Chapter 1 Routine maintenance and servicing

Zetec engine in-car repair procedures 2C•78.20 Slacken tensioner bolt to give initialbelt tension8.23 Using forked holding tool whilecamshaft toothed pulley bolt is tightened8.24 When setting is correct, tightentensioner bolt to specified torque wrenchsetting19 Fit the timing belt; if the original is beingrefitted, ensure that the marks and notesmade on removal are followed, so that the beltis refitted the same way round, and to run inthe same direction. Starting at the crankshaftsprocket, work anti-clockwise around thecamshaft sprockets and tensioner, finishingoff at the rear guide pulley. The front run,between the crankshaft and the exhaustcamshaft sprockets, must be kept taut,without altering the position either of thecrankshaft or of the camshaft(s) - if necessary,the position of the camshaft sprockets can bealtered by rotating each on its camshaft(which remains fixed by the aligning tool).Where the sprocket is still fastened, use theholding tool described above to prevent thesprocket from rotating while its retaining boltis slackened - the sprocket can then berotated on the camshaft until the belt will slipinto place; retighten the sprocket bolt.20 When the belt is in place, slacken thetensioner bolt gently until the spring pulls thetensioner against the belt; the tensionershould be retained correctly against the timingbelt inner shield and cylinder head, but mustbe just free to respond to changes in belttension (see illustration).21 Tighten both camshaft sprocket bolts (orcheck that they are tight, as applicable) andremove the camshaft-aligning tool.Temporarily refit the crankshaft pulley, androtate the crankshaft through two full turnsclockwise to settle and tension the timing belt,returning the crankshaft to the TDC positiondescribed previously. Refit the camshaftaligningtool; it should slip into place asdescribed in paragraph 8. If all is well,proceed to paragraph 24 below.22 If one camshaft is only just out of line, fitthe forked holding tool to its sprocket, adjustits position as required, and check that anyslack created has been taken up by thetensioner; rotate the crankshaft through twofurther turns clockwise, and refit thecamshaft-aligning tool to check that it now fitsas it should. If all is well, proceed toparagraph 24 below.23 If either camshaft is significantly out ofline, use the holding tool to prevent itssprocket from rotating while its retaining boltis slackened - the camshaft can then berotated (gently and carefully, using an openendedspanner) until the camshaft-aligningtool will slip into place; take care not todisturb the relationship of the sprocket to thetiming belt. Without disturbing the sprocket’snew position on the camshaft, tighten thesprocket bolt to its specified torque wrenchsetting (see illustration). Remove thecamshaft-aligning tool, rotate the crankshaftthrough two further turns clockwise, and refitthe tool to check that it now fits as it should.24 When the timing belt has been settled atits correct tension, and the camshaft-aligningtool fits correctly when the crankshaft pulleynotches are exactly aligned, tighten thetensioner bolt to its specified torque wrenchsetting (see illustration). Fitting the forkedholding tool to the spokes of each sprocket inturn, check that the sprocket bolts aretightened to their specified torque wrenchsetting. Remove the camshaft-aligning tool,rotate the crankshaft through two further turnsclockwise, and refit the tool to make a finalcheck that it fits as it should.25 The remainder of the reassemblyprocedure is the reverse of removal, ensuringthat all fasteners are tightened to the specifiedtorque.9 Timing belt tensioner andsprockets - removal,4inspection and refittingTensionerNote: If the tensioner is being removed for thefirst time since the vehicle left the factory, atensioner spring and retaining pin must beobtained for fitting on reassembly.1 While it is possible to reach the tensioneronce the timing belt upper and middle coversonly have been removed, the wholeprocedure outlined below must be followed,to ensure that the valve timing is correctlyreset once the belt’s tension has beendisturbed.2 Release the tension from the timing belt asdescribed in Section 8, paragraphs 1 to 12.3 Unscrew the tensioner bolt and withdrawthe tensioner, unhooking the spring, if fitted(see illustration). Check the tensioner spring,and renew it if there is any doubt about itscondition.4 On reassembly, if it is being fitted for thefirst time, screw the timing belt tensionerspring retaining pin into the cylinder head,tightening it to the specified torque wrenchsetting. Hook the spring onto the pin and thetensioner backplate, then refit the tensioner,engaging its backplate on the locating peg.5 Use an Allen key inserted into its centre torotate the tensioner as far as possible againstspring tension, then tighten the bolt to securethe tensioner.6 Reassemble, checking the camshaftalignment (valve timing) and setting the timingbelt tension, as described in paragraphs 20to 25 of Section 8.Camshaft and crankshaftsprockets7 While it may be possible to remove any ofthese sprockets once the relevant belt covershave been removed, the complete timing beltremoval/refitting procedure (see Section 8)must be followed, to ensure that the valvetiming is correctly reset once the belt’stension has been disturbed.8 With the timing belt removed, the camshaftsprockets can be detached once theirretaining bolts have been unscrewed asdescribed in paragraph 16 of Section 8. Thecrankshaft sprocket can be pulled off the endof the crankshaft, once the crankshaft pulley9.3 Removing timing belt tensioner2C1595Ford Fiesta Remake