Symptoms
Ticking from the top end, oil weeping down the block, or poor running from tight valves.
The fix, step by step
- The F engine has adjustable rockers, and the procedure is the same as on an early FJ40.
- Warm the engine, find tight and loose valves with go/no-go feeler gauges, then shut it off and adjust cylinder by cylinder with the intake just closed.
- Use the clearances in your manual.
- Fit a new cork gasket: the IH8MUD FJ25 part list gives Toyota 11253-60010 for the original cover gasket.
Tools & part numbers
- Feeler gauges
- 17 mm wrench
- screwdriver
- new gasket
Where to buy the parts
Valve cover gasket, F engine 1958–74 (confirm FJ25 fit)Cruiser Corps ↗Amazon ↗
Valve stem seal, 1958–67 O-ring type (050-05A)Specter Off-Road ↗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.