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Timing a Ford 7500 turbo backhoe involves adjusting the timing of the engine's fuel injection pump. Here are the general steps to time a Ford 7500 turbo backhoe:

1. Locate the timing marks: Look for the timing marks on the engine's flywheel and the timing cover.
2. Clean the timing marks: Clean the timing marks to ensure they are visible and easy to read.
3. Rotate the engine: Rotate the engine in the direction of normal rotation until the timing mark on the flywheel lines up with the pointer on the timing cover. This indicates that the engine is at Top Dead Center (TDC) on cylinder number one.
4. Remove the fuel injection pump: Remove the fuel injection pump from the engine.
5. Adjust the timing: Rotate the fuel injection pump until the timing marks on the pump housing line up with the timing marks on the engine. The exact timing specifications may vary depending on the engine and fuel injection pump model.
6. Reinstall the fuel injection pump: Reinstall the fuel injection pump and secure it in place.
7. Verify the timing: Rotate the engine again to make sure the timing marks still align correctly.
8. Test the engine: Start the engine and test it to ensure that it runs smoothly and efficiently.

It's important to follow the specific procedures and timing specifications provided in the engine's manual or by a qualified mechanic. If you're unsure about timing your Ford 7500 turbo backhoe, it's recommended to consult with a professional mechanic or technician.

To set the timing on your 1991 Nissan truck, follow these steps:

1. Locate the timing marks on the engine. They are usually located on the front of the engine, near the crankshaft pulley.
2. Remove the timing cover if necessary to access the timing marks.
3. Check the engine's specifications to determine the correct timing setting. This information can be found in the owner's manual or a repair manual.
4. Connect a timing light to the battery and to the number one spark plug wire. The timing light will allow you to see the timing marks more easily.
5. Start the engine and let it warm up to operating temperature.
6. Aim the timing light at the timing marks on the engine and observe the marks as the engine runs.
7. Use a wrench to loosen the distributor bolt slightly.
8. Rotate the distributor slightly to adjust the timing until the marks line up with the specified setting.
9. Tighten the distributor bolt once the timing is set.
10. Recheck the timing to ensure it is still set correctly.
11. Turn off the engine and disconnect the timing light.
12. Reinstall the timing cover if it was removed.

If you are not comfortable performing this procedure, it's best to take your truck to a qualified mechanic for timing adjustment.

There is a Toyota Technical Service Bulletin issued for this:-
T-SB-0291-08 September 11, 2008 2GR-FE Valve Timing

Procedure Service Category Engine/Hybrid System Section Engine Mechanical Market USA Applicability YEAR(S) MODEL(S) ADDITIONAL INFORMATION 2005 - 2009 Avalon 2007 - 2009 Camry VDS(s): BK46K 2008 - 2009 Highlander 2006 - 2009 RAV4 Engine(s): 2GR VDS(s): BK31V, BK32V, BK33V, BK34V, ZK31V, ZK32V, ZK33V, ZK34V, ZK35V 2007 - 2009 Sienna Introduction This service bulletin provides information regarding valve timing inspection and service guidelines for vehicles equipped with 2GR-FE engines. © 2008 Toyota Motor Sales, USA Page 1 of 5 T-SB-0291-08 September 11, 2008 Page 2 of 5 2GR-FE Valve Timing Procedure Introduction (Continued) Figure 1. 3 2 1 5 9 8 7 6 4 1 RH Bank Intake Camshaft Timing Gear 2 RH Bank Exhaust Camshaft Timing Gear 3 RH Bank No. 2 Timing Chain 4 Crankshaft 5 Idler Gear 6 Timing Chain 7 LH Bank No. 2 Timing Chain 8 LH Bank Exhaust Camshaft Timing Gear 9 LH Bank Intake Camshaft Timing Gear Warranty Information OP CODE DESCRIPTION TIME OFP T1 T2 N/A Not Applicable to Warranty © 2008 Toyota Motor Sales, USA T-SB-0291-08 September 11, 2008 Page 3 of 5 2GR-FE Valve Timing Procedure Inspection 1. Set the No. 1 cylinder to TDC/compression. A. Set the timing mark to 0 on the timing chain cover by rotating the crankshaft clockwise. B. Verify the timing marks on the camshaft timing gears are in general alignment with the timing marks of the camshaft bearing cap: TIMING MARK IDENTIFICATION CYLINDER BANK INTAKE GEAR MARK EXHAUST GEAR MARK RH Bank (Bank 1) Small Mark Single Line LH Bank (Bank 2) Large Mark Double Line HINT When the engine is correctly timed, the timing marks will NOT perfectly align. Figure 2. Figure 3. RH Bank Exhaust Camshaft Timing Gear 1 2 1 Bearing Cap Timing Mark 2 Gear Timing Mark Figure 4. RH Bank Intake Camshaft Timing Gear 2 1 1 Bearing Cap Timing Mark 2 Gear Timing Mark © 2008 Toyota Motor Sales, USA T-SB-0291-08 September 11, 2008 Page 4 of 5 2GR-FE Valve Timing Procedure Inspection (Continued) Figure 5. LH Bank Intake Camshaft Timing Gear 1 2 1 Bearing Cap Timing Mark 2 Gear Timing Mark Figure 6. LH Bank Exhaust Camshaft Timing Gear 1 2 1 Bearing Cap Timing Mark 2 Gear Timing Mark HINT If the timing marks appear vastly out of alignment, turn the crankshaft one revolution (360 ) clockwise and note the position of the timing marks. Component Removal Guidelines 1. If engine disassembly is required that involves removing the camshafts or timing gears, set the #1 cylinder to TDC compression, wipe away any oil, and mark the following items in relation to each other prior to disassembly: • Timing gears • Timing chain • Timing chain No. 2 NOTE This relationship MUST be maintained. The intake gear is timed in relation to the crankshaft via the timing chain; the exhaust gear is timed in relation to the intake gear via the No. 2 timing chain. © 2008 Toyota Motor Sales, USA T-SB-0291-08 September 11, 2008 Page 5 of 5 2GR-FE Valve Timing Procedure Component Removal Guidelines (Continued) 2. If NEW camshaft timing gears or the No. 2 timing chain are being installed, the two yellow links on the No. 2 timing chain can be used to ensure correct relationship between the intake timing gear and the exhaust timing gear. Figure 7. 1 1 Yellow Link A. Align the paint mark on the timing chain with the intake gear timing mark (to ensure the intake gear is correctly timed to the crankshaft). Figure 8. RH Bank and LH Bank 3 3 4 3 3 4 5 4 5 4 1 2 1 RH Bank 2 LH Bank 3 Yellow Link 4 Gear Timing Mark 5 Timing Chain Paint Mark B. Align the two yellow links on the No. 2 timing chain to the timing marks on

