blown up 4.0

[Stranger ranger]

Just curious to see who here has blown-up a 4.0, preferably an OHV engine. I've seen these last many moons and then some not see 100k. If you blew one up, how'd you do it? I searched and found nothing on the topic.

 

[parkrangerjeremy]

i have blown up two of them already one had 170,000 and suck mud up the intake and started knocking and the other was a junk yard motor with unknown miles on it and the oil pump sh** out on it and started knocking other then that they have been real strong motors.

 

[Stranger ranger]

Those really are the only two reasons i've ever heard of someone destroying one of these engines. hydrolocking or the oil pump. Unreal. I guess the oil pump just works or it doesnt.

 

[Kona]

You forgot cracking the heads...I know of 2 Explorers and one Ranger that have 4.0 's that have done that and read about a few more.

 

[Sasquatch_Ryda]

metalmacguyver put a rod through his 4.0 block.

 

[Ranger44]

You forgot cracking the heads...I know of 2 Explorers and one Ranger that have 4.0 's that have done that and read about a few more.

The heads are a sore spot on the 4.0(BUT not anywhere near as bad as the 2.9's). So are the pushrods and rockers. There are ways to fix these. A set of new cast heads, and a set of hardened pushrods and rockers.

metalmacguyver put a rod through his 4.0 block.

Another victim of hydrolocking. He'd hydro'd that thing a few months before. It just finally gave.

 

[Evan]

The 4.0 does not respond well when it sucks in water:

I rebuilt mine with new rods, pistons, rings, bearings, gaskets, pushrods, rockers, injectors, crank, water pump, thermostat, and idler pullys.

I'm still running the original oil pump, timing chain, and heads. Engine has at least 300k on it.

 

[redneck15431]

Yeah, the 4.0's are pretty tough. I've read about a few blowing up, such as this thread, but personally never heard of anyone blowing one up. I've ran mine pretty hard over the past 4 1/2 years and it hasn't missed a beat yet. And we all know how a 17 year old treats his first vehicle..lol.

 

[Stranger ranger]

If it goes out I want it to go out instyle, rod through the block sounds pretty sweet. I've sucked in just about enough water to make me pull the plugs, but i've never bent a rod doing it.

 

[Ranger#1]

you think uv sucked water ha

 

[AllanD]

My brother blew the engine in his '90 supercab

Stuffed the #5 rod out the drivers side of the block and the chunk of block dislodges shorted out the battery wire to the starter motor, that started the inner fender on fire and that and the bath of oil everywhere made a quickly uncontrollable fire...

The truck burned itself to the ground, it literally melted the bellhousing off Tranny case
I still have the glob of resolidified aluminum

Cryin shame, it had a full tank of gas in it...

AD

 

[Bird]

Shattered 3 pistons with 10# boost and 33 degrees of timing - does that count ?


Bird

 

[swickwake]

my original 98 4.0 ohv burned up the number six rod bearing. thus caused a little valve slap. it only had 85,000 miles on it.

 

[JoeCanada]

My 4.0 cracked the heads at 234,000 km (~145k miles, for you American folk). I found out when it overheated during a 300km drive on a 25°C day while towing a trailer. Probably happened before I got the truck, as it had a badly leaking lower intake gasket.

Cooling system maintanence...very important!

 

[wahlstrom1]

Here's the broke 4.0L from one of the trucks I owned while SASing my green one. Buddy wound it out in 5th down hill, grabbed mexican overdrive then popped it back into 3rd instead of 5th when he threw a rod.