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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Jul-07-2018, 01:13:49 PM   #11
LightlyToasted
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Default Re: Coolant Drain Plug Block Removal Troubles :

Another option, if you can't get the block drain bolt out (or worse, strip it), is to use a vacuum filler. Suck all of the old fluid out, and use the same tool to fill it back up. Amazon has lots of them, and YouTube has videos demonstrating their use. Easy and quick, with the added benefits of not having to disturb any hose fittings and being mess free.

Edit: I was mistaken - the vacuum fillers are for filling, not draining. The procedure I watched a mechanic do was:
  • remove the thermostat from the housing (thermostat would likely not be open and would impede flow)
  • reinstall the housing without the thermostat, leaving hose off
  • pressure flush the system with water draining out of the hose which was attached to the thermostat housing
  • pressure drain with shop air
  • reinstall the thermostat and hose
  • pull a vacuum and check for leaks
  • refill with a vacuum filler

Last edited by LightlyToasted; Sat, Jul-07-2018 at 01:48:02 PM.
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Old Sat, Jul-07-2018, 03:34:40 PM   #12
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Default Re: Coolant Drain Plug Block Removal Troubles :

I'm with the crowd that say's don't kill yourself over it. Use the temp sensor location to get as much out as you can, then just fill it with distilled, run the engine, then drain again. Then, fill with new.
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Old Sat, Jul-07-2018, 04:02:06 PM   #13
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Default Re: Coolant Drain Plug Block Removal Troubles :

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Originally Posted by Exclusivs View Post
If refreshing entirely - why not get all old fluid out possible?
The "why not" largely comes down to it being a huge pain in the ass to access the block drain.

Personally I'd drain it from the radiator, turn on the ignition (not engine) to let the aux pump do its thing and push a little more fluid out, and then call it a day.
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Old Sun, Jul-08-2018, 12:12:08 AM   #14
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Default Re: Coolant Drain Plug Block Removal Troubles :

For those of you saying to skip draining the block There is a lot of coolant in the block itself and simply draining the radiator does not constitute a "coolant flush".

To make it easier you can remove the vanos accumulator bolt and then move the accumulator a bit out of the way. This will give you more room to get a socket w/ extension on the drain plug bolt and then use a large ratchet to give you the leverage needed to break it free. It's a bit messy when you remove the drain plug as it will all gush out so have a large tub underneath to catch it. And don't forget to remove the old crush washer (can either stick to the block or bolt) and replace it with a new crush washer when reinstalling the drain plug.
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Old Sun, Jul-08-2018, 04:01:16 AM   #15
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Default Re: Coolant Drain Plug Block Removal Troubles :

Worst case, support the motor and pull off the VANOS pressure accumulator and bracket.

There's a 10mm pinch bolt that pinches the canister. Remove that, slide the canister up and out. 2 13mm bolts to remove the bracket. Should be easy to get to the drain plug.
The reason why you want to support the motor is the 2 13mm bolts also secure the engine bracket to the block.
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Old Sun, Jul-08-2018, 06:54:52 AM   #16
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Default Re: Coolant Drain Plug Block Removal Troubles :

Appreciate all suggestions! For me draining remainder from block was necessity. Knew amount of coolant in there, and the fill/reflushes as suggested didn't sit right with me either running through a new radiator.

This is JUST from block drain, and that doesn't count the extra that was on the floor. Lots of patience, take your time, and 110% don't skip!





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Old Sun, Jul-08-2018, 02:33:22 PM   #17
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Default Re: Coolant Drain Plug Block Removal Troubles :

I would recommend installing a banjo bolt with a stainless steel line and a plug. Makes life easier and much less messier.


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Old Mon, Jul-09-2018, 04:44:09 PM   #18
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Default Re: Coolant Drain Plug Block Removal Troubles :

Quote:
Originally Posted by bigjae1976 View Post
I would recommend installing a banjo bolt with a stainless steel line and a plug. Makes life easier and much less messier.


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That's a good idea. Do you happen to know the bolt size (pitch, threading and length) so I can order one in advance? Any recommendations?
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Old Mon, Jul-09-2018, 05:23:09 PM   #19
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Default Re: Coolant Drain Plug Block Removal Troubles :

Quote:
Originally Posted by bigjae1976 View Post
I would recommend installing a banjo bolt with a stainless steel line and a plug. Makes life easier and much less messier.


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A line going where? Are you talking about oil or coolant?
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Old Mon, Jul-09-2018, 07:12:33 PM   #20
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Default Re: Coolant Drain Plug Block Removal Troubles :

Quote:
Originally Posted by TboneM3 View Post
A line going where? Are you talking about oil or coolant?
I think it can be short and act as a spout for next time you have to drain the block.

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Discussing Coolant Drain Plug Block Removal Troubles : in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)