwer mike?
AnswerID: 37960

Sponsored Links

Popular Products (13)