Briggs 4.5 engine drinks oil


Old 09-20-19, 12:04 PM
Thread Starter
Join Date: Jun 2006
Location: United States
Posts: 2,414
Received 2 Votes on 2 Posts
Briggs 4.5 engine drinks oil

I picked up a free mower from Craigslist that "Won't run".
Briggs 4.5hp - 10H902-0216-E1 code - 05070154
So I started checking, first it had no oil so I put oil in it, removed the air filter and noticed the carb throat was black from oil, so I sprayed a shot of brake parts cleaner down the intake tube of the carb and gave the rope a pull it fired up and screamed, the throttle linkage was bent which is what people do when a diaphragm starts to go bad to compensate for the surging, I replaced the diaphragm and set the rpm to about 3000. I checked the compression and it had a little over 120lb so I filled the fuel tank up and fired it up and it smoked like it had been tipped or overfilled on oil so I decided to let it set and clear itself well it finally quit and never cleared up there was still a little as in it but the oil was all gone, the engine was not frozen. I have picked up at least a hundred "Won't run" mowers and have never had a engine with compression use that much oil that quick, there are no leaks on the engine anywhere. I need some shadetree ideas to address the oil usage problem, I can always set it aside and use it for parts. Have a good one. Geo
Sponsored Links
Old 09-20-19, 07:47 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 17,178
Received 17 Votes on 15 Posts
The high compression reading was probably because there was so much oil in the combustion chamber, it took up much of the available space and gave a false reading. Also that oil helps seal the cylinder for the split second it takes for the reading. Sometimes you get so much oil in a cylinder that the compression is too high for the engine to even turn over. That's my guess. A quick pull of the head will almost surely reveal a heavily scored cylinder wall.
marbobj voted this post useful.

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
Ask a Question
Question Title: