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I recently rebuilt a Chevy 327 engine from the ground up.

Sent to Chevy Experts January 5 2007 at 10:39 PM
   

I recently rebuilt a Chevy 327 engine from the ground up. Upon trying to start the engine for the first time, I found that I have completely no compression. What could be causing this?

 

Customer (name blocked for privacy)
Status:  Closed   Value:  $9
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January 5 2007 at 10:40 PM (52 seconds later)
         
How did you set up your timing chain and gear markings?

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January 5 2007 at 10:42 PM (2 minutes and 38 seconds later)
         
No chain used, gear-driven instead. The CAM dot down, crank dot up.
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January 5 2007 at 10:50 PM (7 minutes and 22 seconds later)
         
How far down did you crank the rocker arm nuts?

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January 5 2007 at 10:54 PM (4 minutes and 27 seconds later)
         
To top dead center. Rolled motor until exhaust valve was completely open and set the rocker arm to zero lash and tightened a half turn. Etc. with all the others.
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January 5 2007 at 11:01 PM (7 minutes and 14 seconds later)
         
This has me just stumped........
Customer (name blocked for privacy)
Answer
January 5 2007 at 11:03 PM (1 minute and 17 seconds later)
         
ACCEPTEDCheck Mark

So all of the rockers were adjusted when the cam lobes were at their lowest point of contact with the rocker...right...

If so that only leaves the lifters pumping up too much or the rings aren't seating.

I would try setting the rockers at 0 lash and tighten them fully after it is started, if that dont do it......well you guessed it.

Give the rocker adjustment another shot, just make sure the cam is at its lowest point on every valve you adjust.

 

If you have further questions on this, just reply.

Thanks for asking!

V W

 



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January 5 2007 at 11:06 PM (3 minutes and 41 seconds later)
         
Reply to Virtual Wrench's Post: I have set the rockers at .005 lash and .0010 lash in addition to zero lash. If the rings didn't seat, wouldn't there be a little bit of compression? I just don't get it?????

Edited by XXXXX XXXXXXXXX on January 5 2007 at 11:16 PM
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January 5 2007 at 11:19 PM (12 minutes and 22 seconds later)
         
Need Info
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January 5 2007 at 11:20 PM (1 minute and 9 seconds later)
         
Any other suggestions?
Customer (name blocked for privacy)
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January 5 2007 at 11:26 PM (5 minutes and 36 seconds later)
         
REPLIED to Info RequestCheck Mark

 

The only thing left is the valves aren't seating....did you have the heads reworked?

I mean really...there are only a very few things that are needed for compression.

If the rings are sealing....and the valves are adjusted and seating..........all that's left is the timing........

Are you sure you didnt get a defective miskeyed cam or crank gear?



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January 5 2007 at 11:36 PM (10 minutes and 36 seconds later)
         
Reply to Virtual Wrench's Post: well if that was the case i think there would have been some sort of idication that would be obivious to me.
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January 6 2007 at 12:13 AM (36 minutes and 25 seconds later)
         
Yes, you sure would..

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January 7 2007 at 10:00 AM (1 day and 9 hours later)
         
Did ya get 'er going????

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