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Car Forum / Mercedes-Benz Cars / July 2007M180 with a single row timing chain, why double row?
Hi, I've just gotten myself a M180 engine but it has a single row timing chain, while another M180 I have has a double row chain. Does anyone know why Mercedes used a single row chain and why a double one? Can I replace the single by a double if I change the sprocket wheels as well? -- Martijn A double row chain is stronger than a single chain and therefore less likely to break. The 3.8L V-8s of the early '80s had single chains but these motors had the space so double chains could be retrofitted - and usually were. I cite that old V-8 because I don't know what a M-180 is.  Signature© 2007 T.G.Lambach. Publication in any form requires prior written permission. > A double row chain is stronger than a single chain and therefore less > likely to break. The 3.8L V-8s of the early '80s had single chains but > these motors had the space so double chains could be retrofitted - and > usually were. I cite that old V-8 because I don't know what a M-180 is. The M180 is a 6 cylinder inline engine, around 1970, for example in the W114 and so on. But, would it break easily? Under what conditions? Should I replace it by a double chain? -- Martijn Most owners don't want their pistons smashing into their valves when the chain breaks. Why do you think new motors have double chains when a single chain will do? Signature© 2007 T.G.Lambach. Publication in any form requires prior written permission. -->> T.G. Lambach <<-- schrieb: > Most owners don't want their pistons smashing into their valves when the > chain breaks. > > Why do you think new motors have double chains when a single chain will do? The 230.6 1968 had a single chain. I bought it with 160000 km and the first hard ride on the autobahn broke the chain at 175 km/h. The reason was the tensioner, someone had blocked it with high tension to have a smooth motor noise like a sewing machine. Since valves were straight upright in this inline 6 with one camshaft only and valve levers were made of forged steal it was enough to replace the deformed lever the valve in one cylinder and the chain. That lever and valve are still a scuplture on my desk. That hit on the crankshaft bearing of that piston then cracked the motor sometime later. The engines with double camshafts had inclined valves and a broken chain meant to make crap of the motor. They got a double chain and the MB service recommended to replace it before 200000 km to avoid even rare events of desaster. SignatureRoland Franzius Only 8 postwar models used a single row chain: http://articles.mbz.org/engine/gas/chains/? They were not particularly wonderful. If you can afford to upgrade to double row by all means do so - if the rest of the car is worth keeping. SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net > Only 8 postwar models used a single row chain: > > http://articles.mbz.org/engine/gas/chains/? > > They were not particularly wonderful. If you can afford to upgrade > to double row by all means do so - if the rest of the car is worth keeping. I only have the engine, but I do have plenty of spare parts from other M180 engines (M180.928). Would I be able to use those parts to replace the chain. In this particular setup, I will not go 175 Km/h, only about 90 max, but I will use it in a heavier vehicle. -- Martijn >> Only 8 postwar models used a single row chain: >> [quoted text clipped - 8 lines] > >Would I be able to use those parts to replace the chain. I don't know for sure. If you have a dealershi p with a decnet parts guy he can probably give you he list of parts and from that you should be able to figrue out what ones you already have. SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net > >> Only 8 postwar models used a single row chain: > >> [quoted text clipped - 12 lines] > guy he can probably give you he list of parts and from that you should > be able to figrue out what ones you already have. Well some parts are the same (eg: intermediate shaft from oilpump etc), but others seem to have slightly different numbers but have been replaced by ones that look alike. I think that the bushings are the same but haven't put them next to one another yet. Might give it a go, there seems to be space enough for it. -- Martijn |
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