Isuzu Trooper Owners Club UK™

jamie g · ** Joined: 28 Dec 2007 Posts: 64 Location: worcester

hi guys took the other half to work this morning and school run for the kids when i noticed a funny whirling noise when pulling through the traffic. on checking when i got back home i think i have found where the noice is coming from.

the viscous seams to be rattling abit. when i go down to grill hight it sounds horrid. as anyone else had this problem and how hard is it to replace. cheers

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Browndoff · Posted: Fri May 02, 2014 10:48 Post subject:

They're VERY simple units! If it's rattling, it's actually more likely that it's the Water-Pump-bearing that has 'bitten the dust'. To check this, loosen the belt-drive by loosening the slider-bolt on the Alternator [and the pivot-bolt at the back] and taking the tension out of the drive-belt. Then try to 'wiggle' the fan by the fan-blades.

If only the fan itself moves - then it's just because the M6 attachment-bolts have become loose - just tighten them up!

If the fan and the pump-shaft-pulley to which it's attached also move - then it's the bearing - so you've got to work on the Water-Pump itself.

I'd be very surprised if the rattle were within the Fan-Clutch itself - as it's a well-sealed unit - but I suppose ANY thing can fail! If you DO have to replace the Aisin Fan-Clutch unit, they can usually be acquired in good condition as 'used' parts - either from a Trooper or from a Toyota - who get their units from the same supplier.
_________________
2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc.

Rhanagar · Posted: Fri May 02, 2014 12:07 Post subject:

Which Toyota? AYGO maybe??? Bit like saying any Woolfrace alloy wheel will fit as they make for all cars ... even if you try fitting one off a Smart car. Rolling Eyes

I seriously doubt wether any Toyota Fan would fit to be honest. Stick with Trooper. You haven't mentioned engine so just for interests sake:

Use a 3.1 fan on a 3.1. You can fit a 3.1 fan onto a 2.8, but you will have to remove the fan cowl.

As Browndoff says it could be the waterpump, it could also be the power steering pump, air-con pulley, alternator, or as you say the fan.
_________________
1990 Isuzu Bighorn LWB Mk.I 2.8TD Manual Lotus Edition
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto Lotus Edition

Deceased
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto LS

Grandad · ******* Joined: 22 Sep 2005 Posts: 1902 Location: NORFOLK

When a viscous fan is on its way out it makes quite a distinctive noise best described as a tinging sound unlike any sound that belts pumps or alternators make and must be sorted straight away as have a habit of breaking up and going into the radiator quite common on fords in the late 60'searly 70's V4's and v6's

jamie g · ** Joined: 28 Dec 2007 Posts: 64 Location: worcester

Cheers guys this is a rumble more then a tink rink nose ) guessing your right its the water pump on the way out. Only changed it a couple of years back. Best get it sorted I dont wanr it going south uncase it hits the rad. Which I only replaced last year

BoltsnNuts · ** Joined: 03 May 2014 Posts: 73

Also best not to drive it like that at all.
Can make a right mess and take all manner of hoses/pipes/rad with it.
If you need to move it a few yards, disconnect the belt,
BUT ONLY FOR VERY SHORT AND WATCH THE TEMPERATURE.

Browndoff · Posted: Thu May 08, 2014 23:25 Post subject:

Rhanagar I can't remember WHICH Toyota it was [but I THINK it was the Hilux]. I was looking for information on the Aisin Viscous-Clutch type Fan and came across an American Toyota website recommending a specific viscosity of replacement-oil available from Toyota dealers [to improve the viscosity of the oil and, hence, the low-speed and low-temperature performance of the coolant-fan]. The important point is that this site was describing the very same model of Aisin clutch driving a similar fan on a similar-powered vehicle - with an easy-to-execute solution for the problem of poor performance of the fan.

Jamie Whatever you think might be wrong - DON'T go buying parts to 'try-out' as a solution! First, at least, remove the fan-belts and try to 'rattle' the bearings of each of the pulleys connected by them. Since the problem is already at the noisy-bearing stage, it's very likely that you'll be able to SEE real movement of the pulley which is running on the bad bearing - but NOT on the others which are still OK. Likewise, as I said before, if the FAN moves but the underlying water-pump pulley is STEADY - don't go blaming the water-pump!
_________________
2002 LWB Trooper 3.0L
I've done some major repairs, including replacing half-shaft, replacing fuel-injectors etc.

Rhanagar · Posted: Fri May 09, 2014 6:56 Post subject:

Thats interesting Brondoff ... I know a couple of people with Yota's will look into it.

Jamie

Noise does travel in the engine bay. PLaces to look for movement is the power steering pump pulley, steering idler/air-con pulley, and water pump pulley (which the fan is bolted to). I would be doubtful about the fan viscous unit going, but I could be wrong.
_________________
1990 Isuzu Bighorn LWB Mk.I 2.8TD Manual Lotus Edition
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto Lotus Edition

Deceased
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto LS

Rhanagar · Posted: Fri May 09, 2014 6:57 Post subject:

*browndoff even .. apologies.
_________________
1990 Isuzu Bighorn LWB Mk.I 2.8TD Manual Lotus Edition
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto Lotus Edition

Deceased
1994 Isuzu Bighorn LWB Mk.II 3.1TD Auto LS