Lost the motor?

danzick

playing with fire
Feb 20, 2014
447
1
18
Livingston, MT
Ah. I assumed dropping a valve meant the keepers popped off and the valve fell in the cylinder. What would hurt the crank if the journals look good?
 

TheBac

Why do I keep doing this?
Staff member
Apr 19, 2008
13,897
256
83
Mid Michigan
I probably shouldnt have said it that way, but it sure looks to me that you broke the heads off the valves which took out the piston. If you did float the valves like we think, the piston wouldve hit them and broke them off. Im shocked at the damage in the other cylinders on that side.

Have the crank thoroughly tested if you decide to reuse it. I wouldnt reuse the cam.
 

danzick

playing with fire
Feb 20, 2014
447
1
18
Livingston, MT
I probably shouldnt have said it that way, but it sure looks to me that you broke the heads off the valves which took out the piston. If you did float the valves like we think, the piston wouldve hit them and broke them off. Im shocked at the damage in the other cylinders on that side.

Have the crank thoroughly tested if you decide to reuse it. I wouldnt reuse the cam.
im also curious about that? how did those pieces make it into the other cylinders? through the intake valves?
 

ZeroGravity58

Active member
Mar 23, 2008
1,250
20
38
35
Maryland
Yes, pieces probably went up the missing intake valve into the runners and got pulled into other cylinders. I would buy a new stock crank. I seriously wouldn't use anything from that motor. If you cracked a piston I wouldn't think twice about reusing the crank and cam. After seeing that is buy new or buy a complete motor
 

danzick

playing with fire
Feb 20, 2014
447
1
18
Livingston, MT
yeah.. I have the engine completely torn down now. aluminum got into the bearings. the bearings were pretty bad, but the crank does still look decent. I am going to hold onto it just incase, and if for some reason I do need it, I will have it fully checked out and polished, but at the moment, I am on the hunt for a used complete long block. What kind if mileage should I shoot for to not have to really mess with the crank/bearings and heads? I would like to find a good used engine, and do some deliped stock pistons, forged rods, studs, and possibly have the cam keyed. This truck gets about 1500 miles a year, so even if I could confidently get 50k or so out of it before it needed attention again, thats like 20 years for me haha.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
18,134
399
83
Phoenix Az
with as much destruction as you have, this is one of those "what came first, the chicken or the egg". you can look at all the rest of the pistons for cracks at the lip area and that might give an indication that you have a cracked pistons if more have cracks but again, its hard to say.
 

Nate’s Dmax

Member
Dec 11, 2020
64
11
8
Hicksville Auto Recyclers would be a good place to start on the search of a used bottom end. I don’t know if miles would be to much of an issue if your gonna go through it anyway.
 

danzick

playing with fire
Feb 20, 2014
447
1
18
Livingston, MT
Thanks for the tip. I might go look at a truck tonight. It has 300k on it. Guy claims the bottom end has 160k from an 04 lly. Swapped the heads to put in his truck and didn't do the heads right I guess and blew the gaskets. He wants 3k for the truck. It's a beat up pos. Have I lost my mind? Lb7s are hard to find in Montana.
 

Nate’s Dmax

Member
Dec 11, 2020
64
11
8
If your into trying to get rid of extra parts 3,000 isn’t too bad. Wouldn’t hurt to see if he takes less. You could probably have yourself what you need pretty cheap by selling the good parts you don’t need.
 

danzick

playing with fire
Feb 20, 2014
447
1
18
Livingston, MT
yeah I thought better of it. Im going to look for another one. ill give that hicksville a call tomorrow. My uncle found one right by him in Oregon with 170k for 3500, but i thought that was a bit much for the miles. plus the 10 hour drive.
 

juddski88

Freedom Diesel
Jul 1, 2008
4,417
18
38
Chesterfield, Mass.
I'd recommend trying to find something out of a rust free area if you can. Out here those complete take outs are cheaper but everything on them is usually rotted
 

danzick

playing with fire
Feb 20, 2014
447
1
18
Livingston, MT
Oh for sure. A local yard wanted to sell me a Minnesota engine last week. I declined and he didn't blame me haha. Mt engines are usually pretty good. And according to my uncle the Oregon one is clean.
 

Nate’s Dmax

Member
Dec 11, 2020
64
11
8
Yep good people they are at Hicksville. At least your looking a LB7 and not for a LML because they can’t get them done fast enough for the demand.
 
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NC-smokinlmm

<<<Future tuna killer
May 29, 2011
4,747
46
48
At Da Beach
Look in Florida for rust free, tons of lb7's down there from farming. LML's were the longest running engine code for Duramax so far, 11 to 18.
 

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