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1997 ford explorer 4.0 sohc how to set timing

Where are the timing marks at on the camshafts and chain to set timing

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There are no timing marks. Timing is done using special tools to hold the crank at top center and a tool to hold each camshaft in position. the cam sprockets are not pinned to the cams. there are also dummy tensioners installed to take up the slack till the tightening is done. Also there are chains at the back of the motor that can only be timed with the motor out of vehical.

Posted on Feb 21, 2009

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Setting of timing chains


Get Ford timing tool kit, part = otc-6488 (For about $119 USD on eBay)

4 timing chains (3 front including the optional balance shaft chain + 1 back)

2 cam guides (1 front + 1 back)

2 oil tensioners (1 front + 1 back)

1 jackshaft tensioner (1 front)

1 jackshaft guide/cassette (1 front)

1 balance shaft tensioner (1 front) (will probably be ok, so dont replace it)

1 balance shaft guide (1 front) (will probably be ok, so dont replace it)

new sprockets + bolts + gaskets etc.

new spark plugs + throttle body cleaner + lithium grease spray + oil change

head gaskets


some of these parts (the front stuff) can be obtained as a primary timing chain rattle noise kit Part# = 2u3e-6d256-** ab for 4*4 & bb for 2*4.

The kits also have later part numbers for us$ 76 @ http://www.fordpartsonline.com


My parts order (without the balance shaft stuff) was:

$76.04 KIT-TENSIONER TIMING 2u3e-6d256-ab

$47.93 Engine, Camshaft and timing, Timing chain, TIMING CHAIN, Explorer, Mountaineer, Rear - 4.0L SOHC - 4.0L SOHC

$57.36 Engine, Camshaft and timing, Chain guide, CHAIN GUIDE, Explorer, Mountaineer, Jackshaft To Cam - 4.0L SOHC - 4.0L SOHC

$103.22 Engine, Overhaul gasket set, OVERHAUL GASKET SET, Explorer, Mountaineer, Upper (Valve Grind) - 4.0L SOHC - 4.0L SOHC

$28.93 Engine, Camshaft and timing, Tensioner, TENSIONER, Explorer, Mountaineer, Upper - 4.0L SOHC - 4.0L SOHC

Its worth mentioning that this procedure is not enjoyable at all and should be undertaken with at least 8 full days to completion (I recon you could do it in half the time the second time).

It is basically on entire engine re-build with both heads off and the engine out of the vehicle.

It is not possible to do the rear chain or sprocket with the engine in the car as the flywheel needs to come off + at least 1 head, but it is possible to do the front primary chain and or front cam chain with the engine in the car.

You will be a ford exploder and timing expert after you do this - the main reason should be the love of your American built vehicle. Its a solid car - except for the plastic guides!

Disclaimer Note: This is how i successfully did the job, but i am not a ford mechanic and don't hold me responsible if this does not work for you.
Timing Overview

A Small Sprocket on the crank turns a larger (2 to 1 ratio) jackshaft sprocket that is in turn connected front & back to the 2 camshafts.

Thus a 360o turn of the crank will turn both the camshafts 180o.

Firing order is 1-4 2-5 3-6, Right side numbers 1,2,3. Left Side = 4,5,6.

At TDC pistons 1 & 5 are fully raised, thus 1 is about to spark & 5 is evacuated.

The engine will turn freely (no piston to valve contact) with the cams 180o out, it will even run (roughly) with 1 out 180o, any other settings may cause major damage to the valves.

The 2 cam shafts come with timing markings, "yes" real timing marks that anyone can use (even without special tools) to ensure correct timing.

The way to time it is to ensure both the off centre cam shaft slits are level/flat with the head.

With the engine at TDC both the cams need to have the off centre slot in the same position either up and level or down and level.

It is super critical that both the camshafts are 100% in sink with each other, i.e. not a few degrees off, the engine computer can compensate for crank timing but not engineering failure.

Be warned the camshafts can turn easily fast & hard by themselves as a few springs are compressed at TDC, I got my finger jammed and its still healing + if the engine is not at TDC you may damage a valve.

Now heres the hard thing that you will need special tools for - if you need to change the timing, you will need to be able to undo the cam sprocket bolt on both cams & these are done up real tight.

There is a tool that you attach that has 2 pencil thick shafts that fit into the sprocket and prevent it from turning - then you need to put about 90Nm of force on the bolt (remember the rear one if LHT)

For the $money$, its well worth getting yourself the tool kit - it will save you hours in the long run. Search eBay for otc-6488 should be US $119 - then sell them again for say $100.

There is also a tool version of the oil tensioner in the kit that screws right in and puts the correct amount of force on the chain + guide, to enable you to do up the cam bolt with the chain and sprocket in the right spot on the cam.


Dec 20, 2010 | 2003 Ford Explorer

1 Answer

Timing belt is broken is a belt or chain


chain. R&R instructions from autozone.com pasted below. let me know if you have any more questions.


REMOVAL & INSTALLATION
SOHC Engine See Figures 1, 2, 3 and 4

  1. Disconnect the negative battery cable.
  2. Remove the timing chain front cover.

During timing chain and sprocket removal, position the crankshaft 90 degrees past Top Dead Center (TDC), to make sure the pistons will not contact the valves upon assembly.
  1. Carefully rotate the crankshaft clockwise so the timing mark on the crankshaft sprocket and keyway align with the main bearing cap split line (90 degrees past TDC).
  2. Remove bolts, then remove the timing guides and tensioner.
  3. Remove the camshaft sprocket bolt, using a 7 / 8 in. (21mm) wrench to hold the camshaft. Then remove the timing chain and camshaft sprocket. Remove the crankshaft sprocket, if necessary.

