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  #1  
Old 07-25-2010, 07:56 PM
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Alternator adjusting bolt

Anyone know were I can find one of the alternator adjusting bolts with gear teeth on it? It's the 17mm one. It's worn out from the previous owners messing with it.
I have adjusted this thing so many times I never want to do it again.

Thanks

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  #2  
Old 07-25-2010, 08:20 PM
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Wrecking yard?

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87 300D
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  #3  
Old 07-25-2010, 10:53 PM
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Try here, click on the buy parts button.
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83 SD

84 CD
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Old 07-25-2010, 11:25 PM
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would one be on a 78 240? I have a parts car to pull stuff from....
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"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
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1987 190D 2.5Turbo
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  #5  
Old 07-26-2010, 12:48 AM
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Quote:
Originally Posted by vstech View Post
would one be on a 78 240? I have a parts car to pull stuff from....
Very likely your parts car would have it... my 79 240D has the gear teeth alternator bolt. I know that they're also available as an aftermarket part; I inquired at our local shop, MBI, and they had one on the shelf they could sell me for $12.

Kurt
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- '79 240D - engine swap complete! Engine broken in! 28-31 mpg! Lovin' the ride!
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Old 07-26-2010, 01:02 AM
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You got a picture of this thing? What year/model of car? I'm not following what you're saying about "gear teeth" on the adjusting bolt.

My 84 300CD has a pivot bolt with a 17mm head, and another bolt through the slotted adjustment bracket with a 17mm head on it. The one through the slotted bracket also has a threaded rod welded to the head that goes to a 13mm adjusting nut that fits into another slot on the bracket - so that adjusting the 13mm nut pulls on the rod to pull bolt and adjust the belt tension. I just did this adjustment yesterday in fact. It was a real PITA, because to even get to it I had to remove the intake snorkel and turbo u-tube.
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1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown
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  #7  
Old 07-26-2010, 02:06 AM
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Sorry guys I keep forgeting to put my car info on my posts as if everyone should just know.

1979 240D... But it's such an early one it might as well be a 78. It's got parts that fit both years on it.

Vstech, I forgot I asked you about that bolt before.
I'm goong to do some checking tommorrow and may get up with you on sending it. Btw what happened to make your 240 a parts car? Rusty? Wrecked?

Thanks
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Old 07-26-2010, 08:49 AM
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Quote:
Originally Posted by rcounts View Post
You got a picture of this thing? What year/model of car? I'm not following what you're saying about "gear teeth" on the adjusting bolt.

My 84 300CD has a pivot bolt with a 17mm head, and another bolt through the slotted adjustment bracket with a 17mm head on it. The one through the slotted bracket also has a threaded rod welded to the head that goes to a 13mm adjusting nut that fits into another slot on the bracket - so that adjusting the 13mm nut pulls on the rod to pull bolt and adjust the belt tension. I just did this adjustment yesterday in fact. It was a real PITA, because to even get to it I had to remove the intake snorkel and turbo u-tube.
Early models had a gear just under the bolt head.
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Alternator adjusting bolt-alt-star-bolt-highlighted.jpg  
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Old 07-26-2010, 08:06 PM
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Quote:
Originally Posted by rcounts View Post
You got a picture of this thing? What year/model of car? I'm not following what you're saying about "gear teeth" on the adjusting bolt.

My 84 300CD has a pivot bolt with a 17mm head, and another bolt through the slotted adjustment bracket with a 17mm head on it. The one through the slotted bracket also has a threaded rod welded to the head that goes to a 13mm adjusting nut that fits into another slot on the bracket - so that adjusting the 13mm nut pulls on the rod to pull bolt and adjust the belt tension. I just did this adjustment yesterday in fact. It was a real PITA, because to even get to it I had to remove the intake snorkel and turbo u-tube.
There should be three 17 mm that need loosened and tightened on the 83-84 timeframe: the lower one lets the alternator pivot, the upper back one lets the bracket pivot and the third closer one adjusts the tension on the belt as the geometry from the other two shifts.

A 17 mm ratcheting box end is good to have. You should be able to get to it just by removing the air-tube to the air filter.

Also, make sure the washers are on the front and back of that bracket. The rear nut on mine was "ground in" to the bracket so much I had to pound the bracket flat and file the burrs and the nut had a wear groove. I saw another one just like that at the junkyard, so I'm guessing a lost rear washer isn't uncommon.

I think some 240's use a similar setup, but the bolt goes rear-to-front and the front-inboard "nut" is actually welded to the bracket.

Note: this is probably NOT what the OP is asking about, but refers to the 90-degree adjuster, not the gear tooth adjuster.
Attached Thumbnails
Alternator adjusting bolt-alternator.jpg   Alternator adjusting bolt-alternator-nut.jpg  
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  #10  
Old 07-26-2010, 10:15 PM
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yeah, I got the parts car for the cam... total total rustbucket. the sheetmetal floors are barney rubble style and the seats are mounted to thin air!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #11  
Old 07-27-2010, 12:19 AM
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Quote:
Originally Posted by Yak View Post
There should be three 17 mm that need loosened and tightened on the 83-84 timeframe: the lower one lets the alternator pivot, the upper back one lets the bracket pivot and the third closer one adjusts the tension on the belt as the geometry from the other two shifts
Hmmn, As far as I can tell, on mine the "upper back one" is actually the nut for the bolt that goes all the way through the alternator housing and the slotted adjusting bracket. The bolt head on the bracket side has a threaded rod (5mm?) welded 90* perpendicular to the side of the bolt head, and it passes through a fork attached to the end of the slotted adjusting bracket - with a 13mm nut on the threaded rod. Turning the nut against the fork in the bracket pulls the rod - sliding the bolt in the slot of the adjusting bracket to tighten the belt. Kind of counfusing to explain, but as far as I can see there are only 2 of the 17mm bolts. That's all I loosened and I was successful at tightening up the belt.

Quote:
Originally Posted by Yak View Post
A 17 mm ratcheting box end is good to have. You should be able to get to it just by removing the air-tube to the air filter...
...Note: this is probably NOT what the OP is asking about, but refers to the 90-degree adjuster, not the gear tooth adjuster.
Yeah a ratcheting 17mm would have helped, and I probably didn't have to take the U-tube off now that I think about it. I took it off to try to get to the front bolt head that has the adjuster rod welded to it from the top. Once I realized that a wrench wouldn't fit on it due to the rod being attached, I ended up loosening the rear nut on that bold from the bottom instead.

And yes I would describe what's on my car "the 90-degree adjuster" vs. the gear tooth adjuster....
__________________
1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown
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  #12  
Old 07-27-2010, 02:22 PM
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On an early 240D I had a while back I found it easier to replace the "adjuster" with a plain bolt and tighten the belt using a bar, stick, fence post, what ever, in back of the alternator
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  #13  
Old 07-27-2010, 03:50 PM
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Answer

Quote:
Originally Posted by zenuff View Post
Anyone know were I can find one of the alternator adjusting bolts with gear teeth on it? It's the 17mm one. It's worn out from the previous owners messing with it.
I have adjusted this thing so many times I never want to do it again.

Thanks
1101500372 alternator Clamping Bolt...geared tension adjuster bolt
http://www.peachparts.com/shopforum/showthread.php?t=184147

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