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#1
08-28-2025, 03:15 PM
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2015 E350 4matic m276 in shop with locked up engine
The E class that I just went thru front d/s failure on is now back with a locked up engine. Owner said it was knocking then stalled. He towed it in and engine will not turn over with long breaker bar. Anyone seem this? I was under impression the 276 engine was a good engine. I talked to friends at dlr in Macon and they said they have not seen a locked up 276.
Car has 167k miles and oil level looks good, oil was last changed during May.
__________________
Jim 
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#2
08-28-2025, 04:15 PM
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Bad crankshaft bearings? Was it recently rebuilt and used bad bearings?
I had a 409 when I was a kid; the mechanic rebuilt it with bad bearings and the engine was completely locked when we fired it up. Tore it down and used new bearings and it was fine.
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#3
08-28-2025, 04:49 PM
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hydro lock?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#6
08-31-2025, 01:04 PM
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Very unusual. I have heard of timing tensioner failures here and there, but you would have heard it on startup, given your time with the driveshaft failure.
I imagine anything causing poor oil pressure (ie clogged pump screen) would have thrown a code before catastrophic failure.
__________________
TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth
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#7
08-31-2025, 01:16 PM
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Owner said it was knocking before it stalled (locked up).
Only 276 engine failure I found on youtube was because serpentine belt went thru front main seal. Guy tearing it down finally got to a locked up oil pump but did not see any reason why it had locked up.
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Jim
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#8
08-31-2025, 02:20 PM
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Quote:
A variable speed/variable displacement oil pump must certainly constitute a crime against nature!
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#10
08-31-2025, 04:08 PM
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I'm wondering about the owner's history (miles on it) with this car. How long has he owned it, why an AWD sedan in Georgia, etc?
Why the attachment for a car this old where there's nothing that special about a 10+ year old E350? Buying and dropping a new engine in it? Were I him, I'd probably buy a creme puff pre-owned S550 sedan with low miles. Especially after the AWD failure.... Quote:
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'06 E320 CDI '17 Corvette Stingray Vert
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#12
09-02-2025, 05:05 PM
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That's for a short or a long block?
Quote:
__________________
'06 E320 CDI '17 Corvette Stingray Vert
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#14
09-11-2025, 07:42 PM
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That price is a pretty good indication that the M276 doesn’t fail too often.
I bought a complete M112 engine from a local junkyard maybe 8 years ago for $500 for the same reason - they had 5 in stock to choose from.
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#15
09-11-2025, 08:15 PM
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Swap in a M156 and give the customer the shock of their life!
__________________
TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth
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