To install:
  1. Inspect the chain for wear and damage. Check the inside diameter of the chain, it should be no more than 16.77 in. (426mm). Inspect the chain guides for wear or cracks and the timing sprockets for teeth or key wear. Replace components as necessary.
  2. Verify that the crankshaft is positioned 90 degrees clockwise past TDC from the keyway (keyway at 3 o'clock).
  3. Bring the camshaft up to No. 1 TDC by loosely installing the sprocket and rotating the sprocket until the timing pin can be inserted. The camshaft contains wrench flats to assist in turning the shaft. The dowel pin should be at 12 o'clock when the camshaft is at TDC and a timing pin ( 3 / 16 in. drill bit) should then install at about the 8 o'clock position.
  4. If removed, install the crankshaft sprocket, then rotate the crankshaft counterclockwise 90 degrees up to No. 1 TDC (keyway at 12 o'clock).
  5. Position the chain under the crankshaft sprocket and over the camshaft sprocket. If necessary remove the camshaft sprocket, then slide the camshaft sprocket into position with the chain already engaged. The timing chain should be positioned so that one silver link plate aligns with the reference mark on the camshaft sprocket and the other aligns with the downward tooth (at the 6 o'clock position) on the crankshaft sprocket. The letters FRT on the camshaft sprocket must face forward, away from the cylinder head and excess chain slack should be located on the tensioner side of the block.
  6. Temporarily install the timing pin to verify proper alignment of the camshaft and sprocket, then install and tighten the sprocket bolt to 75 ft. lbs. (102 Nm). Again, use a wrench on the camshaft flats to hold the shaft in position while tightening the bolt. Do not allow the camshaft retaining bolt to torque against the timing pin or cylinder head damage will result.
  7. Install the chain guides with the words FRONT facing out. Install the fixed guide first and verify the chain is snug against the guide, then install the pivot guide. Tighten the bolts to 19 ft. lbs. (26 Nm) and verify that the pivot guide moves freely.
  8. Retract the tensioner plunger and pin the ratchet lever using a 1 / 8 in. No. 31 drill bit inserted in the alignment hole at the bottom front of the component. Install the tensioner and tighten the bolts to 14 ft. lbs. (19 Nm), then remove the drill bit.
  9. Make one final check to verify all components are properly timed, then remove all timing pins.
  10. Install the timing chain front cover.
  11. Connect the negative battery cable, start the engine and check for leaks.

jturcotte_7.gif

Fig. Fig. 1: At 90 degrees past TDC, the crankshaft sprocket timing mark and keyway will align with the main bearing cap split line



jturcotte_8.gif


Fig. Fig. 2: Exploded view of the timing chain and sprocket assembly-SOHC engine


jturcotte_9.gif

Fig. Fig. 3: Insert the timing pin to ensure that the camshaft is at No. 1 TDC-SOHC engine



jturcotte_10.gif

Fig. Fig. 4: When the camshaft is at TDC, rotate the crankshaft counterclockwise 90 degrees to achieve TDC

Nov 02, 2010 | 1997 Saturn SL

1 Answer

2000 ford explorer sport 4x4 timing timing chain rattling. have heard that changing to a synthetic 5w30 oil with wix filter will quieten it down. any feedback or experience on this ? It is the 4.0 sohc...


A change of oil may help, but problem likely due to a combination of stretched timing chain and worn anti rattle chain tensioner.
If noise persists, a new chain and checks to tensioner would be worthwhile.

Jan 22, 2010 | 1997 Ford Explorer AWD

1 Answer

1997 Explorer - 4.0 SOHC v6 engine knocking noise


yes I would due engine. heck for $2,200 dollars I could do the job parts labor and all

Dec 27, 2009 | 1997 Ford Explorer AWD

1 Answer

2000 ford 4.0 sohc how to set feront timing chains chain stops broke off now cannot reset no timing marks


you kinda destroyed it. you need specialty tools, a good manual, and new parts. You don't do this right the first time, you bend valves, period.

Oct 27, 2009 | 2000 Ford Explorer

3 Answers

Timing belt


Absolutely NOT TRUE this vehicle has a timing chain, NOT a timing belt. It has a serpentine belt. Thanks for using FIX YA

May 16, 2009 | 2000 Ford Explorer

1 Answer

2001 Ford Explorer 4.0 SOHC no timing marks on cam or chain


get a haynes manual and look up camshaft replacement..its worth the 30 bucks

May 04, 2009 | 2001 Ford Explorer Sport

1 Answer

1997 Ford Explorer SOHC. timing chains


The front of the motor has to be removed to access the chains and guides [which may have broken] This can be done without removing the engine, but there are special tools needed to set the chain timing and also for removal of the crank dampner. It is not an easy task.

Feb 20, 2009 | 1997 Ford Explorer AWD

1 Answer

Help


I will assume you are referring to the timing procedure for a replacement timing belt (4 cyl) or timing chain (V6) With the V6 timing chain you simply line up the timing marks on the two sprockets so that they are pointing directly toward each other, crankshaft sprocket with the mark pointing straight up, camshaft mark straight down. With the 2.3 L 4 cylinder engine, you must first position the crankshaft at TDC, and then position the oil pump and camshaft sprockets with their timing marks to line up with their respective marks on the inner cover. Install the belt and release the spring tensioner to let it adjust itself, tighten the tensioner bolt, and turn the engine over for 2 rotations (always clockwise as viewed from the front, never backwards). Make sure the marks still line up, loosen the tensioner, allow it to retension itself, and tighten the tensioner bolt. If the oil pump sprocket is not timed correctly, the camshaft position sensor signal will be incorrectly timed.

Aug 01, 2008 | 1997 Ford Ranger SuperCab

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