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#1
12-11-2003, 05:26 PM
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Couldn't tow start my '80 300 SD
This post is related to an earlier thread about a newly purchased 300SD. In my quest to get this car running, I attempted to tow start the car a few nights ago. I towed it up to 30-35 mph, but when I put the car in drive, second, or low, the engine would not turn. Is this a sign of a bad transmission, or just a result of the car sitting for over a year? I would say that I towed it a total of 1/2 mile or so, but I could not get the engine to turn using this method.
SteveM. 
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#2
12-11-2003, 06:24 PM
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Many newer automatic transmissions don't have a rear pump which is driven by the driveshaft when being towed. The transmission needs to have hydraulic pressure to engage the clutches for a tow start.
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#3
12-11-2003, 08:36 PM
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Front and rear pump.
I was under the impression that my '80 should have both a front and rear pump. The owner's manual describes a tow starting routine similar to what I tried, and others here have said that it's possible.
Steve.
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#4
12-11-2003, 10:14 PM
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If it's been sitting a long time, the torque converter has probably drained down and some tranny fluid overflowed. Check the tranny fluid, it's probably not overfull now.
You may not be able to tow start with the tranny empty of fluid, at least not right away. Did it drag down when you tried? If so, you may want to add some tranny fluid, it may be a quart or two low, and this may prevent the torque converter spinning the engine. Peter
__________________
1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#5
12-12-2003, 07:26 AM
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Steve,
I brought home a 300sd parts car that hadn't run in years. To complicate matters the ignition keys were lost. These are the steps I used to start it. 1. Remove and replace small fuel filter. 2. Remove large fuel filter, drain and fill with fresh fuel 3. Cut top off 3 liter soda bottle and put in some fresh fuel 4. Run line from bottle to small filter and from overflow to a plastic cup. 5. Pump hand pump to push out all the old fuel. When fresh fuel is pumping into cup move overflow line to bottle. 6. Remove vacuum line that goes to shut off on IP. 7. Connect remote start switch. 8. Jump battery to running car. Cranked well and fired up pretty quickly. I was really impressed. Of course I verified fluids were there and manually turned motor while watching camshaft first. Jerry
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#6
12-12-2003, 10:43 AM
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Try this...
If the car has been sitting for some time you may have cylinder walls that are washed clean of oil which could reduce your compression.
Pull the GPs, shoot a little engine oil or ATF into the holes. I used four squirts from my little oil can with a piece of rubber hose on the tip to feed it into the GP holes. Let it sit overnight. Do it again the next day and replace the gps. Then let it sit for a couple of hours then try starting it. The compression will jump from the oil added to the cylinders and really help to start the combustion process. I did this on my 240 when I got it and it fired up after cranking for about 1 minute. It had sat for almost 5 months without running. Good luck p.s. This is my dislaimer on any warranty express or implied... 
__________________
'99 S420 - Mommies '72 280SE 4.5 - looking to breathe life into it '84 300SD Grey - Sold '85 300SD Silver - Sold '78 Ski Nautique
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