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  #1  
Old 01-12-2008, 03:12 PM
Dale 240D
 
Join Date: Mar 2006
Location: Gainesville, Fl
Posts: 84
240D Piston

Hey Kids!
Spent the day disassembling my '83 240D that had bad blowby and low compression in the no. 4 cylinder.
The piston of said num 4 cylinder is a disaster. 2 bad ring lands. Looked like somebody has been in there before and just slapped new rings on an iffy piston.
Anyway...i need a piston. 500 bucks is alot of money for a new one. I was wondering if anyone might have one for sale. OR, know what the compatability is with other engines. I found a '76 240 in the junk yard and a number of 300D s. Does anyone know of interchangeability between various models for this time period? i'd like to know beforehand before spending a lot of time in a junk yard trying to get a piston out.

Thanks,

Dale
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  #2  
Old 01-12-2008, 03:17 PM
TheDon's Avatar
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Join Date: Oct 2005
Location: Windermere,FL
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T walgamuth might have some..IIRC He had some for sale

any of those W123's with black interior(with electric windows)?
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|1983 300D| OM617 239k Miles|Red|"Passion"|
|1982 300D Euro|OM617 NA| Thistle Green|"Granny Smith|
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  #3  
Old 01-12-2008, 03:31 PM
Stevo's Avatar
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Join Date: Apr 2002
Location: NW WA
Posts: 6,278
Quote:
Originally Posted by Dale240D View Post
Hey Kids!
Spent the day disassembling my '83 240D that had bad blowby and low compression in the no. 4 cylinder.
The piston of said num 4 cylinder is a disaster. 2 bad ring lands. Looked like somebody has been in there before and just slapped new rings on an iffy piston.
Anyway...i need a piston. 500 bucks is alot of money for a new one. I was wondering if anyone might have one for sale. OR, know what the compatability is with other engines. I found a '76 240 in the junk yard and a number of 300D s. Does anyone know of interchangeability between various models for this time period? i'd like to know beforehand before spending a lot of time in a junk yard trying to get a piston out.

Thanks,

Dale
Your pistons are the "later" (80-85) ones, which are 90.90mm, early ones (77-80) are 91mm, not much difference.
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #4  
Old 01-12-2008, 04:56 PM
Rebe
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500 dollars for a new piston...It's hard to believe they could be that expensive. What would a new set and sleeve's cost with the ring set.
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  #5  
Old 01-12-2008, 06:28 PM
Stevo's Avatar
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Join Date: Apr 2002
Location: NW WA
Posts: 6,278
[QUOTE=TheDon;1730218]T walgamuth might have some..IIRC He had some for sale

He sold em to me
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #6  
Old 01-12-2008, 08:20 PM
Mustang_man298's Avatar
Man of the fire
 
Join Date: May 2006
Location: Shingletown,Ca
Posts: 941
I have some I pulled from a refurb'd engine that was in my 80, if you can identify the pistons you have, this is what mine are:

On the underside of the piston head is cast: ++ 91V13 M251 MAHLE
On the inside of the skirt is cast an MB star
On top of the piston is stamped: 90.865 with a "0" under it.
Near the deep hollow there is a 6 4 stamped sideways with an arrow symbol in between.
On the opposite side of the hollow is stamped 709 T 112 sideways.

Heres a few pics, I have 3 good ones, I used the bad 4th one to get the underside pic.
Attached Thumbnails
240D Piston-img_1289.jpg   240D Piston-img_1290.jpg  
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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale
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  #7  
Old 01-12-2008, 08:47 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 31,245
I also have three more and four turbo pistons. listed in parts.

Tom W
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Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a Lotus 7 replica autocrosser with a modified K20 Acura engine.
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  #8  
Old 01-13-2008, 07:31 PM
Dale 240D
 
Join Date: Mar 2006
Location: Gainesville, Fl
Posts: 84
#1 piston

I appreciate the response guys, I've gone ahead and cleaned the faces of the pistons off and the one i need to replace(no 4 cylinder) has a large 1 and 90,875 on it. If anyone has one, i'd pay you your price.
After looking at some documentation, i was curious as to why the #1 cylinder seems to have it's own set of specs separate from the other 3 cylinders. The bore is supposed to be a little bigger, even though the piston is suppossed to be the same size. Any ideas as to why this is?
ALSO, need i be concerned that my #1 piston is different for the other three. This is what I have:

#1 large 0 90,865
#2 large 1 90,875
#3 large 1 90,875
#4 large 1 90,875

I'm assuming that just means there is a .010 mm difference for no 1. When i put new sleeves in the block will that cylinder need to be honed differently?

Thanks,

Dale
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  #9  
Old 01-13-2008, 07:36 PM
TheDon's Avatar
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Join Date: Oct 2005
Location: Windermere,FL
Posts: 13,205
Quote:
Originally Posted by Rebe View Post
500 dollars for a new piston...It's hard to believe they could be that expensive. What would a new set and sleeve's cost with the ring set.
$1,000 and up for a set for the 616..
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|1983 300D| OM617 239k Miles|Red|"Passion"|
|1982 300D Euro|OM617 NA| Thistle Green|"Granny Smith|
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  #10  
Old 01-13-2008, 08:32 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 31,245
Quote:
Originally Posted by Dale240D View Post
I appreciate the response guys, I've gone ahead and cleaned the faces of the pistons off and the one i need to replace(no 4 cylinder) has a large 1 and 90,875 on it. If anyone has one, i'd pay you your price.
After looking at some documentation, i was curious as to why the #1 cylinder seems to have it's own set of specs separate from the other 3 cylinders. The bore is supposed to be a little bigger, even though the piston is suppossed to be the same size. Any ideas as to why this is?
ALSO, need i be concerned that my #1 piston is different for the other three. This is what I have:

#1 large 0 90,865
#2 large 1 90,875
#3 large 1 90,875
#4 large 1 90,875

I'm assuming that just means there is a .010 mm difference for no 1. When i put new sleeves in the block will that cylinder need to be honed differently?

