engine

Timing Chain Tensioner

for 2021 Toyota Camry 2.5L I4 · FWD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Lexus & Toyota Mechanic · 20+ years

Difficulty

Advanced

Time

6.0 h

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

Replace the timing chain tensioner on the 2018-2024 Toyota Camry 2.5L I4 engine to restore proper timing chain tension and eliminate chain noise or timing issues.

Warnings

⚠️Engine must be cold before starting this procedure. Hot components can cause severe burns.

⚠️The crankshaft pulley bolt requires very high torque. Ensure tools are properly rated and positioned to prevent injury.

⚠Timing chain alignment is critical. Even one tooth off can cause engine damage or failure to start.

⚠Do not rotate the crankshaft with timing chain tensioner removed unless absolutely necessary, as chain slack may cause timing to jump.

ℹ️Take multiple photos of timing mark alignment before disassembly for reference during reassembly.

Tools required

Socket set (10mm, 12mm, 14mm, 17mm, 19mm)Essential

Torque wrench (0-200 Nm range)Essential

Crankshaft pulley holding toolEssential

Engine support fixture or jack with wood blockEssential

Timing pin or 3mm wire for tensioner pre-loadEssential

Plastic scraper for gasket surfacesEssential

Breaker barEssential

Dial indicator with magnetic base

Flashlight or inspection lightEssential

Oil drain panEssential

Ratchet extensions (3-inch and 6-inch)Essential

Parts

Timing chain tensioner assembly × 1 — Use OEM specification
Timing cover gasket × 1 — Use OEM specification
Valve cover gasket × 1 — Use OEM specification
Valve cover spark plug tube seals × 4 — Use OEM specification
Crankshaft pulley bolt (if reusing is not recommended) × 1 — Use OEM specification
Engine oil × 1 — Toyota Genuine 0W-20
RTV silicone sealant (Toyota Genuine or equivalent) × 1 — Use OEM specification

Fluids

Toyota Genuine 0W-20 — 5 qt

Preparation

Ensure engine is completely cold to the touch
Disconnect negative battery terminal and wait 90 seconds for airbag system to discharge
Remove engine cover by pulling upward on clip attachments
Raise vehicle and secure on jack stands if needed for access from below
Drain engine oil into appropriate container
Remove right front wheel and inner fender liner for crankshaft pulley access
Photograph or mark all timing chain alignment marks with paint marker before disassembly

