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Author Topic: Scoring on engine cylinders- 8V92  (Read 784 times)
Seville
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« on: October 07, 2012, 08:02:35 AM »

I need your collective advise here please.

 What exactly is scoring on an engine cylinder ?
What would cause it ? These questions pertain to an MCI 96A with an 8V92.

Would severe overheating cause this? My guess regarding a repair is an in frame rebuild?

The bus is in Denver. In it's present condition. Can this bus be driven a thousand plus miles to Los Angeles ?
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New York City
1984 MC9 6v92T
Frank @ TX
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« Reply #1 on: October 07, 2012, 08:11:13 AM »

HI Seville
Yes overheating canbe oneof the reasons but if the engine got that hot the heads are most likely cracked.
ALSO THE ENGINE COULD HAVE BEEN RUNNING WITH OUT AN AIR FILTER FOR A WHILE.
Sorry about the caps.
You'll get more help than just me in a little while.
Frank
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luvrbus
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« Reply #2 on: October 07, 2012, 08:29:09 AM »

Yep heat will do it every time I doubt the heads are cracked the later 8v92 castings will stand a lot more heat you should be fine just watch the temp,for water in the oil if that happens shut it down or it will cost you a crank and a line bore then it gets real expensive like 4 grand for a new DD crank

good luck
« Last Edit: October 07, 2012, 05:53:03 PM by luvrbus » Logged

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TomC
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« Reply #3 on: October 07, 2012, 09:01:41 AM »

Cylinder scoring can also be caused by running 15W-40 for long periods of time-especially in hot summer months.  I don't have the link, but there are pictures of comparing cylinder liners run on 15W-40 and with straight 40 weight.  The difference is dramatic, and after seeing that, you'll always run 40 weight.  Yes, military runs their 2 stroke engines on 15W-40, but they also only have a 2000 hour requirement before overhaul-which on a military vehicle is about 60-80,000 miles.  Then they just pull the engine and install a fresh one-on our tax dollar. 

When I ran the 8V-92TA in my truck, I had it overhauled for the first time at 500,000mi.  They said I could have lightly honed the cylinders, installed new rings and be down the road.  But I had the newer designed liners, pistons and rings installed and my oil consumption went from 1,200 miles per gallon to 2,200 miles per gallon burned (my engine never leaked).  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
akroyaleagle
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« Reply #4 on: October 07, 2012, 05:46:04 PM »

Clifford, would 4000 grand be 4 million?

Couldn't resist!

Joe
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Joe Laird
'78 Eagle
Huron, South Dakota
luvrbus
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« Reply #5 on: October 07, 2012, 05:54:08 PM »

3 extra o's huh Joe lol
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Geoff
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« Reply #6 on: October 07, 2012, 06:32:26 PM »

There are too many varibles and not enough information.  Call me at 928 771-0045 and tell me what happened.

--Geoff
General Diesel Service
Prescott, AZ
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Geoff
'82 RTS AZ
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