Got oil on top of your spark plugs??

[dannydavi]

your route does seem the best, didnt mean to open up a can of worms, but what you just said did clarify for me where the oil was coming from, and the options to stop it. thanks.

[IHateHacks]

Glad I could help!

Sorry if I sounded harsh, sometimes I come off that way.

Some people just need things broken down for them "Mr. Potato Head style"

[dannydavi]

mr potato head helped teach me the most efficient way to put together broken plastic objects, I hate hacks teaches me the most efficient way to fix
malfunctioning supra objects

... So whats the part number for the gaskets you used around the 14mm allen bolts? lol j/k thanks alot man.

[demon2supra]

is that the head bolt themselve and with that fact would that cause a little oil drain in the cylinders by morning start up?

Originally Posted by IHateHacks

Hopefully this gets sticky'd. There seems to be some debate over WHERE the oil comes from. I'm here to settle this once and for all, as I am tired of replying over and over again to this simple problem that anyone can repair very easily.

First of all, many DOHC engines have spark plug well seals. This, however, is not the case on the 87-92 7M engine.

Please refer to my custom diagram. When it says (color, shape) that is what I'm talking about. Pretty straight forward.



If you have oil here (green arrows) then it is possibly coming from 2 places. Everyone says, "It's coming from the valve cover gaskets" (red boxes) which, I too thought when I was new to supras. So I replaced the valve cover gaskets, yet the oil was still "appearing" in the spark plug gallery. Not as much as before, but it was still appearing. No track marks from where it was coming from, just a puddle. It was very frustrating. I then discovered (through no help of any forum, they all said it was valve cover gaskets) that the No. 3 cylinder head cover BOLTS (yellow circles) were leaking. They are 14 mm allen head. You can A. Go to the dealer and get a new No.3 cylinder head cover (its a cover AND a gasket all in one, bad design) or B. bring 1 of your 14mm allen head bolts to an auto parts store and match up an oil drain plug gasket that fits. That's what I did, I used red ones (yellow circles), cuz it matches the red lines on the valve covers.

Hope this helps.

[twerb089]

could oil also be coming from the three 14mm allen bolts that are right next to the spark plugs??

and also is it necessary to have the no3 head cover on or can you run with out it?

thanks for the post, im having this problem and i didn't know what it was till i found this thread.

[IHateHacks]

Those 3 14mm allen head bolts right next to each set of spark plugs (1 0 1- 1 0 1- 1 0 1, 1= spark plug 0= 14mm allen head inbetween the plugs) hold coolant. Do not take those out unless you have coolant in your spark plug wells. I've never seen or heard of those 3 leaking though, so I wouldn't worry about them.

The no.3 cylinder cover is a gasket so you can't just take it off without using either another no.3 cylinder head cover or oil drain plug gaskets.

[twerb089]

okay cool, just wanted to double check.
thanks a bunch man, now i dont have any oil on top!

[godgaveussid]

does this apply to oil on the spark plug tip? the other day my ghetto rigged ic piping popped off. car ran super rich for about 20 feet until i could get to a gas station. after that, car was hesitating under load, thought it was knock so retarded the timing alot...no help. by proccess of elimination, must be a fouled plug right? went and dropped $70 on denso iridium plags and but them in. when i took the old shitty autolites out, plug #6's tip was covered in oil. it was kinda hard to tell where on the plug the oil was since my buddy kinda smeared it with his fingers. first time under load after denso install...same hesitiation. now, i dont have the spark plug socket with me right now but im pretty sure when i pop #6 off tomorrow, it will have oil on it. does this stickey apply???? thanks.

[Spudboy]

What is this (shinny silver) 1st picture? Drivers right, lower front of block.

When I was disconnecting wires this plastic grey cap came off the "What is this" very easy. The wire and it's connector underneath doesn't make sense to me as to how or where it connects.

[Spudboy]

Originally Posted by IHateHacks

Let me know when your head gasket blows, I got all the part numbers you need buddy.

I'll take that list of BHG part numbers. I just got mine apart. Will start re-assembly soon.