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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-26-2011, 08:13 AM   #1
cla325
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Join Date: Oct 2007
Location: Montreal
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My Ride: 325i - e46
HEAD/HEAD GASKET - e46 325i steptronic (2001)

Hello,
It seems like I have a big problem..... head or head gasket .... I keep loosing antifreeze from inside the engine as 3 different mechanics checked for exterior leaks and couldn't find anything.
On top of everything, I have to add about 500 ml of antifreeze every 500 km as the pressure inside the engine is so high the antifreeze is forced out through expansion tank cap and that is why I have to add about 500 ml per week. A couple months ago, the situation was a little bit better as the pressure inside the cooling system was not as high as is now and I use to add only a 250 ml every few months. Therefore, if there is a head/head gasket crack is minor. Note that there are no white fumes coming out of the exhaust.
The thermostat (OEM) was replaced 2 weeks ago.
I also want to add that in the morning (cold engine) I have no heat inside the cabin for about 4 km or +/- 10 min.

Since the repairs are over $2000, I would like to try do it myself. Do you know where I can find a good DIY? Is it recommended?


Thanks for your help!!!
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Old 11-26-2011, 08:29 AM   #2
cdseven95
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Join Date: Apr 2011
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Quote:
Originally Posted by cla325 View Post
pressure inside the engine is so high the antifreeze is forced out through expansion tank cap and that is why I have to add about 500 ml per week.
cylinder pressure pushing into coolant jacket... Rent a Hydrocarbon tester at autozone for free to be sure..


Quote:
Since the repairs are over $2000, I would like to try do it myself. Do you know where I can find a good DIY? Is it recommended?

Go for it... The car is 10 + years old and a 325... Perfect car to experiment on... Serious... Its one of the more major things you can do but get a service manual and follow it...
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Old 11-26-2011, 09:07 AM   #3
paraklas
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Have you tried replacing the expansion cap first?

Also, you are providing contradicting information, 3 mechanics found no external leaks yet you loose 500ml from the expansion tank cap?
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Last edited by paraklas; 11-26-2011 at 09:09 AM.
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Old 11-26-2011, 10:58 AM   #4
BMWespresso
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http://ezflatscreen.com/carpages/m52headremoval.php
http://forums.bimmerforums.com/forum....php?t=1526184
with the head out have a machine shop re-surface and check the valves, you should actually have the head refurb valve seals and all
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Old 11-26-2011, 11:56 AM   #5
redbull 325is
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Quote:
Originally Posted by cdseven95 View Post
cylinder pressure pushing into coolant jacket... Rent a Hydrocarbon tester at autozone for free to be sure..
Quote:
Originally Posted by paraklas View Post
Have you tried replacing the expansion cap first?
my expansion cap was cracked on my car.. replace yours.

replacing an HG on an m54b25 is very very hard because if the head warped at it will have pulled the threads out of the aluminum block. If i were you rent/buy a hydrocarbon tester:

and also try a compression test as well before going head gasket.

Bonne chance!
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Old 11-28-2011, 06:25 PM   #6
CrazyNoobmodder
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Join Date: Nov 2011
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Hi guys im new to BMW. i bought a car that mite have a possible blown head. can anyone direct me to a link that mite have a DIY? i know if i post a thread ppl will HANG ME. i know they do that g35driver.com LOL.. Im already going to do a compression test..
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