Where does the spacer go that fell out from behind air filter back plate when I removed bolts

Usually, you have two washers between the plate and the pulley, and a third on the outside between the bolt and the pulley. The larger washer would go on first as a spacer.
You might want to check out another car to make sure.

If the bolt didnt break off in the compressor you can reinstall it..But there should be a spacer inside the face that fell offf.You need tha for the air gap

Replace the crank sensor.



The Crankshaft Position (CKP) sensor is mounted to the transmission bellhousing at the left/rear side of the engine block. The sensor is adjustable and is attached with one bolt. A wire shield/router is attached to the sensor.

REMOVAL

1. Disconnect sensor pigtail harness (3-way connector) from main engine wiring harness.
2. Remove sensor mounting bolt.
3. Remove wire shield and sensor.

INSTALLATION
New replacement sensors will be equipped with a paper spacer glued to bottom of sensor. If installing (returning) a used sensor to vehicle, a new paper spacer must be installed to bottom of sensor. This spacer will be ground off the first time engine is started. If spacer is not used, sensor will be broken the first time engine is started.

1. New Sensors: Be sure paper spacer is installed to bottom of sensor. If not, obtain spacer PN05252229.
2. Used Sensors: Clean bottom of sensor and install spacer PN05252229.
3. Install sensor into transmission bellhousing hole.
4. Position sensor wire shield to sensor.
5. Push sensor against flywheel/drive plate. With sensor pushed against flywheel/drive plate, tighten mounting bolt to 7 Nm (60 in. lbs.) torque.
6. Route sensor wiring harness into wire shield.
7. Connect sensor pigtail harness electrical connector to main wiring harness.

Working on 3.3Liter V6 Nissan Xterra, -Ok Take Neg Cable Off Battery,- Set motor to TDC Compression #1 #1 is front right Cylinder, -Remove Timing Belt, -Remove your timing belt tensior pulley, -Ok The Crankshaft Timing Sprocket take and remove outer spacer ring now take spray wd40 ect..behind gear try to get wd40 work between crank and gear i take hammer and gently knock the great back into the pump then i take crow feet and work the gear forward between the oil pump and the rear spacer ring then spray with wd40 and repeat process now if the lip of the spacer rings bends forward take straighten with vice and hammer, -Now time to drain Motor Oil,- Now Go to your right front Frame and remove 3 19mm head nuts off 19mm bolts from Idler Arm, push tires together Toe In, Watch your center link drop now you can began to remove your oil pan,Remove Starter, Remove the left bracket 14mm bolts and the right starter spacer Take Note: 14mm bolt just above the lowest starter bolt remove starter shim spacer, the 10mm bolts rear of oil pan 1/4 extiension and 1/4 10mm scoket -,The Motor mount 14mm nuts will have to be removed from the right mount almost all the way off your left drivers side mount, lift motor gently off right mount about 1 inch off the mount. Ok Remove Oil Pan From The Motor, Take Note 2 12mm head bolts right / left side of oil pump longest goes into alternator bracket, 4 10mm bolts 1 is hidden Lower right side Pump front now your oil pump will be loose to remove off pull forward to front of truck....I find that pouring Lucas engine oil stabalizer into the pump where oil filter mounts and turn pump until prime and take lithium grease and rub inside of front main crank seal..before installing new pump..!!! Take Note: if the crank sprocket gear is Stubborn I have seen Map Gas and i have seen holes drilled into front of gear, then Tapped and 2 bolt puller to remove the Sprocket but keep in mind your going to replace the pump so you can use a little force to get it to move just keep soaking with penatrating oil get it working back and forth....Hope this helps Oh yes Take Note: The converter Bolt Cover Will come out but the Engine - Transmission Spacer plate Will Stay in Place.I have seen tech take cutoff wheel and cut the engine Transmission Spacer Plate Where Starter Sits In And The left Side And Place it back into place where the bellhousing bolts hold it back in place but you should not have to do this..just thought it intersting...Dyi Nissan Xterra 3.3liter V6 Oil Pump R&R......

starter is located behind the motor under the intake manifold, to replace remove the battery cable & air filter box and remove 2 15mm bolts that go through the bell housing into the starter then get under the car and remove 4 10mm nuts & bolts that attach a plate from intake to the block then remove 1 more 15mm bolt holding starter in and pull it back then nose first down then remove 10mm and 13mm nuts on starter solonoid removing cable and wiggle it out past the half shaft and vualla its out

On a 1997 blazer, how to remove drivers side mirror
under your handle to close the door is two 7mm bolt and behind your handle to open the door is a philips screw and that plate behind it comes off then CAREFULLY remove the door panel trust me you dont want to break the plastic then you will see your mirror bolts and electrical wiring

First check to see if you have enough coolant. If you are sure of this, The clutch to the air conditioner may not be kicking in when it should. This may be caused by the air gap being too large.

Carefully take the clutch off of the front of the AC unit being careful not to drop the 3-4 bolts. Behind it you will see a spring clip with spacers. By removing one of the spacers, it makes the gap between the clutch plate narrower so that the electromagnet can engage the clutch. This worked on my 1997 Dakota. Air would kick on and last for 15 minutes before it would smell musty. I would wait for another half hour then turn on again. The clutch was disengaging. May or not work for yours.

the knocking noise is caused by the pads walking. the shims that fell out go 1 ontop and 1 on bottom.you will have to take the caliper back off that is the 2 14mm. bolts one is longer than the other so pay close attention .once removed the spacers should half should slide on the knuckle assembly 1 up 1 down .then slide caliper back over. thanks!

Once the internal welds are broken, the only fix is to cut a small hole in the frame. Use a hole saw, angle grinder or similar. Make up a replacement panel with the required spacer/nut welded in behind, and weld in the new panel section. If you don't have access to a MIG welder, you'll need to find someone local who does.

loosen the clamp at the throttle plate, remove two 10mm bolts from intake resionator, rewove pcv fresh air tube, loosen clamp on resionator to filter housing, remove 10mm bolt at top of filter housing, remove filter housing, open housing remove filter install new filter and reverse process.