'70 280SL
03-25-2016, 10:23 AM
#1
Senior Member
SuperBike
Thread Starter
Join Date: Sep 2010
Location: Bisbee, AZ
Posts: 1,873
'70 280SL
For a friend of my sister-in law (not actually, but this simplifies the
relation) I took on the task of a full service on a 1970 Mercedes 280SL.
After re-torquing the head I got ready to adjust the valves. Checked the fit of a 17mm crows foot (Mercedes has at least 3 factory tools to do the adjust, photo 5) on the ball pin adjuster. Fit was very sloppy. Crows foot measured ~17.15mm. Info from the web warns against rounding off the hex adjuster. Yeah, no ****! Removing the rocker arm looks to be a PITA! That's what has to happen it the adjuster get ****'ed. A 16mm crows foot of course won't fit. So I got out a file and opened up the 16mm to about 16.85mm. This produced a snug fit the required a light tap with the ratchet handle to fully engage the hex adjuster. As the engine was still warm I only tried the valves that were in position and the modified tool worked fine. Breaking the near frozen adjuster loose with a loud snap. After that the adjuster moved freely and over the minimum spec'd torque. Today I'll finish up with the adjustment and button up. Then on to the rest.
relation) I took on the task of a full service on a 1970 Mercedes 280SL.
After re-torquing the head I got ready to adjust the valves. Checked the fit of a 17mm crows foot (Mercedes has at least 3 factory tools to do the adjust, photo 5) on the ball pin adjuster. Fit was very sloppy. Crows foot measured ~17.15mm. Info from the web warns against rounding off the hex adjuster. Yeah, no ****! Removing the rocker arm looks to be a PITA! That's what has to happen it the adjuster get ****'ed. A 16mm crows foot of course won't fit. So I got out a file and opened up the 16mm to about 16.85mm. This produced a snug fit the required a light tap with the ratchet handle to fully engage the hex adjuster. As the engine was still warm I only tried the valves that were in position and the modified tool worked fine. Breaking the near frozen adjuster loose with a loud snap. After that the adjuster moved freely and over the minimum spec'd torque. Today I'll finish up with the adjustment and button up. Then on to the rest.
03-25-2016, 03:40 PM
#2
Rex Kramer-Thrill Seeker
SuperBike
Join Date: Jan 2011
Location: Brookfield, WI
Posts: 2,312
Sometimes you have to modify your tools to get the job done. I have a half dozen tools that I modified or built from scratch, because I didn't want to pay the price for the actual tool.
I really like those 280SL's. Never had the opportunity to own one or even work on one. Looks to be fun!
I really like those 280SL's. Never had the opportunity to own one or even work on one. Looks to be fun!
03-30-2016, 08:20 AM
#6
Senior Member
SuperBike
Thread Starter
Join Date: Sep 2010
Location: Bisbee, AZ
Posts: 1,873
When the car was then new I remember thinking how cool they looked. While this car is in very good condition for a 40 year old vehicle, it is 40 years old. The design/engineering is even older.
It still is very secure feeling while driving. Still taught and relatively rattle free. It is built solid. Overbuilt might describe it better.
The lack of a fifth speed is noticeable at higher speeds. Maybe the auto trans was better. The motor certainly has more than enough torque to handle a tall (overdrive) gearing.
If it were mine I would sell it. Values for these are over a wide range, $7000-$50k. Not sure who would pay that much, but... That would get you a nice car and a couple motos with change left over.
It still is very secure feeling while driving. Still taught and relatively rattle free. It is built solid. Overbuilt might describe it better.
The lack of a fifth speed is noticeable at higher speeds. Maybe the auto trans was better. The motor certainly has more than enough torque to handle a tall (overdrive) gearing.
If it were mine I would sell it. Values for these are over a wide range, $7000-$50k. Not sure who would pay that much, but... That would get you a nice car and a couple motos with change left over.
