B&S 20 Twin II Leaking Oil


Old 03-31-09, 03:51 PM
Thread Starter
Join Date: Mar 2009
Location: Tennessee
Posts: 2
B&S 20 Twin II Leaking Oil

I have a Briggs 20 Twin II with an major oil leak coming from where the left cylinder (with exhaust and intake facing forward) connects to the center case. Oil is leaking at the rate of about 1 drip per 10 seconds. The leak is at the bottom of the left cylinder behind the very first cooling fin. It appears to be leaking at the gasket where the upper part of the motor connects to the base (the joint about 3" above where the motor bolts on to the the mower).

How difficult is it to get this lower base apart to replace this gasket. The mower/drive pulley appears to be pressed on from the bottom. Would I have to dissasemble the entire motor from the top to get to this?

Sponsored Links
Old 03-31-09, 07:45 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
You can't change it from the top of the engine. You have to remove the engine and unbolt the sump cover to change it. Just remove the 4 engine mounting bolts and the electrical and cables on the engine, drop the exhaust, remove the bolt in the center of the big pulley on the crankshaft and slide it off and you'll be able to lift the engine off the frame and access the sump cover bolts. It's not a bad job...
Old 04-02-09, 06:24 AM
Thread Starter
Join Date: Mar 2009
Location: Tennessee
Posts: 2
Great. I'm going to tackle it this weekend - grass is getting long.

Thanks for the info!

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

Thread Tools
Search this Thread
Display Modes