2003 is300 oil leak (valve cover gasket already replaced)
10-10-17, 11:46 AM
#1
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2003 is300 oil leak (valve cover gasket already replaced)
My 03 is300 has 150,000+ miles I bought it knowing it had some sort of oil leak and replaced the valve cover gasket it helped somewhat but I still notice the engine is leaking oil. It seems to be coming from the front of the engine but I have no idea where. Any ideas?
10-11-17, 05:49 AM
#2
Probably your crank seal, but there are other places it may be leaking. I believe there is a thread
https://www.clublexus.com/forums/is-...-oil-leak.html
that discusses various places the engine can spring a leak. Try searching for "seal" on this board.
https://www.clublexus.com/forums/is-...-oil-leak.html
that discusses various places the engine can spring a leak. Try searching for "seal" on this board.
10-11-17, 09:47 AM
#3
Probably your crank seal, but there are other places it may be leaking. I believe there is a thread
https://www.clublexus.com/forums/is-...-oil-leak.html
that discusses various places the engine can spring a leak. Try searching for "seal" on this board.
https://www.clublexus.com/forums/is-...-oil-leak.html
that discusses various places the engine can spring a leak. Try searching for "seal" on this board.
12-06-17, 10:53 AM
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Ive got an unknown leak on my 05. I have replaced valve cover gasket, cam seals, crank seals, water pump, timing belt, oil pan seal at 144,000 miles. Less than 300 miles later my engine was coated in oil as it was before. Any ideas what i should be looking at next? Oil pump seals?
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05-04-18, 02:46 AM
#11
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My is300 is leaking oil on to the water pump from behind the rear timing belt cover I’m leaning toward a bad cam seal. I just did a full timing belt and seal service 10k ago. I also rebuilt the vvti.
Last edited by Heykw; 05-08-18 at 09:40 AM.
05-04-18, 03:05 AM
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Possibly a bad cam seal. My vvti gear caused oil to build on the water pump and timing covers. You can take the top timing belt cover off and hold a piece of paper or cardboard next to the vvti gear and see if it slings oil on the paper.
05-04-18, 06:55 AM
#13
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Last edited by Heykw; 05-08-18 at 09:39 AM.
05-08-18, 09:40 AM
#15
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Good point I’ll check that.
Update
I resealed the cam caps and replaced the valve cover gaskets at the same time using the Toyota sealent and valve cover gaskets.
The leak appeared to be fixed.��
Hopefully this information will help someone else in the future. Thank you all for your help
Update
I resealed the cam caps and replaced the valve cover gaskets at the same time using the Toyota sealent and valve cover gaskets.
The leak appeared to be fixed.��
Hopefully this information will help someone else in the future. Thank you all for your help
Last edited by Heykw; 05-21-18 at 02:00 AM.