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#1
10-12-2006, 12:02 PM
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how to measure piston protrusion?
Does anyone have specific info on measuring piston protrusion?
I'm trying to figure out if a 603.971 has a rod problem. The #1 piston seems to sit at an angle relative to the other pistons. The piston protrudes seemingly normally on the intake side but much less so the exhaust side. Should I set a level across the piston and measure protrusion at several points? If so should all points be within the single spec? Which way does a 3.5 rod typically bend when it collapses? Does any protrusion less than spec indicate a bent rod? Thanks, Sixto 93 300SD 
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#2
10-12-2006, 12:26 PM
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not sure about the protrusion, but if you have a bent rod, it will be obvious- use any other one, typically #2 or 3 dont bend so crank it around with one of those up, it should stick out slightly higher then the deck. your bent one will be noticibly below deck level.
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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#3
10-12-2006, 12:50 PM
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This should help ... 0.74MM would be the min spec & as shown measure at both front & back
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#4
10-12-2006, 01:31 PM
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are those values the same for a 603? unless I'm reading it wrong, that document excludes that model.
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1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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#5
10-12-2006, 02:47 PM
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only exclusion is for the 602.98_ engines..that is correct for all other 601/602/603 engines. They just worded it badly.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#6
10-12-2006, 04:23 PM
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on second look, i see what you mean.
__________________
1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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#7
10-12-2006, 04:41 PM
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I don't have a dial gauge but I have the 603.971 beside a 603.961 and the protrusion of the 603.961 leaves no doubt. Consequently it's clear that the #1 rod of the 603.971 is bent forward. Dang! That's some sweet torque I'll be giving up
 Thanks, Sixto 93 300SD
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#8
10-12-2006, 09:00 PM
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what do you mean? you going to put it back together without that piston?
just kidding. but really, what do you mean? tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#10
10-12-2006, 10:55 PM
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aha!
good idea! tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#11
10-15-2006, 10:19 AM
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If the bores and pistons were good in the 3.5,
You could destroke the engine with the 3.0 liter crank and rods. Then you'd have a 3.3 liter. But, I'm guessing if you've got a bent rod, then the block would need sleeving and new pistons($$$$). On a good note, the 3.5 liters heads are the later style. IE more crack resistent than the oringinal 3.0l. Michael
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Michael McGuire 83 300d 01 vw A4 TDI 66 Chevy Corsa 68 GMC V6 w/oD 86 300E
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