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Blown Engine, And How!
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Redbarnresto
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PostPosted: Wed Oct 10, 2012 11:12 am    Post subject: Blown Engine, And How! Reply with quote

Thought you guys might like to see this. This engine came out of a Bus a customer of mine bought. He never saw it running. We were hoping it'd be a perfectly good little engine, but were prepared for the worst. We sure got it!

The engine would spin back and forth but not 360 degrees. It'd spin maybe 330 degrees one way or another and then smack into something. I pulled the valve covers off and noticed that none of the valves open and close at all, they were all just dead level with each other and wouldn't move. I knew that could mean only one thing.

I started tearing the engine apart and found #4 rod up through the case, which the fan shroud was hiding.

Here's what's left of #4 connecting rod. Both nuts are still on!
Image may have been reduced in size. Click image to view fullscreen.


Damage to the crank.
Image may have been reduced in size. Click image to view fullscreen.


The camshaft, or should I say camshafts?
Image may have been reduced in size. Click image to view fullscreen.


The entire case is filled with this stuff.
Image may have been reduced in size. Click image to view fullscreen.


This is interesting. All the intake valves are black except that one that was on #4.
Image may have been reduced in size. Click image to view fullscreen.


Not sure what happened first that caused all this, but I'm sure some of you will have theories. The oil was very low (though it could have been sitting for years and dripped out), and there was also no front engine tin which would have made the engine run hotter than usual. There was one of the six main case nuts missing, and some of the others were loose.

Definitely the worst failure I've seen!

Dan
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Bashr52
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PostPosted: Wed Oct 10, 2012 12:17 pm    Post subject: Reply with quote

That is intersting that it was the #4 that let go. If it was the #3 it would be more understandable.....
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HRVW
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PostPosted: Wed Oct 10, 2012 1:12 pm    Post subject: Reply with quote

Laughing Picture was NO big deal for me as I've seen loads of them during my engine building yrs....comes with the territory.

One part fails or lack of oil and KABOOM.
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[email protected]
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PostPosted: Wed Oct 10, 2012 2:22 pm    Post subject: Reply with quote

Thank you for a perfect picture of what I always tell people. Stock connecting rod bolts DO NOT BREAK. The rod itself will come apart before the bolt will.

Sorry about the engine though Embarassed
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vugbug68
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PostPosted: Wed Oct 10, 2012 2:36 pm    Post subject: Reply with quote

spun rod bearing, rod got too hot and bam. Heads actually look pretty good
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JoeD
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PostPosted: Wed Oct 10, 2012 3:12 pm    Post subject: Reply with quote

Yes spun rod bearing. Obvious in the photo. It burnt pretty badly.
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modok
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PostPosted: Wed Oct 10, 2012 4:51 pm    Post subject: Reply with quote

#4 is the most common rod bearing to go out first. i don't know why, we'll probably never know exactly what started this one to go either, all the incriminating evidence has destroyed itself Shocked

Of course, it was probably just low oil pressure.
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SamT
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PostPosted: Wed Oct 10, 2012 5:09 pm    Post subject: Reply with quote

I love tearing into exploded engines, as long as they are someone else's. That looks like it was in an engine blow contest, about par for my experience with bus engines especially type 3.
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75smith
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PostPosted: Wed Oct 10, 2012 5:10 pm    Post subject: Reply with quote

modok wrote:
#4 is the most common rod bearing to go out first. i don't know why, we'll probably never know exactly what started this one to go either, all the incriminating evidence has destroyed itself Shocked

Of course, it was probably just low oil pressure.


huh, interesting I was talking with my dad today and we got on the subject of rod bearings and he said he see's the #3 or #1 go most often
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vugbug68
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PostPosted: Wed Oct 10, 2012 9:25 pm    Post subject: Reply with quote

#1 bearing is the one i've seen spun the most.
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modok
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PostPosted: Wed Oct 10, 2012 9:28 pm    Post subject: Reply with quote

Maybe it depends what caused it?
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1432
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PostPosted: Sat Oct 13, 2012 7:22 am    Post subject: Reply with quote

modok wrote:
#4 is the most common rod bearing to go out first. i don't know why, we'll probably never know exactly what started this one to go either, all the incriminating evidence has destroyed itself Shocked

Of course, it was probably just low oil pressure.


oil delivery problems usally affect #1 & 4 rods first due to shared oil feed thru single passage at center main.
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