Re: [MBZ] '77 240D alternator belt adjustment woes
I do have another question. While rolling around under the car, I found a part attached to the cross member just behind the oil pan. In the middle of this cross member is a stud/bolt that faces the oil pan. Right now, it has bare threads at one end. Is there supposed to be a nut on it? What is it holding? Isn't that for some kind of front engine mount? -- Jim ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '77 240D alternator belt adjustment woes
After hours of fiddling with the alt, I was able to get the third bolt loose, the one inboard from the toothed adjuster bolt at the top. It actually comes in from the front like the other two with a nut on the backside. Once I was able to get it loose enough to allow the bracket to move with the adjuster, I was able to set the belt tension and get it right. Initially, I thought that the adjuster was maxed out, so I bought a shorter belt. I ended up going back to the original once I was able to get the adjuster working as it should. I'll never be stumped by a W123 alternator again!!! I do have another question. While rolling around under the car, I found a part attached to the cross member just behind the oil pan. In the middle of this cross member is a stud/bolt that faces the oil pan. Right now, it has bare threads at one end. Is there supposed to be a nut on it? What is it holding? Kevin in Hillsboro, Oregon 1977 240D 315Kmi, Liesel the Diesel ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '77 240D alternator belt adjustment woes
Oh, and as I recall the toothed bolt can get out of sync on the rack and not have full travel. (It only has teeth partially around it.) So make sure the teeth can engage the full length of the travel on the rack. -- Jim ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '77 240D alternator belt adjustment woes
I can't move it by hand to get any tightness on the belt. You don't, you use a box-end wrench on the toothed bolt head. Set the belt tension that way, hold it in place with the one wrench while you tighten the nut on the back with another wrench. Don't move the toothed head any while doing this. Then secure the other two bolts. -- Jim ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '77 240D alternator belt adjustment woes
Well, therein lies the problem. I only "see" two bolts, the "toothy" one at the top and a pivot bolt at the bottom, both currently loose. Where would the third bolt be? I went out and took a close look at the Frankenheap. There are three bolts. The toothed one, the pivot bolt at the bottom, and the bolt that holds the toothed rack to the engine block. All three are long. A very important part is the spacer that goes on the back side of the toothed bolt, so that when the nut is tightened down the bracket is pinched to the spacer, thence to the alternator, and thence to the toothy end of the bracket. If the spacer is gone it'll never tighten up right, and will work loose. -- Jim ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '77 240D alternator belt adjustment woes
Should be one that makes the pivot, the toothy adjuster and a third on the backside (bolt head to the firewall) that actually provides the resistance to movement. On my '78 I only need to loosen the tension bolt, tighten the toothy adjuster and retighten the tension bolt. 2 second process. Needs a 13mm and 17mm but I forget which is for which. -Curt Date: Wed, 7 Mar 2012 21:30:55 -0800 From: "Kevin Kraly" To: "Mercedes Discussion List" Subject: Re: [MBZ] '77 240D alternator belt adjustment woes Message-ID: <0DA3ABAA403EA7AD7CC8C77DE8A3@KDogHP> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Well, therein lies the problem. I only "see" two bolts, the "toothy" one at the top and a pivot bolt at the bottom, both currently loose. Where would the third bolt be? Does it come in from the front with a nut on the backside like the other two? It's been a while since I've dealt with one of these on my first '78 300D whose toothy bolt wasn't up to the task either. On this 240D with the two afore mentioned bolts loose, the alt will move 1/4" or a little more back and forth. I can't move it by hand to get any tightness on the belt. Kevin in Hillsboro, Oregon 1977 240D 315Kmi, Liesel the Diesel ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '77 240D alternator belt adjustment woes
Well, therein lies the problem. I only "see" two bolts, the "toothy" one at the top and a pivot bolt at the bottom, both currently loose. Where would the third bolt be? Does it come in from the front with a nut on the backside like the other two? It's been a while since I've dealt with one of these on my first '78 300D whose toothy bolt wasn't up to the task either. On this 240D with the two afore mentioned bolts loose, the alt will move 1/4" or a little more back and forth. I can't move it by hand to get any tightness on the belt. Kevin in Hillsboro, Oregon 1977 240D 315Kmi, Liesel the Diesel ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] '77 240D alternator belt adjustment woes
I fought with the thing for nearly 3 hours with no success! I got the bolts loose, tried to move the adjustor bolt with the teeth that slide the bracket to tighten it, but can’t figure out the proper technique to get it tighter. It seems looser ow! What am I doing wrong? Is there a proper way to move the adjustor? What are you, blind? :-) Here's what works for me: loosen all three bolts/nuts, put a box wrench on the toothy bolt and twist to tighten. While holding it in place then tighten the nut on the other end of the bolt, _without_ moving the toothy bolt head at all. Then tighten the other two bolts/nuts. This assumes your toothed bolt has enough travel left to attain a proper tightness, and that the teeth aren't damaged. If you don't have three tightenable bolts it won't stay tight. -- Jim ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
