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Re: setting distributor jeep wrangler 1997 4L
I'm going to assume that you have some idea where the rotor was pointing before you took unit out. Turn the crankshaft by hand 'till you find the small notch on the back edge of the pulley. Mark the notch with white crayon. Turn the crank untill the mark you made lines up with "0" on the scale on the right side (facing engine) at about 2 oclock. (sometimes needs to be cleaned off to read it) You are now either dead on or 180degrees out of phase. (rotor will be pointing directly away from where you think it should be if it is 180 out). If close to original location, make a mark on outside of dist housing, directly below #1 ign wire post. Remove cap and check that rotor is aligned with the mark you made. If it is not, remove distributor part way, till you can feel the drive gear just disengage, then turn rotor towards the reference position. Once positioned, push distributor housing back down into block. If it does not drop down fully, have someone turn the crank by hand two full turns back to reference mark while you push gently down on distributor. when the oil pump shaft engages, dist will drop down. If you found dist to be 180 out, remove it and turn rotor to proper position, then follow instructions above. The timing is non adjustable on these engines.(timing is changed by computer) There is a single bolthole in the dist retaining ear (part of dist housing) When checking reference points, always keep this hole lined up with bolt hole in block. Before attempting to start engine, make sure that after everything is bolted down, your reference marks match! There are several other ways to do this. This is the most simple and safest way. as at no time is the ignition key in the "on" position, while making these adjustments.. Turning the engine with the key "on", even by hand, & even with the timing out of phase can result in "kickback" which can and usually does hurt someone.
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Check this on 1987 Jeep Wrangler 4.2 liter L6 VIN "C" 2-bbl
Ignition timing is a measurement, in degrees of crankshaft rotation,
of the point at which each cylinder's spark plug fires. It is normally
listed as a specification in degrees before or after Top Dead Center
(TDC) of the compression stroke.
On the 4.2L engine, the timing
can be adjusted by turning the distributor in the engine. A graduated
timing degree scale located on the timing case cover is used for
reference when timing the ignition system. A milled index notch in the
vibration damper is used to align the No. 1 cylinder ignition position
of the crankshaft with the correct timing degree mark on the graduated
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1. Set parking brake. Shift automatic transmission to Park or manual transmission to Neutral. With A/C off, start engine and attain normal operating temperature.
2. With ignition OFF, connect an ignition timing light and a calibrated, expanded-scale tachometer.
3. Disconnect 4 " and 10 " Hg (CEC System) vacuum switch assembly wire connector (located at top of valve cover). Disconnect and plug distributor vacuum advance hose.
4. Start engine, increase engine speed to 1600 RPM and check ignition timing. Adjust timing to specification listed on Emission Control Information label (if necessary). Tighten distributor hold-down clamp and recheck ignition timing.
5. Turn engine off and remove timing light and tachometer. Connect No. 1 spark plug lead, if disconnected. Unplug and connect distributor vacuum advance hose. Connect vacuum switch assembly wire connector.
NOTE: If timing light has an adjustable advance control feature, turn control to OFF position.
Since both engines have the identical timing setup it likely will not matter which year the engine was made. If engine came with the vehicle it may have been produced late in 94 and will carry a 95 date (production date is on sticker on door) Your distributor is "locked" and timing cannot be set except that it needs to be placed in the proper position when being installed. (pointing to the #1 wire tower on the cap with the timing mark on crank pulley at tdc. Running timing changes are made by the computer using info from the crank sensor, throttle position sensor, map sensor and cam sensor (inside the distributor housing)
2.5L Engine 1987-90 VEHICLES See Figures 1, 2, 3 and 4
Fig. 1: Exploded view of the distributor-1987-90 2.5L engine
Fig. 2: Positioning the oil pump shaft for distributor installation-1987-90 2.5L engine
Fig. 3: Positioning the distributor rotor and shaft for installation-1987-90 2.5L engine
Fig. 4: Rotor position with the distributor properly installed-1987-90 2.5L engine
Disconnect the negative battery cable.
Remove the primary lead from the terminal post at the side of the distributor.
The wire connector will contain a special conductive grease. Do not
remove it. The same grease will also be found on the metal parts of the
Disconnect the vacuum line if there is one.
Remove the two distributor cap retaining hooks or screws and remove the distributor cap.
Note the position of the rotor in relation to the base. Scribe a
mark on the base of the distributor and on the engine block to
facilitate reinstallation. Align the marks with the direction the metal
tip of the rotor is pointing.
Remove the bolt that holds the distributor to the engine.
Lift the distributor assembly from the engine.
To install, if engine was not disturbed:
Insert the distributor shaft and assembly into the engine. Line
up the mark on the distributor and the one on the engine with the metal
tip of the rotor. Make sure that the vacuum advance diaphragm is
pointed in the same direction as it was pointed originally. This will
be done automatically if the marks on the engine and the distributor
are line up with the rotor.
Install the distributor hold-down bolt and clamp. Leave the screw
loose enough so that you can move the distributor with heavy hand
Connect the primary wire to the distributor side of the coil.
Install the distributor cap on the distributor housing. Secure the
distributor cap with the spring clips or the screw type retainers,
whichever is used.
Install the spark plug wires. Make sure that the wires are
pressed all of the way into the top of the distributor cap and firmly
onto the spark plugs.
If the engine was turned while the distributor was removed, or
if the marks were not drawn, it will be necessary to initially time the
engine. Follow the procedure below. To install, if engine was disturbed:
Rotate the engine until the No.1 piston is at TDC compression.
Using a flat bladed screwdriver, in the distributor hole, rotate
the oil pump gear so that the slot in the oil pump shaft is slightly
past the 3:00 o'clock position, relative to the length of the engine
With the distributor cap removed, install the distributor with
the rotor at the 5:00 o'clock position, relative to the oil pump gear
shaft slot. When the distributor is completely in place, the rotor
should be at the 6:00 o'clock position. If not, remove the distributor
and perform the entire procedure again.
Tighten the lockbolt.
Remember rated this post; I hope help you with this.
You can do either one of two things. Leave the distributor where it is and clamp it down. Or set it up to TDC, mark the dist cap #1 on the housing, lift the distributor and turn the rotor so when it sets back in, the trailing edge (right side) of the rotor is on the left side of your mark. That is how it is base timed. I hope this helps.
wall5552: there were two engines used in 1992 Jeep Wranglers.
A 2.5 liter and a 4.0 liter. HOWEVER>>>> The location for the crank angle sensor is the same for both.
It is located on the bell housing up near the front at about the 10:00 PM position.
The Cam position sensor is located in the Distributor on both engines as well.