Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-10-2007, 07:56 PM
Dan Fernandez
 
Join Date: Jan 2005
Location: Monterey CA
Posts: 188
10 mm fan bolts

Was driving today when I noticed my temp. gauge approaching 120!!. Never happened before (highest ever thus far for me was 100), I pulled over, opened my hood and found my fan and the cover loose ! All but 1 of the four 10 mm bolts must have worked their way out and the fourth was just there-barely hanging on.... I got the car towed home. My question is - should I be careful about the bolts I use to replace these? In other words, what types of metals should I use or avoid? I picked up some up from the hardware store - seem to be the proper size, but I do not want them to shear over time from the force of my cooling fan spinning full bore....

Thank you.
__________________
dannyf
1984 Mercedes 300 SD 214 K miles. Runs on WVO ~ 22 mpg over 8 K on WVO
1997 VW Passat TDI 156 K miles. Uses biodiesel and diesel. ~ 41 mpg
1996 Mercury Villager gasser. ~ 20 mpg
Reply With Quote
  #2  
Old 11-10-2007, 08:22 PM
junqueyardjim's Avatar
Registered User
 
Join Date: Apr 2005
Location: Cicero, Hamilton County, Indiana about 30 miles north of downtown Indianapolis
Posts: 2,572
Well, if you want to be really sure

I would think you could get original equipment bolts from the stealer. Short of that I think you can get a very good bolt from NAPA. I would stay away from the bolts sold at the typical hardware store.
__________________
Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!
Reply With Quote
  #3  
Old 11-10-2007, 09:58 PM
Dan Fernandez
 
Join Date: Jan 2005
Location: Monterey CA
Posts: 188
fan bolts

Thank you, Jim.

I'll look for it in the manual, but does anyone know offhand how tight to make these fan bolts? The fault is probably mine that it came off - I replaced my belts over a year ago and had taken the fan off then. I don't want them to come off of their own accord again... I know of no good way to tighten them to a specified torque - my torque wrench will not fit in the slot by the fan.

Dan
__________________
dannyf
1984 Mercedes 300 SD 214 K miles. Runs on WVO ~ 22 mpg over 8 K on WVO
1997 VW Passat TDI 156 K miles. Uses biodiesel and diesel. ~ 41 mpg
1996 Mercury Villager gasser. ~ 20 mpg
Reply With Quote
  #4  
Old 11-10-2007, 11:23 PM
280EZRider's Avatar
No Dumping
 
Join Date: Jul 2007
Location: Medford, OR
Posts: 1,387
You can definitely get these fan bolts from the dealer. I have even seen them at a couple of online stores. Using a long 10mm box/open-end wrench should allow you to get the bolts as tight as necessary. Remember to let the fan move with the direction of the wrench as you tighten the bolts. As you mentioned, there's not much room there.
Reply With Quote
  #5  
Old 11-11-2007, 12:07 AM
Hawk180's Avatar
Registered User
 
Join Date: Apr 2003
Location: Seattle
Posts: 155
According to specs, those bolts should be torqued to 50-70 inch pounds. That seems a little light. I would probably locktite them as well
__________________
83 W123 240D
76 300D, "Lil Yellow Car"
1978 Cessna 172N 180 HP Mod

"If life ain't fun, I'm not interested"

The important things are those that you learn after you know it all.
Chip Foose

Build a better mousetrap and you will REALLY infuriate corporate america.
Reply With Quote
  #6  
Old 11-11-2007, 09:17 AM
tvpierce's Avatar
Registered User
 
Join Date: Feb 2002
Location: Portland, ME
Posts: 612
Quote:
Originally Posted by Hawk180 View Post
According to specs, those bolts should be torqued to 50-70 inch pounds. That seems a little light. I would probably locktite them as well
I strongly second the use of locktite. Judging by the spec, I would think that any old bolt would work. I'm sure I don't have to do the math for anyone here, but at roughly 5 foot pounds (5 pounds of pressure at one foot from the fastener) even something soft like an aluminum bolt would suffice for strength.

My suggestion: use your hardware store bolts, apply a good bead of locktite to them, and use your box end wrench to tighten them to "good 'n snugg" (that's a technical term used in many engineering manuals). Also, tighten them all as close as you can to equal.

The torque spec on these is not all that critical. There's no gasket, or mating concern, so "close enough" is, well close enough.

Just my 2 cents. After adjusting for inflation, arguably worth that.
__________________
Jeff Pierce

Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
Gravely 8120
Previous Vehicles:
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F
Reply With Quote
  #7  
Old 11-12-2007, 01:30 AM
Dan Fernandez
 
Join Date: Jan 2005
Location: Monterey CA
Posts: 188
fan bolts

Thank you all.
__________________
dannyf
1984 Mercedes 300 SD 214 K miles. Runs on WVO ~ 22 mpg over 8 K on WVO
1997 VW Passat TDI 156 K miles. Uses biodiesel and diesel. ~ 41 mpg
1996 Mercury Villager gasser. ~ 20 mpg
Reply With Quote
  #8  
Old 11-12-2007, 01:37 PM
Registered User
 
Join Date: Jun 1999
Location: Albuquerque, NM USA
Posts: 1,946
FWIW, bolts are NOT described by the size of the wrench used on them.

Rather, they're described by the diameter of the shaft, and typical German bolts requiring 10mm wrench have shaft diameter of 6mm and therefore are M6 bolts, i.e. 6mm bolts.

Now, if you were describing something from Japan, that same M6 bolt could require an 11mm wrench.

The same principle applies to inch-size bolts, too.

True 10mm bolts are almost lug bolt size. Yours, in fact, are 12mm, requiring 17mm wrench.
__________________
Kent Christensen
Albuquerque
'07 GL320CDI, '06 SLK350
Reply With Quote
  #9  
Old 11-12-2007, 01:56 PM
mrhills0146
Guest
 
Posts: n/a
The difficulty with these bolts in particular is NOT the type of bolt, but rather the ability to get them good and tight!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 10:08 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page