Broken push-rod

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.

4 Replies

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

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.