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#1
11-18-2014, 02:38 PM
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87 300D OM603 fit into 91 300D?
I have an 87 300D OM603 6 cyl. Have been offered a 91 300D 5 cyl. Can I just swap out the engines? Or is it best to swap engines and trannys together? Big question is the 87 power plant compatible with the 91 tranny?
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#2
11-18-2014, 02:55 PM
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The bellhousings should be the same, but the shift points will probably be different. I don't know how well it would work out.
Even the 3.0 and 3.5 OM603's have different transmission shift points. If you were in a pinch, maybe you could swap valve bodies, but it seems like it would be easier to just swap the engine and trans together if you are determined to do such a swap. Is the 5 cylinder blown? If not, why not just drive it as is? They certainly are not as quick as the 603s but I've driven much slower cars. Plus, I sort of like that 5 cylinder sound.
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#3
11-18-2014, 03:06 PM
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The 5 cylinder is a better engine (better mileage, more dependable). I'd keep that if possible. The 6 cylinder has more power, but the cracking head issue can be a real pain. If your OM603 already has a replacement improved head, then that is less of a concern.
I'd plan on keeping the OM603 motor with its transmission. You will probably also need the radiator and I'm sure some other bits. Front springs and spring pads may also need to be replaced due to heavier engine.
__________________
Respectfully, /s/ M. Dillon '87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted '95 124.131 (E300) "Sapphire", 380k miles '73 Balboa 20 "Sanctification" Charleston SC
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#4
11-18-2014, 07:57 PM
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The 5cyl trans is a .418... MUCH smaller than the .3xx in the 6cyl trans...
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#5
11-19-2014, 12:55 PM
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Thanks for the advice. The free 91 has a scored bore in one of the cylinders created when someone tried to remove the prechamber...the owner told me its getting a lot of blow by and not healing itself...that's why I was asking about the swap out.
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#6
11-19-2014, 02:53 PM
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Whats wrong with the 87?
__________________
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
11-20-2014, 10:35 AM
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the 87 has electronic idle control that the 91 does not... there will be issues I'm sure.
__________________
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 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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