Remove cooling fan, all belts, radiator shroud, pulleys, water pump and harmonic balancer. Probably will need to remove the alternator and power steering pump also. Drain the coolant. loosen the oil pan removing the front 2 bolts on both sides. Take all bolts from the timing chain cover. Carefully remove it from the engine. You should be looking at the old timing chain. Rotate the crank until the two dots, one on the cam gear and the other on the crank gear, are positioned together. Cam gear dot on the bottom, crank gear dot on the top. Take out the 3 cam gear bolts. Slide both gears towards the radiator keeping them lined up. Install in reverse order.
SOURCE: timing chain cover cracked
A cracked cover will not cause a leak. Overtightening the cover will cause a problem or perhaps they mishandled it and broke it and tried to put it back on. The seals around the camshafts may be at fault. When they replaced the fuel pump they should not have messed with this so I would have them explain what they did.
SOURCE: how to replace a timing chain 2000 chevy cavalier
I am familiar with that vehicle but generally with timing chain replacement, the engine needs full access for pulley and cover removal and in some cases the cylinder head requires removal.
Generally timing chains last so that they only need replacement at engine overhaul and it is not an economic proposition to have to replace a chain unless some relative degree of engine work is also required at that time.
Engine timing chains generally have a tensioner on them which maintains tension, but some chains can wear significantly and cause timing cover to be "ground away" because of "slop".
If the engine is making the noisy rattle of the timing chain against the cover etc, I would schedule a top overhaul (head, machine, test and valve grind) with the chain replacement dependent on mileage with the degree of action.
Some simple simplex timing chains (type of chain similar to motor bike chain) may be replaced without dismantling the engines but I would expect your chain would be a "duplex" dual sprocket type, these are most common.
These chains are not generally expensive but replacing them can involve a fair amount of work.
Good Luck and hope this helps, Others will have different ideas.
SOURCE: timing chain replacement
Go to your local Library and you can probably get great help there if your gonna do this ur self and if u don't want to spend money on a manual for ur car and even that might not have what u need.
SOURCE: How do I replace water pump and timing chain on
If You Only need to replace water pump, you need a special tool to hold water pump sprocket in place while changing the pump, Just look up GM 2.2 Water pump tool on e-bay, or ask a local auto parts store if they rent one out. Garages make out like a bandit to replace these water pumps, because you need this special tool to do the job, and ti is impossible to do it without . Good Luck
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