Duramax Diesels Forum Truck of the Week
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Old 08-12-2018, 04:49 PM
tsd_billy tsd_billy is offline
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Default Lb7 carnage again.....

Well i just cant beat this freaking engine idk if it was lack of lubrication or too much rpm for the bearings i used but the pictures and story will start here as i tear it down this week. This has been the 3rd and final push to get an entirely different block and go full lly drivetrain


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Old 08-12-2018, 04:50 PM
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Old 08-12-2018, 06:41 PM
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WTF did you do?
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Old 08-12-2018, 06:49 PM
tsd_billy tsd_billy is offline
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Spun the rear main


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Old 08-12-2018, 06:51 PM
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My machinist believes my oil pump failed and starved it


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Old 08-12-2018, 07:16 PM
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I hate to ask this, b/c its got to be painful, but just what RPM were you running? What bearings? What oil pump?
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"BBT" -- 2003 GMC CC/SB 4x4 12.14@111.15
"The Cruzer" -- 2014 Chevy Cruze Diesel -- the fun little DD
"Kleshay" -- 2000 C5 Corvette -- the toy
"The Bigger Boat" -- 2011 Workhorse P700 - 6.0LS/Allison - what I drive at work


Two wrongs dont make a right, but three rights do make a left.

Reality is a matter of perspective.

This forum isn't for the weak of heart.....or wallet.

"Lets build a race car they said. Itll be fun they said. I don't know who "they" are.........but they need a good punch in the face!" -- mufflerguy (yb)
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Old 08-12-2018, 07:22 PM
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Quote:
Originally Posted by TheBac View Post
I hate to ask this, b/c its got to be painful, but just what RPM were you running? What bearings? What oil pump?


Well. 4900 rpm
Melling replacement oil pump and mahle h bearings
Had about 2k miles on it and getting on i40 she just lost oil pressure but not enough to set the light. I was running 80 mph at 20psi and i didnt notice how low till i got off about 5 miles later and came to the stop sign and it dinged. I immediately killed it and called my shop hand to bring a trailer. Unloaded it and it had a miss, pulled balance rates and checked the oil, it was full of diesel and 7 was at +14 so we replaced that injector. Dumped lucas additive in with fresh oil, Drove good for 3 days then it started making a scratching noise that brought me to this point.
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Old 08-12-2018, 07:26 PM
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It hurts but nothing is forever and learing in this game is expensive. Lly or lbz swap sounds more logical at this point.

Everything of value besides the block is in good working order. I just wish the block and crank didnt need to be replaced lol. Callies crank has some scratches but its savable which has me sold for future engines


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Old 08-12-2018, 07:45 PM
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So it cracked an injector? What turbo were you running to need 4900rpm?
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Old 08-12-2018, 08:25 PM
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Don't blame the engine. Operator error caused it.
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Old 08-12-2018, 09:35 PM
tsd_billy tsd_billy is offline
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Quote:
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So it cracked an injector? What turbo were you running to need 4900rpm?


I guess i should be more specific in my word choice. I built with plans to go high hp in the future. It never saw over 3600 on the highway which has been all of its miles in the last 2 weeks. The only time its seen 5 was when the trans let go in the first week lol


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Old 08-12-2018, 09:37 PM
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Quote:
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Don't blame the engine. Operator error caused it.


Hey it is what it is :shrug:
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