Thanks,

Dale
The first cylinder for whatever reason (I suppose it is because of the cam chain gallery, maybe there is less water jacket there) runs hotter and requires a bit more clearance with the piston.

I am pretty sure I have both sizes of pistons for you.

Tom W
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Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a Lotus 7 replica autocrosser with a modified K20 Acura engine.
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  #11  
Old 01-13-2008, 11:41 PM
Registered User
 
Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
Quote:
Originally Posted by TheDon View Post
T walgamuth might have some..IIRC He had some for sale

any of those W123's with black interior(with electric windows)?
are you interested in black interior? I was at the local P N P yesturday,
there is a nice 78 280. I first saw it DEC 31, and it was complete& & nice.
some one got the seats already, but the 4 door panels and arm rests are
still there. I think the dash was almost perfect.

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

http://i30.photobucket.com/albums/c3...ilys/boobs.gif


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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  #12  
Old 01-14-2008, 02:21 PM
Registered User
 
Join Date: Mar 2003
Posts: 379
Quote:
Originally Posted by Dale240D View Post
I found a '76 240 in the junk yard and a number of 300D s. Does anyone know of interchangeability between various models for this time period? i'd like to know beforehand before spending a lot of time in a junk yard trying to get a piston out.

Thanks,

Dale
Need to look for a 08.1078-on om616/617 model ,as there is a change in the piston crown...

http://www.ms-motor-service.com/download/kolben/data/ko_mercedes-benz_WEB.pdf

http://www.motorenteile.mahle.com/eLIZA/app/queryVehicle?cocoon-xmlform-view=QueryVehicleCriteriaView&%2Fcriteria%2Fmanufacturer%2Fvalue=MB+-%3E+MERCEDES-BENZ&%2Fcriteria%2FproductionPeriod%2FminMonth=&%2Fcriteria%2FproductionPeriod%2FminYear=&%2Fcriteria%2Fname%2Fvalue=240d&%2Fcriteria%2FproductionPeriod%2FmaxMonth=&%2Fcriteria%2FproductionPeriod%2FmaxYear=&%2Fcriteria%2Ftype%2Fvalue=&cocoon-action-1a025b7e5a65384f22642c7912254f6f8b142e16%3AQueryVehicleCriteriaView%3AexecQueryVehicle=Start+Search# spa-187831933
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  #13  
Old 04-17-2008, 03:57 PM
Alastair's Avatar
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Join Date: Mar 2002
Location: South Wales U.K.
Posts: 1,064
Quote:
Originally Posted by Dale240D View Post
Hey Kids!
Spent the day disassembling my '83 240D that had bad blowby and low compression in the no. 4 cylinder.
The piston of said num 4 cylinder is a disaster. 2 bad ring lands. Looked like somebody has been in there before and just slapped new rings on an iffy piston.
Anyway...i need a piston. 500 bucks is alot of money for a new one. I was wondering if anyone might have one for sale. OR, know what the compatability is with other engines. I found a '76 240 in the junk yard and a number of 300D s. Does anyone know of interchangeability between various models for this time period? i'd like to know beforehand before spending a lot of time in a junk yard trying to get a piston out.

Thanks,

Dale


Are you still looking for a set of pistons for th 616...?

I recently had a little bad luck-

I bought a low miler 617 from a reputable guy and unfortunately it had been stored badly...

Water had got in and rotted out nos. 3 pot liner badly. Shame because the other cylinders show very little wear, X-hatch pattern still clear all the way round.

Anyway, to cut a long story short, my engine supplier is gonna supply a new set of oversize pistons so I can restore this engine.

I'll therefore have 5 Std. pistons, 4 of which should be near perfect, the fifth with maybe corrosion damage--Not pulled it out yet, so not sure how bad that one is...
The engine before it was removed from the car and stored under a tree in a monsoon had only 75K miles on....

Not sure of the shipping to U.S. from the UK, but it shouldn't be too bad if you still need some--best change all 4, for matching age/type/miles...

Yours for the cost of shipping and a pint!
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http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....

Last edited by Alastair; 04-17-2008 at 04:31 PM. Reason: addition
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  #14  
Old 04-17-2008, 08:04 PM
Stevo's Avatar
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Join Date: Apr 2002
Location: NW WA
Posts: 6,278
There are two different piston sizes for the W123, 240D. They made them a little smaller, .10mm as I remember, starting about 1980. Do you have a manual, Haynes is OK and cheap on eBay, or the online manual.
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1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #15  
Old 04-18-2008, 07:45 AM
Admiral-Third World Fleet
 
Join Date: Feb 2002
Location: Central FL
Posts: 3,068
Quote:
Yours for the cost of shipping and a pint!
Sounds like a friendly offer, but the cost of a pint nowadays at current exchange rates is...ouch!
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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