86 cobra 4.3 20drg.s to hot

[Lou C]

Re: 86 cobra 4.3 20drg.s to hot

I copied your pic and showed you where to spray some silicone spray so that you can slide down that lower hose on to the Y pipe. That hose has to slide down before the manifold will come off. Once you get that lower hose down the manifold will come off easily and then you can remove the upper hose and the aluminum exhaust pipe with it. Then check the outlets for rust clogging. As clean as that engine looks and fresh water use, I'd be a little surprised if they were clogged....

 

[MRS]

Re: 86 cobra 4.3 20drg.s to hot Update

Re: 86 cobra 4.3 20drg.s to hot Update

OK got the bellows down just now so I am ready to pull manifold tomorrow night. I can see the shutter in there looks good once manifold is off can also check the power steering cooler and clean out since I am there. I did run a wire up into the manifold and ton's of junk did fall out. Here is where i am at now.

 

[MRS]

Re: 86 cobra 4.3 20drg.s to hot Update

Re: 86 cobra 4.3 20drg.s to hot Update

Lou, just saw your reply Thanks I should be getting gaskets nuts and washers tomorrow. I did run a wire up the manifold drain and a bunch of junk fell out will update when I get manifold off Thanks again for the help so far.

 

[Lou C]

Re: 86 cobra 4.3 20drg.s to hot Update

Re: 86 cobra 4.3 20drg.s to hot Update

When you have em off, look in the exhaust ports on both the engine and the manifolds, if you see any signs of rust trails it's time to replace them. I doubt it because of the freshwater use, but they are the OE ones, I can tell by the 4.3 stickers. You can also hook up a water hose to the inlet while you have em off and check the flow out of the 4 exit ports.
Look at my pic of my engine above, see how all there is in the ex ports of the engine is carbon? You should not see rust there.

 

[MRS]

Re: 86 cobra 4.3 20drg.s to hot Update

Re: 86 cobra 4.3 20drg.s to hot Update

OK they are off look not to bad nothing like the photos of yours will soak with iron out solution tomorrow and rinse out. will also check cooler and make sure not plugged did notice the line from cooler has a flat spot where it was smashed against the exsahaust manifold bellows will also check that tomorrow. Did run water and it did run through all four port holes. Man I am dieing to get this thing back on the water.

 

[Lou C]

Re: 86 cobra 4.3 20drg.s to hot Update

Re: 86 cobra 4.3 20drg.s to hot Update

I saw that same flat spot on my raw water intake hose, I think what you have to do is slightly re-position the cooler, there is a tough to get at nut and bolt that hold it on the bracket bolted to the engine...I was not able to move it for fear of breaking the bolts, but actually it was not causing any of my hot running issues, they were caused by the manifold clog and also barnacles growing in the water intakes. Yes here in salt water if you moor your boat, you will find barnacles growing in the water intakes, even in fresh water boats that stay in the water, you can get zerbra mussels doing the same thing....

 

[MRS]

Re: 86 cobra 4.3 20drg.s to hot Update

Re: 86 cobra 4.3 20drg.s to hot Update

Ran iron out through manifold tonight got more stuff out and seems to be running more water out of the ports. Will run more iron out tomorrow night and check cooler to make sure not plugged getting closer.

 

[MRS]

Re: 86 cobra 4.3 20.dg.s to hot Update

Re: 86 cobra 4.3 20.dg.s to hot Update

OK soaking manifold again p.s. filter good no clog there here is what I got out before first soak with iron out.

got about that much more out with first soak ten more min's and will flush and see what come's out on second flush.

 

[sam60]

Re: 86 cobra 4.3 20.dg.s to hot Update

Re: 86 cobra 4.3 20.dg.s to hot Update

OK soaking manifold again p.s. filter good no clog there here is what I got out before first soak with iron out.

got about that much more out with first soak ten more min's and will flush and see what come's out on second flush.

Be careful with iron-out. I love the stuff and have used it on non boat things as well as my manifolds. It's aggressive and doesn't always know what you want to get rid of and what you want to keep. Don't leave it in there for too long.

Looks like your manifolds are cleaning up nicely!

 

[MRS]

Re: 86 cobra 4.3 20.dg.s to hot Update

Re: 86 cobra 4.3 20.dg.s to hot Update

Thanks for the warning never used before seems to be doing the job. I leave in about hour then rinse did it twice second time everything really flushed clean so done with iron out hopefully good to go now.

 

[Lou C]

Re: 86 cobra 4.3 20.dg.s to hot Update

Re: 86 cobra 4.3 20.dg.s to hot Update

WOW that's a lot of Fe2 (iron!)...
One thing to keep in mind....all that rusted iron....used to be the inside walls of your manifolds...so they are getting thinner...and eventually rust through....my engine is on its 3rd set, the OE set was on it and hadn't leaked when I first got it but I knew they were 14 years old then and while the boat came from freshwater (Indiana) it was used in salt at least the past 5 years before I got it. I put a new set on in 2004 and you saw that those looked like in my pix. I changed those last spring. Now the ones I took off last spring showed no signs of water in the exhaust gas passages or ex ports in the head, but who knows how close you are to a rust through.

Problem is, those one piece units are not made anymore. There are 2 piece conversions using OSCO manifolds and risers, not cheap but better than ruining an engine.....keep in mind yours are OE so they are 26 years old......

 

[MRS]

Re: 86 cobra 4.3 20.dg.s to hot Update

Re: 86 cobra 4.3 20.dg.s to hot Update

Lou, I agree with you on the manifolds I want to run this season and change out next season. I think it was GLM makes a set that go's for about 600 bucks but like you said do not want to ruin a motor. Hope to get together this week and test next weekend been working alot and working on boat when I have enough daylight after work.

 

[MRS]

Re: 86 cobra 4.3 20drg.s to hot

mzahn, Thanks hopefully this will do it! Hope you have a great time at Mead when you go.

 

[MRS]

Re: 86 cobra 4.3 20drg.s to hot

Got off early today to put manifold on but wind is blowing hard So cannot do with all the dirt and grud blowing around. Do you guys put gasket on dry or with stuff on it? Almost there Thanks again....

 

[bruceb58]

Re: 86 cobra 4.3 20drg.s to hot

Manifold to the engine is put on dry. Just the gasket is needed.

 

[MRS]

Re: 86 cobra 4.3 20drg.s to hot

Thanks soon as wind dies down can get to it. Wish I had a huge barn to work on my stuffp

 

[bruceb58]

Re: 86 cobra 4.3 20drg.s to hot

Thanks soon as wind dies down can get to it. Wish I had a huge barn to work on my stuffp

You might be able to work on it on Sunday then!

 

[MRS]

Re: 86 cobra 4.3 20rg.s to hot question?

Re: 86 cobra 4.3 20rg.s to hot question?

My old gasket is metal looks brand new. New gasket is not metal should I use old metal one or new one made of gasket material. no junk on block or manifold.

 

[MRS]

Re: 86 cobra 4.3 20rg.s to hot question?

Re: 86 cobra 4.3 20rg.s to hot question?

Never mind that last dumb question thought about it Changing Now.:facepalm:

 

[MRS]

Re: 86 cobra 4.3 20rg.s to hot question?

Re: 86 cobra 4.3 20rg.s to hot question?

OK No go got manifold back on nice and clean still running hot. Hit everything with ir gun temp looked good except at the thermostat housing where it heads to the water pump big hose was 190 and the water pump showed 190 also. Where the thermostat sits showed 160. So it looks like a new water pump on the motor might be needed going out to pull and check does that sound about right?