Engine Rebuild/Swap Options? (94 Explorer)
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Engine Rebuild/Swap Options? (94 Explorer)
Hello,
Some of you may recognize me from my previous adventure (see thread "94 Explorer Won't Start").
I have the heads off the motor (motor in place). Number 6 piston has a 3/4 inch long crescent moon shaped piece missing out of one side (not good). Number 6 had zero compression before I removed the head (the other 5 were OK). Heads, valves, rods lifters look OK for major structure. No major (obvious) damage to the cylinder.
The short block is still in the chasis. I have to remove the block from the 94 even if I swap (I have a 1991 4.0L motor in the Explorer I drive). I'm in no rush to get the 94 on the road (project truck). I plan to work ALL of the 94 (front end, exhaust, body, paint etc) so I want a motor to go 5 years minimum.
Which way to procede? Pull the 94 and rebuild? Slip the 91 into the 94 (91 has 210K miles, 94 had 170K miles but was "rebuilt" 12 months ago according to previous owner). Buy a crated short block or long block. Find a good used 4.0 with lower milage?
I have never done anything beyond the heads before but I don't mind learning as long as the expense makes sense (crank, bearings, cylinders, heads done etc).
Any suggestions??
Gil
Some of you may recognize me from my previous adventure (see thread "94 Explorer Won't Start").
I have the heads off the motor (motor in place). Number 6 piston has a 3/4 inch long crescent moon shaped piece missing out of one side (not good). Number 6 had zero compression before I removed the head (the other 5 were OK). Heads, valves, rods lifters look OK for major structure. No major (obvious) damage to the cylinder.
The short block is still in the chasis. I have to remove the block from the 94 even if I swap (I have a 1991 4.0L motor in the Explorer I drive). I'm in no rush to get the 94 on the road (project truck). I plan to work ALL of the 94 (front end, exhaust, body, paint etc) so I want a motor to go 5 years minimum.
Which way to procede? Pull the 94 and rebuild? Slip the 91 into the 94 (91 has 210K miles, 94 had 170K miles but was "rebuilt" 12 months ago according to previous owner). Buy a crated short block or long block. Find a good used 4.0 with lower milage?
I have never done anything beyond the heads before but I don't mind learning as long as the expense makes sense (crank, bearings, cylinders, heads done etc).
Any suggestions??
Gil
