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-   -   4.0L HO i6 engine swap problems "PLEASE HELP" (https://www.jeepscanada.com/jeep-yj-forum-21/4-0l-ho-i6-engine-swap-problems-please-help-124853/)

marihards 04-30-2013 12:41 AM

4.0L HO i6 engine swap problems "PLEASE HELP"
 
I had to swap motors so i could rebuild the original motor that had ring and valve issues... I drive a 92 yj and the donor was a 93 xy. both motors are 4.0L HO i6 and both were auto transmissions. I did the swap and now the donor motor wont fire:thumbdown:, just cranks over. I have spark and fuel my compression is around 150 all across. I've flipped the distributor 180 and no better... when I first put the donor in it would start and imediatley die but now it just cranks...
Need some advise as I am stumped :confused:

oldfart 04-30-2013 07:49 AM

Re: 4.0L HO i6 engine swap problems "PLEASE HELP"
 
You say you have fuel? do you mean you have fuel pressure or are you sure the injectors are firing. If you have a stethoscope you should be able to hear the injectors clicking (screwdriver held to your ear might also work).

salad 05-03-2013 10:30 PM

Re: 4.0L HO i6 engine swap problems "PLEASE HELP"
 
Courtesy of a friend of mine:


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.

Remove the distributor cap and cut a "window" into the side of the distributor cap at the #1 spark plug wire post . The "window" should be large enough to allow easy visual inspection of the position of the distributor rotor at the #1 spark plug wire post. Reinstall the distributor cap.

Install a ¾" wrench or socket onto the vibration damper retaining bolt. Rotate the engine in a clockwise direction until the #1 cylinder is at top dead center. Align the timing mark on the vibration damper with the "0" degree mark on the front cover timing scale. The tip of the distributor rotor should be near the #1 spark plug wire post.

Disconnect the distributor electrical connection. Remove the distributor holddown clamp, holddown bolt and distributor. Remove the distributor cap and rotor.

Place the distributor housing upside down in a soft jaw vise. Scribe a line 1/2 inch from the end of the distributor locating tab. Cut the distributor locating tab at the scribed line with a saw.

Remove any burrs and metal filings from the distributor. Reinstall rotor.

If necessary, using a flat blade screwdriver, turn the oil pump gear drive shaft until the slot is slightly past the 11 o'clock position. The oil pump gear drive shaft is accessible through the distributor mounting bore in the engine block.

Visually align the modified locating tab area of the distributor housing with the holddown clamp bolt hole.

Turn the rotor to the 4 o'clock position.
Lower the distributor into the engine block until it seats. The rotor should now be very close to the 5 o'clock position.

Reinstall the distributor cap with the cutout "window". Rotate the distributor housing until the trailing edge of the distributor rotor tip is just departing from the #1 spark plug wire post terminal .


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