LMM: LMM with 222,000 tear down rebuild

malibu795

malibu795

misspeelleerr
Apr 28, 2007
8,231
545
113
42
in the buckeye state
Most know that I run my 07.5 LMM as a hotshot.. Fully load trailer weighs ~28,000lbs. Got the truck with 97k on it been towing 7,000-28,000lb trailer. For vast majority if those miles.
Currently has efi live, lift pump GT4088R with a T3 .85 waste gated housing and stock trans.. Dynos right around 400/800 at the tires. An extra 50-75hp would be nice but not needed.. Stock cp3 fueling is as far as I go..
Coming home from a Dallas run truck put a hole in #8 piston..

Current plan is/was mahle finger 17.5:1 pistons bore in balance.. Apon tear down I have found something that I don't like/not sure about... Which might lead to rods being replaced.
Oil sample said there was high levels of cooper and iron.
So pictures..
10922810_10205936151616476_6349219731803552697_n.jpg

Best rod bearing #7
11377330_10205936151776480_1830364895739302677_n.jpg

Worst rod bearing #4
11070783_10205936156096588_1430267167351806700_n.jpg

Bootom side of mains
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Topside of mains
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Perp hole on #8
11214032_10205936155256567_7928269177750241796_n.jpg

#8 cylinder
10731033_10205936156576600_4998303508518136386_n.jpg

#2 rod
11214277_10205936152696503_3468543853854836093_n.jpg

Random progress shot
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Skirt wear #8
10984026_10205936154016536_384960630318339415_n.jpg

#2,4,6,8 skirt wear.
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PureHybrid

PureHybrid

Isuzu Shakes IT
Feb 15, 2012
3,492
472
83
Central OH
Something needs to be machined when using LML rods and older pistons but I can't be 100%.

As for the rod, that piece might be from the fracture process. Other than the piston with a hole and that cyl, nothing that concerns me.
 
coker6303

coker6303

Keep Calm and Chive On!!
Aug 6, 2009
2,484
0
36
40
Houston, TX
Damn you have some tough luck.

From what I understand, the lml rods/pistons are bolt in as a set but I'm not sure on over bores.

Wonder if the bearing wear is from oil temps and lack of lubricity?
 
Bersaglieri

Bersaglieri

New member
Dec 28, 2013
82
0
0
So you had a hole on the edge of the bowl and the oil ring land?! Wow! Good luck man. I hate to say this but I've seen more than one LMM at the dealer getting a new motor from frequent towing.
 
02greysixer

02greysixer

Active member
Jun 4, 2011
1,829
7
38
North Central FL
I bet the bearing wear is from coolant in the oil thanks to the bad cooler. I would upgrade to aftermarket pistons but that's just me. I just put an engine in an lml because one piston looked like yours and the other 7 all had various degree of cracking. Truck pulls 10-12 pretty much anytime it's moving with h&s tow tune and had 260k when it let go.
 
malibu795

malibu795

misspeelleerr
Apr 28, 2007
8,231
545
113
42
in the buckeye state
Well onr could look at it this way.... Sure is easier to clean all that contaminated oil out! :roflmao:

Sure the coolant didn't help lubricity.. Gotten mixed opinions on usingbtge smelling HV 316 pump.. Most like delete the OEM oil cooler to
 
PureHybrid

PureHybrid

Isuzu Shakes IT
Feb 15, 2012
3,492
472
83
Central OH
I know you didn't have good luck with the factory cooler, but I'd rather keep one on it and run a secondary. Oil temps will be more consistent with changing outside temps.
 
malibu795

malibu795

misspeelleerr
Apr 28, 2007
8,231
545
113
42
in the buckeye state
Goodies box..
10425108_10205978661159188_5203368744282043650_n.jpg

So side by side.. Shared wrist pin..
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21687_10205978777322092_8276142874225649409_n.jpg

One of my friends pointed out bushing on the right is rotated...outside the substantial burnt oil right under the bowl.. Anyone else seen bushing do that? This is the failed piston too
11390033_10205978755441545_4632062947888341283_n.jpg
 
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