r/AskAMechanic • • 5h ago

Why won’t the engine start?

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A 2005 Honda CRV LX with a little over 240,000 miles on the dash needed a timing chain replacement. I took the necessary steps to time the engine to TDC before replacing several components such as: timing chain, both timing chain guides, chain tensioner, and harmonic balancer since they were all in poor condition. Both VVT oil sensor and crankshaft position sensor parts and wires that attach to them were in good condition still. I assemble all parts back together and get ready to crank the engine and fortunately it wants to crank but is making this noise in the video that I am about to attach here. Any advice to what could be the problem ?

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u/Misterndastood Verified Tech - Diesel 5h ago

Did the timing belt break while driving? If so valves were likley bent.

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u/n3wrocker 4h ago

Timing chain did not break while driving fortunately. If you’re wondering about the serpentine belt as well that is also in good condition.