Symptoms
Weeping from the pump weep hole, a growling bearing or wobble at the fan.
The fix, step by step
- New early pumps are hard to find, so owners rebuild the original.
- One IH8MUD member found that the early pump bearing (Toyota 90369-30008, cross-referenced as Koyo 885141 / FAG W2503) is the same bearing used in the Willys Jeep pump, and that Jeep rebuild kits (BB707) supply the bearing and seal.
- Others send pumps to a water-pump rebuilder; one member reported about $125.
- Fit a new bypass hose while it's apart.
Tools & part numbers
- Puller
- press
- gasket scraper
- Willys-type rebuild kit or professional rebuild
Where to buy the parts
Water bypass hose, OEM (1958–87)Specter Off-Road ↗Amazon ↗
Thermostat, OEM/Aisin (1958–92 F-series; confirm FJ25 fit)Cruiser Corps ↗Amazon ↗
Upper thermostat gasket (1958–92)Cruiser Corps ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Toyota Land Cruiser J20 / J25 (FJ25) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.