MBWorld.org Forums

Mercedes Tech Talk Discuss general technical questions and issues about your Mercedes-Benz. Moderated by a certified MB Tech.
Sponsored by:
Sponsored by:

W164, OM642, afraid to hydrolock the engine

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 10-31-2019, 10:45 AM
  #1  
Junior Member
Thread Starter
 
piuric's Avatar
 
Join Date: Jun 2016
Posts: 30
Received 4 Likes on 4 Posts
2009 ML 320 CDI
W164, OM642, afraid to hydrolock the engine



Hi, I am replacing the oil cooler seals on a 2009 ML320 diesel and I forgot to drain the coolant before removing the air intakes.
The result was some coolant migrating to the air intake holes.
I can remove some of the coolant from the intake holes but I am afraid I will not manage to remove 100%.
Is there a risk of hydrolocking the engine if some coolant gets inside the cylinders?
Attached some pictures.
Thank you for helping me.
piuric is offline  
Reply Like
Old 10-31-2019, 12:05 PM
  #2  
Junior Member
 
pgsurface's Avatar
 
Join Date: May 2017
Location: West (by God) Virginia
Posts: 36
Received 5 Likes on 4 Posts
83 300D 617T(retired), 96 E300 606n/a(retired), 99 E300 606T(retired), 07 E320 BT, 14 E3504M
Remove the glow plugs and unplug the CDI control unit then jump the starter relay until you are satisfied that the cylinders are free from coolant.

Nothing is likely to happen as is, depending on how much you dropped down there, but to be on the safe side, that's what I would do. Last time I quoted a reman 642 engine from MBZ it was around $17k. (Used ones are cheaper of course)

Better to be safe than broke!!

Also, side note, burnt and/or unburnt coolant and DPF's don't play together well, so keep that in mind.
pgsurface is offline  
Reply Like
The following users liked this post:
biker349 (10-31-2019)
Old 10-31-2019, 01:06 PM
  #3  
Out Of Control!!

 
chassis's Avatar
 
Join Date: Sep 2018
Location: unbegrenzt
Posts: 13,316
Received 3,920 Likes on 3,086 Posts
2017 GLE350 4MATIC
Turn the engine by hand a few times with a wrench on the crankshaft, with injectors or glow plugs removed.
chassis is online now  
Reply Like
Old 11-03-2019, 05:14 AM
  #4  
Junior Member
Thread Starter
 
piuric's Avatar
 
Join Date: Jun 2016
Posts: 30
Received 4 Likes on 4 Posts
2009 ML 320 CDI
Thank you PGSurface, where is the CDI control unit? Is it the glow plug module or the Engine control module?
Or should I just start the car with the diesel injectors electrical cable unplugged?
piuric is offline  
Reply Like
Old 11-03-2019, 05:18 AM
  #5  
Junior Member
Thread Starter
 
piuric's Avatar
 
Join Date: Jun 2016
Posts: 30
Received 4 Likes on 4 Posts
2009 ML 320 CDI
Originally Posted by chassis
Turn the engine by hand a few times with a wrench on the crankshaft, with injectors or glow plugs removed.
Thank you but I am afraid by turning it slowly by hand the coolant would still be inside the cylinders.
I was wondering to start the car without the glow plugs and with the diesel injectors electrical cables unplugged.
piuric is offline  
Reply Like
Tags
Back to Subforum
Mercedes Tech Talk
View Next Unread
Starting DAS after 10 years, asking for Windows XP password

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes, average.
Show Printable Version
Email this Page

Advanced Search
Quick Reply: W164, OM642, afraid to hydrolock the engine


Reply Closed Thread Share

All times are GMT -4. The time now is 10:38 PM.