intake and exhaust valve stem oil seal

[BAMBAMSR5]

has any one had a try at replacing the intake and exhaust valve stem oil seal on a 1KDFTV with out removing the head ?
i have been told it can be done by removing the glo plug and pumping compressed air in to the head to keep the valve in position.
any other methods out there ?

[toyboata]

Those are the only 2 methods to do it. Compressed air is obviously easiest and cheapest way. Take one plug out at a time and have that cylinder on top dead centre with both valves closed. After each cylinder is done, replace glow plug and move to next one. If you have all the plugs out at once the motor will spin when you pump air into the cylinder.

[bloke&tackle]

I have not done it on the Toyota engine, but have done it on various other engines.
You will need a valve spring compressing tool, there are several "universal" ones available but you take your chances as they aren't as "universal" as the term suggests.
The first time I changed valve stem seals I used compressed air, the engine won't spin if the piston you are working on is on Top Dead Centre. The trouble is that not all the cylinders will have TDC markings on the harmonic balancer and you need to be very accurate or the air pressure will spin the engine.
All the subsequent times I've done it i didn't bother with compressed air, on TDC the valves can't fall down any more than a few mm anyway before they hit the piston. With the new valve stem seal fitted the valve will stay up on it's own in order to fit the collets. Not using compressed air means you don't have to be accurate finding TDC, I just poke something down the injector or glow plug (or spark plug on a petrol motor) hole and "feel" for TDC.

[oldrev]

i'd have to ask why do they need replacing?
if the valve stem seals are stuffed i'd be wondering what else is worn and why.
guides/ seals / valve stems themselves?
it must have some work on the engine or something has caused it
ken

[BAMBAMSR5]

the engine has got 200000km on the clock on start up in the morning getting a bit of white grey smoke was thinking of doing the valve stm seals at the same time as i do the injector seals with out taking the head off would save me time.

[mattwhite]

Injector seals or injectors?

[BAMBAMSR5]

it runs fine no loud injector knock after starting will replace air filter and clean o2 sensor and take a look at the inlet manifold before taking to toyota

[oldrev]

the engine has got 200000km on the clock on start up in the morning getting a bit of white grey smoke was thinking of doing the valve stm seals at the same time as i do the injector seals with out taking the head off would save me time.

yeah mine has over 200thou on the clock also but that really only equals about 2500 hours .
thats not many hrs for a hi-tech engine
just a thought