Ford 1.8D auxiliary belt keeps slackening off. have wondered if there should be a lock nut fitted?

There are no timing marks on this engine - the engine has to be "locked" using special engine locking / setting kit which you wil have to obtain to do the job.

I will give you the instructions to do the job for when you have the locking kit to do the job.. as follows:

Removal

1. Raise and support front of vehicle.
2. Remove:
   • • RH front wheel.
     • RH inner wing panel.
     • Air filter assembly.
3. Support engine.
4. Remove:
   • • RH engine mounting and bracket.
     • Timing belt upper cover,
     • AC receiver/drier (if fitted). DO NOT disconnect hoses.
     • Timing belt lower cover.
     • Auxiliary drive belt.
     • Support bracket between gearbox and cylinder block (Palio).
5. Palio: Remove bell housing cover plate. Fit flywheel locking tool. Tool No.1.867.029.000. or equivalent commercially available.
6. Remove:
   • • Crankshaft pulley bolts
     • Crankshaft pulley
     • Spark plug leads.
     • Ignition coil and bracket.
     • Spark plugs.
7. Fit dial gauge and adapter to No.1 cylinder. Tool No.1.860.895.000.
8. Turn crankshaft to TDC on No.1 cylinder. Set dial gauge to zero.
9. Ensure notch in rear of camshaft aligned as shown.
10. Install camshaft aligning tool. Tool No.1.870.823.000
11. 
    NOTE: If camshaft aligning tool cannot be fitted: Turn crankshaft one turn clockwise.

Installation

1. Ensure No.1 cylinder at TDC by turning crankshaft slightly clockwise and anti-clockwise. Use dial gauge .
2. Ensure camshaft aligning tool fitted correctly
3. Hold camshaft sprocket. Use tool No.1.860.831.000/001
4. Slacken camshaft sprocket bolt
5. Fit timing belt in following order:
   • • Crankshaft sprocket.
     • Water pump sprocket.
     • Camshaft sprocket.
     • Tensioner pulley.
   NOTE: Observe direction of rotation marks on belt.
6. Fit tensioning tool locating pegs to tensioner pulley holes -Tool No.1.860.745.100/300. Ensure tensioning tool arm is horizontal.
7. Set weight at 70 mm mark on scale bar.
8. Hold camshaft sprocket
9. Tighten camshaft sprocket bolt - Tightening torque: 70 Nm.
10. Remove aligning tool
11. Turn crankshaft two turns clockwise.
12. Ensure No.1 cylinder at TDC by turning crankshaft slightly clockwise and anti-clockwise. Use dial gauge
13. Ensure camshaft aligning tool can be fitted - If not: Repeat installation procedure.
14. Tighten tensioner nut to 28 Nm
15. Remove:
    • • Tensioning tool
      • Camshaft aligning tool
      • Dial gauge
16. Install components in reverse order of removal.
17. Tighten crankshaft pulley bolts - Tightening torque: 20 Nm + 90°.

this model is simple ,14mm ring spanner on idles /tensioner with another spanner locked into the back and turn the nut anticlockwise to take the tension ,also on these models is another idler with a nut and 1/4 drive square after fitting the belt then you can adjust the tension a bitwith this one sometimes with anew adjuster tensioner i slacken this first as well when fitting the belt .

if htis is the zetec engine then its quite simple ,just slacken and remove the fan belt by turning tensioner with a spanner clockwuase and this will release the tension so belt can be slipped off.then their is one bolt and two nuts ,remove the bolt and then the nuts on teh two studs ,then with a torx socket remove the long studs that had the nuts on and it comes off quite easy

Underneath the alternator facing forward is a 13 mm nut which locks the alternator in place, slacken this off and the two nuts/bolts where the alternator pivots.From the left side of the car there is a 10 mm bolt which is the tensioner, slacken this untill the alternator can be moved towards the engine sufficiently to remove the belt .Reverse this procedure to replace the belt. (depending on drives to other items you may have to remove their belts as well)

slacken off the 3 bolts that hold the alternator in place and swing it inwrds towards the engine,then fit belt and swing alt out,wedge sometjhing behind the alternator to get the tension and tighten bolts.

hi from uk the cambelt/timing belt comes as a kit ie timing belt and tensioner cost £50 here in uk ? it is not too difficult diy job approx 2hours the engine must 1st be set to TDC number 1 firing then at this setting the cam cog mark is a hole drilling in the web of cog and should line up at 12 oclock upwards and using a mirror look thro drill hole and you will see a vertical notch/groove behind on font engineface this is correct mark the crank cog mark lines up with aother mark on engine front face at approx 12 30 pm oclock ? if now set you slacken tensioner bolts and push t/pully away to left from belt ? then remove belt next remove complete tensioner assy after undoing bolts then fit new tensioner push t/pully to left from belt run and lock bolt/s recheck t/marks then fit new belt from c/shaft in anticlockwise rotation when fitted release tensioner bolt and allow to tension belt push t/pully onto belt and lock up tensioner bolts20=27 Nm rotate engine manually for four turns then recheck marks ? should still aligne then re assemble torque crank bolt to =140-150 Nm A LITTLE HINT ? b4 you remove the water pump belt ? slacken thefour 10 mm headed bolts (spanner size) that secure w/pump pully to pump it will be easier to halt rotation of pully if you holt belt tight by hand this pully has to come off to remove c/belt covers same for power steer belt which is also driven from the w/pump pully the power steer pump slide adjuster has a 12 mm bolt you slacken and best done with open end spanner ? after slackening the pump mounting bolts/nuts underneath pump hope you can follow this info/tips wish you good luck from uk

It will be necessary to replace the belt before it breaks and leaves you stranded. Good Luck! I hope you find this to be very helpful!

