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Old 01-07-2015, 04:34 PM   #1 (permalink)
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Exclamation Short block Teardown and inspection

Short block teardown and inspection
7bolt 4g63T

I had this short block dropped off at my shop about 8 months ago as a core turn in. The story I was told was it had less than 2000 miles on it. It was shipped in from another machine shop that specializes in the 4g engine.



First thing I noticed is the block head gasket surface was belt surfaced.


A closer view.


Next I checked crank end play.
By hand I could move the crank appox .050
I mount the indicator and zero it.


Next with a pry bar I pull the crank forward and get .063 of crank movement.


Also the oil galley balls were not removed so the crank can be cleaned.


After removing the rod caps, I noticed that the bearings are showing copper in an odd wear pattern, this leads me to believe that the crank rod throw, or the rod housing bore is finished on a taper.
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Old 01-07-2015, 04:37 PM   #2 (permalink)
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Also it looks like a fair amount of grit was in the oil.


The crank was ground .25mm on the mains and .50mm on the rods. The etching on the crank shows this.


The bearings were marked and the correct sized bearings installed.


The wear on the rear thrust can be seen easily.
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Old 01-07-2015, 04:38 PM   #3 (permalink)
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The crank is junk due to wear in the thrust face.


The 4th main got chewed into also from excessive crank end play.


So now the block is in the scrap pile.
The block had been bored .020 (.50mm) over and had evo pistons installed.
I measured the bores, and found 1 cyl .0005 tight, 2 of them were spot on, and the last was .0005 loose.
Next I measured one of the pistons and found it collapsed. The others were not measured at this time.
Not all the damage to this short block can be aimed at the machinist or the assembly of the engine. But the trash in the bearings, the taper to the rods or crank and the belt surfaced block can be, along with the inconsistent cylinder bores
The crank end play could be from an improper install of the girdle, or a heavy clutch.

There was a chunk of the oil pan gasket still on the block.


Once I removed the chunk of gasket, I found the machinist/assembler of this short block had signed his work.
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Old 01-07-2015, 04:43 PM   #4 (permalink)
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you make me fear getting my block checked and cleaned and all that other fun stuff now
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Old 01-07-2015, 04:45 PM   #5 (permalink)
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The moar is that this came from the same shop that did the head I posted....
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Old 01-07-2015, 05:03 PM   #6 (permalink)
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looks fine for a mitsubishi...never liked those cars.

good shit
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Old 01-07-2015, 05:29 PM   #7 (permalink)
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with all the DSM crank thrust wear issues, I'm surprised the aftermarket hasn't come up with crazy oversized bearings to allow these blocks/cranks to be salvaged
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Old 01-07-2015, 05:37 PM   #8 (permalink)
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I just spent like 3 hours reading BogusSVO threads. Good stuff!
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Old 01-07-2015, 06:14 PM   #9 (permalink)
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Shoebox.... I even got in touch with 2 bearing manufacturers and asked them if they would come out with them.

They would if I would order 200 sets
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Old 01-07-2015, 08:42 PM   #10 (permalink)
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Damn svo, u got a lot of time on your hands huh? Good threads. I kinda figured this block came from the same place as the head as u forewarned of the block to come. I think its funny the guy signed it as if he was proud of his work. Lol
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Old 01-08-2015, 08:50 AM   #11 (permalink)
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BogusSVO nomination for newb of the year 2014, maybe lifetime honorary mention as well.
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Old 01-08-2015, 02:10 PM   #12 (permalink)
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Originally Posted by robgoof View Post
looks fine for a mitsubishi...never liked those cars.

good shit
Is the mitsu good shit = mediocre stuff?


Or is that about the info?

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I just spent like 3 hours reading BogusSVO threads. Good stuff!
That noob signed up just to say that!



So you're the one attracting all of these noobs!!
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Old 02-02-2015, 08:22 AM   #13 (permalink)
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Free Bump for looking.
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Old 02-02-2015, 09:53 AM   #14 (permalink)
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That's bullshit.

Someone should order them. Prolly the shop that specializes in those engines,

The Crank Nitriding ground off?

What was in this for you?
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Old 02-02-2015, 10:53 AM   #15 (permalink)
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This specific shop is known for there sub par builds, and even worse customer service.

This customer turned this in as a core and got one of my short blocks.

The hardening is appox 1mm/.040 deep on these cranks

Also add into the fact these 7 bolt motors are known to crank walk with a heavy clutch installed.

There is no 1 thing I could point to and say this caused the fail.
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Old 02-02-2015, 03:31 PM   #16 (permalink)
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Also add into the fact these 7 bolt motors are known to crank walk with a heavy clutch installed.
I thought that DSM guys had figured this out a decade ago, but apparently not?
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Old 02-03-2015, 04:03 AM   #17 (permalink)
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No they know, hence why most do the "6 bolt swap" but there is only so many 6 bolts block left.

The ones that run 7 bolts have come up with different ways to try to cure it. But a 7 bolt is still a crap shoot.
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