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#1
12-08-2005, 01:48 PM
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617 Engine Rebuild/Build-up
i'm currently in college, my major is automotive mechanics. i'm taking and engine recondishioning class this coming semester. I have a non-working 81 300D that a friend was going to buy off me and make work. but that deal has fell throught. i was thinking of pulling the engine and rebuilding it for my 84 300SD. the question is, what diffrences are there between the engines. the turbo is odvous, but is there internal diffrences to the engine? would i be able to build a long block and then bolt on the turbo and all other accesories?
if the engine is useable what should i do to it? any spacific problem areas that are easly fixable with the engine in peices? how expencive is an engine kit? where can i get an engine kit? any advice that you guys can offer would be great. i don't have a ton of money, but the calss has a great machine shot that i'll have full access to, so if there is any machine work that would usuly be out of the question due to price, i'll have an opertunity to atempt it. i'm also intrested in any preformance upgrades that i might be able to install on/in the engine... i'd like to hear your ideas of a dream engine and then i can work down from there. thanks Nik 
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#2
12-08-2005, 01:57 PM
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If you have access to a machine shop why don't you try this:
http://seriestrek.com/index.html Your dream diesel converstion Danny
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination
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#3
12-08-2005, 02:10 PM
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Big differences between the turbo and n/a engines. First of all, the turbocharged engine has an oil gallery with oil squirters that spray lube oil onto the undersides of the piston crowns. The gallery doesn't exist on the n/a block...other things such as nitrided bearing surfaces on the crank and cam are less obvious but are there nontheless.
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Never a dull moment at Berry Hill Farm.
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#4
12-08-2005, 06:55 PM
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in fact there is not
very much that is the same on the turbo and non turbo motor. bigger crank nose and harmonic balancer, double fan pulley, ribbed oil pan, pistons, valves (i think), oil pump, and of course al lthe turbo stuff.
best to rebuild the non turbo motor as a non turbo. or trade it for a turbo motor and rebuild that. good luck tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#5
12-08-2005, 08:57 PM
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A na 617 in a W126 would be a dog, thats why MB only put turbo charged engines in the S.
Personaly I'd talk to out Finnish friends. Maybe lower compression pistons with a monster turbo to pump some serious boost into it! 
__________________
2016 Corvette Stingray 2LT 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#6
12-08-2005, 10:38 PM
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As a 10 year mb indie tech I can tell you that I've never seen anyone come out ahead on a mercedes engine rebuild. Almost always cheaper to simply replace an engine . That being due mostly in part to the high prices of mercedes engine parts. If you've got machine work and labor covered you've got an edge that could make it feasible.
You should pull the engine from the 300D, rebuild it, and stick it back the 300D.  It would be an awesome learning experience for you. You could then take what you learned and apply it to a custom engine build for your SD.
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