Broken push-rod

Tiny
CUSTOM BLUES
  • MEMBER
  • 1995 BUICK REGAL
  • 3.1L
  • V6
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
My car listed above is a custom 3100 Vin number M. My car was running rough and ticking. One day after work did a compression check which showed 150 on all cylinders except zero on number one took head. Had it fixed bent a valve and dropped a seat. I put it back together, it was running rough possibly mixed up a push-rod I did not know there were different sizes. On initial start up I noticed that one rocker arm was not moving as I looked closer I noticed push-rod broken and a half hanging by a thread. I think I put a long one instead of a short one there, replaced it been China just the rocker arms ever since with no success. Still shaky not running right. Decided to do a compression check again no compression number four cylinder. I am stumped very close to area where I broke the rod not 100% sure.
Friday, November 17th, 2017 AT 10:00 AM

4 Replies

Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
Perform a leakdown test in every cylinder. This will help isolate the issue to either the cylinder head or bottom end.

Also, can you post your compression results?
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Friday, November 17th, 2017 AT 1:25 PM
Tiny
CUSTOM BLUES
  • MEMBER
  • 3 POSTS
Cylinders number one, two, five and six tested 150 three was 125 and four was zero. I added a little oil in there and it was still zero. Blew compressed air n the number four it was exiting somewhere in a hurry but I could not tell where except I know some was exiting from the very top right behind the alternator. I guess it is some sort of vacuum line and some was definitely exiting through there. I want to rip the head off an get it over but want someone to tell me that is a must. I do not claim to be super mechanic but I can follow directions and get the job done. I have put two engines in and three head gasket jobs. I would think zero compression means to me it is a must. I have never done a blow down test or leak down whatever you called it, guess I could look it up. Thanks for answering I appreciate it.
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Friday, November 17th, 2017 AT 8:46 PM
Tiny
CUSTOM BLUES
  • MEMBER
  • 3 POSTS
Never mind I tore it apart. I guess when I broke that push rod I bent a valve. I think I can repair it myself.
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Sunday, November 19th, 2017 AT 9:56 AM
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
I’m glad you found the issue. If you bent a valve ensure that there isn’t excessive valve guide play. My professional opinion is send the cylinder head to a machine shop and have them do all the proper measurements and possibly a valve job depending on the condition of the valve seats. This will ensure no future compression/burning oil issues. Goodluck
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Monday, November 20th, 2017 AT 11:01 AM

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