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-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 10-03-2003, 04:41 PM
Judge's Avatar
Registered User
Join Date: Sep 2003
Location: San Francisco Area
Posts: 124
Is it normal that fan rotates freely (300D Turbo 82)

This may be too basic to ask, and shows that I've only had the car for a week, but

Is it normal that the main fan (mechanical) rotates freely in a 300D turbo when the car is parked??

Last edited by Judge; 10-03-2003 at 11:53 PM.
Reply With Quote
Old 10-03-2003, 04:59 PM
Registered User
Join Date: Oct 2001
Location: Canada
Posts: 298
Normal, because thermal clutch is not engaged.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.
Reply With Quote
Old 10-03-2003, 11:53 PM
Judge's Avatar
Registered User
Join Date: Sep 2003
Location: San Francisco Area
Posts: 124
Instead of finding more broken things I 'm happy to find something works some complex way because of good enginering.

Thanks for the good news.
Reply With Quote
Old 10-04-2003, 10:38 AM
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
It should rotate, but not what I'd call "freely". The fan is bolted to a pretty big fan "clutch" that is in turn rotated by a fan belt.

The fan clutch is supposed to allow some slippage when the engine is at normal temperature, and then start "locking up" when the engine gets hotter.

So, on your car, you should see approximately the following behavior. Grab the fan carefully and give it a good spin attempt, being careful not to cut yourself or bend a blade. Just a reasonable spin, not excessive or anything. The fan should stop within one turn or less.

If it just spins freely then your fan clutch has gone bad and will never lock up when your car needs it the most.

Not a cheap part either. But its something you can probably do without over the winter in a cool climate.


1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
Reply With Quote


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 03:55 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page