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Afraid of the SOHC 4.0

Jd1088

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Year, Model & Trim Level
1994 jeep Cherokee
Thinking about purchasing a 96 Explorer, 4.0/4wd this weekend and I have to admit I am a little afraid of the SOHC 4.0, mainly because I see so many of them with bad motors. But at the same time, I know it's all in how that motor was maintained, and how far it was pushed in its lifetime. I've had a bunch of pushrod 4 liters, and I loved them, tough as nails. Is there any thing I should be looking out for when I go to check this truck out?
 



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The SOHC 4.0 engine was not available in 1996, only the OHV 4.0L. You are right to be afraid of the SOHC engine. It's a piece of crap, worst engine Ford has ever produced in my opinion. I have two right now and will be much happier when they both gone.
 






Avoid the SOHC, especially how old they are. My friend is a used car dealer and avoids selling them. In the span of 30 days he ended up replacing engines under warranty, sold with a 'little noise' at startup. Others failed later creating very unhappy customers.

I like the 95-96 V6 because the transmissions are a bit more reliable than the 97 5spd.
You can get the OHV until 2000, some even have manuals.

Best choice is a V8 though, hands down. Do not buy an SOHC, unless you can get it for near the cost of scrap. Those engines and transmissions are sitting at the top of the bathtub curve ready to drain your wallet.
 






While I agree that the SOHC engine is not as reliable as the OHV and the 5.0, I would not say it is a piece of crap (bad Koda! Bad, Bad!) There are lots of SOHC's with 100-150k+ miles on them. Mine has 201k miles. Yes, timing chain guides are an issue, and yes it is an over engineered motor. But a piece of crap is a bit much. If it were really that bad would there be so many of them still on the road? That said, I will readily admit that I am looking for another Explorer 2008 or newer with a 5.0 in it and not the SOHC.
 






I would go as far as to say that the sohc motor is a turd... there's no reason this day and age that a decently taken care of motor should easily last 200k with no real issues. The sohc motors rarely do this without a decent amount if work needing to be done.
 






Thanks for the input guys. I was always under the assumption that the SOHC started with the 2nd gens. Shows how much I know. I've always liked the OHV, I think they're great motors as long as they don't get overheated.

Yea I'd opt for the v8, I know a 302 like the back of my hand, unfortunately, they are way overpriced in my area. I've always wanted a V8 AWD Mointaineer, very good looking trucks.

So the trans in the 95/96's seem to be stronger than later models?

Thanks for all the input guys.
 






Our last 99 Sport that my wife & I sold a couple years ago that we owned since new had 275K on it & was never opened up. All we did was regular maintenance.
 






I've seen lots of SOHCs with 100k on them...at the pick your part! :)
 






There are also lots of 5.0 and OHV's at the pick-ur-part that have not been maintained. Are they a POS because they only got 75k miles before being was junked?
My point is not that the SOHC is better or as reliable as a 5.0 or OHV, only that it is not the POS that haters want it to be. If properly maintained and not overly modded or abused, the SOHC can, will, and has, gone 150+ miles for many people. As I stated, mine has 201k on it and still reliably on the road. If you really want to talk about a POS engine then bring up the GM V8-6-4 L62.
 












Before my v8 swap my 97 sohc went over 260000 it is a strong motor and if they had put the chains all on the front like a 4.6 and offered a twin cam , ie the BOB /BOA 2.9 setups then we would have had something
 






the 4.0 sohc is a time bomb. Its not a matter of if but when the chains will go. Plastic components that can cause the engine to detonate aren't a good idea.
 






Maybe it's that we read all the horror stories here about the 4.0L SOHC and seldom hear about the ones that go over 200k. We have one in our "fleet" that's now over 260K (albeit on a rebuilt engine) and the only thing it currently needs is intake O-ring/gaskets, but from personal experience I really don't have anything good to say about this engine design. It's just too fragile. If I had to have a V6 I'd pick the OHV all day. Fortunately there's the 5.0L V8, at least in the 4 door version. At some point in the not-so-distant future none it the Gen II's will be around, but I gotta believe most of the last remaining ones will be the 5.0's.

Why do some vehicles live longer than others? Maintenance has a lot to so with it, along with driving style and how the production tolerances stacked up during assembly.
 






260k on mine SOHC only use synthetic no issues at all no rattle nothing. Just occasional rough idle you can feel in ur back
 






It would be interesting to know the build numbers on the different engine designs. How many of each were made...
 






I agree that the condition of a SOHC V6 would be a factor IF that year had them, but let's get real. It's now a 20 year old vehicle so it's past the type of normal early failure issues present on many vehicles and at this point anything could fail and everything should be looked at carefully.

In particular look at the big ticket items. Engine noises, smooth/reliable shifting, 4WD problems (if 4WD is needed), even little things (if important where you live) like needing new A/C compressor can come near doubling your costs, or the sum of intermediate cost things like half worn out vs completely worn out tires, rusted out exhaust, check engine light indicating it may need new sensor(s), rotting hoses/belts/spark plug wires (general engine bay conditions can mean everything is about to go out), suspension problems, severe rust, etc.

Point being, at this vehicle age it's pretty easy for typical wear out items (on any vehicle of this complexity, we're not talking about a Honda Civic!) to equal or exceed the purchase price if you're not heavily into finding cheap parts and DIY repair. On the other hand, then you have the problem areas fixed and expected to last a while.
 






260k on mine SOHC only use synthetic no issues at all no rattle nothing. Just occasional rough idle you can feel in ur back

Good to hear. I've got just under 150K on mine but it is a 98 and when the SOHC first came out that year they knew the screwed up with the first design of the chain components and my components were replaced for free at 40K miles. So I expect to hit 200K on the odometer at least.
 






My SOHC has the improved steel back guides, new chains and tensioners. Did them all 2 years ago and the engine is great. 300.000kms and I expect it will go a lot longer.

My next engine will be a turbo diesel.
 



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Flash, what brand of replacement parts did you use? Curious why these guides are plastic.

All metal possible, or is it a wear and noise issue? Would be an aftermarket gold mine if so.
 






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