I am having a new issue (or if it isn't new, it wasn't as noticeable previously) where I am getting a fair vibration with the engine turning at about 2200-2500 RPMs, regardless of whether or not I am moving. I have not noticed anything outside of this range, either lower or higher RPMs. I can be driving or sitting with the clutch depressed and revving the engine and the vibration will still occur. I have had the engine replaced (with another I6 4.0L, approx same mileage-50k) approximately one year ago due to excessive water in it and, at the same time, I had the clutch changed. I had to bring it back shortly after since the throwout bearing was ticking and the throwout bearing was changed again. I have not performed any other maintenance on the engine except for the routine oil changes and have only put approximately 6-7k on the engine since.
I have done searches and many seem to point in the direction of the torque convertor (bolt being loose) or a motor mount. However, I didn't think that a manual transmission has a torque convertor. Are there any other ideas of things that I could look for which could be causing this?
Thanks, I will check those. But could the vibration go away at higher RPMs with bad motor mounts?
yes, any time you have a spinning force, there will be optimal spinning rates and less optimal ones.
think of a u-joint going bad in a ds, most of the time, the vibes are only felt at a certain speed, because the shaft is spinning at a rate that is less optimal and is putting more stress on the u-joint
Checked the mounts and they all look fine. The tension on the belt looks good but I haven't gotten a chance to check to see if anything that the belt is on seems like it is having a problem.
I was recommended to check to make sure that the one or more of the bolts holding the flywheel hasn't worked loose since the clutch was changed when the engine was replaced last year. Looks like my weekend may be a fun one.
I wouldn't rule it out however I brought it to someone to save time that I didn't have to troubleshoot it effectively. Of course, I didn't know that I was going to be let go from my job yesterday afternoon but that's ok. I am putting all of my time towards finding a new job right now.
Got the Jeep back yesterday and they couldn't figure it out. However we have eliminated anything that is run by the belt and they said that they didn't see anything wrong with the crank balancer. So now I am looking into it again. At least I have been plenty of time since I am only job hunting right now.
Did they look at the clutch? There's a cover on the front of your transmission that can easily be removed so you can at least see if there's anything out of the ordinary with the flywheel.
I haven't pulled the cover off of it but it looked a bit more difficult to pull off.
On another note, I spoke with a friend of the family and he said that he would first check the harmonic balancer as they sometimes slip. It looks pretty easy to get to however I don't know how yet how I would keep it from spinning while I try to turn the bolt. However, since I would also be possibly turning the crankshaft (?) at the same time, is there anything I should be concerned about if I try to pull and replace this?
The harmonic balancer is the "crank balancer" you said the mechanic checked.
The transmission dust shield is not difficult to remove. I think you should do this next.
I would consider getting a second opinion. Engine vibrations that you can notice from the driver's seat should be easily diagnosed by a competent mechanic. Unless you told him only to look at the serpentine belt...
Well, after more than two weeks and ultimately having to bring it to someone, I have an answer as to what it was. We changed the harmonic balancer as the rubber was beginning to crack but that didn't resolve it. The flywheel looked to be good as well. The problem was with the clutch, particularly with the pressure plate not being balanced. It was likely happening since the clutch was replaced last year and I just didn't notice it until recently or was thinking that the vibration I felt was a driveline vibration which I have been chasing and unable to resolve because I was incorrectly diagnosing it.
Be very careful with the wife mod. Uninstallation can be extremely expensive. Wife mods have been known to take the Jeep and all other mods during the uninstall process. Also, make sure you service your wife mod properly as often as humanly possible. Wife mods not properly serviced may malfunction or uninstall themselves at any time.