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REPLACING a 4.0 sohc &trans

wshful

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October 20, 2008
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City, State
central nj
Year, Model & Trim Level
1998 explorer
Guys I need to know the progression of steps to replacing a 4.0 sohc and trans.in my 4x4 '98 sport, specifically what to take of and what to leave on. I haven't pulled an engine since the '70s and I don't want to mess anything up. Any advice would be greatly appreciated. Thanks
 



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I'm planning on replacing my engine and trans this weekend. I'll let you know how it goes. Not sure I'll have time for a full write-up with pics and stuff, but I can list the basics. I'm doing most of this by myself, with my dad helping put the trans back in. I've installed the trans myself twice, and decided its easier with two people. I haven't pulled an engine from an Explorer yet, so it'll be a challenge. I'm used to Mustangs that are nice and low with everything easy to reach. Hopefully my engine hoist can lift high enough to get everything over the rad support.

The engine is being replaced with a low mileage one. It was cheaper and easier than rebuilding the old one. The trans needs a couple more internal parts replaced, so I figured I might as well pull it too while the engine is out.
 






Get a repair manual (Chiltons or Haynes) and be done with it -- they go through the process step by step. Just allot about twice the time as you'd expect because, as any program manager will tell you, projects always overrun schedule and budget.
 






Silver X ,I'd appreciate that, thanks.
 






Looks like mine will have to wait til next weekend to get started.:(

I have to work all day this Saturday, and now my wife wants (me) to carpet the basement stairs on Sunday. It sucks, because I really want to get this engine done before it gets too cold outside. My garage isn't heated....
 






http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528018ec84 thats a link to removing the engine. autozone has free online guides for a lot of cars if you dont want to drop money on the haynes/chilton manual.

i've only ever pulled the engine on my explorer (98 SOHC 2WD) and coming out, it didnt put up much of a fight. i did have some trouble getting the torque converter lined back up, but didnt lose too much time. id say it took me about a days worth of work to remove and reinstall, but that is only an estimation. When i did it, i had access to a 2 post service lift, but i was also working on other vehicles at the time. and the truck also sat for a week while i waited on parts to rebuild the engine (i didnt do a complete rebuild, i had a HG leak and broken timing chain guides, but i pretty much removed everything except crank, rods and pistons.)

id say, if you were only working on that the whole weekend, it should be no problem to pull the engine and trans and drop it back in as long as nothing major goes wrong and you need parts or something. Protip, you dont need to disconnect the A/C compressor lines to pull the engine. just unbolt the compressor and move it to the side. same goes for the power steering. furthermore, if you plan on moving the truck around with the powersteering pump off, make sure you hang the pump/reservoir upright so that you dont trap air in the system like i did (i think i may have ruined my steering rack because of it)
 






I have the engine and trans out. The old engine stuff is swapped over to the new engine (from '05 Ranger 4x4). Almost ready to go back in.

Ran into a few problems along the way. My motor mounts were too rusty to remove from the truck. I had to unbolt them from the engine instead. This left the motor mounts in the way, blocking me from removing the trans out the front with the engine. I also broke or damaged a few bolts and studs and still need to replace them.

My truck sits high enough that I didn't need to use a floor jack for anything except to get the trans out from under the truck. Trans wouldn't fit under the frame rail while sitting on the trans jack.



My procedure so far:

**don't forget to bag and tag all fasteners. Also tag vacuum lines and electrical connectors before removing. Taking detailed photos will help too.**

1) drained radiator, engine oil, transmission fluid, and transfer case fluid.
2) disconnect battery cables. (remove battery if you want extra room)
2) Unpluged o2 sensors and removed exhaust y-pipe and cat-pipe.
3) removed front driveshaft completely.
4) disconnected rear driveshaft from transfer case. Left attached to rear diff.
5) removed transfer case.
6) removed starter.
7) removed fan, shroud, and radiator.
8) removed accessory belt.
9) disconnected A/C and P/S from bracket, and tied each off to the side. (Remove front tire to access A/C fasteners through wheel well)
10) removed A/C bracket from engine. (may not need to, but I wanted the extra room since I couldn't remove battery)
11) disconnected the wiring from the computer at cowl.
12) disconnected the wiring from the block on the driver side of engine.
13) disconnected the rest of the wiring and vacuum lines that went from body to engine.
14) disconnected shift cable, trans cooler lines (unbolted bracket from engine too), and wiring from trans, then secured out of the way. Also removed trans dipstick tube.
15) removed torque convertor nuts.
16) put trans jack under trans and strapped it down.
17) unbolted trans crossmember from frame then removed from trans too.
18) lowered trans a couple of inches, then removed all bolts that hold trans to engine.
19) pulled trans from engine, the lowered trans jack all the way.
20) lifted rear of truck enough to remove trans from underneath, then set it back down.
21) stopped for dinner, but didn't feel like going back out afterward.

22) removed hood from truck...had to get a helper for that.
22) hooked up engine crane to engine.
23) unbolted mounts from engine.
24) pulled engine forward and up, then out.
25) removed intake, engine wiring, vac lines, fuel lines and injectors from old engine and new engine.
26) stopped again for the day.

27) installed all the appropriate parts onto the new engine. The harness on the new engine was slightly different (and cut), so had to use my old stuff. Injectors and fuel rail are different too, so used my old stuff. Intake was very similar, so I used the new one. EGR same, so left alone. Some vac lines are different, so I mixed and matched....need to make an adapter for one set to attach to new intake.
28) This is where I stopped for today.

Have to remove the motor mounts from the truck before going any farther. Will probably try them tomorrow if I don't have to work too late. Still have to fix the trans too. I'd like to bolt up the trans to the engine and try to stuff them both through the front.
 






Been extremely busy at work lately, so haven't had much time to catch up on things at home. Finally rebuilt my trans this week. Replaced everything inside it. I put the engine back in yesterday. Installed the trans after work today. Was going to try to drop them in bolted together, but wasn't sure how it would go. Didn't have time to screw around. The engine by itself dropped right in REALLY easily. Bolting the accessories and wiring back up wasn't bad except the P/S pump. It was a little PITA, since I didn't remove the pulley. Stupid thing wouldn't go back into the bracket. Removed the pulley and it went right together. Try to skip a step or two and it ends up taking longer. :rolleyes:

Still have the transfer case and exhaust left to bolt up. Hopefully finish tomorrow or Friday, depending on if I have OT tomorrow.

This whole thing has been alot more difficult than planned, mostly because I waited so late in the year. Temp has been in the high 20s/low30s everyday I've been out there. I really need a garage heater! My hands are hurting right now.
 






How tough was the tranny rebuild?
 






Trans rebuild wasn't too hard with the service manual. There are a few special tools needed though. I had to improvise there, but it still wasn't bad.

The engine is running great, and all the old rattles and squeals are gone. I have about 250 miles on everything and no leaks or problems so far. Glad I got it done in time for winter. My G6 sucks in snow.
 






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