Project Monty - Adventure in Engine Teardown

DanielDD

Vehicle Masochist
A couple of weeks ago I picked up a 2000 Endeavor with a known engine issue and promptly began to investigate. Search for "New-Owner-2000-Montero" for the background story.

Since then I have just decided to pull the complete engine to determine the root cause of the coolant in the combustion chamber issue. At this point the engine is ready to be lifted out of the vehicle, I am just waiting for a 2nd set of hands to help me guide it out of the engine bay. This should occur in the next couple of days. It is my hope that I can document the engine teardown in this thread, which will be unlike most of the build threads here - as they are mostly focused on building up the Montero - making it more off road worthy. Mine on the other hand will be focused primarily on engine teardown and build up - making it reliable before embarking on outfitting it for off road use.

A few points I would like to elaborate on involving the task of getting the engine ready for extraction…

This is the nastiest engine and undercarriage I have encountered in quite some time. Even though the vehicle had a stack of documentation by an independent mechanic, they took no effort in cleaning anything and over time the engine, suspension, front differential and transmission has been covered in a nice thick goo of grease and grime. :Wow1: Geez, I hate working on a nasty *** vehicle like this. One of the 1st things I'm going to do when I have the engine out is fire up the pressure washer and give the suspension and engine bay a thorough cleaning.

Next, I don't care how good a mechanic is, they don't have a vested interest in "your" car other than performing the least amount of what is required to return the car to service. While getting the engine ready for removal, I found various nuts and bolts that were not the original OEM parts. This engine has gone thru at least 3 timing belt changes and it seems they somehow lost some of the original bolts and substituted whatever they could find. Also encountered broken tabs on some of the connectors, notably the fuel injection connectors. At this point, I think it would have been better for me to have bought a Monty that had not been touched by a mechanic so then I would at least have all of the original hardware.

Getting to the upper two bell housing bolts was a trying experience that tested my patience (of which I have little). It was necessary for me to remove the plenum, the intake and the coolant crossover tube in order to both access the upper bell housing bolts and to have enough leverage to break them loose. The V12 in my BMW 850i was easier than this. I am also flabbergasted by the sheer number of nuts and bolts necessary to hold all the accessories, wiring, hoses, lines, etc to the engine. I've never seen something so complicated in all my life - surely Mitsubishi could have designed the exterior of the engine better than this. Having to remove the plenum to get to the driver's side spark plugs is sheer madness.:yikes:

Well, I wanted a project vehicle and I got my wish, so I really shouldn't complain at all. I actually enjoy working on vehicles when I have time. This is not my primary vehicle and I've got a decent place to work on it. It keeps me from doing stupid stuff like watching the Bachelor on TV…

My biggest fear at the moment is determining root cause of the coolant in the #3 combustion chamber. When I removed the spark plug and peered in the combustion chamber it was actually flooded with coolant. I suctioned out an ounce of coolant. That just ain't right folks. Maybe it is just the head gasket and not a crack in the cylinder head, or worse in the block. Funny thing was, when I got the vehicle, it ran great, if you ignored the thick white vapor cloud from the exhaust.:oops:

No pictures at the moment because there is not a lot to see at this point. I should be able to update this thread Thursday evening. Come along for the ride, it will be fun.
 

mudraider

Adventurer
Looking forward to reading of your findings and rebuilding. I appreciate all the clamps and tied owns Mitsubishi did. After wheeling them, hard, then driving home with the a/c kicking while my jeep buddies are sweating their ball$ off, I have realized, all the clamping and securing is what has kept the a/c working great on vehicles over 200k on them.

sent from my pretty good Android phone
 

RyanY

Adventurer
I'll put my money on a blown head gasket, caused by overheating due to some cooling system issue (stuck aftermarket thermostat?).
 

RyanY

Adventurer
Looking forward to reading of your findings and rebuilding. I appreciate all the clamps and tied owns Mitsubishi did. After wheeling them, hard, then driving home with the a/c kicking while my jeep buddies are sweating their ball$ off, I have realized, all the clamping and securing is what has kept the a/c working great on vehicles over 200k on them.

