Timing Belt TENSIONER
NOTE:
The timing belt tensioning mechanism uses hydraulic dampening and a temperature compensation mechanism to reduce belt load and dampen oscillation. See Fig 1. The tensioner roller and carrier is supported against the pull of toothed belt by a push rod and piston on a 7 packet (5 each) bi-metallic diaphragm spring set. Tensioner is filled with engine oil (which is added only after installation on block). Replacement tensioners are not oil filled so oil must be added and unit bled for proper operation. Pockets between tensioner roller housing and engine block are used as oil reservoirs to aid in heat transfer between engine block and tension roller housing and activate bimetallic diaphragm springs.
- When installing tensioner, ensure sealing surface on block is in good condition. Apply Locktite (No. 574) to sealing surface before installation. When filling tensioner, damping chamber may be bled by pumping tension roller carrier. Ensure belt is loose and oil filler bolt and bleeder are open.
- To fill, remove the larger oil filler and open Allen head bleeder screws on tensioner housing. Using an oil can, slowly pour oil into filler hole until air-free oil flows from bleeder hole.
- Install and tighten filler and bleeder screws. Check fluid level after 1000 miles and at 15,000 mile intervals thereafter. To check, remove filler bolt. If oil can be seen, level is okay. If not, add oil as necessary.