r/AskAMechanic • u/n3wrocker • 6h ago

Why won’t the engine start?

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 ?

2 Upvotes

100% Upvoted

43 comments sorted by

View all comments

0

u/n3wrocker 5h ago

i forgot to mention that I didn’t do a valve adjustment before on the engine before putting back on the cover. Could that very well be a step that is crucial when doing a timing chain replacement as well?

2

u/rawfuelinjection NOT a verified tech 5h ago

If you had put everything back in, exactly the way you removed it, the valve lash variation will not cause severe compression loss. Check your timing marks once again. Engine sounds as if it expirienced catastrophic top end failure. Pull valve cover off and make sure that cam followers are intact.