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#1 |
Registered User
Join Date: Jun 2007
Location: Dayton, Ohio
Posts: 95
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Jumped Timing..???
![]() I was looking to rebuilding the 455 buick in my 70 C10 this winter. It leaks in a couple spots, I dont know the age or miles, and I just figured I'd finally rebuild one for the first time. I was planning for these in the Dec/Jan timeframe. However....... Today, I was getting a little ![]() After the insurance towed it home (thank goodness I added that extra 2.00 a month on the policy), I determine that fuel is getting to the carb (has electic fuel pump and I can see it) and I pulled the number 1 spark plug and I am getting spark (has HEI distributor). When I try to start it sounds like it wants to start, spits and sputters but cannot get itself running. It might limp along for a couple seconds and die again. Giving it gas tries to make it better but it cant hang in there. There are no major bangs, knocks, or crashes... Is it possible I jumped the timing chain?? Whats the best next step? I am tinkering with determining the compression stroke and finding TDC for #1 cylinder, then lifting the cap to see where the rotor sits but I dont have all the tools or prior experience...just operating on my own analysis... Any tips or secrets of the trade?? Oh yeah, I just bought the truck 4 months ago..... ![]() Thanks for any advice....Tank |
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#2 |
Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: Jumped Timing..???
I'd say it either jumped time or the distributor worked loose and moved.
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#3 |
Registered User
Join Date: Jun 2007
Location: Dayton, Ohio
Posts: 95
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Re: Jumped Timing..???
Oh yeah, I looked at distributor hold down and it looks to be in the same spot. You can see the groove and marks from where it sits. Tank
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#4 | |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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Re: Jumped Timing..???
Quote:
I'm no expert, but there are plenty on here, someone will help you out w/ this ![]()
__________________
Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#5 |
Senior Member
![]() Join Date: Jul 2006
Location: Leander, Texas
Posts: 850
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Re: Jumped Timing..???
Where is your timing currently?
Does it drag at all when you try to start it? Jumping a tooth is rare but possible. |
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#6 |
Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: Jumped Timing..???
I've had one jump time and while trying to adjust the dizzy to get it drivable, it jumped again as soon as it got enough combustion on the power stroke. I had to get a new timing set. If you can get it running better by guestimating with the dizzy (the balancer mark won't be close), it won't be long before it jumps again.
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