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rebuild a 603.9 or get a used 606
I need advice. I have a 603 out of a 91 350 I was going to rebuild. When I started to tear it down the cylinders a slightly egg shaped. Some say bore, others sleeves. This could turn out $$$$ when I get into this and see what else it needs. A friend told me a 606 would fit and bolt up to the tranny and I could use the mechanical IP off the 603. 606 NA's are easier to come by used than 606 turbos. How much less power would the NA engine give and what else is entailed in the swap? Thanks, this is getting confusing.
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Besides liners, you'll need straight rods, preferably upgraded rods. A Metric Motors short block might be a bargain. Any US spec 606 will bolt up to the tranny but a different tranny might not have optimal shift programming for a 606. No problem with the IP but I'd look for a 606.910 out of a '95 E300 which has mechanical throttle control.
I heard the naturally aspirated 606 overall has comparable power to a 300D 2.5 turbo, if you're familiar with that car. Otherwise, it's rated at about 130hp and needs to rev to make power. Think Honda. That might not be a good match for a heavy car. Not just the power but the drivability of a turbo 606 might be worth a premium of $2000 or so. You might be able to find a diff ratio that works better with your driving profile. Sixto 87 300D Last edited by sixto; 01-09-2014 at 06:48 PM. |
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will the exhaust manifold/turbo bolt up on a 606 engine?
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Hello again, hope you've healed up properly. I have a complete OM603 3.0L that I doubt I'll get around to using before selling all the cars off. I've done the 300SDL to 350SDL swap in 5 cars, and have 2 myself, no issues. In your case, I would use the better improved head off your engine on it since you already have a 3.5L. If you need it, just let me know. Was the connecting rod and piston I sent you straight? It didn't appear bent when I checked it.
I also have a few 3.5L's. One block I'd say is eggshaped as a guess. But the one I sent you the piston and rod from had a premature turbo failure, so I would assume that block is fine. So, with what I have, you could go a couple different directions. Anyway, hope you've been well. Take care.
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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D |
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The 3 litre 603 lower block is the way to go for many reasons. Also once installed it will increase the value of the cars still having the 3.5 in my opinion. At least to potential purchaers that know these cars in the future.
Costwise it is probably as economical as any other option or more so. Nothing is bulletproof but with your later head it probably becomes as close as your going to get. The 3.5 engine should never have been produced as you never know if it is going to hold up or not. Even after a rebuild. You know the 3 litre lower block will with rare exceptions. I too am retired and needing more frequent servicing to stay above ground. Repair of a bulging abdominal artery is the flavor of this month. Just waiting to go in. Last edited by barry12345; 01-10-2014 at 12:28 AM. |
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It's generally unwise to add a turbo to an engine that didn't come with a turbo, particularly if a turbo version is available. If you mean attaching a 603 exhaust manifold to a 606, there is a gross port mismatch:
606 exhaust manifold gasket - 603 exhaust manifold gasket - Sixto 87 300D |
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#9
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It had under 30,000 miles on the replaced head. I'm not certain about the block. Would any tags or stampings on the block indicate whether or not it's a replacement block, or OE to the car? Probably a Sixto question there. I have the block on a engine stand, and can get out there fairly easily to look it over if I know any identifying marks/numbers to look for.
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1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D |
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Quote:
__________________
1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D |
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Quote:
Sixto 87 300D |
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__________________
1987 300SDL #1, 1987 300SDL #2, 1980 240D, 1982 300SD, 1994 S350, 1990 350SDL, 1991 350SD, 1985 300D, 2005 E320CDI Gone, but not forgotten: 1981 300SD, 1982 300SD, 1987 300SDL, 1983 300TD, 1980 300CD, 1981 300SD #2, 1987 300D, 1987 300TDT, 1980 300D |
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