You need a "timing light" to set your timing.

May be its problem with timing chain and it has to be inspected and replaced.Or its possible that timing chain is got misaligned.

There are few help,links provided related to timing chain assembly and dis-assembly. Go through it and confirm proper inspecting of timing chain.

Click the required help link below:----How to Replace Timing Chain Cover & Seal on Audi A4 ? http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-timing-chain-cover-seal.html
----------1982 Toyota Pickup: Set ignition timing, engine overheating, timing chain issue, dist off? http://whatisbyme.blogspot.in/2012/05/1982-toyota-pickup-set-ignition.html
----------How to Remove Timing Chain Cover and Seal on Toyota Previa?

http://technoanswers.blogspot.com/2011/12/how-to-remove-timing-chain-cover-and.html

--------

How to Remove Timing Chain and Gears on Toyota Previa?

http://technoanswers.blogspot.com/2011/12/how-to-remove-timing-chain-and-gears-on.html

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Ford Mondeo ST220 camshaft Timing specifications? http://technoanswers.blogspot.in/2012/02/ford-mondeo-st220-camshaft-timing.html
------------Replacing Timing Chain Cover For 2009 Ford?

http://repairhelpcenter.blogspot.in/2012/03/replacing-timing-chain-cover-ford-2009.html

-----------
Timing Chains & Front Cover Removal on 2008 Ford Taurus? http://repairhelpcenter.blogspot.in/2012/03/timing-chains-front-cover-removal-on.html
----------How to Replace Timing Chain Cover, Chain, Sprockets, & Seal On Ford Taurus? http://repairhelpcenter.blogspot.in/2012/03/how-to-replace-timing-chain-cover-chain.html
---------How to Replace Timing Chain & Sprockets on Ford Windstar? http://repairhelpcenter.blogspot.in/2012/03/how-to-replace-timing-chain-sprockets.html
---------Timing Chain & Sprockets Replacing on Ford, Mercury and Lincoln? http://fordrepairhelp.blogspot.in/2012/03/timing-chain-sprockets-replacing-on.html
----------How to Replace Timing Chain & Sprockets on Ford Edge and Lincoln MKX? http://howtobyme.blogspot.in/2012/03/how-to-replace-timing-chain-sprockets.html
------How To Replace Timing Chain, Sprockets & Front Cover on Ford Expedition and Lincoln Navigator? http://repairhelpcenter.blogspot.in/2012/03/how-to-replace-timing-chain-sprockets_356.html
---------Timing Chain, Sprockets, Front Cover & Seal removal for Ford Mustang? http://schematicsdiagram.blogspot.in/2012/03/timing-chain-sprockets-front-cover-seal.html
---------How to Replace Timing Chain on Buick LaCrosse? http://howtobyme.blogspot.in/2012/03/how-to-replace-timing-chain-on-buick.html
---------These details will help.For more help keep updated.Thanks.

