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1994 325is fan problems


OP1
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hey guys I have continued problems with this car. I have put 5 fans and radiators in this car. When I drive it hard and the rpms get up there, the fan flexes and hits something and breaks up. The pieces break the radiator. I have replaced the motor mounts, tried both oem and aftermarket fans and still have the same problem. I was told that the water pump may be bad and since the fan connects to it and causes the fan to wobble at high rpms that this may be the problem. Any help would be appreciated. Thanks in advance.

OP1

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Are you using the stock fan and shroud?

What type of engine mounts are you putting back in? Are they new?

Are the transmission mounts also new? Bad tranny mounts will allow the engine to move, too.

If the water pump is moving, you should feel the wobble when you attempt to move it by hand.

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Hey Peter,

Thanks for the reply. I have both stock fan & shrowd. Motor mounts are new stock dealer mounts. Have not checked tranny mounts but new clutches were put in about 2 yrs ago and no mention of bad mounts. As for the water pump wobble, should I grab the clutch on the fan and wiggle it to see if there is any play. Should there be some play at all?

Thanks again Peter.

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Rather than reiterate what is on another forum, I'll post links. Bimmerforums Track/Autox section usually has the answer:

The forum:

http://forums.bimmerforums.com/forum/forumdisplay.php?f=128

 

One answer:

http://forums.bimmerforums.com/forum/showthread.php?t=1418940&highlight=broken+fan

 

more:

http://forums.bimmerforums.com/forum/showthread.php?t=827421&highlight=broken+fan

 

more:

http://forums.bimmerforums.com/forum/showthread.php?t=565367&highlight=broken+fan

 

If this is a track car, I would pull the mechanical fan and install an electric fan (assuming it is legal with your ruleset).

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If this is a track car, I would pull the mechanical fan and install an electric fan (assuming it is legal with your ruleset).

 

 

If it is a track car, you need to swap out the motor and trans mounts ASAP to harder compounds. I usually recomment the Vorshlag units, as linked here:

 

http://www.vorshlag.com/index.php?cPath=1_4_26&osCsid=be34e05e1a797352a1a5227e383caa43

 

More likely than not, you are getting significant roll in the drivetrain while on track. This is going to create wear throughout the vehicle as it was not designed to accomodate this type of use.

 

Additionally, not ungrading these components is a really easy way to increase your risk of the infamous "money shift."

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....

 

There's not much that can move a fan except engine/tranny mounts and a bad waterpump. Unless your radiator is the one that moves! You shouldn't need other than OEM mounts even if you are tracking the car. However, if you are using R-comps then probably a pretty good idea. And what Mr. MacAvoy said, that "money shift" is easier to get to with OEM mounts (though it also needs a willing driver ).

 

Please tell us what you find to be the problem.

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Thanks for the tips. I agree that not much else beside water pump, tranny mounts and motor mounts. It is not a track car.....yet, but who knows. Thanks again guys.

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