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#1
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noob w/ 722.120 Question, B2 servo ??
greetings everyone!
I am the lucky new owner of a 1980 300sd w116, problem is that I bought it needing trans work, Here is the issue- engine starts and runs fine, but when shifted from park, there is no movement or activity at any rpm. sounds like a B2 servo, BUT there is no reverse either. I have dropped the pan and valvebody and the internals look very healthy. can anyone here help me solve this mystery ? Thanks ! |
#2
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Those transmissions are known for breaking off the ears which drive the front pump. Check to see if you are getting any fluid pressure. Pull one of the coolant lines, run the engine and see if anything pumps out. If nothing does, front pump is not working.
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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 |
#3
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Roger that, from the voice of experience.
The B2 servo issue is more of a 722.3xx weakness. The front pump/TC and the loss of reverse (reverse band adjustment backs out-had that ,too) are classic 722.1xx
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??) |
#4
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thanks guys, this has to be the first time ive gotten a response when using a forum, i like this site already! looks like I will have to source a used trans to swap in, is there anything I can do to prevent this from happening again?
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#5
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Quote:
Swapping in a used front pump and torque converter isn't too hard (once you have wrestled it to the ground). If yours seems clean and has low mileage, there is always that option.
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??) |
#6
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I briefly worked for a shop that would sell the customer a complete rebuild when a 722.1xx came in with the reverse band adjustment backed out....Robert
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Did you just pass my 740 at 200 kmh in a 300SD????? 1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership |
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