For adjusting the ignition timing, you need a timing light.
Attach the spark lead from the timing light to the number one spark plug.
If the timing light is a powered type then
Attach the power leads of the timing light to the battery - red lead to the + terminal on the battery and the black lead to the - terminal on the battery.

Loosen the distributor so you can adjust the timing, start the engine and press the timing light trigger and aim the timing light on the timing marks on the crankshaft pulley. Adjust the distributor to the recommended timing mark for your engine.
Turn off the engine, remove the timing gun and tighten the lock on the distributor.

1. Remove the timing belt.
   

   Crankshaft and camshaft timing marks-2.4L engine
   

   Timing belt tensioner-2.4L engine
   

   Camshaft sprocket alignment-2.4L engine
   

   Timing belt installation-2.4L engine
   

   Timing belt tension adjustment-2.4L engine
   

   Timing belt tension verification-2.4L engine
   
   

1998-2003 To Remove:

1. Remove or disconnect the following:
   • Crankshaft pulley and hub
   • Drive belt tensioner
     
     
   • Timing chain cover bolts
     
     
   • Timing chain cover and gasket
2. Install a bolt in the end of the crankshaft CAUTION
   Do not install the crankshaft balancer bolt or a bolt longer than 1 inch or damage to the crankshaft threaded hole will result.
   
3. Rotate crankshaft until the number 1 piston is at Top Dead Center of compression stroke.
4. Make sure that the alignment marks are aligned with the tabs on the timing chain tensioner.
   
   
5. Measure distance between hole in bracket and unworn surface of timing chain tensioner shoe. NOTE: If distance between the hole and unworn surface of timing chain tensioner is greater than 0.314 in (8 mm), replace tensioner, timing chain and sprockets.
   
6. Remove timing chain tensioner bolts.
7. Remove the timing chain, timing chain tensioner and camshaft sprocket at the same time.
8. Remove the crankshaft sprocket using special tool J 22888-20A or equivalent.
9. Remove crankshaft sprocket alignment key.

NOTE: If any camshaft components are being replaced to correct a noise problem, all camshaft drive components must be replaced.
To Install:

1. Install the crankshaft sprocket alignment key.
2. Install the crankshaft sprocket using special tool J 5590 or equivalent.
   
   
3. Compress the timing chain tensioner spring and insert a pin into the tensioner hole to retain the tensioner shoe.
4. Install timing chain and timing chain tensioner (do not tighten tension bolts).
5. Align the crankshaft and camshaft timing marks with the tab on the timing chain tensioner.
6. Tighten the timing chain tensioner bolts.
   • Torque to: 18 ft lbs (24 Nm)
7. Tighten the camshaft sprocket bolt.
   • Torque to: 96 ft lbs (130 Nm)
8. Remove pin from timing chain tensioner hole.
9. Remove bolt from end of crankshaft. CAUTION
   Inspect the timing chain cover for warping or damage. Replace if needed.
   
10. Clean all timing chain cover mating surfaces.
11. Install or connect the following:
    • Timing chain cover to the engine block
      1. Ensure that the gasket is installed properly in the groove in the timing chain cover
    • Timing chain cover and make sure it fully seated on the alignment dowel pins
    • Timing chain cover bolts
      1. Torque to: 97 inch lbs (11 Nm)
    • Drive belt tensioner
    • Crankshaft damper hub and the crankshaft pulley

　
　
Timing Belt
REMOVAL & INSTALLATION
1.8L Engine
Disconnect the negative battery cable.
Remove the timing belt covers.
Rotate the crankshaft and align the timing marks located on the camshaft pulleys and the seal plate.
Remove the crankshaft pulley and hub.
If the timing belt is to be reused, mark an arrow on the belt to indicate its rotational direction to enable correct re-installation.
Loosen the timing belt tensioner lockbolt and remove the timing belt.
To install:
Temporarily secure the timing belt tensioner in the far left position with the spring fully extended, then tighten the lockbolt.
Make sure the timing marks on the timing belt pulley (crankshaft sprocket) and the engine block (oil pump housing) are aligned.
Make sure the timing marks on the camshaft pulleys and the seal plate are aligned.
Install the timing belt.
Loosen the tensioner lockbolt. Using a suitable prying tool, position the timing belt tensioner so the timing belt is taut, then tighten the tensioner lockbolt.
Turn the crankshaft two turns clockwise and align the timing belt pulley mark with the mark on the engine block.
Fig. 1: Timing marks are located on the camshaft pulleys as shown — 1.8L engines


　
Fig. 2: Make sure that the crankshaft sprocket (timing belt pulley) and oil pump timing marks are aligned — 1.8L engines


　
Fig. 3: Align the timing belt pulley mark with the tension set mark, at approximately the 10 o'clock position — 1.8L engines


　
Fig. 4: Check the timing belt deflection at the location shown — 1.8L engines

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SPECIAL TOOLS REQUIRED (or equivalents)

• J-36008, Camshaft sprocket timing alignment pins.
• J-39579, Camshaft sprocket wrench.

