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#1
03-09-2010, 11:11 PM
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crankshaft issue with 1978 300cd- please advise!
here's what my mechanic informed me of:
The cars problem is: The vibration damper and the belt pulley are bolted to the crankshaft hub with six small bolts. The crankshaft hub is bolted to the engine with one large center bolt. It is this large bolt that worked its way loose causing the crankshaft hub to break away from its woodruff keys and cease turning the fan belts while the engine was running. The end of the crankshaft wore down preventing a proper fit of a replacement crankshaft hub. The proper repair is to remove the crankshaft to have it repaired or replaced. Very expensive. he thinks i should sell the thing for parts. wondering about other opinions. 
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#2
03-09-2010, 11:23 PM
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it can be repaired. replacement engine is a better way to go.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
03-10-2010, 12:24 AM
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Search here. There are at least a couple of thread describing the drilling of new holes on the balancer and crank for the pins. One within the last six months I think. It doesn't have woodruff keys, it has round pins. cutting slots for woodruff keys would be more difficult.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#4
03-10-2010, 12:25 AM
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If you like the car, just replace the engine. You could even go with a swap out for a turbo set up, but IIRC, you would need the tranny as well.
Good coupes are getting hard to find. If you part it, or sell it to the mechanic, what do you think he would do? He might replace the engine and drive it, or even sell it.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#5
03-10-2010, 05:23 AM
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I'd look for a donor car with cosmetic body issues and a strong motor for 500 to 1000 and swap the motor over.
Replacing the crank is also an option. These hb failures are usually the result of someone who doesn't know what they are doing damaging the pins while installing the hb. Did this mechanic work on the hb earlier?
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#6
03-10-2010, 11:29 AM
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I'd say find a good used crankshaft and just replace it. This would require removing the engine, flipping it over, and removing the pan and crankshaft. You would not need to mess with the upper part of the engine, and parts would include the crankshaft, new bearings and new seals (and balancer of course).
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#7
03-10-2010, 11:38 AM
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I got a NA crank that you can get from me. PM me if interested.
.
__________________
1983 123.133 California - GreaseCar Veg System 
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#8
03-10-2010, 11:59 AM
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How is the rest of the car? Theres probably no way around your problem that doesn't involve major surgery. To me if the cars not rusty and its been well kept, the engine is worth replacing for sure. Swapping in a crank isn't that big of a deal as far as "major" projects go. Can you do the work yourself?
__________________
 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#9
03-10-2010, 12:33 PM
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Quote:
Tell you what: send me a pic of the vehicle, I'll buy it from you for 250.00 and I'll tow it away--to my garage for about a week in my spare time.  This is NOT an engine breaker by any means.
__________________
Strelnik Invest in America: Buy a Congressman! 1950 170SD 1951 Citroen 11BN 1953 Citroen 11BNF limo 1953 220a project 1959 180D 1960 190D 1960 Borgward Isabella TS 2dr 1983 240D daily driver 1983 380SL 1990 350SDL daily driver alt 3 x Citroen DS21M, down from 5 3 x Citroen 2CV, down from 6
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