timing chain - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rjs53 · 03-09-2019, 11:48 AM

Hey guys, the motor in my 69 c10 which I don't think is original but still a 350 has a hard time with timing. If I advance or retard it still doesn't run worth a crap. I have 3 carburetors I've tried to make sure it ain't that, so I pulled the plugs and turned the crank back and forth. If I start at 6degrees btdc it turns to 4degrees atdc. Seems like a lot of slack to me, what do you think, new timing chain or is this good

**WorkinLonghorn** · 03-09-2019, 11:54 AM

WAY too much.

**jocko** · 03-09-2019, 12:18 PM

Quote:

Originally Posted by rjs53

turned the crank back and forth. If I start at 6degrees btdc it turns to 4degrees atdc.

Are you saying you rotated the crank that much without ANY observed valvetrain movement? Since you're looking at the timing mark, will assume you still have the timing cover installed and are referencing rocker arm/pushrod movement with the valve covers off or something like that? Or perhaps just the distributor cap off and referencing the rotor tip? Just curious. If that is the case, then yes, time for a new timing chain. Recommend a Cloyes true roller. Not expensive, good quality.

rjs53 · 03-09-2019, 01:38 PM

Yes just turned the crank with the dist. cap off and watching rotor. I’m going to check the distributor gear also, but can’t imagine it being that worn out. Thanks for the help

hjewell2 · 03-09-2019, 02:22 PM

I see this in your near future
Part Number: CLO-C-3023X More Detail...

**Sheepdip** · 03-10-2019, 10:15 AM

Fix it sooner than later….some real serious damage can be done.

rjs53 · 03-10-2019, 10:46 AM

Definitely going to fix it before I drive, just thinking I might change the cam at the same time.

**truckster** · 03-10-2019, 12:59 PM

I second the Cloyes double roller kit. In my opinion it's the best one available.

rjs53 · 03-15-2019, 07:05 PM

Got it taken apart and dang if it doesn't have a double roller timing chain. And its tight. It needed a new crank seal so did that. So either my distributor is trashed which I didn't think was that bad or the cams going flat. It was to dark to see, so I'm going to check to make sure the cam hasn't been installed incorrectly.

**AussieinNC** · 03-15-2019, 08:09 PM

Drop a new HEI unit into it ....the old dissy is most likely really worn internally...replace the resistor wire in the loom to get 12v at HEI coil...

BTW...flat cam lobe would not give you sloppy timing variances...

what oil are you running in this engine...? Does it have a zinc component in it?

rjs53 · 03-15-2019, 10:31 PM

It’s the backfireing that had me for a while then I checked the timing and saw it was in and out. Just getting the truck going after replacing rusted body parts, this will be my first oil change. Don’t have anything fancy so I think I’ll put rotella in it

03-09-2019, 11:48 AM	#1
rjs53 Registered User Join Date: Jan 2010 Location: nevada Posts: 649	timing chain Hey guys, the motor in my 69 c10 which I don't think is original but still a 350 has a hard time with timing. If I advance or retard it still doesn't run worth a crap. I have 3 carburetors I've tried to make sure it ain't that, so I pulled the plugs and turned the crank back and forth. If I start at 6degrees btdc it turns to 4degrees atdc. Seems like a lot of slack to me, what do you think, new timing chain or is this good __________________ 2003 Dodge 2500 1969 C10 2014 Camaro SS/RS/1LE

03-09-2019, 11:54 AM	#2
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,858	Re: timing chain WAY too much. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

03-09-2019, 01:38 PM	#4
rjs53 Registered User Join Date: Jan 2010 Location: nevada Posts: 649	Re: timing chain Yes just turned the crank with the dist. cap off and watching rotor. I’m going to check the distributor gear also, but can’t imagine it being that worn out. Thanks for the help __________________ 2003 Dodge 2500 1969 C10 2014 Camaro SS/RS/1LE

03-09-2019, 02:22 PM	#5
hjewell2 Registered User Join Date: May 2011 Location: mich Posts: 654	Re: timing chain I see this in your near future Part Number: CLO-C-3023X More Detail...

03-10-2019, 10:15 AM	#6
Sheepdip Senior Member Join Date: Nov 2018 Location: Waterford California Posts: 2,380	Re: timing chain Fix it sooner than later….some real serious damage can be done.

03-10-2019, 10:46 AM	#7
rjs53 Registered User Join Date: Jan 2010 Location: nevada Posts: 649	Re: timing chain Definitely going to fix it before I drive, just thinking I might change the cam at the same time. __________________ 2003 Dodge 2500 1969 C10 2014 Camaro SS/RS/1LE

03-10-2019, 12:59 PM	#8
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,803	Re: timing chain I second the Cloyes double roller kit. In my opinion it's the best one available. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

03-15-2019, 07:05 PM	#9
rjs53 Registered User Join Date: Jan 2010 Location: nevada Posts: 649	Re: timing chain Got it taken apart and dang if it doesn't have a double roller timing chain. And its tight. It needed a new crank seal so did that. So either my distributor is trashed which I didn't think was that bad or the cams going flat. It was to dark to see, so I'm going to check to make sure the cam hasn't been installed incorrectly. __________________ 2003 Dodge 2500 1969 C10 2014 Camaro SS/RS/1LE

03-15-2019, 08:09 PM	#10
AussieinNC Moderator Join Date: Jun 2017 Location: Cherryville, NC Posts: 2,157	Re: timing chain Drop a new HEI unit into it ....the old dissy is most likely really worn internally...replace the resistor wire in the loom to get 12v at HEI coil... BTW...flat cam lobe would not give you sloppy timing variances... what oil are you running in this engine...? Does it have a zinc component in it? __________________ Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox

03-15-2019, 10:31 PM	#11
rjs53 Registered User Join Date: Jan 2010 Location: nevada Posts: 649	Re: timing chain It’s the backfireing that had me for a while then I checked the timing and saw it was in and out. Just getting the truck going after replacing rusted body parts, this will be my first oil change. Don’t have anything fancy so I think I’ll put rotella in it __________________ 2003 Dodge 2500 1969 C10 2014 Camaro SS/RS/1LE



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