I have a 2007 Silverado 5.3 LT Z71 with the LH6 AFM aluminum block engine. At 156,xxx I had the engine rebuilt due to the oil consumption issue (1qt every 1000-1100 miles). Had an aftermarket warranty that paid for the rebuild after doing the consumption test recommended by GM. While doing the consumption test GM replaced the Left Valve Cover and put the shield in the oil pan. After the rebuild the oil burning issue is gone with a little over 30K miles driven.
Now I have a few issues that are minor in comparison but still issues. For this I am trying to tackle a exhaust manifold bolt issue. The shop that rebuilt the engine did a number that was covered up until recently. On the driver side rear the bolt must have snapped or broke off which is normal. The drill job they did now is not normal. They put a helicoil in but they obviously did not use a right angle drill. The hole was not deep enough and not straight. They also widened the opening killing any chance of a good seal. I found this while installing a set of headers. I had a slight leak but it didnt stay that way.
I ordered an oversized threadsert from McMaster Carr and did my best to correct the mess they made when I drilled it out. The insert went in fine after rethreading. I used an OEM metal gasket and torqued it down with new oem bolts. But still have a leak.
I am almost at a point to of the head off to fill in the hole and retap, but that is the last thing I want to do at this point. Any ideas about how to fill in the edges around the threadsert to get a good seal?
Now I have a few issues that are minor in comparison but still issues. For this I am trying to tackle a exhaust manifold bolt issue. The shop that rebuilt the engine did a number that was covered up until recently. On the driver side rear the bolt must have snapped or broke off which is normal. The drill job they did now is not normal. They put a helicoil in but they obviously did not use a right angle drill. The hole was not deep enough and not straight. They also widened the opening killing any chance of a good seal. I found this while installing a set of headers. I had a slight leak but it didnt stay that way.
I ordered an oversized threadsert from McMaster Carr and did my best to correct the mess they made when I drilled it out. The insert went in fine after rethreading. I used an OEM metal gasket and torqued it down with new oem bolts. But still have a leak.
I am almost at a point to of the head off to fill in the hole and retap, but that is the last thing I want to do at this point. Any ideas about how to fill in the edges around the threadsert to get a good seal?