Engine blows oil out muffler & dipstick tube

Reply

  #1  
Old 06-01-08, 06:37 AM
michaeljp86's Avatar
Member
Thread Starter
Join Date: May 2005
Location: USA
Posts: 478
Question Engine blows oil out muffler & dipstick tube

My grandmas neighbor gave me a push mower thats in great shape. It has a 6.5hp briggs on it but it wont run good. I checked the oil yesterday and it was fine. I ran the engine and it wont run at high rpms and oil blows out the exhaust and I unscrewed the dipstick and oil comes splattering out while it was running. I pulled the head off yesterday and everything looks fine. I thought maybe it had a cracked piston or something.

Anybody have any idea on whats wrong?
 
Sponsored Links
  #2  
Old 06-01-08, 07:02 AM
thiggy's Avatar
Member
Join Date: May 2002
Location: Alabama
Posts: 718
If it is blowing oil out the exhaust and running poorly, it is not "in great shape". You should never open the oil filler when and engine is running. It will blow oil out! When you had the head off, did you inspect the cylinder wall? Was it scored and scratched? Did you check the compression with a gauge? What makes you think the piston may be cracked, did you see something amiss on the top of it? I would guess that a worn or broken oil ring is more likely than a cracked piston. A little more info would be helpful.
 
  #3  
Old 06-01-08, 07:08 AM
michaeljp86's Avatar
Member
Thread Starter
Join Date: May 2005
Location: USA
Posts: 478
The head is still off, the cylinder looks fine, lots of carbon buildup on the head. The head gasket disintegrated when I pulled it off. The mower looks in great shape, as far as the engine I have no idea. They got a new one, they didnt say why. It doesnt look very old so I didnt think it would be wore out. My grandma lives in a trailer park so this probably cut 100sqft of grass once a week.
 
  #4  
Old 06-01-08, 09:45 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
Sounds like the oil is too full?
 
  #5  
Old 06-02-08, 03:11 AM
Member
Join Date: Apr 2008
Location: Southeast Louisiana
Posts: 17
Change the oil and fill to proper level.
Check to make sure the choke is not staing close or partially closed.
Possible rebuild of the carb.
Change the spark plug.
Make sure gas is fresh and not been in tank for a while.
 
  #6  
Old 06-02-08, 10:25 PM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
I overlooked where you said you checked the oil and it was fine. Is this an OHV engine? If so, it could be a blown head gasket between the cylinder and push-rod chamber.
 
Reply

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