Code Blue! She's down! 911! - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**El Jay** · 12-07-2009, 02:48 AM

Quick & Dirty:

Roll the engine until the harmonic balancer/timing mark is at 0 degrees.
Pop the distributor cap.
If the rotor is not pointing at the #1, or #6, terminal then most likely the timing chained has slipped and your cam (& ignition) timing is out the window.

Then you can go from there.

OhOneWS6 · 12-07-2009, 11:18 AM

Ditto what LJ Said. While you have the cap off use a socket to turn the crank clockwise until the rotor moves. Now turn the crank in the opposite direction and note how many degrees you have to turn it before the rotor moves. This will tell you how much the chain has stretched.

Longhorn321 · 12-07-2009, 11:59 AM

Quote:

Originally Posted by El Jay

Quick & Dirty:

Roll the engine until the harmonic balancer/timing mark is at 0 degrees.
Pop the distributor cap.
If the rotor is not pointing at the #1, or #6, terminal then most likely the timing chained has slipped and your cam (& ignition) timing is out the window.

Then you can go from there.

That will prolly depend somewhat on how much the chain has slipped but that is a good idea. I suspect it slipped quite a bit cuz it just quit altogether and in a hurry.

Quote:

Originally Posted by OhOneWS6

Ditto what LJ Said. While you have the cap off use a socket to turn the crank clockwise until the rotor moves. Now turn the crank in the opposite direction and note how many degrees you have to turn it before the rotor moves. This will tell you how much the chain has stretched.

How much would you say is "normal"?

OhOneWS6 · 12-07-2009, 08:48 PM

Quote:

Originally Posted by Longhorn321

That will prolly depend somewhat on how much the chain has slipped but that is a good idea. I suspect it slipped quite a bit cuz it just quit altogether and in a hurry.

How much would you say is "normal"?

Depends on what you have and how you use it. 2* on a 750 HP roller motor is a lot. 2* on a 100K+ mile original small block is probably within tolerance. Seems like mine moved as much as 12* when I replaced the chain and gear. It had a steel upper gear so it never jumped. It ran like crap and the timing floated around so much I couldn't come near timing it with a light.

Use that test as just one part of your troubleshooting. If it only moves a couple of degrees I'd start looking somewhere else for the issue. If it moves several degrees it may be loose enough to jump time.

mikajo39 · 12-07-2009, 09:59 PM

Oh boy, this reminds me how my old engine left this world, went for a quick romp around town, idle back in, engine makes bad noises does the whole coasting thing and she was kaput, sad thing was it wasn't going more than 15 mph! I sheared my entire timing gear, piston kissed valves and the highest compression i could coax out of a cylinder was 80 psi, it was a bad day, but hey it was a great excuse for a new engine

Longhorn321 · 12-08-2009, 09:56 AM

Quote:

Originally Posted by OhOneWS6

Depends on what you have and how you use it. 2* on a 750 HP roller motor is a lot. 2* on a 100K+ mile original small block is probably within tolerance. Seems like mine moved as much as 12* when I replaced the chain and gear. It had a steel upper gear so it never jumped. It ran like crap and the timing floated around so much I couldn't come near timing it with a light.

Use that test as just one part of your troubleshooting. If it only moves a couple of degrees I'd start looking somewhere else for the issue. If it moves several degrees it may be loose enough to jump time.

Thanks, I'll take a look at that.

Longhorn321 · 08-27-2014, 10:30 PM

Soooooo....a mere 4 years and 8+ months later.... It's running again!

Now for some tweakin, adjustin and such. Brakes are down (duh), radiator cap was squiting a lil when I was trying to get it running (weird?), STILL needs more tranny juice (6qts so far), needs exhaust, blah, blah, blah. I'm just happy to report that it actually moved under it's own power (into the garage...still gotta get the timing and mixture set). How's that for the slowest fix for a slipped timing chain ever??

Bobs68gmc · 08-27-2014, 10:34 PM

lmao.
I started reading this and thought...... the date on this...... somebody accidently drug up an old thread....... then .... omg. I understand.

well... glad to see you didnt give up all together!

sboris · 08-27-2014, 10:42 PM

Hey man, its not a race, its a marathon! Right? Youll get it, keep plugging away..

Longhorn321 · 08-28-2014, 08:50 AM

To be fair, I did fix more than the timing chain. Complete re-build and general clean up of the engine bay. I know, I know...that still doesn't normally take almost 5 years. What can I say, I'm slow. Life got in the way. No time, no money, blah, blah, blah....

67ChevyRedneck · 08-28-2014, 09:36 AM

Andy4639 · 08-28-2014, 09:54 AM

Glad you gotter done man! Hope to hear it in person really soon. Ha!!!!

zeldman · 08-28-2014, 06:48 PM

So did you find anything broken in the engine?

1972RedNeck · 08-28-2014, 09:36 PM

I don't believe it.

Congrats on getting it going.

Longhorn321 · 08-29-2014, 08:44 AM

Quote:

Originally Posted by zeldman

So did you find anything broken in the engine?

The timing gears were very worn but really nothing was completely broken.

Longhorn321 · 08-29-2014, 08:45 AM

Quote:

Originally Posted by 1972RedNeck

I don't believe it.

Congrats on getting it going.

I'll get on the pics ASAP.

Longhorn321 · 08-29-2014, 09:43 AM

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Longhorn321 · 08-29-2014, 09:52 AM

And now....
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Bigdav160 · 08-29-2014, 10:02 AM

I'd say the chain slipped. I've only seen one other on a Chevy V8 and it bent the valves. Consider yourself lucky it wasn't worse.

