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Old 09-14-2018, 08:59 PM
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Join Date: Aug 2017
Location: South NJ
Posts: 56
M104.98x Stuck Coolant Drain Plug

I made some progress with my M104.98x top end rebuild.
Today I took care of all the components from the bottom of the car. All went fine up to the point where I tried to drain the coolant from the block. Using a 19mm socket and a 13” long 3/8 ratchet I tried to loosen it but it is froozen, I sprayed some kroil and it started to move (very very hard) I worked it out 1/2 turn when it got completely froozen again, antifreeze drops came out.. I tightened agin as I didn’t want to risk it. I’ve done a few M104s overhauls but I never encountered a drain plug that stuck..
Did anyone experience something similar?

Last edited by ytech15; 09-14-2018 at 09:15 PM.
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Old 09-14-2018, 09:07 PM
Registered User
Join Date: Jan 2012
Posts: 6,489
The drain on my SL only rotates a turn or so. Drained coolant and closed it again.

I need to pull the engine for a head gasket and refresh so I'll address it then. Will probably have to heat or drill it out. ( the drain is just like a brake bleeder )

Given you are pulling the engine, work the drain back and forth to break rust. Just forcing it can break the drain.
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Old 09-23-2018, 06:56 AM
oldsinner111's Avatar
love all animals
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,215
mine broke off,I just remove bottom hose to drain.Hope to buy one soon,as trans cooler can rot in the stock ones.
veteran,mother german,born in stuttgart,shoot a racist for Isis
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Old 09-23-2018, 08:18 AM
optimusprime's Avatar
Trevor Hadlington
Join Date: May 2014
Location: Worcestershire in England
Posts: 1,171
Turn the drain tap anti clockwise a little., poke the hole in the centre it may be full of rust and dont remove it .
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