crank pully for installing A/C

[n/a]

 :?: Hello I am in the early stages of installing an A/C in my 66 230 sl
I have acquired most of the pieces necessary but i am missing the crank pully with the additional belt slot.
if anyone can help me locate one it would sure save the day.
thanks in advance. :?:  :?:

Jerry P.

[n/a]

Bud's Benz has new ones in stock for about $80.

[pkiefert]

FYI, I believe someone on Yahoo had opined that the 4 main bearing 230 motor did not have sufficient strength on the front of the crankshaft for the additional load of A/C

[ja17]

Good point Phil,
 These early six cylinder engines with the three bolt pulley attachment were more suseptable to problems. A crankshaft pulley/vibration dampner assembly which comes loose can ruin the crankshaft. I know many of these engines with AC which never had problems and I know some that did. It is most critical that everything be correctly assembled on the M127 (230-SL) engine when installing the multiple crank pulley. Be sure to correctly torque the crankshaft bolt and the three pulley bolts. The correct strength hardware should be used. The factory shop manual reccomends using some thread locking compound (Locktite or such). Modifications and upgrades to the fastening hardware and re-assembly in detail is covered in section 03-10/1 to 03-10/4 of the Workshop Manual "Passenger Cars Starting August 1959" This section covers vibration dampners and counterweights on six cylinder models from 220 b to 250-SL. It looks like there is an improved crankshaft "strech bolt" and washers which can be used to prevent problems. I can scan the information for you if you do not have it.


Joe Alexander
Blacklick, Ohio

[Naj ✝︎]

Jerry,
One other mod was that 3 big cupped washers were used on the main balance weight bolt instead of only one. You may already have these on as my '65 230sl had them on when I had a look.


naj
'Kloines Scheisserle'
65 230SL
68 280SL

[ja17]

Hello George Des,
I am bring9ing this topic to the front page so you can review the information. Maybe Jerry can update us on his progress also.

Joe Alexander
Blacklick, Ohio

[Benz Dr.]

New what? Surely not a crankshaft for 80 bucks.

  In all fairness some break and some don't. I suppose proper instalation over the past 40 years makes a big difference. The 220SEb uses the same crank and I've seen a number of them break or come loose so it's not an isolated problem.
On the other hand I've never seen the 250 or 280 fly apart like that so I guess the new style crank and screw with cupped washers did the trick.

I'd inspect the end of the crank carefully and use the new style parts if they fit. I say that bcause I've not done that and don't know for sure.

Dan c

Daniel G Caron