Right there with you on that - the Montero seems to have every harness and hose secured in as many ways as possible, with bolted-on brackets and clamps everywhere. It's the opposite extreme from the 85 IROC-Z Camaro I once owned, which had bare minimum bracketry (usually secured by sheet metal screws) - typical of the miserable build quality from domestic vehicles of that era.
 

DanielDD

Vehicle Masochist
I'll put my money on a blown head gasket, caused by overheating due to some cooling system issue (stuck aftermarket thermostat?).

Sure hope you are right. The PO told me the issue cropped up RIGHT after he had the timing belt changed out. We'll know soon enough….
 

DanielDD

Vehicle Masochist
Ready to pull it….

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She is OUT!

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Needs a thorough cleaning in there.

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Can't mount it on my engine stand as I don't have the right length bolts. Looks like M12 bolts. I need 4 at least 4 inches long, so it will sit on the floor until I can get the necessary hardware tomorrow. Then I can start breaking her down to determine the cause of coolant in the combustion chamber...
 
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Salonika

Monterror Pilot
If I remember correctly, I did the upper bell housing bolts from underneath the truck, with a long extension. I remember laying with my feet facing the front of the truck.....good times. And all that oil and grime? Rust prevention. I just left it.
 

DanielDD

Vehicle Masochist
Update: Got the engine mounted on the stand last week and proceeded to perform the teardown. It appears there was a breach in the head gasket on the passenger side. No other damage to either the block or the heads were immediately evident. The Mitsubishi cylinder head gasket is comprised of two steel pieces sandwiched together and according to my machine shop guy, it is a good design for head gaskets. However, one side of the steel gasket surrounding one of the water pathways was found to be fallible and was missing some material. How and why I am not sure. I will supply a picture later this evening showing what I believe is the culprit.

Further teardown was uneventful. Lots of tan/brown oil contamination with the coolant all throughout the engine internals, but did not do any further damage to the crank, nor the bearing surfaces. Although at 250K miles, the bearing surfaces are certainly used up. Pistons and piston walls look fine, there was no noticeable ridge at the top of the cylinders, so the pistons came out easily without having to use a ridge reamer.

I was disappointed to find that Mitsubishi does not mark their connecting rods with the appropriate cylinder designation (1-2-3-4-5-6) as I have found in other manufacturers, namely American and European engines. Does not really matter at this point because the block will most likely get an .020 overbore with new pistons and wrist pins. Also having the crankshaft micro polished (oil feed holes are already chamfered- which is a good thing) and re-sizing of the connecting rods - if they need it. Cylinder heads will have a full cleaning and valve job and resurfacing if needed. I dropped everything off at the machine shop yesterday and have 2 full totes at home that have all the accessory stuff and engine bits that need to be cleaned, plus a host of bagged and tagged parts that need to be cleaned as well - so there is much to do while the engine is at the machine shop.

Will supply pictures later on this evening..
 

coffeegoat

Adventurer
Man, looking at that pull job it might actually be easier to pull the engine to do a timing belt job... Just so you aren't spending all day hunched over the front gril..
 

DanielDD

Vehicle Masochist
As promised…

As you can see, the cylinder head and the crankcase has the nasty residual milkshake mix all throughout the engine.
A closeup of the cylinder head gasket where I believe the root cause of the infiltration of the coolant into the combustion chamber occurred
One of many bagged and tagged parts needing cleaning as well as a full layout of both cylinder head components needing cleaning while the heads are at the shop
Lastly, got my seats recovered by a local upholstery guy…
Note - you can click on the pictures to get a more close up view.
 

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DanielDD

Vehicle Masochist
Seats were $400 each. That is not leather, it is vinyl. Leather was going to be $200 more per seat. Couldn't justify it as this is a project vehicle, not a show car :)

I don't have any good pictures of both the engine on my old engine stand. It is all torn down and the major components at the machine shop. However, I bought a new engine stand for the Cobra V8 engine I am building. I like this stand much better as it has the ability to rotate the engine with a gear reduction drive which makes rotating the engine much easier. Also, my old stand wasn't very stable. You can tell the new one is much more stable (having a Tee at the front of the stand).
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