Trying to get it timed right - question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

don t. - 72gmc · 03-27-2002, 01:20 PM

Borrowed a timing light & dwell/tach gauge. Hooked up timing light, works fine. Found timing mark on crank, highlighted w/chalk. Tried to find the mark but no luck. Tried a white crayon, same thing. Any ideas?
thanks...don t. ....

**COBALT** · 03-27-2002, 01:22 PM

White touch-up paint. The kind that has reflective stuff, or glow-in-the-dark stuff in it.

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!

Alex Hayley · 03-27-2002, 02:32 PM

I think I may have an idea of whatis happening... Take a look for the timing mark that you highlighted outside of the timing area that you are aiming the light at. For example, mine is a ways up under the waterpump. I still am not sure why that is but it runs fine. There was a thread on this problem months ago. There was also a thread on timing by vacumm that may come in handy if my suggestion fits your problem.

boilrman · 03-27-2002, 03:31 PM

If your timing mark is under your water pump, your distributor is out by 1 tooth or so.

I just went thruogh all this with my inline 6. It makes no difference if its there, but a timing light is of no help in this situation.

------------------
1971 Chevy 1/2t, 350 -- SOLD
1998 Yamaha V-Star 650
1970 Chevy 3/4t, I6(freshly rebuilt), 4 speed
Keokuk,IA

http://communities.msn.com/SchweringFamily/shoebox.msnw

MSN Messenger = boilrman
Find a job you love and you'll never have to work a day in your life.

don t. - 72gmc · 03-27-2002, 03:55 PM

Thanks for your tips. Its been a LONG time since i've done this (some memories are starting to come back). I found my pressure gauge and timed it by that. Seems ok at idle but she stumbles on acceleration. Thought it would be better to do by the light. I stopped/started light many times thinking it was a bit off, never saw my mark.

Question....I thought the dist. was either in right or its 180 off. If its off by one tooth, did the timing chain/gears slip/break?

**COBALT** · 03-27-2002, 04:05 PM

Your distributor is probably correct, but your rotor needs to be advanced maybe?!? I think if your distributor was 180 off your engine would run like hell (if at all).

Oh, and earlier I thought you meant your mark wasn't obvious to actually see, that's why I suggested the paint! Sorry. Didn't know what you meant. lol

------------------
'69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed!
'69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast).
Seattle, WA.

*See pics of my trucks and project at www.webshots.com!

don t. - 72gmc · 03-27-2002, 04:49 PM

I found the timing plate behind the water pump. I found the line/mark on the harmonic balancer. The line/mark I highlighted w/chalk and a crayon. I start it up, shoot the light, can't find the line/mark with the timing light. Didn't think about moving the light around to see if its just "way off" or what. Did stop/start light many times cuz I had a flashback to a time when the timing light wouldn't show the mark but if you start/stop it, there it was.
Hey, its quittin time, will check back in when I get home.
Thanks much,....don t. ....

Professor · 03-27-2002, 04:55 PM

This may be an obvious question, but.... Are you sure the timing light is on the #1 plug wire?

REPO1 · 03-27-2002, 05:09 PM

Has the motor ever been replaced, or had an overhaul? Small block chevy engines had 2 different timing marks. One was welded to the timing cover behind the water pump. The other actually bolted behind 2 bolts on the drivers side of the timing chain cover.

There were also 2 different balancers, depends that correspond to the timing marks.

Anyway with it running and you light flashing, have a look more towards the drivers side and see if the mark is there.

------------------
Sylvan Lake, Alberta, Canada

1970 Chevy C20 Custom Camper
#s matching 402BB Turbo 400 trans.
Air conditioning, power steering, manual brakes.
73,600 Original Miles!!

**Bernie** · 03-27-2002, 05:39 PM

Did you disconnect the vacuum advance before using the timing light ?

704x4 · 03-27-2002, 06:10 PM

new69owner
you can put the distributor in with the rotor or the body turned what ever way you please

then you just find tdc of the number one cylinder on the compression stroke(both valves closed). what ever spot the rotor is pointing at is where your number one spark plug wire goes

just my 2c worth

Gordo · 03-27-2002, 06:39 PM

Screw the timing light,,,on a daily basis, advance the distributor a little bit at a time (moving dist counter clockwise) until you experience pinging while driving (spark knock) then back up (clockwise) until it stops pinging. Do this with the vacumn advance plugged in. Where the timing ends up depends on the condition of the engine and the octane of the gas your using. Now you can check the timing (where it's at) with a light and see where it runs best for future reference.

