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Hyundai

Hyundai Timing Belt Replacement

edited from an article by Bob Dowie, ImportCar Magazine, July 2005

The one service job that will require some Hyundai-specific knowledge is timing belt replacement. For the most part, the job is straightforward, but there are a couple of pitfalls. One of the most common problems is confusion on setting timing belt tension. Techs seem to be having the most problems with engines that use the manual/hydraulic tensioner system. This system requires that the tech manually set the base tension to spec, while the hydraulic tensioner maintains the spec through the life of the belt. Your service information will walk you through the procedure. It's not difficult when using the recommended two-pin tensioner tool (rather than using snap-ring pliers as some tech do). The tool is inexpensive and ensures the proper tension when used with an inch-pound torque wrench.If you use an alternate method for the initial setting, you will need to confirm it was correct when checking the movement of the auto tensioner pushrod after the locking pin has been removed and the crankshaft has been rotated twice by hand. At the same time, you'll need to check that the timing marks are where they should be.

Hyundai also uses balance and oil pump shafts driven by the timing belt. In the early 1990s, balance shafts were used on the small displacement 1.6L and 1.8L DOHC engines found in the popular Elantra and the sporty Tiburon, as well as the larger displacement 2.0L and 2.4L engines used in the Sonata. The addition of the balance belt won't cause any problems as long it's timed correctly and the counterweights are in the proper position when the belts are installed. There are access holes in the block that allow you to insert a punch or screwdriver to ensure the weights are at the bottom of the shaft, but they are not always necessary. It isn't difficult to "feel" that the weights are at the bottom of the shaft. Later 1.8L and 2.0L engines went with a timing chain tying the cams together, while a belt was used on the opposite end of the exhaust cam to drive both. No balance shafts are used on these engines but remain necessary on the larger displacement four-cylinder engines.

When replacing a timing belt on a Sonata, be aware that some early models were equipped with bad tensioner assemblies that resulted in the belt contacting the cover. A TSB was issued, calling for a revised tensioner and cover replacement. I would think most of the affected cars have been taken care of, but it's always a good idea to inspect the parts as they're removed, looking for problems that are the result of worn parts.

Pay particular attention to the tensioner and idler pulleys as well as the tensioner itself. Be careful when compressing hydraulic units. Go slowly and note that any signs of leakage, rust or damage should lead to replacement. When removing the belt cover, make note of the length of the bolts and their locations to avoid confusion on reassembly. Diagrams are included in the service info, but it can save some time keeping the bolts in order as they are removed.

There shouldn't be any problem installing the additional parts normally associated with a timing belt replacement. Cam, crank and balance shaft seal replacement shouldn't be a problem. Be careful not to let a leaking valve cover trick you into thinking the seals are leaking. If you're confronted with a car that seems to be leaking excessively, be sure to check the crankcase breather system for blockages. Replacing the water pump, thermostat and coolant makes sense and saves the customer money in the long run, as well as assures good dependable service from the vehicle.

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