LMM: LMM with 222,000 tear down rebuild

malibu795

misspeelleerr
Apr 28, 2007
8,239
550
113
42
in the buckeye state
Christmas on Halloween
12065891_10207089777256396_3361294956947533418_n.jpg
 

malibu795

misspeelleerr
Apr 28, 2007
8,239
550
113
42
in the buckeye state
Everything is back from the machine shop for the LMM .040 block that broke a crankshaft.
Guess ~1300.00 isn't too bad
wash block/heads,
balance crank to original setup since nothing changed but the crank,
check 16 rods all where +/-.001 of 6.42",
deck/valve job on heads needs .004" to clean up, with 16 new exhaust valves, and valve stem seals
and another main bore.
Assembly today/tomorrow leave for Colorado tomorrow
 

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
3,890
44
48
44
ZEPHYRHILLS, FL

malibu795

misspeelleerr
Apr 28, 2007
8,239
550
113
42
in the buckeye state
If was balanced wrong and LBZ/LMM are same crank.. Both my LBZ and LMM where exactly the same .040 over finger pistons, bore balance.. LMM needed decked and mains done.. Neither where keyed

Then please explain why is my LBZ block that lived life at 500-700rpm higher then my LMM block is still running with 4x more mileage on it and still going?!?
 

malibu795

misspeelleerr
Apr 28, 2007
8,239
550
113
42
in the buckeye state
The reluctor wheel spinning on the crank threw the timing off enough to "backfire" through the intake and Stahl the engine, all while under a load..

I'd like to think most of US know timing can kill quicker then anything else
 
Last edited:

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
3,890
44
48
44
ZEPHYRHILLS, FL
If was balanced wrong and LBZ/LMM are same crank.. Both my LBZ and LMM where exactly the same .040 over finger pistons, bore balance.. LMM needed decked and mains done.. Neither where keyed

Then please explain why is my LBZ block that lived life at 500-700rpm higher then my LMM block is still running with 4x more mileage on it and still going?!?
It was YOUR words, NOT mine. YOU blamed the machine shop for your crank failing in the other engine, and said it was because they drilled the balancer to remove weight from it to balance the rotating assembly, and MANY said they felt the harmonics lead to the reluctor wheel pin shearing off. All I did was ask if they corrected the balancing issue that YOU said lead to your other crank failing.

Crankshaft was polshed and balanced. Don't do it right harmonics kill the crank faster.. In short version.. I'm sure others can expound on it
 

malibu795

misspeelleerr
Apr 28, 2007
8,239
550
113
42
in the buckeye state
Yep and all that was stated prior to finding the reluctor wheel had sheared the alignment dowel pin. Which was found the following day, along with the fact that the OEM balancer bolt is TTY bolt. Is that not how the thread goes?