Checks, in order
- Clean and find the real sourceDegrease the front of the engine, drive a short distance and look for the first fresh oil. Oil runs down, so the source sits above the lowest wet spot. Dye helps if the area is complicated.easy $ · under about $50
- Look at the cover junctionsCheck where the cylinder head meets the timing cover at both banks, especially the top corners. A seep there points to the cover sealant rather than a seal.easy $ · under about $50
- Rule out simpler leaksCheck the valve cover gaskets, oil filter housing, oil pressure switch and oil pan edges. These are cheaper to fix and can drip down onto the timing area.easy $ · under about $50
- Outside seal as a stopgapSome owners clean the area and apply gasket maker or RTV over the joint. This can slow or stop a small seep but isn't the same as a full reseal.medium $ · under about $50
- Reseal the timing coverThe proper repair removes the cover and reapplies sealant. It's a labor-heavy job; many owners replace the water pump and other front-cover parts at the same time while it's open.hard $$$ · shop-level job, $500+
Applies to: 2005 to 2015 Tacoma with the 2TR-FE 2.7L four-cylinder and 1GR-FE 4.0L V6, 2WD, PreRunner and 4WD. Both engines use timing chains and a serpentine-belt-driven water pump.
Tools and parts for these checks
Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.
| ITEM | USED FOR | BUY |
|---|---|---|
| UV leak detection kit | Pinpointing exactly where a leak starts | Shop on Amazon |
| Engine degreaser | Cleaning the area so the leak shows up | Shop on Amazon |
| Bluetooth OBD2 scanner with live data | Reading and clearing codes and watching live sensor data | Shop on Amazon |
Go deeper
More 2nd Gen Tacoma problems
- Frame rust: flaking, holes or a soft frame (Frame & Body)
- Rear sag, squeaks or a cracked rear leaf spring (Steering & Suspension)
- Clunk, knock or rattle going over bumps (Steering & Suspension)
- Steering feels stiff, rattles or wanders (Steering & Suspension)
- Shaking, shimmy or violent wobble at highway speed (Steering & Suspension)
- Humming or rumbling from the front that changes with speed (Front Axle)
All 16 2nd Gen Tacoma symptoms in the interactive troubleshooter →
General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.