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Volvo overdrive splice into a Mercedes Diesel
In the CHINA BLUE sold thread, whunter suggested splicing a volvo overdrive unit into a W123 4spd manual driveline. Anyone ever do such a thing?
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CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there? |
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It's a J type overdrive, meaning it was originally bolted to the back of some other transmission. From what I've read they grenade in reverse, and work fine in the forward gears. Activated by an electric solenoid.
No idea what models/years though EDIT: Here you go: http://gtsixing.blogspot.com/2012/01/overdrive-modification_13.html
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You are going to have to get a mainshaft that is longer by the width of the Laycock unit. Is that going to be easy or cheap?
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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 (??) |
#5
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A driveshaft shop should be able to shorten/lengthen anything you need for around $300
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
#6
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^^ transmission mainshaft
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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 (??) |
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I'm interested in this too...
...but I've been wondering about actually doing it in reality - the biggest problem I see is how you would fit an over drive onto the rear casing of another transmission. The lengthening of the output shaft shouldn't be too difficult - but looking at the Haynes manual (yes yes I know it is crap) section on the manual transmission it looks like the clearances for the rest of the gearbox come off the back cover. {Much like the rear end of the 722.1 automatic transmissions - get that nut on the output shaft wrong / position of the back end of the gear box wrong and everything else will be out of whack; gearbox not last long with bits in wrong place}
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits! |
#8
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Quote:
Trans->DS->OD->DS->Diff
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
#9
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the biggest question for me is room. the most amount of space available in the tunnel is immediately after the transmission, which is also where the shift linkage bars are, and would the overdrive hit them is my question. How big around is this item? would you have to enlargen the tunnel?
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#10
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Quote:
Quote:
Still think it's spendy. Parts can't be very available when the OD goes bang. An adapter plate with a domestic 5 speed is probably best long term.
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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 (??) |
#11
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Volvo started using external overdrive units in the 1960s. They were used on some
-122 (Amazon), -1800/1800es, - 142, - 240, and - 740/760 (Turbo only) series cars. The overdrive was activated by a column stalk on the 1960s to early 70s cars. On the 240 series and 740 it was switched to a button on the shifter. It could only be activated when the car was in fourth. My 142 was a low-spec model and didn't have it, so I can't say if there was any provision for it to auto-disengage when shifted out of forward gear on the 60s and early 70s cars. However, the later 240/740 had a dummy switch that automatically disengaged the OD if the car was shifted out of 4th with the OD still engaged. I am not sure if Volvo owners of the era exactly loved the system, but the old pushrod B18/B20, and to a lesser extent the later OHC B21/B23 four-cylinder engines sounded really agricultural at highway speeds, without the OD in operation....
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Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22 |
#12
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thoughts
Quote:
So to install an OD like this on those, you cut the outer tube, remove a section of the tube equal to the length of the OD unit, install flanges on the tube halves that bolt up to the OD unit, cut and spline the inside driveshaft to fit the unit on each end. The OD unit replaces a portion of the torque tube and carries the driveshaft torque. I once owned an MGB that had a 4-speed manual with a similar electric Laycock OD, and this was bolted to the back of the trans, and then an open driveshaft from there to the diff. In the Mercedes, seems like you'd have to somehow attach the unit to the trans and perhaps eliminate the center bearing (maybe come out of the OD unit with a u-joint?). If you did a divorced (trans-ds-od-ds-diff) setup, you you need to seal both ends of the unit and affix it in an appropriate way to the undercarriage, as it would be carrying torque. Just some thoughts ... a very interesting idea. -Dan
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1976 w115 300D 4-speed conversion!! 1985 w123 300TD 4-speed conversion!! Non-Mercedes old stuff: 1941 Buick Special (Straight 8!) 1946 Luscombe 8a 1947 Willys CJ2a 1950 Chevrolet 4400 dump truck 1954 Chevrolet 3600 3/4 ton 1954 Cessna 195B 1955 John Deere model 40 1991 Ford Taurus SHO 2013 Jetta SportWagen TDI 6-speed (I sold out... |
#13
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My Volvo has the Manual with the Overdrive. Is there any way to use the complete Transmission (a Saginaw Transmission).
Also somewhere inside is a Pump to circulate the ATF used as a lubricant.
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84 300D, 82 Volvo 244Gl Diesel |
#14
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I agree. A taller rear diff can give the cruising RPMs we all want as well.
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
#15
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It seems like I am not the first who thought about the volvo overdrive to a W123.
My plan is to use it after a 722.118 4-speed auto gearbox, 240D engine. My ideas and some arrangements: 1. Bought a Volvo trans with an overdrive (waiting for delivery) 2. I will cut the tunnel from a wreck to have a test bench. 3. Found a company that will sell me the end cap of the OD - red part - (it will be a separated and sealed unit, not sharing oil with the trans) also a shaft - blue part - with the 3 screw yoke connection to the MB trans through a flexdisc, another yoke on the OD output to connect the shortened propshaft. 4. According to my measurements, the OD will fit in the tunnel, I think the biggest problem is the transmission linkage.(dimension B????) Here are some pictures and dimensions: |
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