M130 rebuild - Mercedes-Benz Forum

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post #1 of 19 (permalink) Old 02-05-2009, 06:09 PM Thread Starter
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M130 rebuild

Hello all!

For those of you that don't sneak over to the Unimog forum, I thought I would thow a post in here for some pointers on an M130 build up.

I purchased a nice 2.8L M130 from a '72 250C recently. The enigne was running well and supposedly had only 60k miles on it when I recieved it. I am in the process of tearing it down, clanining it up, and getting her back on the road. Of course, she won't be finding a home in a sedan... But I think you W114 and W108 people out there can still appreciate the engine rebuild. (At least I hope!) I am hoping to garnish ome advise, as I see a few people on the forum have gone thorugh this before.

Click here for the thread in the Mog forum

There is a lot more on the general rebuild and restoration of the Mog... But that will point you to the beginning of the engine disasembly.

Right now, the engine is all apart and getting ready to enter the hot tank. Once clean, we'll assess what needs machining, replacing, etc... I assume MB parts are the best?? Anyone know a better source for bearings and gaskets than the local $tealership??

BTW - I should have a few excess parts when all done if anyone has interest. The dual carbs & manifold, oil pan, oil filter, and a few odds and end will be on the market.

Enjoy the pics, and I am looking forward tro some feedback!
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-Kyle
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post #2 of 19 (permalink) Old 02-06-2009, 06:31 PM
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M130 Rebuild pistons or not?

Are you doing this yourself?
I am doing some motors lately and appreciate what you are doing.
First advice upon teardown,
do not hot tank the motor.
Clean the parts block, crank, bearings, rods, pistons, etc with cleaners (I can recommend)
Then mic / plastigage / inspect the parts.
The biggest decision is pistons or not,
usually the crank is good, and sometimes after checking clearance put the same bearings in.
The bucks will flow to the machine shop if you are not careful.
There are so many tricks to getting this thing correct

Brian O
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post #3 of 19 (permalink) Old 02-06-2009, 06:50 PM Thread Starter
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yes, I am doing the rebuild myself. I guess that is not so common here?

The block is already at the hot tank. Too late. What is the issue with the hot tank?

Crank is good. Main bearings are good. Pistons look good. I am planning on replacing rod bearings, rings, gaskets. Deck is nice and flat. I am taking the head in to be checked over, as that is not my expertise. Maybe a valve job??

I appreciate the pointers!

-Kyle
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post #4 of 19 (permalink) Old 02-06-2009, 08:20 PM
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I've been rebuilding my M180 from my 220Sb and this engine is also used in the Unimog. Here's my thread on major engine work over at Mercedesshop

220S M180 Engine Work - ShopForum

I needed an overbore and new pistons. Look at Cyl 6 and the head.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

http://www.megamanual.com/index.html
http://www.bgsoflex.com/megasquirt.html
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post #5 of 19 (permalink) Old 02-06-2009, 08:22 PM
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I'd be interested in some engine parts. What kind of trouble are you having with the tensioner?

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

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http://www.bgsoflex.com/megasquirt.html
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post #6 of 19 (permalink) Old 02-07-2009, 10:23 AM Thread Starter
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The issue was the idler in the enigne block itself.

PM me for the parts you may have interest in.

Has anyone ever done custom pistons for these things?? I honestly don't think I have ever seen a true flat top piston before!

-Kyle
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post #7 of 19 (permalink) Old 02-07-2009, 10:43 AM Thread Starter
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wbain - Excellent pics and write up! I like it. From the pics of your cyl head, the exhaust ports are different on my M130. Mine are rectangular. I believe they are all the same pattern, but definately a different shape.

bostosh - what was the issue with the hot tank? The pics on wbains write up shows some rusting on the parts. Is this what you are talking about?

-Kyle
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post #8 of 19 (permalink) Old 02-07-2009, 11:18 AM
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Waaaay back when I started I rebuilt several of those a month along with diesels and the like. There isn't a ton of chamber room for creativity with pistons so be careful. Clean the oil pressure galleries with a stiff barrel brush, I still have the set I had 30+ years ago. That engine used to spin main bearings when it lost oil pressure so a real close inspection is in line.
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post #9 of 19 (permalink) Old 02-09-2009, 04:08 PM Thread Starter
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Looking for a camshaft

I am looking for a camshaft from an early 70's 280SL with cam designator "02". I may also need the cam bearing/risers to match if the bearing is larger thn what I currently have.

Anyone know where I may be able to find such a part?? Or better yet... Have one on the shelf in their garage??

-Kyle
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post #10 of 19 (permalink) Old 02-10-2009, 11:35 AM
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Regarding hot tanking, I just don't like to re-paint the block insides, and the caustic can get into oil passages, If there was no "metal" inside the oil pan there will be none inside the block. hot tank is your choice.

bigmellon, I have spare motors and will try to ID the cams / rockers / ball adjusters on them.

Brian O
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