Does anyone have a link, walkthru, or copy of a manual for this job?
My parents car is a mosquito fogger when it starts after it has been sitting. Plugs 2,4(I think) were oily.

Any help or advise is appreciated

 

Typically the seals are replaced by removing the head. However if the engine is otherwise OK it is possible to replace the seals with the heads on the engine.

You will need a manual. The factory is best buy Haynes is OK. Check your local library which may have service data. No manual will have info on replacing the seals when the head is still on the engine.

However at one time the internet had a detailed post about replacing the seals on a Toyota Supra which should be close enough for your engine. An internet search should find it.

A few pointers:

Mark everything such as how the two cam gears mate, valve shim location even if still on the valve assy. Use the markers auto salvage yards use that can write on anything. Use don't want to mix parts between valve assembles!

There are special tools to remove the valve stem locks but they can be difficult to use and require a lot of practice. Before removing the locks plug every hole in the head in case they get loose, you don't want them dropping into the engine.

The old seal can be a very hard to get off the stem. Take note of the special tool used, normal pliers, etc. will not work!

Some mechanics use compressed air to hold the valves up but the rope down the spark plug tube may be a better choice. The reason is you can stop work at any time and not be concerned about needing the air compressor being on.

Toyota sells the seals but they are expensive. Shop the internet for seals much more reasonable priced. Toyota uses different materials for the exhaust and intake. Use Viton seals which perform much better and allow the use of only one type of seal material.

This job takes a LOT of time! Plan on a long weekend even if you know what you are doing.

Find and read the Supra posts, then post back with your questions.

Since a good deal of the timing system will be taken apart this may be a good time to replace the belt. You will need to remove the cams thus the cam seals will need to replaced.

 

Is this the link that you were refering to ?
Valve Stem Seal Replacement on '93-'98 Toyota Supra Turbo

 

Yes, it's not the same engine but gives you an idea of what the process is.

The 1MZ-FE has the same shim setup and valve assy that is buried in the head. If you go with the rope, use a small tube with the rope inside to guide into the spark plug tube, then the plug hole.

Before you remove the cams from each head, make sure you understand their alignment so you can reorient them when installing. Don't forget the service bolt (the manual will explain this).

 

This long video shows the above process. It requires removal of the timing belt and camshafts to gain access. Could be a weekslong project for the average DIYer under ideal circumstances. Due to lifter bucket wear, replacing shims alone may not adequately address valve clearance issues.