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1986 Other Cadillac Models no compression after head job

Tiny
ZAKKATTACK
  • MEMBER
  • 1986 CADILLAC
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
86 caddy cimarron with a 2.8 V6. Recently just did both heads with rebuilt ones. Well upon starting, it will just crank and crank without turning over. I checked and made sure I had the distributor aligned right. Did the whole #1 cylinder at TDC. Align the rotor to #1. When getting TDC you could feel it coming up on the compression stroke. So I knew at the time there was compression. After much reading and attempts to fix the problem, I decided to check compression. I have no compression at any cylinder! When I turn the crank though it feels like it there is compression though. What did I do wrong? Please help!
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Thursday, January 24th, 2008 AT 5:12 PM

2 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
You say the pistons are going up in down? Next thing to check is to take off the heads and make sure the valves are seated properly and holdling pressure. If that is good verify that the timing marks are properly lined up on the crank and cam shaft.

If those are good then either the heads are no good and warped, the headgasket is no good, or they are not bolted down properly.
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Thursday, January 24th, 2008 AT 5:40 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
That engine has 2 different length push rods, be sue the long ones are on the exhaust valves, short on intake. Sometimes they take a little bit to bleed down the lifters, until they do the comp can be all over the place
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Friday, January 25th, 2008 AT 8:09 AM

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