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Old 02-01-2011, 07:29 PM
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70 gmc missing rod and lifter

So I heard a interesting lifter tick and decided to pull the valve cover to find out what it was. There was no rod on cylinder 6, one of them was missing! When looking down the guide I could see the CAM. No lifter either!

So I took the intake off and found the missing rod and lifter, no damage to the lifter so i put a new one back in along with a rod. Now After putting everything back together I cannot get it to start!

It just back fires out the exhaust, So i put it at TDC and adjusted the cap to the 1st cylinders sparking point and still no love! I have pulled the valve cover off and verified both #1 valves are closed when at TDC, I understand it couldve been at the exhaust TDC when i first did it.

New plugs, gapped right, new wires, all spark tested, I will spray some wd40 in the dizzy cap to see if i cant get it running that way but still...

What else could cause this??

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Old 02-02-2011, 03:53 AM
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Bent valve?.......
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Old 02-02-2011, 05:14 AM
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Quote:
Originally Posted by dissinnick
When looking down the guide I could see the CAM. No lifter either!
Hopefully it didn't run too long like this- the missing lifter would cause a drastic internal oil leak along w/a drop in pressure.
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Old 02-02-2011, 08:14 AM
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Here is an excellent post on how to install a distributor and trouble shoot. Read what Docvette has to say, about the third post down.
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Old 02-02-2011, 08:15 AM
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Throwing a pushrod and lifter is pretty wild. It happens, but not often without major issues. You need to get back to basics, and start with checking spark when cranking. If it's got spark, then you need to verify that the timing is correct. Once you've verified all that, then you need to do a compression check on all 8 to see if you're losing compression.
After all that, then you can spray WD40, or try other things. Just don't jump aropund randomly. Troubleshooting needs to be done in a manner that elimnates certain issues.
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Old 02-02-2011, 08:30 AM
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if it backfires, you got spark... yet your firing order is wrong or the distributor is 180 out
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Old 02-02-2011, 09:33 AM
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Quote:
Originally Posted by dissinnick
So I heard a interesting lifter tick and decided to pull the valve cover to find out what it was. There was no rod on cylinder 6, one of them was missing! When looking down the guide I could see the CAM. No lifter either!What else could cause this??
Interesting that you had a lifter tick with no lifter in the bore
Did you check the rocker stud height to be sure it didn't pull out from the head, or do you have screw in studs? Your engine must have had one bad miss huh?
If you find the engine is not TDC #1 compression, but in fact TDC exhaust, you can simply rotate the engine one full turn till the timing mark comes back to TDC on the timing tab, pull the dist. cap, and re-do the firing order with #1 on the tower where the rotor is pointing without having to pull the dist again. Good luck.
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Old 02-02-2011, 10:45 AM
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Quote:
Originally Posted by h0trod389
if it backfires, you got spark... yet your firing order is wrong or the distributor is 180 out
Oops! Missed the backfiring part! Or it could mean the timing chain jumped a sprocket too!
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