What did you do with/to your 124 today? - Page 377 - Mercedes-Benz Forum
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post #3761 of 4321 (permalink) Old 05-18-2016, 11:32 PM
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Oil change, engine mounts and alternator swap... finally. 70a -> 150a








I have 14.4v at idle and 14.2v at idle with every possible electric load switched on including 30a electric cooling fan in place of the viscous clutch. The old 70a alternator would drop to around 13.3-13.5v with a similar load at idle.

All the oil is from my front crank seal leak. I'll need to address that soon.
Does the alternator swap require a wiring upgrade? I don't think I would need 150 amps, but it would be nice to get at least 90. I sometimes see 90 amp units supposedly from Japan on eBay and have been wondering about them and what would be involved.
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post #3762 of 4321 (permalink) Old 05-18-2016, 11:44 PM
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Does the alternator swap require a wiring upgrade? I don't think I would need 150 amps, but it would be nice to get at least 90. I sometimes see 90 amp units supposedly from Japan on eBay and have been wondering about them and what would be involved.
Yes it does require a wiring upgrade. I added a 6' long 4awg cable between the alternator and battery in parallel to the 2 existing 10awg (I think) wires that the car already had. It's just barely visible coiled up at the bottom of the 3rd pic.

The 150a alternator outputs 90a at idle and 150a by 1500rpm. With a large alternator like this an overrunning pulley is also recommended.
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post #3763 of 4321 (permalink) Old 05-18-2016, 11:51 PM
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Yes it does require a wiring upgrade. I added a 6' long 4awg cable between the alternator and battery in parallel to the 2 existing 10awg (I think) wires that the car already had. It's just barely visible coiled up at the bottom of the 3rd pic.

The 150a alternator outputs 90a at idle and 150a by 1500rpm. With a large alternator like this an overrunning pulley is also recommended.
Cool, thanks!
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post #3764 of 4321 (permalink) Old 05-19-2016, 12:44 AM
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What did you do with/to your 124 today?

Oh bloody hell, washed the engine bay on my 320CE before consulting with internet and the result - it runs on 4-5 cylinders. I was careful with the pressure washer but bolts on coil cover are not threading, so 5 out 6 where loose and so was the cover. Not hard for the water to get in there. Yesterday pulled the plugs 4 times and suddenly it was ok, toke it for drive and after 8 miles, the problem was back. So the coils and wires are now at home drying. Hope that would fixed it
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post #3765 of 4321 (permalink) Old 05-19-2016, 11:01 AM
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Changed the valve cover gasket. Very easy to do. Decided to do a video along the way.

https://youtu.be/9rnLc854924
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post #3766 of 4321 (permalink) Old 05-19-2016, 11:19 AM
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Luckily drying the coils inside did the job with contact cleaner. Went to a small local car meet to celebrate my luck
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post #3767 of 4321 (permalink) Old 05-19-2016, 07:12 PM
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With the help of a friend, we swapped out the rear hatch struts. It really wasn't that bad of a job using the various writeups and the help of a friend. Dropping the headliner trim is probably the worst part.

No more heavy tailgate dropping on my head or back.
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post #3768 of 4321 (permalink) Old 05-20-2016, 03:08 AM
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With the help of a friend, we swapped out the rear hatch struts. It really wasn't that bad of a job using the various writeups and the help of a friend. Dropping the headliner trim is probably the worst part.

No more heavy tailgate dropping on my head or back.
Thankfully that job was done on my wagon just before I bought it. Even after three years it will still nearly kick you in the face when you open the hatch.
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post #3769 of 4321 (permalink) Old 05-20-2016, 10:39 AM
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It was 2 days ago actually, but I pulled the injectors, tested them using Mercedessource kit, cleaned them and found 4/6 to be good to reuse.

Ordered up the 2 new ones, plus the plastic seats, and the o rings, and the rubber seals.

Looking forward to seeing how it runs afterwards, as they basilly fell out, and #1 was very bad where the whole platic holder just fell out with it.

Actually #1 -3 just fell out with the plastic holders. #4 is a pain to get out, screwing all day with a 90 degree allen head, crows foot no good there.

Hoping this cures my rough running engine - compression is good, plugs/wires/cap/rotor/coil I just replaced. Motor mnts replaced. It doesnt smoke.
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post #3770 of 4321 (permalink) Old 05-20-2016, 03:31 PM
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Drove mine to work the past two days. I'm beginning to suspect I may have a vacuum leak somewhere since the engine seems to be idling higher lately when I come to a red light.
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