------------------
1971 C10 swb stepside 350/700R4/3.73posi
Killingworth, Connecticut

don t. - 72gmc · 03-27-2002, 07:49 PM

Now I really feel stupid!!! Picture..last night after work..44 yr. old burn-out whos cleaned up his act and wants to play w/toys again. Read the book, it says pick ANY plug wire, hooked up tach, off & running. Same connections for tach run light.I KNOW from way back, its supposed to be #1 plug but all I remembered was ANY wire. Stopped reading post and sure enough im useing #6. Switched plugs, WOO-WHO, theres my mark.
Timed to 8btdc. Idels nice but still stumbles, almost like the advance aint working, but timing light showed its moving. Right now, im not sure what to look at. Ive changed all the basics, this was the last check. I know its close, once it gets going, its strong.
Thanks all. Getting closer...don t. ...

bigjimzlll · 03-27-2002, 08:19 PM

it could be moving just from your mechanical advance...maybe your vacuum advance module is leaking ....that would make a small vacuum leak...try pulling the dist cab..and I know this sounds wierd, but suck in the vacuum line..if the points(module) move than its ok

------------------
67 lwb fleetside...first hotrod in 25 years...283..186 bowl ported heads..270h comp cam 600 1405...stealth intake..HEI..th350 with 2500 rpm stall..4:10 POSI
god I love to go fast

03-27-2002, 01:22 PM	#2
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	White touch-up paint. The kind that has reflective stuff, or glow-in-the-dark stuff in it. ------------------ '69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed! '69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast). Seattle, WA. *See pics of my trucks and project at www.webshots.com! __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

03-27-2002, 03:31 PM	#4
boilrman 70 Chevy 3/4t Join Date: Sep 2000 Location: Kokomo,IN USA Posts: 1,230	If your timing mark is under your water pump, your distributor is out by 1 tooth or so. I just went thruogh all this with my inline 6. It makes no difference if its there, but a timing light is of no help in this situation. ------------------ 1971 Chevy 1/2t, 350 -- SOLD 1998 Yamaha V-Star 650 1970 Chevy 3/4t, I6(freshly rebuilt), 4 speed Keokuk,IA http://communities.msn.com/SchweringFamily/shoebox.msnw MSN Messenger = boilrman Find a job you love and you'll never have to work a day in your life. __________________ Find a job you love and you'll never have to work a day in your life. 1998 Yamaha V-Star 650 1970 Chevy 3/4t, I6 (rebuilt), 4 speed Kokomo,IN

03-27-2002, 05:09 PM	#9
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Has the motor ever been replaced, or had an overhaul? Small block chevy engines had 2 different timing marks. One was welded to the timing cover behind the water pump. The other actually bolted behind 2 bolts on the drivers side of the timing chain cover. There were also 2 different balancers, depends that correspond to the timing marks. Anyway with it running and you light flashing, have a look more towards the drivers side and see if the mark is there. ------------------ Sylvan Lake, Alberta, Canada 1970 Chevy C20 Custom Camper #s matching 402BB Turbo 400 trans. Air conditioning, power steering, manual brakes. 73,600 Original Miles!! __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

03-27-2002, 05:39 PM	#10
Bernie Senior Member Join Date: Jan 2001 Location: Northern Illinois Posts: 516	Did you disconnect the vacuum advance before using the timing light ? __________________ Bernie

03-27-2002, 06:10 PM	#11
704x4 Registered User Join Date: Feb 2002 Location: Greene, Iowa Posts: 150	new69owner you can put the distributor in with the rotor or the body turned what ever way you please then you just find tdc of the number one cylinder on the compression stroke(both valves closed). what ever spot the rotor is pointing at is where your number one spark plug wire goes just my 2c worth __________________ 70 3/4 ton 4x4 FOR SALE Greene, IA

03-27-2002, 01:20 PM	#1
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 389	Trying to get it timed right - question Borrowed a timing light & dwell/tach gauge. Hooked up timing light, works fine. Found timing mark on crank, highlighted w/chalk. Tried to find the mark but no luck. Tried a white crayon, same thing. Any ideas? thanks...don t. ....

