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Post Info TOPIC: "76 chevy 350 timing problem


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"76 chevy 350 timing problem
 


I have replaced the timing chain and cam on my 76 chevy truck. I used a melling MTC-1 cam. I cannot get it to fire up now. I have checked the TDC alignment several times. The double roller chain has 3 keyways for standard and 4 degrees advanced or retarded.  I used the standard marks. I believe I should have used the advanced mark. How do I know which way to index the mark. Do I turn the cam foreward or back?

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This should Help you with the Timing Chain Set setting . Also make sure your Distributor is in correctly and has 12 Volts Powering it up .

By changing the cam timing, enhancements to the camshaft characteristics can be achieved.  For example, retarding the cam timing will increase high RPM horsepower, and advancing the cam timing will increase low-end torque.  Click here to view complete instructions for our three keyway sets.





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Are you sure that your spark timing is right?....might be 180 degrees out

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I got under there again tonight and the #1 spark is firing at around 8 degrees advanced while cranking the engine. Both valves are closed at that position and still not a single pop, backfire or anything. Could the coil be too weak to fire it up, but still show a visible spark? I know parts fail when you take them off and they get tossed around whild doing rebuilds. I am very dissapointed that his thing will not even fire.

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If you are getting any spark, it should fire......Try new plugs...not just cleaning them, new ones....Have you checked for fuel and did a compression check?

BTW...it should run on any of those cam timing settings.

-- Edited by poncho62 on Wednesday 16th of February 2011 07:06:34 AM

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I have new plugs, cap and rotor. The wires are ok too. I tries to have a sit down one to one talk with the truck tonight. Took a couple of beers out to the drive and she just would not tell me what was wrong with her. Did I tell you this is my 18 year old daughter's 76 Chevy stepside truck. It is too much like her. I picked up a loaner compression tester and will hit it again on thursday evening. I am probably going to find I missed the timing chain alignment. I would not be the first shadetree mechanic to do so. Thanks for your input, and look for an update in the next couple of days.

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Guess what?!?!?!? No compression!

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Which cylinders?....If its all of them, something is really wrong, valves not opening and closing

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I only checked 1 and 3. I am pulling it all open again to reset the timing chain.  The valves are moving like they should. I hope I just set the chain wrong, too many late evenings working when I should be in bed. I also have not built an engine in almost 20 years. I dont count when I was in to vw bugs in my late 20's. Those things are a totally different animal.

-- Edited by Finley1006 on Friday 18th of February 2011 11:34:48 PM

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 I screwwed up!!! I ran the nuts down all the way on the rocker arms. I forgot how to properly set the arm position. I am going to set these properly and I am sure I have a truck on the road by the afternoon. I strive to learn from all of my mistakes. This is yet another one to add to the long list of lessons learned.



-- Edited by Finley1006 on Saturday 19th of February 2011 02:36:41 PM

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That will do it........good luck

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I have 2 bent push rods. What are the chances I did damage to the pistons or the valves?

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Finley1006 wrote:

I have 2 bent push rods. What are the chances I did damage to the pistons or the valves?



Not much.....Chevys have lots of clearance in that area......Probably just bent from overtightening.....I would slap a couple of replacemnets in there and try it.....If the damage is done, you are not going to make it worse now.....

 



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