Can you show me where yhey are? My villager as well has loose motor mounts, but you do not tighten them. You have to replace them. Th rubber is what fails and then the bolt just bounces arround in the loose rubber that used to hold it in place. Once one goes, all are subject to increases stress and impact and the rest will fail quickly. I am going to replace all of mine so the problem doesn't reoccur in 4 months. Get a repair manual, the procedure will be in there.
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Lower engine in bay, loosely attach motor mounts. Install transmission, mate to motor. Install transmission mounts, tighten motor mounts.
Hook up wiring and hoses. Fill all fluids. Reinstall driveline, hook up exhaust and linkage. Reinstall hood. Test work, check timing and carb settings.
if the engine is loose, i would check the motor mounts to see if 1 of them is not broken, if it is , it will have to be replaced, if it is loose, then it can be tightened up. with the appropiate size wrenches. if the knocking sound is coming from the inside of the engine, i would have it checked out soon to see what is causing the knocking. [ interior knocking in a engine is serious. ]
There are several things that can cause this. A bad U-joint in the driveshaft, a really bad differential
pinion bearing. Loose rear wheel lugnuts. A broken motor mount or very loose front tierod ends.
If any of these break while you are driving you are going to have a very bad day. A frame and axle shop is what you need. You can tighten the lugnuts yourself, you can jack up the front end of your car, one side at a time and check the tierod ends if you know good from bad.
The U-joints may show a rust powder on them and the undercarraige of the car, or it may have a grease trail. If you know how to replace a U-joint its certainly a home repair. The motor mount can be lifted with a prybar and visually inspected. For the differential, it takes special tools and training with micrometers to refit the parts.
I imagine if a "check engine" light has lite up, you would tell us, so the problem is not with the engine. Do not wait too long to fix this, it sounds dangerous.
tightening is not usually the issue. If they are loose, it's probably because the rubber has separated and you will need new mounts. They are not too difficult to replace, but you do need to know your way around a wrench, and you will need a floor jack to hold the engine up while changing them. First jack the engine a bit on a hard point (you can jack on the oil pan if you put a block of wood on your jack) to see what, if any, of your mounts has broken.
I don't have the manual for your car, but there is usually one mount right in front of the engine between the serpentine belt and attaching to the right fender well. Another one is usually going from the lower part of the engine to the radiator support. There may or may not be a third mount on the engine, but there will probably be one on the tranny somewhere too. have I totally confused you? Let me know if you have questions.
The Motor raising up issue is, you may have a worn or broken Engine or Transmission Mount, inspect the mounts by having someone or you, look at the mounts while someone else puts the car in gear. If you see the mounts move excessively, than the mounts need to be replaced. The whining or squealing Fan Belt may be a worn, glazed or loose belt. I would inspect the belt and tighten or replace as needed.
Sounds like a possible motor mount loose or broken, but hard to say.
Open hood, put car in drive, hold foot tight on brake pedal don't let off the brakes, accelerate slightly, if the mount is broken engine should lift up on the right side looking out the drivers side windshield, and show signs of the fan blades hitting the black plastic fan shroud in front of the radiator.
A car lift is the easiest and safest way to gain access for replacement of a broken engine mount.
You need to loosen the motor mount slightly--just a full turn or two. Place a jack under the oil pan and lift the engine until the strain is relieved on the motor mount and finish removal. Replacement installation is the opposite except you'll want to tighten the new motor mount into place fully (if possible) before lowering the jack.