03-27-2002, 02:32 PM	#3
Alex Hayley Registered User Join Date: Jul 2000 Location: NC Posts: 987	I think I may have an idea of whatis happening... Take a look for the timing mark that you highlighted outside of the timing area that you are aiming the light at. For example, mine is a ways up under the waterpump. I still am not sure why that is but it runs fine. There was a thread on this problem months ago. There was also a thread on timing by vacumm that may come in handy if my suggestion fits your problem.

03-27-2002, 03:55 PM	#5
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 389	Thanks for your tips. Its been a LONG time since i've done this (some memories are starting to come back). I found my pressure gauge and timed it by that. Seems ok at idle but she stumbles on acceleration. Thought it would be better to do by the light. I stopped/started light many times thinking it was a bit off, never saw my mark. Question....I thought the dist. was either in right or its 180 off. If its off by one tooth, did the timing chain/gears slip/break?

03-27-2002, 04:05 PM	#6
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Your distributor is probably correct, but your rotor needs to be advanced maybe?!? I think if your distributor was 180 off your engine would run like hell (if at all). Oh, and earlier I thought you meant your mark wasn't obvious to actually see, that's why I suggested the paint! Sorry. Didn't know what you meant. lol ------------------ '69 3/4 ton C20 2wd w/ 350ci/400THM and a wood bed! '69 3/4 ton Custom 20 2wd w/ ORIGINAL 350ci/4sp Manual and a wood bed (parts beast). Seattle, WA. *See pics of my trucks and project at www.webshots.com! __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

03-27-2002, 04:49 PM	#7
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 389	I found the timing plate behind the water pump. I found the line/mark on the harmonic balancer. The line/mark I highlighted w/chalk and a crayon. I start it up, shoot the light, can't find the line/mark with the timing light. Didn't think about moving the light around to see if its just "way off" or what. Did stop/start light many times cuz I had a flashback to a time when the timing light wouldn't show the mark but if you start/stop it, there it was. Hey, its quittin time, will check back in when I get home. Thanks much,....don t. ....

03-27-2002, 04:55 PM	#8
Professor Registered User Join Date: Mar 2001 Location: Fayetteville, Arkansas Posts: 160	This may be an obvious question, but.... Are you sure the timing light is on the #1 plug wire?

03-27-2002, 06:39 PM	#12
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Screw the timing light,,,on a daily basis, advance the distributor a little bit at a time (moving dist counter clockwise) until you experience pinging while driving (spark knock) then back up (clockwise) until it stops pinging. Do this with the vacumn advance plugged in. Where the timing ends up depends on the condition of the engine and the octane of the gas your using. Now you can check the timing (where it's at) with a light and see where it runs best for future reference. ------------------ 1971 C10 swb stepside 350/700R4/3.73posi Killingworth, Connecticut __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

03-27-2002, 07:49 PM	#13
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 389	Now I really feel stupid!!! Picture..last night after work..44 yr. old burn-out whos cleaned up his act and wants to play w/toys again. Read the book, it says pick ANY plug wire, hooked up tach, off & running. Same connections for tach run light.I KNOW from way back, its supposed to be #1 plug but all I remembered was ANY wire. Stopped reading post and sure enough im useing #6. Switched plugs, WOO-WHO, theres my mark. Timed to 8btdc. Idels nice but still stumbles, almost like the advance aint working, but timing light showed its moving. Right now, im not sure what to look at. Ive changed all the basics, this was the last check. I know its close, once it gets going, its strong. Thanks all. Getting closer...don t. ...

03-27-2002, 08:19 PM	#14
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	it could be moving just from your mechanical advance...maybe your vacuum advance module is leaking ....that would make a small vacuum leak...try pulling the dist cab..and I know this sounds wierd, but suck in the vacuum line..if the points(module) move than its ok ------------------ 67 lwb fleetside...first hotrod in 25 years...283..186 bowl ported heads..270h comp cam 600 1405...stealth intake..HEI..th350 with 2500 rpm stall..4:10 POSI god I love to go fast __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA



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