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it is good mechanical practice to replace all bolts that are operating under tension. That includes con rod bolts , big end bolts fly wheel bolts , head studs and crank shaft bolt. Some manuals recommend the replacement of cam shaft sprocket bolts as well. This practice is recommended where the engine is driven at high rpms. It is recommended practice because the tension effect actually twists the bolt and this combined with the tensional stress makes the bolts prone to failure. As it adds considerably to the cost many mechanics do not follow the practice but will charge for the new bolts as well.
The 6 cyl engine uses an adjustable pulley to keep the belt tight. The 8 cyl engine uses a tensioner that is spring loaded. You have to loosen the mounting bolts and turn the adjusting bolt to move it on the 6 cyl. You use a bar or wrench to move the tensioner.
to replace belt use a 15mm wrench on the bolt that holds tensioner pulley .to relieve belt tension ,rotate the tensioner clockwise on a ohv engines or counter clockwise on ohc engines. should have a sticker under hood to how belt is routed.
Timing Chain and Gears REMOVAL & INSTALLATION 2.2L Engine
Fig. 1: The timing marks on the sprockets should be in alignment. If not, turn the crankshaft until the marks are aligned
Fig. 2: The timing chain tensioner is retained by a Torx head bolt (1) and a regular hex head bolt (2)
Fig. 3: Unfasten the camshaft sprocket bolt
Fig. 4: Remove the camshaft sprocket and the timing chain at the same time . . .
Fig. 5: . . . then remove the tensioner assembly
Fig. 6: Compress the tensioner spring and insert a cotter pin or nail in the hole provided to hold the tensioner in position
Fig. 7: Exploded view of the timing chain and sprockets - 2.2L OHV engine
That depends on which engine you have. On v8 engines you need to put a wrench on the tensioner pulley and pull it over. On six cyl and four cyl engines there is an adjustment bolt on the power steering pump. Loosen the pump slide bolts and turn the adjustment bolt that moves the pump in and out of adjustment. (bolt runs under the pump...long threaded rod with a bolt head)
hi from uk the cambelt timing marks for accent 1.3/1.5 petrol are as follows= the cam cog has a hole drilling between the outer toothed and the central securing bolt this hole at TDC number 1 cyl is at top central and lines up with a V cut in the cyl head at rear of cog ? the crank cog at TDC number 1 cyl is a pop mark on both the cog and on thefront face of engine quite noticable ! these line up and are at approx 12 -30 pm when viewed fit new belt from crankcog in anticlockwise ie crank then cam then tensioner HOWEVER! if you are considering just replacing belt and tensioner ? be warned this engine is an interferance engine that is to say if belt fails whilst driving there may/will most probably be damage to the valves (bent) due to contact with pistons so would advise caution and suggest compression test all cyls after fitting new belt and tensioner and before rebuild completely once valves have bent they will not contact pistons again but you will have serious missfire/s and probably back fire up inlet manifold coupled with failing to start if engine is high milage ? consider removal of cyl head and check? de coke and replace damaged or best all valves then engine will have improved performance and more milesin future hope this helps