90 xj head swap issue
01-29-2013, 05:00 AM
#31
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Get the 8 digit number off the driver's side block before proceeding.
01-29-2013, 06:40 AM
#33
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
01-30-2013, 05:37 AM
#37
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Do this to both engines to start with.
Setting Your 4.0 at #1 TDC
With #1 spark plug removed, turn the engine over clockwise using the 3/4" front crankshaft bolt. You will see the degree marks on your front cover. You will see the timing mark on the balancer. Mark them with chalk or white-out. While turning the engine over, put your finger/thumb over #1 spark plug hole. As the mark on the balancer approaches the marks on the front cover, if you are coming up on #1 TDC, pressure in the cylinder will push on your finger. If there's no pressure, you're at #6 TDC and need to crank the engine over until you see the marks coming together and you get pressure. Set the mark on the balancer to the 0 mark on the front cover.
#1 is denoted by the yellow connector in the photo. Firing order is clockwise 1-5-3-6-2-4
Setting Your 4.0 at #1 TDC
With #1 spark plug removed, turn the engine over clockwise using the 3/4" front crankshaft bolt. You will see the degree marks on your front cover. You will see the timing mark on the balancer. Mark them with chalk or white-out. While turning the engine over, put your finger/thumb over #1 spark plug hole. As the mark on the balancer approaches the marks on the front cover, if you are coming up on #1 TDC, pressure in the cylinder will push on your finger. If there's no pressure, you're at #6 TDC and need to crank the engine over until you see the marks coming together and you get pressure. Set the mark on the balancer to the 0 mark on the front cover.
#1 is denoted by the yellow connector in the photo. Firing order is clockwise 1-5-3-6-2-4
01-30-2013, 01:52 PM
#39
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Year: 88
Model: Cherokee
Engine: i6 4.0
01-30-2013, 06:08 PM
#41
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Year: 1990
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Is there a distributor in the "new" engine? If so, bring it around to the same positon.
01-30-2013, 06:37 PM
#42
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01-30-2013, 06:50 PM
#43
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Well, you can be on #1 or #6. Only way to tell you're on #1 is to use the instructions I posted.
01-30-2013, 09:40 PM
#44
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ok i turned crank until it stopped blowing my finger out the number 1 hole have the harmonic balancer on 0. so i take it i followed the instructions
Last edited by anothadayridin; 01-30-2013 at 10:45 PM.
01-30-2013, 10:07 PM
#45
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Year: 1990
Model: Cherokee (XJ)
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Yep. You did. Drop the dizzy in so the rotor is just past the #1 terminal on the dizzy cap.