my brothers sc300's spark plugs are all covered in oil? - ClubLexus - Lexus Forum Discussion


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my brothers sc300's spark plugs are all covered in oil?

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Old 06-09-08, 08:29 PM   #1
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Smile my brothers sc300's spark plugs are all covered in oil?

my brothers 92 sc300's spark plugs are all covered in oil! all six of them.
im stuck? you think all the valve stem seals are possibly worn out? thanks
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Old 06-09-08, 08:50 PM   #2
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prolly the valve cover gaskets leaking and oil is getting into the sparkplug wells
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Old 06-09-08, 10:49 PM   #3
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Old 06-09-08, 11:49 PM   #4
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i agree. if the covers leak the plugs can have oil on top of them.
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Old 06-10-08, 03:27 AM   #5
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when changing plugs, replace those gaskets too
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Old 06-10-08, 07:40 AM   #6
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when changing plugs, replace those gaskets too
Do you mean replace the valve cover gaskets? I am going to replace those (they just came in yesterday!).

My question is are there rubber spark plug seals/grommet/gasket things?

The last time I had the covers off I swear I saw some; however the guys at Pembroke Pines and Sewell said there is no such part....

Whats the deal?
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Old 06-10-08, 08:20 AM   #7
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Nope there are no seals/gaskets or anything like that for the spark plug. At least not on mine...

Sounds like its your valve cover gaskets tho.
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Old 06-10-08, 10:40 AM   #8
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Valve cover gasket for sure.
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Old 06-17-17, 11:51 AM   #9
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Default my sc300 spark plugs are drowned in oil on the top of the plug

So I am new to the lexus community. So i bought a 94 lexus sc300 with the non vvti motor. So i had to replace the alternator i noticed a oil leak. So i got it home and noticed that new water pump had oil just sitting in the creases of the pump. So automatically i assumed it was the cam seals well i know the timing belt and pump where changed before i bought it so i went on craigslist found a mechanic he told me the seals are not leaking he tried to tell me the crank seal is but there is no oil leaking from the bottom of the motor. He also said the bracket behind the cam pulleys needs a new gasket. So my big thing is oil is leaking on the alternator i need help asap im thinking about just changing the valve cover gasket
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Old 06-17-17, 11:18 PM   #10
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Sounds like it's the distributor o-ring. That's a common problem. Swap that out.

Leaky valve covers are pretty obvious - look for oil leaking down from them into the spark plug valley or alongside the head. Make sure to check the fronts behind the cam gear cover

Cam seals, front main seal - look for oil behind the cam gear cover. Cam seals leak from behind the gears and drip down the head. You'll see it, or be able to feel it. A timing belt that's got oil on it (or the edges) is from a leaky front main seal. Another way to check for this is to get under the car, remove the splash shield and inspect the bottom of the lower timing cover directly behind the crank pulley.
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Old 06-17-17, 11:22 PM   #11
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if it's on the alternator, should be distributor o ring

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So I am new to the lexus community. So i bought a 94 lexus sc300 with the non vvti motor. So i had to replace the alternator i noticed a oil leak. So i got it home and noticed that new water pump had oil just sitting in the creases of the pump. So automatically i assumed it was the cam seals well i know the timing belt and pump where changed before i bought it so i went on craigslist found a mechanic he told me the seals are not leaking he tried to tell me the crank seal is but there is no oil leaking from the bottom of the motor. He also said the bracket behind the cam pulleys needs a new gasket. So my big thing is oil is leaking on the alternator i need help asap im thinking about just changing the valve cover gasket
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Old 06-18-17, 10:13 AM   #12
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So I degreased the motor and it's not leaking from the bottom I looked by the harmonic balancer no oil I have a crap load of oil caked behind the distributor and by the tensioner pulley I will post pics
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Old 06-18-17, 11:21 AM   #13
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Old 06-20-17, 07:33 AM   #14
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As was mentioned earlier, check your distributor o-ring. You will be able to tell if the oil is coming from the distributor by looking at the shield circled in red in the attached picture.
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my brothers sc300's spark plugs are all covered in oil?-0619071317-01.jpg  
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