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That Ford 4.0

R

rrlund

Well-known Member
When I got home last night,Jon had that Ford 4.0 all apart. The bolt was broke in the back end of that jackshaft. The timing chain guide in back was broke,the ones in front were getting bad. They have automatic tensioners to keep them tight and were working,but either that bolt broke or the guide broke,just don't know which one happened first.
The valves are recessed a good half inch,so none of those were damaged. The bearings all looked excellent for an engine with 269,000 miles on it. Cylinder walls looked real good.
It didn't look promising to try to get that broken bolt out of the jackshaft. It's Ford only and is $351 with no bolts. Then add on the chains,guides,tensioners,gaskets,etc,it was gonna run in to some money. I found one in a wrecked 02 (same as ours),119,000 miles on it. Inside of the oil filler cap looks clean as new,oil looks clean,$700 exchange so I bought it.
 
Was wondering how you cameout with that. Probably the better way to go. Still costly and a lot of work!
 
A lot of work is right. I asked if he'd have that one out Monday or Tuesday. He looked a little shocked and said tomorrow. I said OK,call me when you get it out then. You're faster than we are.
That was a miserable job and putting it back in is gonna be worse.
 
That is GREAT mileage out of a 4.0 SOHC
You did the correct thing, I sell OEM
Ford parts & they are costly, & that engine
isn"t nice to work on... Good luck with it.
 
Before you install it, put the cam chain cassettes in it along with the primary and balance shaft tensioners. Pretty common failures. The engine needs to be out to do the right hand cassette.
 
I have a 2000 4.0 Ranger, I think the last year of the OHV. A couple of years ago one of the heads developed an internal crack (I was told this was not uncommon on these motors), and my son found some brand new heads from Australia in West Virginia that cost as I remember $169 for the pair including valves, seals, springs. All I needed was new bolts (one use, they stretch) and a gasket set. I put it all together and have 100K on the new heads. I am very happy. The dealer I bought them from said these new heads were cast heavier in the areas the old ones were prone to crack. I guess the OHC 4.0 from 2001 on is much harder to work on.
 
Ya they're an SOHC. Danged things have 4 chains in them. One in front to a balancer,one that comes up to a jackshaft,one in front to the left cam off the jackshaft and one in the rear for the right cam. The heads are both the same and can be switched from one side to the other. That little diddy is the only reason I can figure for that setup. They ran that shaft through there just to cut costs and only have to build one head to fit either side.
 
Getting ready to go through the same thing on my wife's explorer, again. Darn chains are getting noisy as heck. Fixed it once at around 100k. It now has 200k on it and it is time again. That engine is really shoe horned in there and is no treat to get out. Too bad the timing chains are just not all that long lived. The rest of the engine seems pretty solid. Heck of it is you can pick these trucks up running pretty cheap. Almost makes it not worth the effort to fix the old one, but beats a car payment on a new one.

Greg
 
If the engine you are buying has 119,000 miles on it I would buy the gaskets and check out the timing chains on it before I fought it back into the vehicle. I know you got 269,000 on the first motor but I also personally know a hand full of guys that did not get 100K on them. They changed the oil when they should have too. This engine has a design issue. It is crap shoot if they last or not.
 
The sad thing is that the 4.0 was a great engine when it had the old style cam setup. When they had to go to the overhead cam setup for emissions the engine has been a pain.
 
I'm not enough mechanic to understand how a OHC can reduce emissions, because of higher RPM operating speeds? I don't know.........but the other thing is, wow....I bet its a bear to get the timing right on it........I think you did good getting another engine so cheap. Good for You!
 
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