Question about 2001 Toyota Sienna

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How to replace valve stem oil seals? - 2001 Toyota Sienna

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  • yadayada
    yadayada May 11, 2010

    you need allot of special tools so not a DIY job.


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To change any valve stem seal, you need to remove everything above the valve itself, including the spring. On most engines it is possible to do with the heads on the engine depending upon how much room you have. To keep the valve from falling into the cylinder, I use a length of 1/4" cotton rope (like you hang clothes on). Insert it into the cylinder when near TDC and gently turn the engine till it's pressing on the valve, Then when removing the spring the rope will suport the valve. There is a spring removal tool that looks like a larger version of a top terminal battery cable remover. You can use that to take spring off. DO NOT TURN THE ENGINE 'TILL ROPE HAS BEEN REMOVED. TURN ENGINE BACK SLIGHTLY TO RELEASE IT. If you find that any valve stems rock back and forth more than a very tiny bit, remove the heads and have the guides replaced. If your repair requires cams to be removed, be sure you have instructions to re set cam positions (same as timing chain replacement) Some people retain the valve with compressed air, but if the air flow stops or you press down on the valve it can relaease and fall.
Good sure that there is a reason for doing this work and that you don't have worn rings.

Posted on Jul 28, 2009

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Posted on Jan 02, 2017

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SOURCE: replace valve stem oil seals

no you can't. you have to remove the head. sorry. why do u want to do that. is it smoking blue? if thats the case u will have to do a complete service on the head

Posted on Feb 22, 2009

  • 98 Answers

SOURCE: The dealer is saying that I need to replace the

it would be if there was smoke or the car is burnig a lot of oil if not there is nouthing to worry about save that money for when it u have a real problem

Posted on Mar 17, 2010

  • 2559 Answers

SOURCE: WHAT'S LEAKING? Is it the valve stem seals or piston rings???

If it is the valve seals,you can replace the head,but it would be cheaper to replace the seals,If you pull the head,you can do a leak down test on the pistons to check the rings as well.

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Posted on Jan 23, 2009

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SOURCE: 1988 Lancer, 5 speed, 4G15 engine. Blow by hose

This problem is usually the result of worn rings but since you already did that, then check the passage that the PCV valve is connected to. It might be clogged, causing a restriction. If that isn't it, then drill a hole at least a quarter inch in size in the top of an old valve cover filler cap and install it. Drive the vehicle and see if things improve. If they do, then check to make sure that you have the correct PCV valve installed.

Posted on May 22, 2011

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Rocam1.6 06 model uses oil sparkplug No2 gets wet with blk carbon, misfirin smokin white.If I change tht spark plug it goes well For3 days.Mechanic changed the rings after 6 weeks problem persists.hlp

The carbon suggests that oil is finding its way into that cylinder and oiling/carbonising the plug.

The mechanic changed the rings so it's doubtful that the oil is finding its way into the cylinder, past the rings. The only other thing I can think of is that the valve stem guide is worn (this would allow oil down into the cylinder) or the valve stem seal is perished/worn.

The photos below are generic images. They are NOT of your car:

26063798-uep1qeforvmfktksxbn30q5u-5-0.jpeg A valve in the valve guide. A worn guide can allow the valve stem to 'rock' and permit oil to trickle down the valve stem into the cylinder.

26063798-uep1qeforvmfktksxbn30q5u-5-1.jpeg The seal itself - rubberised.

There's many different types of seal. General image below just for illustration purposes:

Bluish smoke indicates that oil is being burnt in a cylinder. To be honest, worn valve guides/worn seals are quite common. You say your car is misfiring? That would indicate quite a lot of oil is fouling the plug. In most cases there would be no misfire after just 3 days. The exhaust would cough out bluish smoke at start up and maybe on the over-run, when going downhill.

A short term measure is to try a can of valve seal additive to see if the problem temporarily goes away. Repair is the best option though.

Try a can of valve seal? It's worth a shot..

Jan 22, 2016 | Cars & Trucks

1 Answer

Why would it only smoke at low rpms or at light then goes away soon as start driving at higher rpm

Valve stem seals are leaking and/or valve guides are worn, opening the seals and allowing oil to run down valve stem. When de-accelerating, oil is sucked down the valve stems, then blown out when you start off. If it smokes under acceleration, then piston rings are worn.

