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#1
02-18-2021, 11:39 AM
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M120 Oil Leaking all over Alternator
I have an M120 engine out of a 1996 SL600. Since this engine is installed on a 107 its difficult to see where its coming from and removal of the alternator requires removal of the front subframe. So I would like to get some ideas of what to look for. Are there any common leaks that would originate from above the alternator. I'm thinking the right valve cover gasket might be it, but its a lot of work for a guess.
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To see my 129 parts for sale visit: John Roncallo 
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#2
02-18-2021, 08:12 PM
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The upper timing cover worm seal, and the timing chain tensioner seal ring.
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 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#3
02-18-2021, 09:58 PM
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Quote:
I understand the M120 timing cover worm seal is like the 103/104. Yes they were a PIA. Tomorrow I will try pulling the alternator for a look. It would be nice if it was a tensioner ring.
__________________
To see my 129 parts for sale visit: John Roncallo
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#4
02-18-2021, 10:42 PM
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The seals are very similar to the 104, but its exponentially more of a PIA. I've got one in the shop now that will probably get done next week.
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90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#5
02-19-2021, 01:14 AM
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You can cut a thin piece of aluminum and place it over the seal and then slide the top timing cover over the seal. Oiled plate between the timing cover and the seal will make the job easy and will ensure that the seal doesn't get pushed in. Then you just slide the plate out
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