Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 30-11-2017, 16:42   #1
Registered User

Join Date: May 2017
Posts: 5
Yanmar 2GMF Questions

I'm servicing an old (new to me) Yanmar 2GMF. I want to remove and clean the heat exchanger but I can't find the drain port for the engine coolant. I have the original owner's manual and a shop manual but neither tells where the mystery drain plug is hidden. Perhaps the problem is that the engine is in a very confined space, with only about 3 inches clearance on each side, so I can only see the sides using a mirror and light, and then not very well. Anyway, if someone can tell me where it is I will be suitably embarrassed when it turns out that it's so obvious.

I'm also wondering if there's any reason I shouldn't have a machinist fit an oil drain plug into the oil pan. Again, because of the tight fit of the engine box it's very difficult to pull the old oil out of the very small (about 3/8 inch) dipstick hole. A drain plug would also allow removal of all the crud that sank to the bottom over the last 30-odd years. Is there a good engineering reason that caused Yanmar to so assiduously avoid oil drain plugs?
__________________

john-o is offline   Reply With Quote
Old 30-11-2017, 17:48   #2
Registered User
 
four winds's Avatar

Join Date: Oct 2010
Location: Wandering the US Gulf Coast
Boat: 78 Pearson323 Four Winds
Posts: 2,200
Re: Yanmar 2GMF Questions

Should be on the underside (bottom) of the heat exchanger. Near the flywheel end on some models and farther forward on others.

The block drain is near the oil filter on the side of the block if you want to get it all out for a complete change.
__________________

__________________
Life begins at the waters edge.
four winds is online now   Reply With Quote
Old 30-11-2017, 17:56   #3
Registered User
 
four winds's Avatar

Join Date: Oct 2010
Location: Wandering the US Gulf Coast
Boat: 78 Pearson323 Four Winds
Posts: 2,200
Re: Yanmar 2GMF Questions

In this pic...

A- drains the seawater from the tube bundle

B- drains the freshwater from the exchanger housing.

Note, this is from a manual covering all GM engines. Some illustrations are representative of the type and may not be the specific model of inquiry. But it's under there somewhere.
Attached Thumbnails
Click image for larger version

Name:	Screenshot_2017-11-30-19-49-29.png
Views:	78
Size:	69.5 KB
ID:	159995  
__________________
Life begins at the waters edge.
four winds is online now   Reply With Quote
Old 30-11-2017, 19:58   #4
Registered User

Join Date: Nov 2016
Location: Sarnia ON
Boat: S2 9.1
Posts: 78
Re: Yanmar 2GMF Questions

I have a 2GMF and those pictures look about right.
Gary Mc is offline   Reply With Quote
Old 30-11-2017, 20:09   #5
Registered User

Join Date: Sep 2007
Location: Palm Beach Gardens, Fl
Boat: Gemini, 1993 #379 34' Shearwater
Posts: 362
Re: Yanmar 2GMF Questions

I thought the Coast Guard prohibited a drain plug in the oil pan???
__________________
Capt. Stuart Bell
Ranger R-25
stu@shearwater-sailing.com
captstu is offline   Reply With Quote
Old 01-12-2017, 07:14   #6
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 6,482
Re: Yanmar 2GMF Questions

Quote:
Originally Posted by captstu View Post
I thought the Coast Guard prohibited a drain plug in the oil pan???


What? Care to cite this hearsay.
Sailmonkey is online now   Reply With Quote
Old 01-12-2017, 08:20   #7
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 20,530
Re: Yanmar 2GMF Questions

Unless you have an unusual situation there is usually no room for an oil drain pan under the engine anyway, thus a pug is useless unless you are going to drain to the bilge. Are you using a vacuum type dipstik oil extraction device?
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 01-12-2017, 08:35   #8
Registered User

Join Date: May 2017
Posts: 5
Re: Yanmar 2GMF Questions

Thanks for your help everyone, I found the coolant drain right where you said it was. As to the oil drain, there is lots of room under the engine to put a pan or even a funnel and jug to catch the oil (full keel), but I can barely get my hand near the dipstick. I'm an using a vacuum type oil extractor but it's very difficult and it must leave some residue.
john-o is offline   Reply With Quote
Old 01-12-2017, 09:04   #9
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 6,981
Re: Yanmar 2GMF Questions

Quote:
Originally Posted by john-o View Post
>>>>>>>>>>>>>>>>As to the oil drain, there is lots of room under the engine to put a pan or even a funnel and jug to catch the oil (full keel), >>>>>>>>>>>>>>>>>
You may want to consider adding an oil drain hose to the drain pan.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is offline   Reply With Quote
Old 01-12-2017, 16:45   #10
Registered User
 
four winds's Avatar

Join Date: Oct 2010
Location: Wandering the US Gulf Coast
Boat: 78 Pearson323 Four Winds
Posts: 2,200
Re: Yanmar 2GMF Questions

That's unusually good access to the pan.

Here's a no weld plug kit you might consider.


https://www.amazon.com/80250-Automat..._1512174850716

It's for auto transmissions which almost never have a plug, but of course would work fine for the oil pan, too. B & M is a well regarded performance transmission company for decades now. Probably good part.
__________________

__________________
Life begins at the waters edge.
four winds is online now   Reply With Quote
Reply

Tags
2gm, yanmar

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Yanmar 2GMF - Fuel hose size? pickpaul Engines and Propulsion Systems 6 29-07-2014 13:52
Yanmar 2GMF Oil Level Rising john130 Engines and Propulsion Systems 2 29-09-2013 19:31
Yanmar 2gmf Electric Fuel Pump madmac Engines and Propulsion Systems 1 28-05-2010 16:43
Yanmar 2GMF transmission freightdog Propellers & Drive Systems 10 06-08-2008 17:07
Yanmar 2GMF transmission freightdog Construction, Maintenance & Refit 2 01-08-2008 19:51



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:18.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.