Replacing Expansion Tank Question

e36power · 12-19-2018, 10:55 AM

Need to replace my coolant expansion tank. For those that have done this, what does the grommet do? Just help hold the tank in place? Is it typically damaged when removing the tank? Just trying to determine whether I should order one along with the tank.

dpaul · 12-25-2018, 06:07 PM

It is a part of the system to hold the tank in place. The tank has a pin which inserts into the grommet to keep the bottom of the tank from moving around.

It seems unlikely to me that it would be damaged when the tank removed/replaced. However, it can pop out of the chassis and get lost below the engine, which has happened to me.

12-19-2018, 10:55 AM	#1
e36power Private First Class 43 Rep 175 Posts Drives: E90 335i Join Date: Nov 2010 Location: Atlanta iTrader: (0)	Replacing Expansion Tank Question Need to replace my coolant expansion tank. For those that have done this, what does the grommet do? Just help hold the tank in place? Is it typically damaged when removing the tank? Just trying to determine whether I should order one along with the tank.
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12-25-2018, 06:07 PM	#2
dpaul Lieutenant Colonel 654 Rep 1,893 Posts Drives: 2009 E90 335xi, 2011 E93 M3 Join Date: Dec 2012 Location: Boston iTrader: (3)	It is a part of the system to hold the tank in place. The tank has a pin which inserts into the grommet to keep the bottom of the tank from moving around. It seems unlikely to me that it would be damaged when the tank removed/replaced. However, it can pop out of the chassis and get lost below the engine, which has happened to me.
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