I was driving, suv just lost power. Thought it was battery, but thats not it, it makes a funny noise when cranking it, it trys to start, but it won't. Was told its timing chain, but I'm not convinced

Asked by Mar 07, 2014 at 01:09 AM about the 2000 Mercury Mountaineer 4 Dr STD 4WD SUV

Question type: Maintenance & Repair

Its a v6, I was also told u could see that the
chain in front looks worn, but what I have
googled it doesn't sound like the timing
chain. If anyone could help out it would be
greatly appreciated

1 Answer

88,785

If a timing chain is worn out and jumps time the compression is greatly reduced due to the valves not in time with the crankshaft, one quick to tell how much slack is in the chain is to make a mark on the lower pulley and then slowly turn the that pulley counterclockwise until you feel some resistance, it should only turn about a 1/4 inch, if it goes any farther then the chain is worn past specs, or you could run a compression test on the engine, in most cases the compression should not go lower than 150 unless you have a high mileage engine then the compression should not vary more than 25% from high cylinder to low cylinder. HTH

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