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  #1  
Old 11-14-2008, 08:54 PM
jef d's Avatar
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Question 603 motor

if I found a head with the #603 016 14 01 would any one know what year motor this is ?


Last edited by jef d; 11-14-2008 at 09:04 PM.
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Old 11-14-2008, 09:02 PM
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That's a head casting number.

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87 300D
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Old 11-14-2008, 09:06 PM
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'86 to '91?
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Old 11-14-2008, 09:29 PM
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Original equipment on US 86 and 87 6 cyl Diesels. I don't know how long they were available as replacements.

Some say the 350SD and SDL came with -14 heads but the few I've seen or heard of came with -17 heads. AFAIK the 350SD and SDL came with inclined injectors and the -14 casting won't properly seal an inclined prechamber, not one that will also fit a -17 or later head, anyway. Put another way, I've never seen or heard of a -14 casting with inclined injectors.

I'd check the prechambers to be sure. A trained eye can observe the inclination. Otherwise test with an injector. An inclined injector won't thread properly into -14 prechamber and vice versa. I think, and my memory is particularly vague on this, that -14 injectors have coarse threads that end about 1 cm above the nozzle tip whereas inclined injectors have fine threads that go right to the nozzle tip.

Attached image of a 603.96 injector pilfered from FastLane. I have a spare .97 injector in the garage and the threads are different as I described. I found this out trying to do a compression test on my 93 SD and the @#$%&! adapter wouldn't thread into the .97 prechamber.

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603 motor-96.jpg  
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Old 11-14-2008, 09:32 PM
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Now that you've edited the original post, my initial respose sounds stupid

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Old 11-14-2008, 09:45 PM
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The #14 head was only in production in '86/'87, re-designed in '88.

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