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Author Topic: Right handed turbo 8V71 running left handed NA in a 4106?!?!  (Read 1090 times)
technomadia
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Zephyr - 1961 GM PD-4106-446


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« on: June 19, 2013, 08:43:12 AM »

As you might have seen in the other threads, we are broken down in Billings, MT and are dealing with a potential full overhaul of our engine.

The latest snag - the ESN on out 8V71 is "8VA-258845" and the model number stamped on it is "7087-7340".

According to the techs here and the MTU model decoder (http://2-cycle.mtu-online.com/extras/engine-model-number-decoder) that indicates that we have a right hand turbo 8V71 from 1973.

But...  We've just double confirmed it is installed with left-hand rotation, and no turbo.

This has left the shop guys here at a loss as to how to order parts and how they should configure this engine. They'd normally bring the engine back into spec to match the model number, but they are now not sure what changes might have been made since nothing lines up.

Question: What was the original 8V71 model number used in a 1961 GM-4106?

And -- what gotchas and issues might the shop encounter trying to work on an turbo 8V71 righty that is living life as a naturally aspirated lefty?

I'm trying to stay one step ahead of the shop guys who are also researching this.

Wisdom appreciated.  Feel free to call 408-667-9022 if you have any urgent thoughts.

Cheers,

   - Chris
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Cherie and Chris / www.technomadia.com
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eagle19952
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« Reply #1 on: June 19, 2013, 08:59:07 AM »

The number is assigned to the block....it is universal to lefts or rights.
The shop must know that the info they seek was always added to the engine data (configuration) plate (located in the "slot" on a valve cover) if they are a DD dealer I would assume that they have access to DD and an atypical Data plate could be acquired...the lefts vs rights main differences were posted by Clifford..
the Data tag was an aluminum print anodized tag about 2 1/4" x 10" tag blue background with silver lettering.

PS my recollection may be post your vintage.... Grin
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Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 NA, DDAllison on 24.5's 12kw Kubota.
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luvrbus
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« Reply #2 on: June 19, 2013, 09:05:54 AM »

The model number will do you do good from a original 4106 they had a GM diesel high block engine all the guy need to do is order parts for a non turbo 8v71 all the late model blocks from DD had the space for the after cooler with or without a turbo yours is nothing special the block doesn't care which way the parts inside are turning
« Last Edit: June 19, 2013, 10:38:43 AM by luvrbus » Logged

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bevans6
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« Reply #3 on: June 19, 2013, 09:48:34 AM »

The block model number is just the way it came from the factory in 1973.  It would have been turned into a core and rebuilt before it got to you.  Ignore the model number on the block, it's completely irrelevant now.

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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« Reply #4 on: June 19, 2013, 10:58:34 AM »

I can't believe this thread Chris you need to stop listening us and others on the phone and go forward with a rebuild or exchange it's really not that complicated of a deal if you didn't trust the dealer why tow it there there were other options,the heads should have came off that engine the day it arrived then you would have some idea of what the problem was not 3 days later
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