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Old 02-23-2007, 08:25 PM   #1
unkymurch
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Default 1986.5 Non-Turbo with blown Head Gasket - Removing Spark Plugs

Advice needed for how to remove all the spark plugs.

I put my sputtering 1986.5 Supra with a blown head gasket in the garage until I figured out what to do. After just a few weeks, I tried to restart it a few days ago, but it was a NO GO.

I was told to remove the spark plugs and cycle the motor to blow out the coolant that may have filled the chambers and then it would restart.

I can see and touch three plugs but three are underneath all the mechanisms of the engine.

What is the minimum I have to remove to gain access to the hidden three spark plugs? It's very intimidating too see how much has to be removed to get all the plugs out.

Is there some free internet diagrams or procedures with pictures that would tell me how to do this? I have a Toyota Shop Manual but it is useless in explaining how to remove the spark plugs.

Any advice and words of wisdom would be appreciated.

Thanks,

Mitchell

Last edited by unkymurch; 02-24-2007 at 02:31 PM. Reason: Specify it was a Non-Turbo Supra
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Old 02-23-2007, 11:19 PM   #2
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i would drain some motor oil to see if water comes out first before the oil

oil floats ontop of water


this will give you some kind of indication of how much of a blown gasket you are dealing with

i wouldn't start it just for ha ha's
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Old 02-24-2007, 01:59 AM   #3
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the mininmum youd have to remove is the throttle body. go here and it will tell you how to remove it. or do what i did and just go figure out how to take it of...took me about an hour the first time. just make sure to take pictures so you can have a reference for when your putting it back together. it may seem daunting but its really not once you get into it.
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Old 02-24-2007, 04:39 AM   #4
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"Advice needed for how to remove all the spark plugs"

Is it turbo or non-turbo?

And if you are afraid of taking stuff off to get at the plugs, if you are replacing that blown head gasket, you're in for a rude awakening .
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Old 02-24-2007, 05:31 AM   #5
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well, i went on the assumption that it is not turbo since they didnt make em in 86.5, but if its been switched you will have to remove other stuff
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Old 03-02-2007, 01:08 AM   #6
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Any chance there are pictures or even a video clip of what to remove to be able to access the spark plugs. Taking BEFORE pictures is wise advice and I'll do that, but I'm afraid of taking or dismantling too much or maybe not enough.

Is not, perhpas I should make my own.

Mitchell
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Old 03-02-2007, 01:48 AM   #7
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i dont have any right now...and we're in a tornado warning right now so i dont know what the weather will be like tomorrow, but ill try and get pictures asap.but if someone else has them feel free to post, dont wait on me.
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Old 03-02-2007, 04:57 PM   #8
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Take off whatever is in the way of the plugs, its not hard. Find the bolts/nuts that attach the parts, they will be either 10mm or 12mm, a few might be 14mm. Take off any hoses/vacuum lines that are in the way with channel lock pliers on the clamps. Disconnect any electrical connectors that are in the way. I only have pictures of a turbo tear down so I guess that won't help you. If yours is non turbo, you will need the air intake connector gasket available at any local parts store, most likely it will not be in stock so order it before you start dismantling. That's the pipe that the throttle body bolts to, its attached to the upper intake manifold by 4 bolts and 2 nuts.

Heres what you need-



Open the hatch and use that as a place to store the parts you take off and keep the bolts in order. Label the hoses with masking tape and a marker. Clean all the bolt threads with a wire brush and clean all the gasket mating surfaces with brake cleaner. Remember, these parts are aluminum and will be damaged easily so be careful if you have to scrape old gasket material off.

Just take your time, do not rush and you should be successful.

Last edited by IHateHacks; 03-02-2007 at 05:01 PM.
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Old 03-02-2007, 05:13 PM   #9
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Don't over tighten the bolts going into the intake manifold because they are aluminum, they will snap and make your problem much worse. Its not hard, just dive into it. There are 3 bolts on the y pipe (intake plenum) that the throttle body is connected to. Just take those off and make note where the vacuum hoses go. You might want to use some kind of extension for the bolts on the bottom of the intake plenum. They are a little bit of a pain but nothing that bad. And make sure you grab those otherwise they'll drop onto the lower intake manifold and you'll either have to be really good with an extendable magnet or take off the upper intake manifold to get to them. I've done this so many times I can do it in like 5 mins. lol.
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Old 03-02-2007, 05:19 PM   #10
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Those 4 bolts and 2 nuts should be torqued to 13 ft/lbs.

The proper name for that "y-pipe" is the air intake connector. Which attaches to the intake manifold with 4 bolts and 2 nuts. See the 6 holes in that gasket in that picture?

Even the throttle body uses 4 bolts, so I do not have a clue what part you are speaking of that uses only 3 bolts.
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