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View Poll Results: Is it worthwhile making an OM617 non turbo rebuild thread?
No! Not another bloody engine rebuild thread 1 3.33%
I couldn't care less 0 0%
Oh go on then if it makes you happy 9 30.00%
Yes please I've got a non turbo OM617 19 63.33%
What is the point of this poll - do whatever you want 1 3.33%
Voters: 30. You may not vote on this poll

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  #16  
Old 12-03-2010, 05:38 PM
ISO Certified Hard Head
 
Join Date: Feb 2007
Location: Milwaukee, WI
Posts: 200
In particular I'd like to see an approach to measuring cylinder wear that's more technical/accurate
than "the cylinder isn't scored and looks round".

The tolerances would imply the use of a custom bore gage to "get it right". And
measuring taper in a deep hole ain't the easiest thing to do.

So, take lots of pictures, and explain your method! Cylinder fitment is key to good
power, especially on a N/A diesel.

--frankb

Quote:
Originally Posted by DeliveryValve View Post
If your just posting up pictures. Then it's just another pictorial.

But if your going to go through the process i.e. explaining the measurements, how parts are fitted. Then that would be different then the other threads.


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1982 300TD 617.912 <NLA> . 1975 2002 E10-EFI . 1976 914c6 . 1983 MG LMIII <NLA>. 1988 Montero / 616<NLA> . 2001 TLS . 2005 Saab 9-5 Wagon
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  #17  
Old 12-03-2010, 09:49 PM
KAdams4458's Avatar
Mmm! Diesel!
 
Join Date: Apr 2007
Location: Snohomish, WA
Posts: 1,420
Quote:
Originally Posted by franklynb View Post
In particular I'd like to see an approach to measuring cylinder wear that's more technical/accurate
than "the cylinder isn't scored and looks round".

The tolerances would imply the use of a custom bore gage to "get it right". And
measuring taper in a deep hole ain't the easiest thing to do.

So, take lots of pictures, and explain your method! Cylinder fitment is key to good
power, especially on a N/A diesel.

--frankb
Telescoping bore gauge.

My personal feelings on the matter of bore measurement is that it's best left to a machine shop. Why? Well, for one thing, the telescoping bore gauges are prohibitively expensive. Second, it actually takes some practise and skill before one can get repeatable measurements with such gauges. I've tried it with borrowed bore gauges, and still can't do it right. Taking the measurement is almost an art, and if you are inexperienced, it's worth paying the machine shop to check out. Besides, if it all checks out, you can then pay them $10 a hole to hone the bores, and you'll still be money ahead versus buying a hone and trying to do it yourself.
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  #18  
Old 12-03-2010, 10:23 PM
4x4_Welder's Avatar
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Join Date: Dec 2009
Location: Poulsbo, WA
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Quote:
Originally Posted by franklynb View Post
In particular I'd like to see an approach to measuring cylinder wear that's more technical/accurate
than "the cylinder isn't scored and looks round".

The tolerances would imply the use of a custom bore gage to "get it right". And
measuring taper in a deep hole ain't the easiest thing to do.

So, take lots of pictures, and explain your method! Cylinder fitment is key to good
power, especially on a N/A diesel.

--frankb
As mentioned, telescoping bore gauges, AKA T gauge or snap gauge. Set it, pull it out and measure with a micrometer or a good set of calipers.
FWIW, the 617 isn't a deep bore. When I rebuilt my Ford 300-6 (the third or fourth one I've done) I did four measurements per bore- Two 90 degrees apart at the top just below the ridge, and another two 90 degrees apart at the bottom of the wear area. Due to wear, I had to bore it to 4.080" and use .030" oversize pistons for a Ford 360, bumping my compression to 9.8:1, but that's a whole other story. That was a 3.98" stroke vs the 3.5" stroke of the 617, with a taller deck height as well. It was a little easier due to the larger bore, but I've measured out Subaru engines with an 82mm bore vs the 90mm bore of the 617.
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  #19  
Old 12-08-2010, 04:45 AM
Stretch's Avatar
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Join Date: Sep 2009
Location: Somewhere in the Netherlands
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Four more days to vote!

I've just done an engine removal thread here:-

How I took out my 1981 W123 300D (euro) non-turbo engine

From this you can see how in-depth the engine rebuild thread could be. I think engine removal is pretty tedious - I don't want to bore anyone with the rebuild thread if it goes ahead!
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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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  #20  
Old 12-08-2010, 09:47 AM
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Join Date: May 2010
Location: Portland, OR
Posts: 434
Thumbs up

That's an awesome engine removal thread. It is really going to help me when I swap engines in the not-to-distant future. Mucho thanks! With any luck the response to the rebuilt poll will be overwhelmingly positive, and I'll benefit from that as well.

Kurt
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  #21  
Old 12-08-2010, 08:23 PM
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Join Date: Oct 2008
Location: Mt. Airy, NC
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We have a sitting dead 80 300td that needs his heart restarted. I would really appreciate a ridiculously thorough N/A rebuild thread. You would truly be doing us a solid.
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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
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  #22  
Old 12-09-2010, 12:26 AM
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DD MOD, HVAC,MCP,Mac,GMAC
 
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Location: Mount Holly, NC
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... I'm about to start pulling a dead crank from my 85 turbo motor... of course I have to clean my shop first... I AM SO SICK OF STEPPING OVER THE MOTOR...
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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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  #23  
Old 12-09-2010, 02:15 PM
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Posts: 6,104
I think it's a great idea. Please do the rebuild thread.

- Peter.
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Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
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1984 123 200
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  #24  
Old 12-10-2010, 04:24 AM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
I started writing my War and Peace sized engine rebuild thread yesterday - Webmaster please buy some more disc space! Hopefully I'll finish it before Christmas...
__________________
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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  #25  
Old 12-10-2010, 06:02 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
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SAweeeet!
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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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  #26  
Old 12-10-2010, 12:42 PM
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Join Date: Oct 2008
Location: Mt. Airy, NC
Posts: 891
german cylinders flying left and right...cats and dogs living together...MASS HYSTERIA

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg
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