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machinist
Anonymous Poster
Mar 2, 2009, 9:39 AM
Post #1 of 6
(1926 views)
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I have a question- How would you be able to tell if you are off a tooth or more on your valve timing (lets say someone just changed there timing belt), without having a scope and a pressure transducer and without having to take off the timing cover. There is nothing wrong with my car I was just curious if anybody knew a way to do this without a lot of expensive equiptment.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 2, 2009, 10:55 AM
Post #2 of 6
(1923 views)
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! If there's "nothing wrong" why do you question it? Just curious on that?
Hmmm - if a belt or chain was off just one tooth most would run and perhaps run ok. There could be a uniform, smooth general loss of power and in most newer anythings would probably show more emissions than normal.
A quick simple test would be to test intake manifold vacuum at a normal idle. 18Hg should show or close to that - at sea level! It would show lower than normal with even one tooth, two would be excessive and by 3 teeth or more the engine might not run at all.
Other ideas guys?
T
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machinist
Anonymous Poster
Mar 2, 2009, 1:30 PM
Post #3 of 6
(1918 views)
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I was looking at a sight about automobile scopes and pressure transducers, and I figured valve timing being off could be a common problem (timing belts and water pumps that run off of timing chains). So I guess there is no accurate way to know if the timing is correct except to use a scope and transducer or take the timing cover off. Thank you, for your responce Tom.
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Loren Champlain Sr
Veteran
/ Moderator
Mar 2, 2009, 4:34 PM
Post #4 of 6
(1910 views)
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machinist; You can tell by bringing #1 up on the compression stroke, line up the timing mark at TDC and then check to see if the camshaft mark is aligned. If it's a belt driven cam, removing the upper half of the cover shouldn't be too difficult. A 'scope' is not going to give you that kind of information. As Tom suggested, a vacuum reading is a good indicator. A pressure transducer? Never heard of it.
Loren
SW Washington
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machinist
Anonymous Poster
Mar 2, 2009, 5:00 PM
Post #5 of 6
(1909 views)
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You could look-up the site www.automotivetestsolutions.com It tells about all the things you can do with a scope and transducers. Thanks for the responce.
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Loren Champlain Sr
Veteran
/ Moderator
Mar 2, 2009, 5:06 PM
Post #6 of 6
(1907 views)
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machinist; I looked, but not impressed. Sorry.
Loren
SW Washington
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