Muad'Dib
NAXJA Forum User
- Location
- Bend, Oregon
As the title states i have some questions about replacing one of the exhaust manifold studs.
A bit of history first:
1990 I6 (RENIX) 187,000
I have been experiencing a problem with low idle. It only happens after the vehicle is started. It doesnt matter if the vehicle is hot or cold. It will always happen after the vehicle is started. The RPM's go down to the first line or below on the guage for about 5 seconds then idle resumes normally. It does this for about 5 minutes then goes away. The jeep never dies (amazingly), but you can tell that its barely running.
After reading on here about how to fix idle problems (i had a high idle problem in the past) i concluded that this particular problem was caused by my manifold bolts coming loose. I was able to get some of them tight again, but i had to wait for awhile to get at a couple of them so that i could get a ratcheting box wrench (or known to some as a ring spanner). I got one the other day, and i was able to get the rest tight except for the one closest to the firewall which turns out to be a stud with a bolt. When i would tighten this one, it would feel as though it was getting tighter then get loose again. Pretty abvious the stud is broken.
So now i know that i need to remove the stud and replace all the bolts / studs and nuts with new hardware (after reading even more usefull information here).
Here are my questions:
1: ) When doing this job, should i also replace the exhaust manifold if it does not have any cracks in it? Since a part of the manifold was not tightened well, could this cause it to warp? Or should it be fine to re-use. If not then would this be a good replacement:?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=021&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=310000335622&rd=1
2: ) If i can get to the stud and remove it (which i doubt ill be able to do) without removing the head, should i go ahead and remove the head and replace the head gasket since ive got it torn down this far anyway? The head gasket has no problems right now, but it has never been replaced (from what i can tell).
2.5: ) If you say i should go ahead and replace the head gasket at the same time would it not be a bad idea to also replace the lifters and pushrods?
(BTW Im definetely replacing the injectors at this time)
Thanks for the help!
A bit of history first:
1990 I6 (RENIX) 187,000
I have been experiencing a problem with low idle. It only happens after the vehicle is started. It doesnt matter if the vehicle is hot or cold. It will always happen after the vehicle is started. The RPM's go down to the first line or below on the guage for about 5 seconds then idle resumes normally. It does this for about 5 minutes then goes away. The jeep never dies (amazingly), but you can tell that its barely running.
After reading on here about how to fix idle problems (i had a high idle problem in the past) i concluded that this particular problem was caused by my manifold bolts coming loose. I was able to get some of them tight again, but i had to wait for awhile to get at a couple of them so that i could get a ratcheting box wrench (or known to some as a ring spanner). I got one the other day, and i was able to get the rest tight except for the one closest to the firewall which turns out to be a stud with a bolt. When i would tighten this one, it would feel as though it was getting tighter then get loose again. Pretty abvious the stud is broken.
So now i know that i need to remove the stud and replace all the bolts / studs and nuts with new hardware (after reading even more usefull information here).
Here are my questions:
1: ) When doing this job, should i also replace the exhaust manifold if it does not have any cracks in it? Since a part of the manifold was not tightened well, could this cause it to warp? Or should it be fine to re-use. If not then would this be a good replacement:?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=021&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=310000335622&rd=1
2: ) If i can get to the stud and remove it (which i doubt ill be able to do) without removing the head, should i go ahead and remove the head and replace the head gasket since ive got it torn down this far anyway? The head gasket has no problems right now, but it has never been replaced (from what i can tell).
2.5: ) If you say i should go ahead and replace the head gasket at the same time would it not be a bad idea to also replace the lifters and pushrods?
(BTW Im definetely replacing the injectors at this time)
Thanks for the help!