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| Detroit Diesel inline 71 Series model... |
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Message |
    
Jimmy Graves
Member
Username: jimg4652
Post Number: 14
Registered: 11-2008
| | Posted on Thursday, November 27, 2008 - 10:46 am: | 
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I have seen a few threads started asking what that persons particular model number means. I dug through some service manuals at work and found model number break-downs for 53, in-line 71, V-92, and 149 Series engines. This break down is for the inline 71 Series engine only.
All rotations are found with you standing in front of the engine, looking at the crank pulley. If the pulley rotates counter-clockwise, it's a left-hand rotation. If it turns clockwise, it's right-hand.
Bank determination (Left bank, Right Bank) and accessory placement (blower, exh. mani) is with you standing at the back of the engine looking at the flywheel. I know in-lines have no "left bank, right bank" but I will use those words to describe which side the blower or exhaust mani. mount.
First digit in the model number determines what Series your engine is. 1000-0000
5 = 53 Series
1 = In-line 71 Series
8 = V-92 Series
9 = 149 Series
0230-0000: 2nd and 3rd digit determine how many cylinders the engine has.
02 = 2 cylinders
03 = 3 cylinders
04 = 4 cylinders
06 = 6 cylinders
08 = 8 cylinders
12 = 12 cylinders
16 = 16 cylinders
0004-0000: 4th digit determines "Application Designation"
2 = Marine
3 = Industrial
4 = Power-Base
5 = Generator
7 = Vehicle
8 = Vehicle
0000-5000: 5th digit determines the "Basic Engine Arrangement and Rotation"
1 = Engine is left-hand rotation, blower is mounted on the "left bank", exhaust manifold is mounted on the "right bank"
2 = LH rotation, blower and exhaust manifold both mounted on the "left bank"
3 = LH rotation, blower mounted on "right bank" exhaust manifold mounted on "left bank"
4 = LH rotation, blower and exhaust manifold both mounted on "right bank"
5 = Right Hand rotation, blower on "left bank", exhaust manifold on "right bank"
6 = RH rotation, blower and exhaust manifold both mounted on "left bank"
7 = RH rotation, blower on "right bank" exhaust manifold mounted on "left bank"
8 = RH rotation, blower and exhaust manifold both mounted on "right bank"
0000-0600: 6th digit determines the "Design Variation"
0 = 4 valve cylinder head ("N" Engine)
1 = 2 valve cylinder head
2 = 4 Valve cylinder head ("E" Engine)
3 = Turbocharged engine
5 = Customer Spec. Engine
7 = Constant Horsepower
0000-0078: 7th and 8th digits are the specific model number.
Remember, the model number on your block determines the way your engine came from the FACTORY. Anything could have changed by others who have rebuilt your engine. |
DENIS K
Member
Username: denis_k
Post Number: 12
Registered: 10-2008
| | Posted on Friday, November 28, 2008 - 09:24 am: |
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Jimmy my 671 has this stamped on the block 6a256017
ra6055m
do you know how to brake fitst 4 down |
Jimmy Graves
Member
Username: jimg4652
Post Number: 17
Registered: 11-2008
| | Posted on Friday, November 28, 2008 - 11:35 am: |
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Serial number 6a256017: 6A is the Suffix for 6-71, all 6-71's will have "6A" as the first two digits.
According to my Field Service Data book, serial number 248936 started in 1972, and serial number 272037 started in 1973. So your serial number of 256017 means your engine was built in 1972.
As far as your ra6055m number, to be honest, I have no idea. I will try to look it up in the Service Manual at work on Monday and see if I can find anything on it. |
DENIS K
Member
Username: denis_k
Post Number: 13
Registered: 10-2008
| | Posted on Friday, November 28, 2008 - 04:07 pm: |
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Thank you for your help Jimmy. |
Bud Condrey
New member
Username: wcondrey
Post Number: 1
Registered: 10-2009
| | Posted on Monday, October 05, 2009 - 07:53 pm: |
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I have a 6 71 and don't know the model. The boat was built in 1961. It says Gray Marine and from old paper work, the s/n is 67178342. I want to get the correct manual for it. I have a few manuals but don't know which one to use. From researching this, the s/n I have may not be correct. Where can I find mod and s/n on this engine so I can get the correct manual? |
Jimmy Graves
Member
Username: jimg4652
Post Number: 42
Registered: 11-2008
| | Posted on Tuesday, October 06, 2009 - 08:24 pm: |
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Model and Serial number should be stamped on the block right behind the governor.
On the old Gray Marine engines, the s/n usually did start with "671" like yours, so you probably have the correct number. I don't have the literature available to give me any more information though, so I apologize.
I think they didn't start using the "6A" prefix on the s/n's until the late 60's - early 70's. |
Bud Condrey
New member
Username: wcondrey
Post Number: 3
Registered: 10-2009
| | Posted on Tuesday, October 06, 2009 - 08:40 pm: |
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Jimmy.......
Thank you so much. I will look and see what I can find. Do I need to get the correct Model # in order to get the manual? Or can I get a manual from the serial number? Thanks again for your help, Bud |
Jimmy Graves
Member
Username: jimg4652
Post Number: 43
Registered: 11-2008
| | Posted on Thursday, October 08, 2009 - 08:57 pm: |
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You should just need the serial number. The correct manual should cover all models of your engine. |
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