Timing Chain Tensioner: Service and Repair

Timing Chain Tensioner.
A new cam chain tensioner has been introduced as a service measure against noise complaints. Use the alternative design when replacement of the standard tensioner does not cure rattles from the camshaft drive mechanism (most noticeable at idle). Cam Chain Tensioner P/N 75-85-086.

*** FOR ADDITIONAL INFORMATION NOT INCLUDED HERE, REFER TO TSB # 1186911, DATED NOVEMBER, 1986 ***

Fig. 1 Timing Chain Tensioner, Late Type.:

NOTE: Do not remove the safety pin (see arrow) before the tensioner has been fitted into the engine.

Installing A New Tensioner:
1. Remove old tensioner from the engine.
2. Thread in the new design tensioner and tighten to 63 Nm (47 ft lb).





3. Remove the safety pin as shown. The tensioning arm is now released.
4. Tighten the small plug nut to 22 Nm (16 ft lb).

NOTE: If a new design tensioner has been removed for any reason a slightly different installation procedure is required.





Servicing In-Use Tensioner.
1. Start by pushing the ratchet down and retracting the tensioner mechanism.
2. Thread in the tensioner and tighten to 63 Nm (47 ft lb).
3. Insert the spring and plastic guide pin into the hole in the top of the tensioner assembly.

Fitting Center Bolt And Spring, Late Type.:

4. Fit the plug into the top of the tensioner and tighten to 22 Nm (16 ft lb). Be sure that the O-ring is seated properly.