Timing Chain And Chain Tensioner; Timing Chain Cover - Toyota FJ GSJ10 Technical Manual

3. Timing Chain and Chain Tensioner

" Both the primary and secondary timing chains use roller chains with a pitch of 9.525mm (0.375 in.).
" The timing chain is lubricated by an oil jet.
" The primary chain uses one timing chain tensioner and each of the secondary chains for the right and left
banks uses one timing chain tensioner.
" Both the primary and secondary chain tensioners use a spring and oil pressure to maintain proper chain
tension at all times. They suppress noise generated by the timing chains.
" The chain tensioner for the primary chain is the ratchet type with a non-return mechanism.
Chain Tensioner (Secondary)
Ball
Main Spring
Plunger
Spring
Cam Spring
Chain Tensioner (Primary)

4. Timing Chain Cover

The timing chain cover has an integrated construction consisting of the cooling system (water pump and
water passage) and the lubrication system (oil pump and oil passage). Thus, the number of parts is reduced
to reduce weight.
Timing Chain Cover
Water Pump Gasket
Water Pump
View from Front Side
ENGINE — 1GR-FE ENGINE
Chain
Slipper
Plunger
Cam
Oil Passage
Water Pump
Swirl Chamber
Chain Tensioner (Secondary)
Primary Chain
Timing Chain Cover
Oil Pump Rotor
Oil Pump Housing
View from Back Side
Secondary Chain
Chain Damper
Oil Jet
0240EG07C
Oil Pump Chamber
238EG23