I had oil in the spark plug tubes of my '89 SV21, and I hear it happens often with all engines designed this way. I researched it and had a go at fixing it. I read a lot of posts describing the procedure but there were very few actual photos. So here are some I took. Hope they help you if you are attempting this job on their own. It's not too hard.
A 30mm socket is required to remove the four nuts holding the rocker cover on. Vice grips worked unscrewing the tubes.
You want to clean the thread and re-seal the bottom of the tubes with a high temp sealant, and replace the seals at the top of the tubes. A set of these was $25 at Repco.
Kind regards, rubber.

 

Great job, thanks for the post and photos!

 

Great photos; makes perfect sense now, Thanks so much.

 

Great, so it was worth posting the pictures! Glad to help. Might put up the pictures of my CV boot change next...

 

except that there's likely 2nd set of seals in the middle of rocker arms assembly towers and they will still leak, if not replaced. At least, Hondas do for the years, and best I know, they are all made based on same philosophy for the period, so Honda had it - most likely, Toyota did too.
and if I'm wrong - amen and great post.

 

Spark Plug Well Oil Leak Fix, Honda Accord - YouTube

 

Thanks ukrkoz, ta for the info!

rubber

 

I just viewed the Honda video mentioned in previous post. The Camry spark plug towers can actually be screwed out of the engine. They are threaded tubes (see photos in first post) and it is the thread which caused my leak. The Camry doesn't have the second set of seals like the Honda.

Cheers, rubber

 

Great. But I am not talking about spark plug tubes, I am talking about engine head "towers" that have rocker arm assembly on them.
But hey, don't have it - amen, one less headache.
So, what exactly seals those spark plug tubes where they screw into the engine head? Threads leak oil very easy.

 

High temp sealant. : )