Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 11-08-2022, 13:27   #1
Registered User

Join Date: Nov 2015
Location: Nova Scotia
Boat: Hunter Vision 32’
Posts: 7
Yanmar 3gm30 Leakey Gasket

Hey guys, I replaced the manual fuel pump on the engine last year and itís leaking oil where itís installed ( between the pump and engine). I cleaned the surface and used the gasket that was supplied and not sure if I was supposed to use some kind of gasket glue or anything. Any suggestions would be appreciated and thanks.
Tyemac is offline   Reply With Quote
Old 11-08-2022, 14:43   #2
Registered User
 
thesaltytar's Avatar

Join Date: Feb 2022
Location: Savannah, GA
Boat: 1956 Bud McIntosh 36' schooner
Posts: 279
Re: Yanmar 3gm30 Leakey Gasket

I haven't worked with this engine directly, and so would ask if there is a technical manual that covers this, but that being said....

Three points to consider:

1) Make sure the mating faces are clean. Both mating surfaces should be clean and relatively free of imperfections. Spray them down with a solvent such as break cleaner.

2) Is the pump housing aluminum or thin gauge metal?

Consider that previous over-torque of aluminum is a common way to warp items such as flanges, valve covers, etc. Often these items are over-tightened when leaks develop and this in turn warps the mating surfaces so the leak gets worse, then the gasket is replaced and lo! Still leaks. Any softer material like aluminum or thin metal is suspect. Check it with a straight edge and try to follow torque specs. If torque specs are unavailable, look them up based on the fastener characteristics, such as:

https://www.google.com/url?sa=t&sour...c5KTaqrYLMdsUb

Note that lubrication of bolts reduces torque. Try not to exceed torque specs. I have a oiler that tightens till the wrench clicks and added a "bit more to be safe" ... bless his heart. This was a long paragraph because I see warped housings often from things like this, because then ideally you need a replacement whatever-it-is that doesn't seal.

3) Compensate for imperfections by changing the gasketing material or technique.

Is the gasket material paper? Is it thin? If the flange faces are imperfect or the housing is otherwise warped, you can probably get away from the manufacturer provided gasket. It is likely paper (because it has to resist oil). Thin gaskets allow higher pressures but fewer face imperfections. It's a design choice. The pump is probably low pressure. You could get some thicker paper, such as garlock, and cut your own gasket. Put it on the flange and tap with the ball end of a ball peen hammer. The gasket with almost make itself.

If all of this fails spread a THIN layer of permatex on the gasket (pump side) with a couple dots on the flange side to hold it in place. Position the gasket and let it set 15-20 minutes so the surface of the permatex solidifies, THEN complete assembly. This will make a proper gasket as opposed to squeezing out all of the gasket maker material upon compression.

Best of luck OP! [emoji1696]
thesaltytar is offline   Reply With Quote
Old 11-08-2022, 15:13   #3
Moderator

Join Date: Feb 2010
Location: Australia
Posts: 3,480
Re: Yanmar 3gm30 Leakey Gasket

It can be a tricky little gasket to install but consider the possibility that the oil leak is from the oil feed line just behind the feed pump. Itís a thin steel tube and if the mixer elbow above happens to leak raw water, that tube will and does corrode and leak. [ATTACH]262683
Attached Thumbnails
Click image for larger version

Name:	IMG_2874.jpg
Views:	45
Size:	383.6 KB
ID:	262683  
skipperpete is offline   Reply With Quote
Old 27-08-2022, 13:48   #4
Registered User

Join Date: Nov 2015
Location: Nova Scotia
Boat: Hunter Vision 32’
Posts: 7
Re: Yanmar 3gm30 Leakey Gasket

So what I did was I bought some gasket material and made a new gasket. It seems to be working. Thanks for your input guys 🙂
Tyemac is offline   Reply With Quote
Old 27-08-2022, 15:06   #5
Registered User

Join Date: Mar 2020
Location: Kentucky
Boat: TP52
Posts: 68
Re: Yanmar 3gm30 Leakey Gasket

It's a good idea to replace the bolts too. They can stretch over time with the constant tapping of the pump
RocketScott is offline   Reply With Quote
Reply

Tags
3gm, 3gm30, gasket, 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 3GM30 Gear Case Gasket and sealant dmksails Engines and Propulsion Systems 1 25-05-2022 19:00
Gallons / Hour with a Yanmar 3gm30 Dave in Eugene General Sailing Forum 32 18-01-2013 13:23
3gm30 Yanmar full of hose water.... Dave in Eugene General Sailing Forum 14 12-02-2008 19:15
coolant water take off from Yanmar 3gm30 Dave in Eugene General Sailing Forum 6 31-12-2007 20:39
Hard Starting Yanmar 3GM30 sailcruz Engines and Propulsion Systems 2 15-05-2007 13:47

Advertise Here


All times are GMT -7. The time now is 01:27.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.