CAUTIONS:

• The timing chain on the 1996 LD9 (VIN T) Twin Cam Engine is not to be replaced with the timing chain from any other model year. The timing sprockets are different on the Twin Cam Engine and the shape of the links matches the sprockets. Engine damage may result if the wrong timing chain is used.
• The timing chain and crankshaft sprocket MUST be marked so that they are reinstalled with the same side facing out at the time of reassembly.
• Failure to follow the removal and installation procedures could result in severe engine damage.

REMOVE OR DISCONNECT

1. Negative battery cable.
2. Front cover, refer to Timing Cover / Service and Repair .
3. Rotate crankshaft in clockwise direction until camshaft and crankshaft timing marks are aligned.
4. Timing chain guides.
5. Raise and support vehicle.
6. Ensure slack in timing chain is above tensioner assembly, then remove chain tensioner. The timing chain must be disengaged from grooves in tensioner shoe to permit removal of shoe. Position a suitable screwdriver under timing chain while pulling shoe outward. If difficulty is encountered in removing tensioner shoe, proceed as follows:

1. Lower vehicle, then while holding the intake camshaft sprocket with J-39579, remove sprocket bolt and washer.
2. Remove washer, then install bolt into camshaft by hand.
3. Position a suitable three jaw puller into intake camshaft sprocket relief holes and remove sprocket. CAUTION: Do NOT pry on camshaft sprocket as damage to sprocket or timing chain housing may result.

1. Tensioner assembly attaching bolts and tensioner assembly.
2. MARK CRANKSHAFT SPROCKET AND TIMING CHAIN outer surface for reassembly.
3. Timing chain.

INSTALL OR CONNECT

1. Intake camshaft sprocket onto camshaft with surface marked during removal showing.
2. Intake camshaft sprocket retaining bolt and washer, torque to 70 Nm (52 ft lbs) while holding the sprocket with J-39579 (if removed).
3. Timing pins, J-36008, through holes in camshaft sprockets into holes in timing chain housing to position camshafts for proper timing. If camshafts are out of position and must be rotated more that 1/8 turn to insert timing pins:

1. Crankshaft MUST be rotated 90°clockwise off of TDC in order to give the valves adequate clearance to open.
2. Once the camshafts are in position and the timing pins have been installed rotate crankshaft COUNTERCLOCKWISE to TDC. CAUTION: Do NOT rotate the crankshaft clockwise to TDC, valve or piston damage could occur.

1. Timing chain over exhaust camshaft sprocket, around idler sprocket and around crankshaft sprocket.
2. Set camshaft sprockets at timed position and install timing chain. Remove timing pin from intake camshaft. Using J-39579, rotate the intake camshaft sprocket counterclockwise until timing chain can be installed over sprocket. Release J-39579 after timing chain has been installed over sprocket. The length of chain between intake and exhaust camshaft sprockets should tighten. The timing pin should easily fit through intake camshaft sprocket timing hole into timing chain housing timing hole. If timing pin does not fully index, the camshafts are NOT timed correctly and the procedure MUST be repeated.
3. With timing pins installed, raise and support vehicle.
4. With slack removed from timing chain between intake camshaft sprocket and crankshaft sprocket, timing marks on crankshaft and engine block should be aligned. If the marks are not aligned, move timing chain one tooth forward or rearward to align marks. Remove slack and recheck marks.
5. Reload tensioner assembly to zero position as follows:

1. Form a keeper out of heavy gauge wire into a U-shaped piece with a half inch opening.
2. Apply slight force on tensioner blade to compress plunger.
3. Insert small screwdriver into reset access hole and pry rachet pawl away from ratchet teeth while forcing the plunger completely in the hole.
4. Install keeper between access hole and blade.

1. Tensioner assembly to chain housing and recheck plunger assembly installation, noting long end is toward crankshaft.
2. Tighten timing chain tensioner bolts to 10 Nm (89 in lbs) .
3. Lower vehicle to point where timing pins can be removed from camshaft sprockets.
4. Rotate crankshaft two revolutions in the clockwise direction. Align crankshaft keyway with the mark on cylinder block and reinstall timing pins through camshaft sprockets into housing timing holes. Timing pins should slide easily through timing holes. If timing pins cannot be inserted easily, repeat procedure to properly time engine. CAUTION: If the engine is not correctly timed, severe engine damage could occur.
5. Timing chain guides.
6. Engine front cover.
7. Negative battery cable.