Help V12 detroit diesel - TheDieselGarage.com
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post #1 of 31 (permalink) Old 11-25-2007, 03:30 AM Thread Starter
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Lightbulb Help V12 detroit diesel

can anyone tell me how to tell what this thing is and where to get rebuild kit its a v12 detroit motor and I don't know how to identify it, I am going to make a drag peterbuilt or sell it:smoke
email: 68joey@comcast.net
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post #2 of 31 (permalink) Old 11-25-2007, 04:22 AM
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I dont see a pic; but probably a 12V-71 they were put in the heavy duty trucks back in the day. What part of the woods are you located in ?

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post #3 of 31 (permalink) Old 11-26-2007, 05:44 AM
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Pet Peeve - There is no U in Peterbilt. Most likely Brad is right, it is probably a 71 series. They are not cheap to work on.

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post #4 of 31 (permalink) Old 11-26-2007, 07:05 AM
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Detroit Diesel or a Cleavite dealer....they are expencive to rebuild but perportionatly so.....just 6 more cylinder kits that a 6-71 . serial no. should be located on the block just underneath the head toward the rear of the block...should be a tag or a raised stamp.....is the spec card/sticker missing from the valve cover?...that would be the easiest place to find it.
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post #5 of 31 (permalink) Old 01-14-2008, 02:34 AM
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i wouldnt bother with if for anything. my old 425 1693 cat would out run them in the mid 70s.they never had big torque. no pull in the hills. put the fuel to em and they cracked heads.
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post #6 of 31 (permalink) Old 01-14-2008, 04:40 AM
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In some ways they are sort of like a VT-903, not very torquey but they rev pretty high, you have to drive them like you don't like them. I wouldn't necessarily work one as they will eat you out of house and home..but in a restored truck or to tow a race trailer, they attract a lot of attention and you you get to listen to them. They do have a nice sound.

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post #7 of 31 (permalink) Old 01-14-2008, 06:10 AM
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They are good engines, not a lot of torque down low but they can be built well. The problem with racing the 71's were they have poor heat transfer from the dry liner design. However, I raced several of them with very little issues. Those old 71's were tuff old engines. Just beat the PISS outta them and they'll keep chugging along.
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post #8 of 31 (permalink) Old 01-15-2008, 03:36 AM
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Quote:
Originally Posted by kblackav8or
Pet Peeve - There is no U in Peterbilt. Most likely Brad is right, it is probably a 71 series. They are not cheap to work on.
I know when GM owned them they were cheap to rebuild (for a diesel)
I guess thats changed ?

You know you live in a Country run by idiots if....
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and government intrusion, while slothful, lazy behavior
is rewarded with EBT cards, WIC checks, Medicaid and
subsidized housing, and free cell phones.


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1970 International Loadstar DV550
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post #9 of 31 (permalink) Old 01-15-2008, 05:07 AM
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No, they are pretty inexpensive to work on compared to semi-current and current 4 stroke offerings from CAT, Cummins and Detroit. A 12v71 overhaul kit will run you around 4k depending on where you get it. An inframe kit a bit less. I prefer IPD brand parts. IPD has much better quality piston kits and their liners are actually round.

We ran a VERY large fleet of 92 Series (71's before that) until 1.5 years ago and had nothing but issues with Detroit rebuild parts. IPD really came through and our engines started holding up.
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post #10 of 31 (permalink) Old 01-15-2008, 05:13 AM
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Did they ever make a 12V92 truck application? Nice A model by the way. I would like to see more pictures.

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