need help w115 - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 07-14-2007, 03:23 PM Thread Starter
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need help w115

i recently got my diesel 240d w115 to start but only by pushing it and dropping the clutch will it start i got a new battery with 850amps 1000cca, can it be the starter motor or to weak of a battery?

W208 2002 CLK 430
05 E320 CDI
previous MB: W126, W115, W124
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post #2 of 8 (permalink) Old 07-14-2007, 06:56 PM
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If you have a new battery, I'd suspect the starter, myself...

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post #3 of 8 (permalink) Old 07-15-2007, 01:38 AM
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Does the starter crank at all?

1977 - W116 - 6.9
1974 - W115 - 240D /8 - 4(M) OM617.910 + Turbo + 300D FW - Completed 7/8/10
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post #4 of 8 (permalink) Old 07-15-2007, 09:15 AM
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Lets confirm by fail to start does it turn over but will not run or it does not turn over or very slowly. Any way a multi-meter can be used to check for available voltage at batt should be 12.7 on fully charged batt .Anything over 12 volts should turn it over though.Then check for a voltge drop at starter (this checks cable). To do this check for voltage@starter hot lead (big wire ) you would not want ot see much more than a .5 volt differential between the two readings you took. By now you can pretty much condemn starter.I have an amp prope so i would test amperage. But you may not so while cranking engine or attempting to crank engine check voltage @batt again anything under say 9 volts since it is a diesel indicates excessive load which means your started has failed. REMEMBER TO WEAR SAFETY GLASS ON THE LAST TEST I HAD A BATT BLOW UP IN MY FACE ONCE NOT MUCH FUN. ALSO TRY TO TAKE ONLY A FEW SECONDS ON THE KEY SWITCH BECAUSE WHEN THE STARTER IS BAD AND DRAWS EXCESSIVE CURRENT IS WHEN A BATTERY WILL GET HOT AND CAN BLOW.HOPE THIS IS HELPFUL DOUG CONYER ASE MASTER AUTOMOBILE TECHNICIAN

Last edited by arthrdgls; 07-15-2007 at 09:18 AM.
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post #5 of 8 (permalink) Old 07-15-2007, 10:01 AM
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Quote:
Originally Posted by Maksiu420
i recently got my diesel 240d w115 to start but only by pushing it and dropping the clutch will it start i got a new battery with 850amps 1000cca, can it be the starter motor or to weak of a battery?
My steps for starter problems:

1 - Swap battery for known good one
2 - Clean cable connections and verify condition of cable
3 - Disconnect solenoid and direct jump starter.

Starts after 1 - battery
Starts after 2 - cables
Starts after 3 - solenoid
No start after 3 - Starter

I once had a fully corroded cable that had corroded just inside the insulation behind the battery clamp and you barely could notice it and I overlooked it. It caused identical symptoms. It would charge, do lights, etc but wouldn't handle the current of a starter.

I hope this helps and to second arthrdgls' motion - Safety glasses are a must!

NCDiesel
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post #6 of 8 (permalink) Old 07-15-2007, 03:13 PM Thread Starter
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thanks for the tips the starter cranks the engine but im assuming its too slow since its not starting

W208 2002 CLK 430
05 E320 CDI
previous MB: W126, W115, W124
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post #7 of 8 (permalink) Old 07-15-2007, 03:17 PM Thread Starter
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Quote:
Originally Posted by arthrdgls
Lets confirm by fail to start does it turn over but will not run or it does not turn over or very slowly. Any way a multi-meter can be used to check for available voltage at batt should be 12.7 on fully charged batt .Anything over 12 volts should turn it over though.Then check for a voltge drop at starter (this checks cable). To do this check for voltage@starter hot lead (big wire ) you would not want ot see much more than a .5 volt differential between the two readings you took. By now you can pretty much condemn starter.I have an amp prope so i would test amperage. But you may not so while cranking engine or attempting to crank engine check voltage @batt again anything under say 9 volts since it is a diesel indicates excessive load which means your started has failed. REMEMBER TO WEAR SAFETY GLASS ON THE LAST TEST I HAD A BATT BLOW UP IN MY FACE ONCE NOT MUCH FUN. ALSO TRY TO TAKE ONLY A FEW SECONDS ON THE KEY SWITCH BECAUSE WHEN THE STARTER IS BAD AND DRAWS EXCESSIVE CURRENT IS WHEN A BATTERY WILL GET HOT AND CAN BLOW.HOPE THIS IS HELPFUL DOUG CONYER ASE MASTER AUTOMOBILE TECHNICIAN
did that battery exploding burn your face? where you wearing glasses i always do

W208 2002 CLK 430
05 E320 CDI
previous MB: W126, W115, W124
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post #8 of 8 (permalink) Old 07-15-2007, 03:20 PM
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Also check glow plugs .

'76 - 300D
'72 - 240D (noddy)
'40 Chev pickup
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