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can timing belt one tooth advanced cause damage?
Topic Started: Mar 4 2013, 11:27 PM (1,297 Views)
enoc22
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Hi all,
I've been trying to figure out a low MPG issue in my '95 3 cyl. metro.(read more Here)
I've tried a few different things but had a lingering suspicion that it might be off on the timing belt by a tooth.
I moved the cam forward 1 tooth and the car seems to run smooth still.
If i'm actually a tooth advanced could it harm my engine?

Let me know
Thanks
Oliver
Edited by enoc22, Mar 4 2013, 11:28 PM.
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idmetro
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It won't hurt it from an interference standpoint as the G10 is a non-interference engine (yes, we know some references say otherwise - they are wrong...) Make sure you aren't pinging so you don't cause internal damage.

Does the timing check out with a timing light when you jumper the diagnostic connector? Do your timing marks all line up, crank pulley in position, woodruff key and keyway undamaged, crank bolt properly torqued?
Edited by idmetro, Mar 5 2013, 06:09 AM.
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enoc22
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I just tuned it by ear, I'll be timing with a light tonight. On my drive to work this morning i couldn't hear any pinging(is pinging pretty easy to distinguish?). I did notice MPG is at up to around 40 now. Also power has improved.
Timing marks on the camshaft are off by a tooth(on purpose), crankshaft timing marks are lined up. Have never removed or messed with the crankshaft sprocket at all, so i'm not sure on the condition of the woodruff key and keyway and the torque of the bolt. Is it easy to remove the crankshaft sprocket without lifting the engine?

Thanks
Oliver
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enoc22
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So I checked the timing with a timing light, with the dristributor rotated as low as it can go and it shows just about 20' advance. The thing that has me puzzles me is that i averaged 64 MPG(90% highway) on my 80 mile drive. My car car has more power and zip than i can ever remember.
I also re-gapped my spark plugs to a little smaller gap.
Could this be an indication of a sheared woodruff key? no pinging and if anyhting it's running smoother and quieter than it did before.

Any thoughts?
Oliver
Edited by enoc22, Mar 6 2013, 06:59 PM.
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