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#1
07-27-2013, 07:46 AM
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OM602 Head Gasket Failure: A Few Questions
Having just had my head gasket replaced on my 92 300D at 244,000 miles, I had few questions.
1. Is there any pattern to 602 head gasket failure? i.e. does it tend to happen around/above a certain mileage? 2. What factors other than overheating accelerate failure? Green coolant was used in mine for over 200,000 miles....wondering whether that could be a contributing factor. 3. If a head gasket is replaced correctly, should it last as long as the original? Thanks.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles 06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 70k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
07-27-2013, 02:14 PM
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Per Whunter, head gaskets is routine maintenance. I would like to see that in the FSM before buying in though.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#3
07-27-2013, 05:33 PM
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Use a MLS from an om605 and you wont have failures.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#4
07-27-2013, 09:12 PM
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MLS? My 91 is rolling 262k miles. I havent seen any head gasket issues. I'm told the transmission might make it to 300K before going south... Idk
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#5
07-28-2013, 04:34 AM
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Multi layer steel. The 602/603 are.composite.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#6
07-28-2013, 06:20 PM
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Can you use a 605 gasket on a 602? Does it match up physically speaking?
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#7
07-28-2013, 09:40 PM
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Needs some modification.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#8
07-29-2013, 03:14 PM
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Normal failure item after so much time and milage to be expected. The different metals used in the block and head have much different expansion charactaristics that also may contribute.
Also on this engine the oil pressure passage to the head could have been a little farther from the cylinder bore. Same with the 603 engines.
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#9
07-29-2013, 04:39 PM
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Quote:
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles 06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 70k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#10
07-29-2013, 06:35 PM
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yeah mine failed between #1 and oil gally. My head was damaged from the head gasket compression seal getting pushed into the oil gally groove. I had the head deck where it had a groove in it welded and then the whole head was surfaced, still running strong at 250000.
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2011 e320 cdi (132,000) current 2005 Jeep CRD diesel--2.8L (138,000 miles) wrecked, insurance took 1993 Mercedes benz 300D 2.5 Turbo Frybrid powered. (336,000 miles) wrecked and sold as parts car 1990 Mercedes benz 300D 2.5 Turbo (170,000 miles) wrecked and sold as parts car Check out my Frybrid Vegtable Oil Conversion at http://1990300dfrybridconversion.shutterfly.com/
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#11
07-29-2013, 06:43 PM
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If the head and block surfaces are still flat and have a decent finish remaining. There is no reason a gasket of similar quality or better should not go a similar amount of time and distance.
I still feel it advisable to let the engine cool down and equilise hot spots when coming right off the highway before shutting the engine off. It will do no harm even if not particularily beneficial. Also keeps the lube going to the turbo bearings until the turbo revs drop down.
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