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#1
06-15-2012, 10:03 PM
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Does anyone know ANYTHING about a 603 #15 head?
Yep, I've got a #15 head on my SDL. Apparently they're very rare. Does anyone know anything about them? Just curious...since I've got one.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 77k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
06-15-2012, 11:07 PM
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afaik, all heads built above the 14 have the improved design. the higher the number, the more design changes implemented.
likely the 15 still has straight injectors.
__________________
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 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
06-15-2012, 11:25 PM
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Nobody knows anything about them.
They are an updated version of the #14..........obviously. The details of the update are unknown.
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#4
06-16-2012, 07:58 AM
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It would be nice to know if the 15 addressed the overheating issue....but apparently no one knows (yet).
Quote:
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 77k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#5
06-16-2012, 08:05 AM
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Quote:
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#6
06-16-2012, 08:08 AM
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Quote:
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 77k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#7
06-16-2012, 08:14 AM
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Quote:
While the later heads improved the design with more material in the weaker areas, it's still not cast iron and any thought that it is bulletproof ought to be dispelled. BTW, take a close look at the belt on the SDL. It might be three years old now..........and I would change it on principle. It's a 15 minute job if you're prepared and understand the belt routing.
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#8
06-16-2012, 01:06 AM
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I think the #17 hears were out by 1989 w/ the 3.5L motor.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#9
06-16-2012, 10:23 AM
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The various mods from #14 through to #22 were designed to address problems involving too little material in the head between areas of relative pressure/different fluids. These weak areas tended to have head gasket failures causing coolant to be dumped into the oil pan or vice-versa. The "next exit" problem, as Brian writes, whether caused by a serpentine belt failure or by letting the coolant get low, will not be fixed by any head redesign. Alloy heads cannot survive the kind of overheating that cast iron will shrug off (and it's also possible to overheat a 61x engine, you just have to work a little harder).
Jeremy
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 Last edited by Jeremy5848; 06-16-2012 at 11:45 PM. Reason: Correct spelling error
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#10
06-16-2012, 07:37 PM
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yup. I have 2 617's with cracked heads from driving without coolant I'd guess...
__________________
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 560SL convertible 1987 190D 2.5-5SPEED!!! 1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#11
06-16-2012, 11:49 PM
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A 123 diesel was in my indy's shop late last year with what they finally decided was a cracked head from driving with little or no coolant. The driver simply ignored the gauge as long as the engine kept running. The mechanic said it actually ran fairly well, considering. Last I heard they were shopping for a good used head.
Jeremy
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#12
06-17-2012, 11:00 PM
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I found a 15 in a JY years back, it was on a 3L motor (in an '86) if that tells you anything. Sold that off as I bought a fully refreshed 17 on the board with camshaft, new lifters, new springs, new injectors, etc.
Potentially I may have a few pictures of it still, if anyone cares I will look. I think it had the 'straight' injection still.
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I'm not a doctor, but I'll have a look.  '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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#13
06-23-2013, 09:05 PM
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#15 head info
I bought an intact #15 head as a core to rebuild and replace my cracked #14. It appeared not to have been machined before it got to me. It had the collars with the splines and the newer angled prechambers. It didn't have the coolant passage near the timing chain filled in. The machinist put my old prechambers in this head so I could use my just-rebuilt old-style injectors. He has a long background machining & building Mercedes heads at a dealer, but had not put straight prechambers in a #15+ revised head before. They dropped in fine and the prechamber protrusion into the combustion chamber was within spec, but they all still leaked like crazy, which he says he has seen many times. He says he has addressed the problem before by using some kind of locking sealant on the prechamber mating surfaces and on the locking collar threads.
I haven't looked at all the prechamber leaking threads yet, so I don't know if refinishing the prechamber bore and/or adding a shim to create a better sealing surface is a better solution.
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