Fuel in crankcase

Tiny
PISTONHEAD43
  • MEMBER
  • 1991 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 230,000 MILES
I have a 1991 chevy s10 with a rebuilt tbi 4.3(not vortec) and one day I cranked the motor and I heard an explosion. It was caused by gasoline getting in the crankcase and then it ignited. When I changed the oil I noticed that the oil was REALLY thin almost like water. It bent the valve covers out. For a while now I have noticed that the oil level was getting higher and higher and I didnt even add oil to it. I replaced the valve covers and the oil and now the crankcase is filling up on its own again. Do you know whats causing the crankcase to fill with gas?
Friday, February 11th, 2011 AT 12:10 AM

2 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Must be sucking it in from somewhere like charcoal canister?
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Tuesday, May 3rd, 2011 AT 3:17 AM
Tiny
FIXITMR
  • MECHANIC
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If it has fuel injection the lines under intake are leaking.
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Tuesday, May 3rd, 2011 AT 3:20 AM

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