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I'm rebuilding an OM617.951!
Hi guys and girls,
I'm about a year and a half into rebuilding this engine from a 300SD. I've always wanted to rebuild an engine and it would give me great experience. I'm a 25yr old Mechanical Engineer so it's good to have hands on experience. The plan is to finish this engine and swap it into a Jeep Wrangler TJ. I want a super- reliable all terrain car that can burn multiple fuels for adventures! It's been a good learning experience and I hope some pictures will help you guys out. I found this engine on Craigslist for $300. The previous owner said it had 300,000 miles on it, and was low on compression. After deciding to put new rings in it, he stripped one of the head bolts and gave up. It had no manifolds or turbo, but had a few brand new parts and was partially dissasembled. I dove in! I'm using the Haynes Manual and the Most of the Mercedes 0m617 manual that use to be available on w124performance.com Luckily I printed out what I needed :-) EDIT: Manual is available here!:http://www.furi-dorifto.com/tech/MB_w124_Manual/W126/Index/617index.html I'll start from the beginning with pictures. Enjoy! Last edited by navery; 10-03-2013 at 01:21 PM. |
#2
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A re-ocurring theme in this project is stripped bolts. Holy crap. Be prepared to get some splined bolt removers and stripped head sockets.
The stripped head bolt was removed in about 30 minutes by drilling a hole for a splined bolt remover, putting a wrench on it and hammering the top. If all else fails, I resort to a grinder and vice grips. With the exception of the piston rings, cylinders and coolant passages, everything was in remarkable shape for the mileage. I was starting to realize what all the praise is about. I had a machine shop measure my cylinder diameters, they were .0065" over the limit. I ordered 5 new sleeves to go with new rings. All new bearings were put in, even though the existing ones were in good shape. Last edited by navery; 09-19-2013 at 09:13 PM. |
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Don't forget to mark the flywheel before removing it. An impact gun really helped with these 12pt bolts. I had to use a grinder on three of them.
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photo barrage continues..
You can see the Piston Rings are worn to pieces. The carbon soot is baked on to the top. The scratches might have come from removing the pistons. I was a bit impatient on grinding down the ridge on the cylinder sleeves. I should have just taken the crankshaft out first.
The bearing cradles have heat marks, but were really smooth so they aren't much cause for concern. |
#5
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Block Work
The journal surfaces on the crankshaft were beautiful.
Next step was block work. My machine shop charged $422.10 for: Hot Acid Bath cleaning of block, removal and replacement of new cylinder sleeves, boring of cylinders to spec, and "decking" the top of the block. It looked so much better afterwards! |
#6
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Rebuilding gets expensive with these buggers quick tho. thanks for the share.... never opened a 617 in my time... Yet! Keep up the updates!
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Only diesels in this driveway. 2005 E320 CDI 243k Black/Black 2008 Chevy 3500HD Duramax 340k 2004 Chevy 2500HD Duramax 220k |
#7
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Painting the Block and Pistons
I used VHT Engine Paint (from Auto Zone) in a primer and Cast Iron finish for the block. I think it came out pretty well. About 2 coats of each. I saw a cool trick on youtube on masking. Just lightly hammer the edges and it cuts the tape perfectly. Your ears will ring, but it's great.
I bought new piston rings by Goetz. Make sure the engraved "TOP" is facing the right way on these! I wouldn't recommend the Harbor Frieght piston ring expander for this. Spend a little more on one. All my new bearing clearances were good. This is a tedious but necessary task with plastigauge. |
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Yes it can get pricey. I did some estimating before I started. The skills are worth a lot too. An engine rebuild has been a bucket list thing for me.
Heres a photo with the oil pump put back on with its new chain and tensioner. Next pic is the head gasket ready to go. I took the head to a different shop to put in 5 new exhaust valve guides, do a 3 angle valve seat cut, vacuum check, and test my springs. This was $205.15. My exhaust valves are now near the limit of thickness. I believe the sodium makes them softer. That's all the pictures I have for now. I will try to answer your questions but forgive me if it takes a while. |
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I think I see cracks in your head...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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The Haynes manual is like a ten year old waving back an 18 wheel truck - it is well meaning and enthusiastic but at that crucial moment unreliable.
Do not believe the conversions from metric (Nm) to old money until you've checked them. Some of them are wrong. Always check the FSM.
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits! |
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Am I the only one who finds it sad that A he is going through all this work and planning to burn alternative fuels and B is going in a Chrysler product?
Nice thread though.....
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I'm planning to repower a Jeep as my w126 body has declined
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#13
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Welcome to the Forum. Hope to see you around here for a long time.
That is a great job you are doing, and thank you for the detailed pictures and step by step as you are putting her together. Rebuilding a 617 engine gets expensive as you go along, just don`t cut corners and it will last a long time. I just got my 617 Flywheel matched balanced to the auto one, and resurfaced, that was $100. Be sure to use new FW Bolt, they are a one time use. I got them for $5.80 each from our MB dealer in Monterey, Ca. Dealer list is $7.25. www.benzpartswholesale.com Jim is one of the parts guys and has been there over 30yrs and quite helpful. FED EX shipping on those would be $9.60 though, that is a ways from you. Iam about 25 miles from them. I was excited when the Fed-Ex drove up and delivered them and I wasn`t charged the shipping. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
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A 617 rebuild is on my bucket list as well. I have done other engines, but never a 617. Your play-by-play is helpful. Thanks, Rich
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
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Great info, thank you for posting with us.
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1982 300TDT 1991 190D 2022 Metris |
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