Westerbeke W30 (4-91) rear oil leak - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 

Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Reply
 
LinkBack Thread Tools
  #1  
Old 07-03-2011
Junior Member
 
Join Date: Jul 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
sanibel sailor is on a distinguished road
Westerbeke W30 (4-91) rear oil leak

Hello-
I have a fairly significant rear oil leak in my W30 engine. This is a slightly newer version of the 4-91. The motor starts promptly even without glowplugs (in Florida) and the crankcase breather is not clogged. My working diagnosis was a leaking rear seal. As Westerbeke no longer carries this part, I ordered one for a Leyland 4/25 tractor which has the same engine, but it has not arrived yet.
I have disassembled the back end- reduction gear/bellhousing/flywheel and backplate. I was initially expecting to find a lip type seal in a carrier based on the Westerbeke parts diagram, but I have the older round style rear plate and the parts book does not show a seal anywhere. I have also looked at the Austin FX3 (London Taxi) parts diagram and the Nash Metropolitan (same block) parts diagrams and don't see where the seal is. I am not able to identify a seal on the crank by looking at it. I believe I am looking at the back of the rear main bearing at the back of the crankcase.
Anyone familiar with this engine?
John Churchill
NURDLE
1979 Bristol 35.5
Sanibel FL
Attached Thumbnails
Westerbeke W30 (4-91) rear oil leak-westerbeke-back-end-013.jpg   Westerbeke W30 (4-91) rear oil leak-westerbeke-back-end-010.jpg   Westerbeke W30 (4-91) rear oil leak-westerbeke-back-end-005.jpg   Westerbeke W30 (4-91) rear oil leak-westerbeke-back-end-009.jpg   Westerbeke W30 (4-91) rear oil leak-westerbeke-back-end-001.jpg  

Reply With Quote Share with Facebook
  #2  
Old 07-04-2011
JimsCAL's Avatar
Senior Member
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,426
Thanks: 2
Thanked 35 Times in 34 Posts
Rep Power: 8
JimsCAL is on a distinguished road
Pretty sure there has to be a seal where the shaft exits the housing. Suspect its under the coupling you uncovered. Not clear how that is held on as I don't see a nut. Press fit?
Reply With Quote Share with Facebook
  #3  
Old 07-04-2011
Junior Member
 
Join Date: Jul 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
sanibel sailor is on a distinguished road
The hub with the bolts sticking out is the crankshaft. That part does not come off, so I don't think anything goes in behind it. Could there be something built into the main bearing?
Reply With Quote Share with Facebook
  #4  
Old 07-05-2011
Member
 
Join Date: Jan 2011
Posts: 83
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
shogan50 is on a distinguished road
Might be a rope type seal. Google "rope type rear main seal." It requires removal of the crank shaft to replace. Not saying its a good idea, but a long time ago, I changed half of one by pulling the pan and last bearing with modest success.
__________________
Islander 30 MKII "Sojourn"


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #5  
Old 07-05-2011
hellosailor's Avatar
Plausible Deniability
 
Join Date: Apr 2006
Posts: 10,611
Thanks: 2
Thanked 87 Times in 85 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
I suppose this would mean "London Taxi engine" is now the largest known member of the "British Sports Car" engineering school. (Said with some fondness for both.)

No doubt someone will come up with the definitive answer for you, or Westerbleak perhaps can be, ah, extorted out of it?

Rear main seal is very much what comes to mind when someone says "lots of oil from the back of the engine" though.

Can the folks who sold you the tractor part, put you in touch with whoever supplies it? Is that a "British Leyland" engine actually?
Reply With Quote Share with Facebook
  #6  
Old 07-05-2011
Junior Member
 
Join Date: Jul 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
sanibel sailor is on a distinguished road
ENVELOPE PLEASE! - The Answer

Called Westerbeke's phone tree which sent me to my distributor who sent me to a guy at a different branch. He was very helpful and familiar with the later W30's with a lip seal in a carrier, he reviewed with me common causes of leaky seals- piston blowby and clogged crankcase vent systems, but did not know about my engine. He called Westerbeke and based on my serial number, he found that there is no rear seal. Apparently it is just crankcase pressure against the crank that keeps the oil in, there may be a spiral groove cut in the crank that wicks the oil back into the crankcase. Judging by the amount of oil my guess is that it is the gasket that seals the distributor gear area from the backplate. I know diesels don't have distributors but this engine originated as a gasoline engine.

Made by British Motor Company, later became British Leyland

Read about its history here BMC B-Series engine - Wikipedia, the free encyclopedia

Tractors were the Leyland 4/25 and 154 models

The Westerbeke 4-107 had the rope seal.
Reply With Quote Share with Facebook
  #7  
Old 07-05-2011
Junior Member
 
Join Date: Jul 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
sanibel sailor is on a distinguished road
the London Taxi model was the Austin FX3. Same engine.
Reply With Quote Share with Facebook
  #8  
Old 08-26-2011
Junior Member
 
Join Date: Jul 2011
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
sanibel sailor is on a distinguished road
Finally got her all back together. Delayed by tons of "as long as I am at it" projects - redo dipstick/wiring harness/repaint/fuel filter relocate/waterpump/clean heat exchanger/new exhaust, etc.
Took oil pan off as well. Replaced the gasket between the rear block and the motorplate, suspecting that was the leak source.
Engine is in much better shape now than when I started.

Somewhat distressing that the thing still leaks.
Reply With Quote Share with Facebook
  #9  
Old 08-29-2011
Senior Member
 
Join Date: Sep 2010
Posts: 219
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
Rick486 is on a distinguished road
Brings back memories. I had a Westerbeke 4-107 in my P39 for years, then re-powered with a brand new Perkins 4-108. Both were great engines and neither one ever let me down. But you know what? They both leaked oil constantly from the bottom of the bell housing, which I assumed was the rear main seal. I just lived with it and kept fresh oil absorbers beneath the leaking spot all the time. Guess the Brits just can't keep oil in an engine. Sounds like yours might be a bit more though. Good luck with the fix.
Reply With Quote Share with Facebook
  #10  
Old 11-05-2011
Member
 
Join Date: Apr 2008
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
SantaAna12 is on a distinguished road
Find any good suppliers for your engine? ($) I have the same.....and .....the same leak. However, it was leak free the first fifteen years. I am going to try the rear seal again this winter, and would appreciate any tips.
Reply With Quote Share with Facebook
Reply


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

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Westerbeke 30 Fuel leak TPynckel Diesel 0 12-19-2010 05:44 PM
Oil leak - Low level Westerbeke 27 swanfrogg Gear & Maintenance 2 11-05-2008 03:59 AM
Yanmar smoking out rear marinesniper Gear & Maintenance 5 07-26-2008 07:05 AM
Westerbeke 40 oil leak berwick1 Gear & Maintenance 0 08-15-2006 05:46 PM
Rear Seal Replacement tm3 Gear & Maintenance 2 01-07-2004 03:30 PM


All times are GMT -4. The time now is 10:52 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.