timing adjustment
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From: San Diego...Cleaner Air, Relax Atmosphere
what is a timing adjustment after you do your timing belt replacement?
is it necessary? what will it affect if you don't adjust it.
is it necessary? what will it affect if you don't adjust it.
You use a timing light to check the ignition timing. If the timing was correct before the belt replacement and you replaced the belt correctly, there shouldn't be a need to adjust it.
You have 2 types of timing. Ignition, and Cam timing.
Ignition timing is set by rotating the distributor. This will advance or retard the firing of the spark plugs.
Cam timing will adjust when your intake and exhaust valves open and close, depending on if you have a DOHC or SOHC engine. The motor needs to be set at TDC (top dead center) when this is done. There are marks on the Crank pulley and cam gears to indicate when it is at TDC.
If you replaced your timing belt and did not set the engine to TDC your timing will be off. Also if the motor was at TDC and the cams somehow were not aligned properly you timing will be off.
Ignition timing is set by rotating the distributor. This will advance or retard the firing of the spark plugs.
Cam timing will adjust when your intake and exhaust valves open and close, depending on if you have a DOHC or SOHC engine. The motor needs to be set at TDC (top dead center) when this is done. There are marks on the Crank pulley and cam gears to indicate when it is at TDC.
If you replaced your timing belt and did not set the engine to TDC your timing will be off. Also if the motor was at TDC and the cams somehow were not aligned properly you timing will be off.
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From: San Diego...Cleaner Air, Relax Atmosphere
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM_teh_WIN!! »</TD></TR><TR><TD CLASS="quote">You have 2 types of timing. Ignition, and Cam timing.
Ignition timing is set by rotating the distributor. This will advance or retard the firing of the spark plugs.
Cam timing will adjust when your intake and exhaust valves open and close, depending on if you have a DOHC or SOHC engine. The motor needs to be set at TDC (top dead center) when this is done. There are marks on the Crank pulley and cam gears to indicate when it is at TDC.
If you replaced your timing belt and did not set the engine to TDC your timing will be off. Also if the motor was at TDC and the cams somehow were not aligned properly you timing will be off.</TD></TR></TABLE>i'll definately ask him about the cam timing. thanks for pointing that out. what if its a sohc engine? i didn't know that replacing t-belt was that complicated. my mec was gonna charge me 100 for labor luckily this is a good friend he didn't charge me but i spend 35 bucks on a bag of oyster and bbq in his back yard with some heineken. i didn't give him money that night but i'll give him 30-40 bucks this weekend.
thanks for the response guys.
Ignition timing is set by rotating the distributor. This will advance or retard the firing of the spark plugs.
Cam timing will adjust when your intake and exhaust valves open and close, depending on if you have a DOHC or SOHC engine. The motor needs to be set at TDC (top dead center) when this is done. There are marks on the Crank pulley and cam gears to indicate when it is at TDC.
If you replaced your timing belt and did not set the engine to TDC your timing will be off. Also if the motor was at TDC and the cams somehow were not aligned properly you timing will be off.</TD></TR></TABLE>i'll definately ask him about the cam timing. thanks for pointing that out. what if its a sohc engine? i didn't know that replacing t-belt was that complicated. my mec was gonna charge me 100 for labor luckily this is a good friend he didn't charge me but i spend 35 bucks on a bag of oyster and bbq in his back yard with some heineken. i didn't give him money that night but i'll give him 30-40 bucks this weekend.
thanks for the response guys.
It's not that difficult. You're making it to be more than it is.
#1. When you started the job, the t-belt was on correctly and your timing was set correctly.
#2. When you took the belt off and then put a new one on - nothing should have changed. IF anything, putting a fresh 'unstreched' belt would put the timing back to where it really should have been when it was new...and we're talking all of a 1* here...maybe. Stock spec is x* +/- 2*, so even as the belt streched, you'd still be in the stock range if it was set dead in the middle to begin with.
#3. IF you put the belt on wrong, as in a tooth advanced/retarded, you may or may not get a code but you can def see the error with a timing light. This has now changed your cam timing which then changed your ignition timing (because the cam drives the distributor), so to fix it you need to re-install the belt correctly which then fixes your ignition timing too.
#4. You are NOT trying to adjust the ignition timing to account for the belt being a tooth off - if it was. You should have known what the timing was before you ever disassembled it.
#5. Since there is a range of +/- 2*, you can adjust it to the high side of the spec, if you wished. But that's it - that's the only adjustment there is to be made here. I'm assuming a stock SOHC setup here, BTW.
#1. When you started the job, the t-belt was on correctly and your timing was set correctly.
#2. When you took the belt off and then put a new one on - nothing should have changed. IF anything, putting a fresh 'unstreched' belt would put the timing back to where it really should have been when it was new...and we're talking all of a 1* here...maybe. Stock spec is x* +/- 2*, so even as the belt streched, you'd still be in the stock range if it was set dead in the middle to begin with.
#3. IF you put the belt on wrong, as in a tooth advanced/retarded, you may or may not get a code but you can def see the error with a timing light. This has now changed your cam timing which then changed your ignition timing (because the cam drives the distributor), so to fix it you need to re-install the belt correctly which then fixes your ignition timing too.
#4. You are NOT trying to adjust the ignition timing to account for the belt being a tooth off - if it was. You should have known what the timing was before you ever disassembled it.
#5. Since there is a range of +/- 2*, you can adjust it to the high side of the spec, if you wished. But that's it - that's the only adjustment there is to be made here. I'm assuming a stock SOHC setup here, BTW.
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From: San Diego...Cleaner Air, Relax Atmosphere
ee_chris,
i kind of get what you're saying now at least you feed a lil bit of knowledge to my head over the internet. remember, before i did the helping hand i have no clue as to what i was getting into.
thanks a lot!
i kind of get what you're saying now at least you feed a lil bit of knowledge to my head over the internet. remember, before i did the helping hand i have no clue as to what i was getting into.
thanks a lot!
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