Disconnect battery earth lead. Do not turn crankshaft or camshaft whn timing beld removed. Remove spark plugs to ease turning engine. Turn engine in normal direction of rotation (unless otherwise stated) Do not turn engine via camshaft or other sprockets. Observe all tightening torques. Remove engine, remve RH engine mounting. Remove auxiliary drive belts, water pump pulley, crankshaft pulley, timing belt upper cover, timing belt lower cover. Turn crankshaft clockwise to TDC on No. 1 cylinder, slacken tensioner bolts 5 & 6. Move tensioner away from belt and lightly tighten bolts. Remove timing belt. Remove water pump and replace with new one. Suggest to replace cambelt as well.
Installation
Ensure timing marks aligned3 & 4. Fit timing belt in anti-clockwise direction, standing at crankshaft sprocket. Ensure belt is taut between sprockets on non-tensioned side. Slacken tensioner bolt 5. slacken tensioner bolt 6. Allow tensioner to operate. Tighten tensioner bolt 6. Tighten tensioner bolt 5. Turn crankshaft on turn clockwise. Ensure crankshaft sprocket timing marks aligned 4.
Slacken tensioner bolt 5. Slacken tensioner bolt 6. Allow tensioner to operate. Tighten tensioner 6. Tighten torque: 20 - 26 Nm. Tighten tensioner bolt 5. tighten torque: 20 - 26 Nm. Apply thumb pressure to belt at middle. Approximately 5kg. Belt should deflect to 1/4 of tensioner bolt head width 7. Belt tention can also be set using burroghs (BT-33-73F) tension gauge 10 at middle. Turn crankshaft 90 ° anti clockwise. Check belt tension is 9.5 16,5kg (engine must be cold). Install components in reverse order of removal. Fit cranckshaft pully. Tighten crankshaft pully bolts 8. G4-J: Tightening torque: 12-15Nm.
G4-N/G4-k: Tightening torque: 10-12Nm
G4EA: Tighten crankshaft pully bolt 9. Tighten torque: 140-150Nm.

Dear Friend
Removal: Support engine: remove -engine mounting, auxiliary drive belt, water pump pulley, crankshaft pully bots & crankshaft pully, timing belt covers....turn crankshaft to TDC on No 1 cylinder, ensure crankshaft sprocket, camshaft sprocket, oil pump sprocket & balancer shaft sprocket timing marks lighned. Pls note: Timing marks on camshaft sprockets should align with cylinder head uppter face, dowl pins on camshaft sprockets should face downwards....Slacken tensioner botl. Move tensioner away from belt & tighten bolt.
Remove: automatic tensioner unit bolts, automatic tensioner unit, timing belt, crankshaft bolt, crankshaft sprocket, crankshaft sprocket guide washer...slacken balancer shaft belt rensioner bolt, move tensioner away from belt & lightly tighten bolt...Remove balancer shaft belt.

Installation:
ensure timeing marks aligned.Note: Timing marks on camshaft sprockets ahould align with cylinder head upper face, exhaust sprocket mark is on recess but inlet sprocket mark is on tooth. To check oil pump sprocket positionded sorrectly: remove blanking plug from cylinder block, insert 8mm diameter Phillips screwdriver in hole. ensure screwdriver is inserded 60mm from face of cylinder block. If screwdriveer can only be inserted 20mm-turn oil pump sprocket 360". Inset screwdiver again.
Fit balancer shaft delt in anti-clockwise direction starting at crandkshaft sprocket....Slacken balancer shaft belt tensioner notl, turn tensioner clockwise to tension belt. Tighten bolt to 15-22 Nm... Applu thump pressure to belt at tentioner, belt should deflect 5-7mm. If not: Repeat tensioning procedure.... Install - chankshaft sprocket guide washer & crankshaft sprocket.
Thighten crankshaft centre bolt, tightening torque:110-130Nm. Please note, ensure crankshaft sprocket guide washer is fittet correctly. oil threads & contact face crankshaft botl before fitting.

first of all you need to find the power steering adjuster you will find this beside power steering pump there is a locking nut on pulley slacken that then slacken off adjusters once you have done that you will be able to remove belt same applies for slackening alt belt make sure you slacken of locking bolt otherwise you will bend adjuster bolt.hope this helps you.