Petrol in engine oil?
Thread Starter
Racer
Joined: Jul 2007
Posts: 256
Likes: 0
From: Glasgow, Scotland
Petrol in engine oil?
I have found that I have a 3rd more oil on the dipstick above max level, the oil seems very thin, also smells of petrol, so petrol must be getting in there, how would this happen?, iam thinking piston rings worn, getting down between piston and clylinder?
Iam buying a new engine, so doesnt matter too much, just keen to know how its happening
cheers
dave
Iam buying a new engine, so doesnt matter too much, just keen to know how its happening
cheers
dave
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
I have found that I have a 3rd more oil on the dipstick above max level, the oil seems very thin, also smells of petrol, so petrol must be getting in there, how would this happen?, iam thinking piston rings worn, getting down between piston and clylinder?
Iam buying a new engine, so doesnt matter too much, just keen to know how its happening
cheers
dave
Iam buying a new engine, so doesnt matter too much, just keen to know how its happening
cheers
dave
OH, and I love Scotland. Are they playing at Troon and Turnbury yet?
Burning Brakes
Joined: Jan 2006
Posts: 1,088
Likes: 181
From: NC
2022 C2 of the Year Finalist - Modified
I HAD THE SAME THING HAPPEN ON A SMALL BLOCK BACK IN THE '70'S.
IT TURNED OUT TO BE THE DIAPHRAM IN THE FUEL PUMP HAD CRACKED WHICH WILL ALLOW FUEL TO GET INTO THE OIL PAN.
CHECK IT AND LET ME KNOW IF THIS IS THE PROBLEM.
GOOD LUCK!!
BILL SR
IT TURNED OUT TO BE THE DIAPHRAM IN THE FUEL PUMP HAD CRACKED WHICH WILL ALLOW FUEL TO GET INTO THE OIL PAN.
CHECK IT AND LET ME KNOW IF THIS IS THE PROBLEM.
GOOD LUCK!!
BILL SR
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Yep. Replace your fuel pump. Also, you need to get an oil flush kit, and perform it, along with a new oil change, and maybe another one in 500 miles.
Keep an eye open for leaks, and check the oil you drain for metal. If the oil was compromised at all, the bearings may have suffered excessive wear.
Keep an eye open for leaks, and check the oil you drain for metal. If the oil was compromised at all, the bearings may have suffered excessive wear.
Thread Starter
Racer
Joined: Jul 2007
Posts: 256
Likes: 0
From: Glasgow, Scotland
cheers
dave
Intermediate
Joined: Apr 2007
Posts: 47
Likes: 0
From: Melbourne Vic.
Me too
Had a similar problem recently, (1/3)fuel tank emptied in to the sump, only I have a Holley blue electric fuel pump. Put the problem down to syphoning thru a stuck float on the Webers.
DB, can you give me a bit more info on the "oil flush kit" I am not familiar with them and while I drained the sump and refilled with fresh oil, concerned that might not be enough.
Tony
DB, can you give me a bit more info on the "oil flush kit" I am not familiar with them and while I drained the sump and refilled with fresh oil, concerned that might not be enough.
Tony
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Thread Starter
Racer
Joined: Jul 2007
Posts: 256
Likes: 0
From: Glasgow, Scotland
Yep. Replace your fuel pump. Also, you need to get an oil flush kit, and perform it, along with a new oil change, and maybe another one in 500 miles.
Keep an eye open for leaks, and check the oil you drain for metal. If the oil was compromised at all, the bearings may have suffered excessive wear.
Keep an eye open for leaks, and check the oil you drain for metal. If the oil was compromised at all, the bearings may have suffered excessive wear.
dave
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
It's easy. Just go to a local parts store, and ask them for help finding an oil flush product. You simply empty it into the crankcase with new oil, and let it run for a bit. Then drain it, and then fill with new oil again.
Intermediate
Joined: Apr 2007
Posts: 47
Likes: 0
From: Melbourne Vic.
How good is it to have an interest (our vettes) and a Forum that enables Dave in Scotland, DB in the States and me in Australia to chew the fat.
Thanks DB, I will give that a try. I think I had better start looking out for oil leaks too. I guess that the fuel could soften the lips on the seals?
Tony
Thanks DB, I will give that a try. I think I had better start looking out for oil leaks too. I guess that the fuel could soften the lips on the seals?
Tony
Thread Starter
Racer
Joined: Jul 2007
Posts: 256
Likes: 0
From: Glasgow, Scotland
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Melting Slicks
Joined: Dec 2006
Posts: 2,669
Likes: 3
From: Kingston Ontario
Are you sure the problem wasn't just from flooding the engine while attempting to start? Have you had any recent malfuctions/difficulties where you may have flooded the engine? If so, I would change the oil and filter and re-assess.
Not saying it couldn't be the pump, however.
Not saying it couldn't be the pump, however.
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
That much fuel in the oil is from a ruptured fuel pump diaphragm. If you have run the engine like that, you need to drop the pan and check your bearings - gasoline in the oil will destroy a set of bearings almost immediately.
Intermediate
Joined: Apr 2007
Posts: 47
Likes: 0
From: Melbourne Vic.
Lars
You sure know how to ruin a guy’s day.
I have a 9 quart Morroso sump on the LS7 as well as a 3 quart accusump so I am hoping the contamination won’t be as bad given the larger volume of oil and the very brief period the engine ran with it.
But I am still worried.
Tony
You sure know how to ruin a guy’s day.
I have a 9 quart Morroso sump on the LS7 as well as a 3 quart accusump so I am hoping the contamination won’t be as bad given the larger volume of oil and the very brief period the engine ran with it.
But I am still worried.
Tony