Jul 02, 2014 | 1996 Ford Thunderbird LX

1 Answer

Suspect valve stem seal caused smoking after being idle, replaced head gasket set and p'rings,t'belt, plugs, oil & air filter as there was no service history at 66,000 miles. fired up fine...

If it only smokes after you crank it up and then stops after it warms up usually that is the valve seals letting oil leak down in the cylinder after you cut it off .

Jul 03, 2011 | Daihatsu Charade Cars & Trucks

1 Answer

Blue smoke when starting frist thing in the morning

This usually indicates worn valve guides. When the engine sits for a period of time, the residual oil sitting in the cylinder head will seep down the valve stems past the seals and guide and into the cylinder. When you fire it up the little bit of oil burns off giving you the blue smoke. Usually clears up right away.

When the guides get worn and theres some play in the valve stem, it stretches the seals a little too so they nolonger seal very well and allow the oil to seep past.

You can replace the seals for a temporary fix, but will not last long as the play will stretch them again. Whats needed is a valve job. Not a quick fix. The valve guides need to be reamed and honed to resize them to fit the valve stems correctly to eliminate sideways play, then the valves ground and reseated and fitted with new stem seals.

Having said all that, if the smoke clears in seconds, you can keep going for a while yet. A little oil burn wont hurt much. As the wear gets worse the smoke will persist longer till it never quite goes away and you leave a trail behind you. Depending on your usage, (and how bad now) this could be 6 - 9 months away.
Hope I have helped.

May 23, 2011 | 2004 Hyundai Santa Fe

1 Answer

Hi my ford granada 2.8 carb 1984 started idleing rought and kicking blue smoke out just bought new head gasket set but the valve stem seals are tight and is that a problem danny

Blue smoke = oil is burned. You have an oil seal that is worn out so yes, the valve stem seals might be the ones. Replace them and check again.

Aug 04, 2010 | Ford Granada Cars & Trucks

1 Answer

Oil consumption and black ezhaust mercedes 280e 1984,compressy ok,sometimes ONE bougie fouled.

Compressor is OK meaning your valves are still good. However the Valve- Stem seals need to be replaced. The seals have function to limit the lubricating oil amount the valve train. When they are worn out, too much of oil gets in to the valve area then get burnt out to the exhaust causing oil consumption. These valve can be replaced at a shop without taking the head off the engine. Although it sounds simple but not all the shop want to do this, since they want to take the head out to make more money. So check around until you find one. The work is to put air compressor at the spark plug location to hold a valve up so the valve-stem seal could be replaced from above. This will be repeated for every valve on the engine. Although not being an auto mechanic, I did on mine and fount it was at medium level of difficulty. Good luck.

Mar 14, 2010 | 1999 Mercedes-Benz E-Class

1 Answer

A6 smokey on start up

If it's the org. engine it will has over 85,000 miles on it.
It's normal to has valve stem seal/oil seal on the head to leak oil into the cyclinder on high mileage engine.

The smoke you see is the motor oil drop from the valve stem seals. The oil drops land on the top of the cyclinders and it create black smoke at start up.

The inexpensive fix is to start using high mileage oil with seal conditioner.
This will help soften the rubber seals and help reduce internal oil leak.

The correct fix is to wait until it's time for a head gasket replacement and let the professional CRC/service the head.

Complete head service is the only method to stop this internal oil drip problem.

Jun 13, 2009 | 2002 Audi A6

2 Answers

Smoke from the exhaust when starting

I would think this is valve stem seals that are letting a little bit of oil down on top of the piston and when you go to start the car you get a bit of oil smoke when you start the car

Nov 30, 2008 | 1995 Jaguar XJ6

2 Answers

1993 TOYOTA TERCEL 1500cc Valve Seals Replaced now smokes much worse

You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.

Aug 23, 2008 | 1993 Toyota Tercel

1 Answer

Burning oil while decelerating

i agree it sounds like the valves stem seal need replaced

but also ya need to check your pcv system, and replace your pcv valve

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