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The production third generation Quest was unveiled for the 2004 model year at the 2003 North American International Auto Show.

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Slipped timing chain on a 3.5l engine

I have an 06 Quest when i last drove it, I was going up a slight incline at 60 mph. I heard a small metallic sound and the Quest lost. Power and died. It would crank but not start. My mechanic said I threw a timing chain. His repair quote was about $3600. My question is, if the plastic clip holding the tensioner broke. Would the repair be as costly. I was told I would need a water pump, oil pump, new timing chain and gaskets . does this sound right and is it worth it. I only paid $2500 or it with 120000 miles on it.

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Yes it would be very expensive. In most newer cars “2000 and up" the motor is so tightly packed into the body of the car you would need to pull the entire motor out inordor to chance something like the timing chain. Also I believe the motor you have is what is called an interference motor. This means if it jumps / throws a timing chain they head of the piston will make contact with the cylinder head and valves. Now with a car as common as yours the parts aren't the big issue but I bet the book time is very high as I said earlier with pulling the motor out.

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first thing before you spend any money on the job, if the timing has gone it is possible the valves could of hit the pistons so I would get someone to check that before you throw any money at it (it is possible they will be okay) and yes its best practice to replace the water pump when doing a timing chain job as the new chain will outlast the water pump probably and you will be paying the same labour cost in a years time or so. Oil pump not so sure it will need changing unless its damaged it should be fine as it is. Gaskets and timing chain kit is a given obviously, if its a V6 or an engine with the chain at the rear it will involve removing the engine which is more time and expense, some cars can be done with the engine in if its a single chain at the front by removing the front end of the car, either way a basic car with one chain at the front with no engine removal will set you back around £700 whatever that converts into $, we do a lot of the over here and normally looking over £1,000 for a job with engine removal. all depends on price for parts too, any gaskets or parts that are dealer only and how much you water pump will cost. on the upside if the car is serviced often and looked after a new chain should last easily 100,000 miles, its usually the tensioners that fail and cause the chain to become loose and skip or break, you can usually hear them starting to fail and can replace them for a fraction of the cost. If the engine is okay and in working order to go ahead with the repair then it will come down to do you see yourself driving the car long term, if so the repair is worth it, if not don’t waste money on the repair.

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Mark Denton sarà eternamente grato.
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