I own a 2004 dodge intrepid and it has about 180,000 miles on it. i recently replaced the water pump, oil pump and the timing chain. now when i got the timing chain fixed some how it was not put on correctly so the valves bent. the mechanic fixed the valves but now it sounds like a ticking sound when running. i heard it might be the lifters but dont know for sure. also the mechanic told me to use 15w40 oil to stop this noise. dont know what to do.

SOURCE: OVERHEATING DODGE RAM 1500

Which engine?
Are you looking for a leak or does the engine just get hot?
It's been my experience that unless you have the timing too advanced (not probable on computerized engines), or there is a spun bearing (which would make noise), then an overheating problem is most likely (after the thermostat) the radiator being plugged up. It could have been partially defective to start with (no, 'flushing' doesn't usually help).
Bars leak will only make the problem worse.

SOURCE: 2005 Durango 3.7L Ticking Noise

See if the cam or rocker arms are worn. New lifters and other worn parts won't work. Also make sure you have good oil pressure and the oil is getting to the top of the engine.

SOURCE: ticking or clicking noise in the engine while at idle speed

The "lifters" are valve lifter, not oil lifters. They are best described as hydraulic cushions. They use the engine oil pressure to expand and take up the slack between components. As the engine wears, clearances increase and the oil pressure decreases at idle. The ticking goes away with an increase RPM because the oil pressure increases. Using an additive like STP to thicken the oil some might stop it. It isn't uncommon or serious. I had a car once that had lifter noise unless I used Rislone detergent additive to keep varnish from building up around the lifter making it stick. The symtom of coolant in the oil is milkey foam. Some synthetic oils go in clear then turn red or purple. Relax and enjoy the next 100,000 miles. Keep the oil and air filter changed and watch for a leaking water pump. Overheating because the water pump seal or thermostat failed is the death of an older engine. If you want to be proactive, have these and the radiator hoses changed. Avoid a made in China water pump if possible.

SOURCE: 2001 Dodge Intrepid overheating - blown engine?

The timing belt drives the water pump so it would be advisable to replace the timing belt if you replace the pump and visa versa. The timing belt should have been replaced at 105,000 miles and if you did replace it at that time, then I would not replace it again unless it is soaked in leaking coolant. If not, then for sure replace it. Replace the tensioner if it is defective. You need to find a good mechanic that is not just guessing as to what is wrong. If you have no apparent external leak and you are seeing a milky substance on the underside of the oil cap, you may have a blown head gasket. Do you see white smoke coming from the exhaust? Do you see air bubbles escaping from the radiator with the cap off and the engine running? If so you have a blown head gasket or cracked head. A compression test will help determine this one way or the other. A dye test on the cooling system will also help tell you where the coolant is leaking. If the water pump is bad it should be leaking. 130,000 miles is not that much on a modern engine. This engine will easily last 200,000 miles if maintained properly. So it is worth repairing, but that is your decision. You just need to find a good mechanic that actually knows what they are doing.