March 9, 2008
Some people expressed interest in my other car, a ’71 280S (W108) that has gotten a OM617 and five-speed manual transplanted into. Here’s a few relevant pictures, they are not of the best quality but it’s quite hard to take decent pictures down in the engine compartment.
I bought the car this way, and haven’t done the conversion myself.
First, a overview
Close-up of the engine, two pictures. This is a OM617.910 (“240D 3.0”, NA), that was installed in W115 75-76-models. It has a more rounded intake manifold, as seen, and the oil filter housing is located differently than later OM617’s. Note that original air filter housing has been used, and radiator/oil cooler are also original.
Passenger side engine mounting arm, this is probably the W115-arm that was included with the engine. The rubber piece is very similar to those in W123, maybe it’s from one.
Drivers side, appears also be the arm from W115, and rubber from god knows where.
Two interior shots, one of the shifter (from a W123?) and one of the gorilla knob.
Some of the pictures hints quite a lot of rust. Yes there are rust on visible spots, but the whole underbody is very clean and newly welded where needed. Also the interior is horrible, it’s missing pieces and seats are torn, I’m going to get a whole interior from a spare parts car and swap that in, whenever time permits.
December 4, 2007
Long time no posting, here’s an update.
In late July I got Franz almost cleared by the Swedish vehicle inspection. Almost – meaning they DID object that it did run on diesel as opposed to gasoline, as stated in the title. But this bought me a month of legal driving (regulations says it’s legal to drive one month from a failed inspection) which I of course took advantage of, to the fullest extent. I did a trip to northern Sweden with two friends, all in all this took two weeks and we drove about 4000km (6400 miles).
4000km of test-driving of course provides some very valuable information about Franzes health.
Front brake caliper stuck after about 200km. Manually hacked loose parts from the pads to clear the disc. Of course the caliper stuck again and again and again, and every time I took off the wheel, hacked away some more parts of the pads. This was seriously not fun and sunk my confidence in Franz.
Maximum speed is about 90km/h (56mph) and comfortable cruising is at about 70km/h. This is due to too high rear-end differential gearing. While not a problem for me, some other drivers, notably the five big rigs, a stretch of campers and mobile homes did object when they finally got to pass us after tailing for miles and miles on a curvy, single-lane road up north. At least judging from their quite sour faces.
Since it obviously is no rocket, it has quite modest fuel consumption. About 8L/100km (30mpg).
Worse is, that it seems Franz has a oil drinking habit, it consumes about 1L/1000km.
The cardan shaft vibrates a bit at speeds above 50km/h, but after 2000km you really get used to it.
I did learn the following
Apart from these minor issues the trip went well. Sweden is a very beautiful country, the sun was shining most of the time and we played some serious rockn’n’roll with the Becker.
Up north in Sweden
How to perform brake caliper overhaul with almost no tools, no shop, no nothing. No there wasn’t even electricity at the location. Hand tools are manly.
After we got home from the trip in late August, I haven’t done much more than fixing the stuck caliper. I was a bit discouraged by the fact that the engine drinks so much oil, that indicates for me it’s quite seriously worn inside and not very suitable for a vegetable oil conversion. But since all the hard work is done now, I am looking (although not that actively) for another engine to throw in. I have no real plan for Franz right now, but some things I’d like to do is (in order of importance)
Get him re-titles as a diesel car at the vehicle inspection
Take a compression test to determine how bad the engine is
Swap rear-axle from my donor 280SE
Do the vegetable oil-conversion
It’s december now and I have a quite busy schedule, so propably I’ll begin working on Franz sometime in january.
July 14, 2007
Had trouble finding the recommended product, Liqui-Moly Diesel Purge, so I went with what’s available. A can of Wynn’s Diesel Clean-Up.
Ran the can through the engine and got out some nasty stuff.. Yeow!
Here’s what I bought..
After some idling and running ’round on that can here’s what came out of the fuel return. Plain nasty.
What the primary filter contained.. replaced both primary and secondary filter while I was at it..
Will run some biocide through the engine too, some says the blackness is algae. You now, plants growing in my engine. Won’t allow that, now will we?
June 7, 2007
So Franz finally got some fresh air and sun.
Last thursday the time had come to test drive Franz a bit to see how things are working out.
Below is the video of Franzes first run, ever!
Immediately noticed that loud clicking sound coming from underneath (that’s why I look so worried), I checked it out on friday and it turned to be a loose bolt on the cardan shaft mounting at the flex plate. That’s wrenched tight now and everything seems to be running fine.
Test drove once more again and Franz merrily speeds up to 50km/h and the tranny is shifting smooth as silk (went up to third). Maybe that quick and dirty vacuum job really does work?? 🙂 Didn’t want to run faster due to limited space at the site, the cardan shaft is still only temporarily welded together and the brakes definitively needs some working.
Also noticed a small dripping oil leak from a line going to the oil pressure gauge, think I fixed it now.
Current status is that Franz is once again standing on four steel legs, took the cardan shaft off to get it to a professional machine shop for welding and balancing. Been doing some interior work now. Hooked up a radio (although no speakers yet), lubricated all the wires from dash to the heater (levers hardly moved before) and began polishing up the chromework. Some fun-to-do smaller jobs, I really need them now as relaxation from the pulling engines / wrenching cardans-type of jobs.
Here’s a picture of the interior, if you’ve ever been in a fintail you’ll notice this is not particulary different. Not a show car but nothing is cracked or broken, could be polished a bit to a nice shine. New carpets and more, could make a difference!
May 20, 2007
This involved some welding. Had two different trays, none which would fit inside the narrow space between chassis and intake manifold, so I made my own. It fits very nicely, all done by scrap iron found on the property. The battery is a brand new 80Ah el cheapo battery.
Here’s the space before
Please note this is the sport edition of battery trays, as you can see no excess weight exists in this tray with all the holes in it.
Installed in car
With battery in place
Bonus: clearance test video with hood installed
May 20, 2007
Here’s a real ghetto-tech approach to the vacuum system.
A day spent at a pull-a-part resulted in a bucketfull of vacuum hoses, connectors and orifices. Nice start for a couple lousy bucks spent!
Got a great drawing from this forum post, it’s the first drawing. I haven’t a slightes clue what parts 1 & 2 on the drawing are but nevermind, it’s all connected together and there’s no loose ends. Expect a follow-up on vacuum troubleshooting 🙂
Here’s a picture of the result. The big black roll of hose with the aluminium block is a shutoff valve, I eventually did install it inside the car.
May 20, 2007
Got myself an oil cooler! A friend has a for-parts-W108 sitting in his barn, he said go ahead an pick whatever you want so I did.. His oil cooler now sits in the front of my car (that is, after cleaning it, picking out two spiders and giving it a light coat of black paint). Also got myself some hydraulic hoses (again from AMAB Hydraul as were the earlier ones) to connect the cooler to the oil filter.
Here’s the result.