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#1
12-20-2018, 01:08 PM
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OM617 balancing
I'm almost to the reassembly portion of my OM617 rebuild and about to start balancing my pistons. 4 of them are from the 1985 block and have thinner piston skirts, and one is from an earlier engine and has a thicker skirt.
The weight difference between the old style and new style is ~20 grams. What is an acceptable weight difference on pistons in these engines? Didn't realize I had different pistons until I started cleaning them up. I don't want to have excessive vibration or wear, hopefully I can get enough weight shaved off of the heavier piston without compromising it's structural integrity. Thanks Max
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Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver) Instagram: @maximed93 
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#2
12-20-2018, 01:47 PM
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Information is in the FSM
https://www.startekinfo.com/StarTek/outside/12265/disc_2/program/Engine/617/03-316.pdf
__________________
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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#3
12-20-2018, 04:14 PM
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Thank you, I cannot afford a $60/day access to the Star TekInfo FSM, but I'll try to find another source.
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Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver) Instagram: @maximed93
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#4
12-20-2018, 04:42 PM
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Are any of them from a turbo?
__________________
CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there?
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#5
12-20-2018, 04:44 PM
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They're all from turbo OM617s. That is the engine I am rebuilding, I'd rather not buy any more OM617a pistons if I don't have to.
__________________
Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission (my only daily driver) Instagram: @maximed93
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#6
12-20-2018, 04:47 PM
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https://www.startekinfo.com/StarTek/outside/12265/disc_2/program/Engine/615/03-316.pdf
03-316 Difference in weight between any two pistons in one engine As new: 5 grams tolerance limit: 10 grams
__________________
CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there?
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#8
12-21-2018, 05:58 AM
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The FSMs for the r/c 107, W123 / 4 / 6 are all open and free to use via the links posted above.
To date no fee or log in is necessary (People do have difficulties with getting flash to work but that's a different issue)
__________________
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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#9
12-21-2018, 09:14 AM
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__________________
CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there?
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