Question about 1994 Isuzu Pickup

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Timing belt needs changed

My 1994 Isuzu pickup requires the timing belt to be changed, I've bought the belt and am ready to tear into the engine and fix it, but i dont' have any information on how the timing belt is suppose to go in or to what degree it needs to be timed.....

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If I had engine number I could supply details,this is the eng model number that is usually on a tag the size of cig pkt,situated in the firewall or inside of bonnet,others are on door pillar. Failing that strip down to the cambelt,see if you can identify marks on cam,crank sprockets and corresponding marks that they align to on block and's good to paint mark the old belt to those marks so you can transfer those to the new belt,it will make timing easier as you have 2 self checks measures. nb:most belts have engine rotation direction printed on it. make sure that idler,tensioner pulleys arent noisey, if model has a silicone tensioner,these are more difficult to set if tensioner pulley swivels to to give more precise info i will really need engine spec/model no. IMPORTANT:when belt on,timed and tensioned,turn over in direction of engine crank 2 complete revolutions of crank pulley-that is 4 rotations of cam(s).all marks should be aligned(sprockets and marks)not always paint marks on belt though.if not aligned patience needed more than bent valves.

Posted on Aug 31, 2009


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1 Answer

What cylinder is used to reset distributor on 1994 Isuzu p.u. 2.3 engine

Unlike French cars which tend to use number four cylinder as the timing cylinder, almost everyone else including Isuzu use the traditional number one as the timing cylinder, not that for practical purposes it matters very much as it is a simple matter to discover which cylinder is at the top of the compression stroke and then fit the distributor with the rotor pointing at the distributor cap segment for that cylinder.

It is the direction of distributor rotation that confuses people more than anything as many rotate anti-clockwise although I believe the one you are working with rotates clockwise. Another problem with many traditional distributor installations is they often share the oil pump drive which must both be aligned before the distributor will successfully slide home and then because of the skew-type drive gear the distributor turns considerably on the way in and then the rotor is found to be misaligned. The apprentice mechanic soon learns to anticipate and allow for these things.

If the same distributor is being refitted it is best to make alignment marks to cut the amount of time and effort. Few engines require the removal of the distributor for routine timing belt replacement and usually all that is needed is an ignition timing check with a stroboscope.

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1 Answer

Which cylinder is used to reset distributor for 1994 Isuzu p.u. 2.3 engine

must be 4ZD1 engine with carb?
ok, so why tell the full story or job so we can be on same page.
1: distributor pulled.
2: or just messed up timing,
3: or just scrambled the wires? on top of cap to plugs?
4: all 3?
need to know rotor direction, crank it to see.
need to know where #1 is, its front front.
need to set the distrib. so that #1 rotor location is at #1 wire, and crank is at $1 firing and that both #1 valves are closed.

number 1 TDC on all engines, is the timing spec.

now you ask where is #1 right>?

#1; is the most forward cylinder , in inline and V engines.
forward means, the CAM driven end.

it's not reset , its calibrated, using a timing light with
the the timing freeze jumper inserted.(EFI)

if removed. the distrb. worse case.
there is static timing steps
and then dynamic (fine tuned ) with the timing light.

in general all 4 bankers. with dizzy
1: set crank to #1 firing both #1 valves closed
and lash loose. if lash is wrong, get that right first. Clearance is 0.006 in. (0.15mm) for intake and 0.010 (0.25mm) for exhaust.

2: next insert the distributor so such that
the 4 HV lugs are up and that the rotor points to the correct inside cap terminal, #1.
use a ohm meter to find #1 cap terminal if that was lost too?.
3: lock down the distributor, it is now crudely time to #1 firing
4: use the Timing light now to set timing.
is different on EFI from CARB.
you never said if its either. has this.
but you need to go to correct section, carb or EFI.
and read there.

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Line Up the Gears.

Click on the following free direct Link. It has the Timing: Belt and Mark Diagrams for your 1994 Isuzu Pickup. Plus additional Instructional and Directional Diagrams.

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at!

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