12-07-2009, 02:48 AM	#26
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Code Blue! She's down! 911! Quick & Dirty: Roll the engine until the harmonic balancer/timing mark is at 0 degrees. Pop the distributor cap. If the rotor is not pointing at the #1, or #6, terminal then most likely the timing chained has slipped and your cam (& ignition) timing is out the window. Then you can go from there. __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck Last edited by El Jay; 12-07-2009 at 02:49 AM.

12-07-2009, 11:18 AM	#27
OhOneWS6 Registered User Join Date: Dec 2009 Location: DFW, TX Posts: 764	Re: Code Blue! She's down! 911! Ditto what LJ Said. While you have the cap off use a socket to turn the crank clockwise until the rotor moves. Now turn the crank in the opposite direction and note how many degrees you have to turn it before the rotor moves. This will tell you how much the chain has stretched. __________________ 72 Cheyenne Super 1/2 LWB White/Dark Yellow 07 Avalanche 2LT 74 Sleek Craft Rebel Jet Boat W/Pontiac 400 Last edited by OhOneWS6; 12-07-2009 at 11:20 AM.

12-07-2009, 09:59 PM	#30
mikajo39 Gearhead and audio junkie Join Date: Aug 2008 Location: nunyah Posts: 452	Re: Code Blue! She's down! 911! Oh boy, this reminds me how my old engine left this world, went for a quick romp around town, idle back in, engine makes bad noises does the whole coasting thing and she was kaput, sad thing was it wasn't going more than 15 mph! I sheared my entire timing gear, piston kissed valves and the highest compression i could coax out of a cylinder was 80 psi, it was a bad day, but hey it was a great excuse for a new engine

08-27-2014, 10:30 PM	#32
Longhorn321 Size Matters Join Date: Aug 2007 Location: Lyman, SC Posts: 9,189	Re: Code Blue! She's down! 911! Soooooo....a mere 4 years and 8+ months later.... It's running again! Now for some tweakin, adjustin and such. Brakes are down (duh), radiator cap was squiting a lil when I was trying to get it running (weird?), STILL needs more tranny juice (6qts so far), needs exhaust, blah, blah, blah. I'm just happy to report that it actually moved under it's own power (into the garage...still gotta get the timing and mixture set). How's that for the slowest fix for a slipped timing chain ever?? __________________ "Reading the owners manual is only for quitters." Jason Harper, Bloomberg News. ...WOOOO HOOOO!!!!

08-27-2014, 10:34 PM	#33
Bobs68gmc Registered User Join Date: Aug 2013 Location: Hawk Point, Mo. Posts: 10	Re: Code Blue! She's down! 911! lmao. I started reading this and thought...... the date on this...... somebody accidently drug up an old thread....... then .... omg. I understand. well... glad to see you didnt give up all together!

08-27-2014, 10:42 PM	#34
sboris Registered User Join Date: Jun 2011 Location: Osceola, Ia Posts: 2,017	Re: Code Blue! She's down! 911! Hey man, its not a race, its a marathon! Right? Youll get it, keep plugging away.. __________________ Shawn 68 chevy K/20 05 chevy 3/4 4x4 71 short step-sold 71 chevy Beauville van My build. http://67-72chevytrucks.com/vboard/s...d.php?t=633039

08-28-2014, 08:50 AM	#35
Longhorn321 Size Matters Join Date: Aug 2007 Location: Lyman, SC Posts: 9,189	Re: Code Blue! She's down! 911! To be fair, I did fix more than the timing chain. Complete re-build and general clean up of the engine bay. I know, I know...that still doesn't normally take almost 5 years. What can I say, I'm slow. Life got in the way. No time, no money, blah, blah, blah.... __________________ "Reading the owners manual is only for quitters." Jason Harper, Bloomberg News. ...WOOOO HOOOO!!!!

08-28-2014, 09:36 AM	#36
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: Code Blue! She's down! 911! __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

08-28-2014, 09:54 AM	#37
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Code Blue! She's down! 911! Glad you gotter done man! Hope to hear it in person really soon. Ha!!!! __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

08-28-2014, 06:48 PM	#38
zeldman Registered User Join Date: Oct 2013 Location: Rt 66 Gallup, NM Posts: 527	Re: Code Blue! She's down! 911! So did you find anything broken in the engine? __________________ 2005 GMC K2500HD D/A 1993 GMC K1500 2011 Subaru Legacy. 2013 Subaru Outback 1970 C-10 2WD, SWB stepside, 292, TH350, PS, more rust than anything. God is my pilot.

08-28-2014, 09:36 PM	#39
1972RedNeck Registered User Join Date: Jan 2011 Location: Townsend MT Posts: 1,725	Re: Code Blue! She's down! 911! I don't believe it. Congrats on getting it going.

08-29-2014, 09:43 AM	#42
Longhorn321 Size Matters Join Date: Aug 2007 Location: Lyman, SC Posts: 9,189	Re: Code Blue! She's down! 911! Before shots. And one of my helper! __________________ "Reading the owners manual is only for quitters." Jason Harper, Bloomberg News. ...WOOOO HOOOO!!!!

08-29-2014, 09:52 AM	#43
Longhorn321 Size Matters Join Date: Aug 2007 Location: Lyman, SC Posts: 9,189	Re: Code Blue! She's down! 911! And now.... __________________ "Reading the owners manual is only for quitters." Jason Harper, Bloomberg News. ...WOOOO HOOOO!!!! Last edited by Longhorn321; 08-29-2014 at 10:09 AM.

08-29-2014, 10:02 AM	#44
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: Code Blue! She's down! 911! I'd say the chain slipped. I've only seen one other on a Chevy V8 and it bent the valves. Consider yourself lucky it wasn't worse. __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe



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