Procedure

1
Remove valve cover
Disconnect ignition coil connectors and remove all four ignition coils. Disconnect PCV hose and any vacuum lines attached to valve cover. Remove valve cover bolts in reverse of tightening sequence (start from outside, work inward). Carefully lift valve cover off, using plastic tool to break gasket seal if needed. Inspect gasket and replace if damaged.
2
Support engine and remove right engine mount
Place engine support fixture across engine bay or position hydraulic jack with wood block under oil pan to support engine weight. Remove right engine mount bracket bolts and mounting bolts. Remove entire right engine mount assembly to gain access to timing cover.
⚠Ensure engine is properly supported before removing mount. Engine will shift when mount is removed.
3
Remove crankshaft pulley
Remove serpentine drive belt by rotating tensioner clockwise and sliding belt off pulleys. Install crankshaft holding tool to prevent rotation. Use breaker bar to loosen crankshaft pulley bolt (counterclockwise). Remove bolt completely and pull crankshaft pulley straight off crankshaft using appropriate puller if necessary.
⚠This bolt is extremely tight. Use proper size socket and ensure holding tool is secure to prevent component damage.
4
Remove timing cover
Disconnect crankshaft position sensor electrical connector. Remove sensor mounting bolt and sensor. Remove all timing cover bolts, noting the different sizes (8mm and standard). Carefully separate timing cover from engine block, using plastic scraper if needed. Clean all gasket material from timing cover and engine block mating surfaces thoroughly.
ℹ️Keep track of bolt locations as different length bolts are used in specific positions.
5
Verify timing alignment and mark
Rotate crankshaft clockwise to Top Dead Center (TDC) position for cylinder #1. Verify timing marks on crankshaft sprocket and camshaft sprockets align with marks on engine block and timing chain guides. The colored chain links should align with marks on sprockets. Take clear photos from multiple angles. Mark chain position relative to sprockets with paint marker if colored links are faded.
⚠️Accurate timing mark verification is critical before removing tensioner. Document everything thoroughly.
6
Remove timing chain tensioner
Locate timing chain tensioner on front of engine block (driver side). Remove timing chain tensioner bolt. Carefully pull tensioner straight out from engine block. Inspect tensioner for wear, scoring, or oil leaks. Verify chain guides are not excessively worn or damaged.
⚠Once tensioner is removed, do not rotate crankshaft unless absolutely necessary as timing may jump.
7
Prepare and install new tensioner
Remove new tensioner from packaging and inspect for damage. Compress tensioner plunger fully by hand or using soft-jaw vise. Insert timing pin or 3mm diameter wire through hole in tensioner body to lock plunger in compressed position. Apply small amount of clean engine oil to tensioner plunger and mounting surface. Install tensioner into engine block, ensuring it seats fully. Install and hand-tighten tensioner bolt.
ℹ️Do not remove locking pin yet. Pin must remain in place until after timing cover installation.
8
Verify timing and prepare for cover installation
Double-check that all timing marks still align correctly with marks made during disassembly. Verify crankshaft is still at TDC for cylinder #1. Inspect timing chain for any tight spots or binding. Clean all gasket surfaces on engine block and timing cover with plastic scraper, then wipe with clean lint-free cloth. Apply thin bead of RTV sealant to specified areas of engine block where timing cover meets oil pan and cylinder head.
ℹ️Install timing cover within 10 minutes of applying RTV sealant for proper seal formation.
9
Install timing cover
Position new timing cover gasket onto engine block, aligning all bolt holes. Carefully position timing cover onto engine, ensuring crankshaft nose enters cover seal properly and cover seats flush against block. Install all timing cover bolts finger-tight, starting with center bolts and working outward. Tighten bolts in sequence (center to outer pattern) to specified torque, noting 8mm bolts require different torque specification than standard bolts.
ℹ️Ensure cover is fully seated before tightening bolts to prevent gasket damage or leaks.
10
Release timing chain tensioner
After timing cover is fully installed and torqued, carefully remove the locking pin or wire from timing chain tensioner. You should feel resistance as the tensioner plunger extends to apply tension to chain. Rotate crankshaft clockwise by hand two complete revolutions and verify timing marks realign at TDC. If marks do not align, disassemble and correct timing before proceeding.
⚠️If timing marks do not realign after two full rotations, DO NOT start engine. Timing is incorrect and must be corrected to prevent severe engine damage.
11
Install crankshaft pulley and sensor
Clean crankshaft nose and inside of crankshaft pulley. Align pulley keyway with crankshaft key and slide pulley onto crankshaft. Install new or reused crankshaft pulley bolt (consult service manual for reuse limits). Use holding tool to prevent rotation and torque bolt to specification using torque wrench. Install crankshaft position sensor with new O-ring if provided, and torque sensor bolt to specification. Reconnect sensor electrical connector.
⚠Crankshaft pulley bolt is a critical fastener. Ensure accurate torque application and consider replacement if manufacturer specifies torque-to-yield design.
12
Reinstall right engine mount
Position right engine mount assembly back into place. Install mounting bolts and torque to specification. Remove engine support fixture or jack. Verify engine sits properly in mounts without binding.
13
Install valve cover
Install new valve cover gasket and spark plug tube seals onto valve cover. Apply small dab of RTV sealant to corners where timing cover meets cylinder head (consult service manual for exact locations). Position valve cover onto cylinder head and install bolts finger-tight. Torque valve cover bolts in sequence (center outward pattern) to specification. Reinstall ignition coils, torquing bolts to specification. Reconnect ignition coil connectors and PCV hose.
14
Complete reassembly
Install serpentine drive belt onto all pulleys, ensuring proper routing per underhood diagram. Reinstall inner fender liner and right front wheel if removed. Torque wheel lug nuts to specification. Reinstall engine cover. Fill engine with correct quantity and specification of engine oil. Reconnect negative battery terminal.

Reassembly

Ensure all electrical connectors are fully seated and locked
Verify serpentine belt is properly routed and seated on all pulleys
Double-check that all bolts have been reinstalled and torqued to specification
Confirm no tools or parts were left in engine bay

Verification

Before starting engine, rotate crankshaft by hand two full revolutions to verify smooth rotation and proper timing mark realignment
Check for any fluid leaks around timing cover and valve cover before starting
Start engine and listen for abnormal noises, particularly chain rattle or knocking
Allow engine to reach operating temperature and verify no coolant or oil leaks
Verify check engine light does not illuminate and no timing-related codes are present
Road test vehicle and confirm normal engine operation under various load conditions
Recheck engine oil level after test drive and top off if necessary

🔧Stuck on this timing chain tensioner? Take it to The Diag Desk.A human with 20+ years in the bay answers about YOUR Toyota within 24 hours — never AI. $25, and you're not charged unless you get an answer.Ask a tech →