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1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
 
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Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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In reply to this post by Gary Lewis
Well back to the cylinder head.
Using a ramp I managed to wrangle it up onto the bench. Still taking it a bit easy post op.  I put a straight edge across the tops of the rocker studs and I can see that at least three of them have lifted a bit. So I guess the thing to do is change them all out for the threaded studs to match the intake stud on number 3. The little alignment jig I made for tapping the threads will work for some of them and I will have to do something similar for the others. I have a set of the chevy rocker arms so I will see how that works out.
Bob near Winnipeg
1986 F250 Lariat extended cab 300 T18 2WD 1979 Honda CX500 1992 Oldsmobile 98 touring sedan 2007 F250 6.0 4wd |
Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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Glad you are taking it easy.
 As for the studs, do you plan to change them all out?
Gary, AKA "Gary fellow": Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
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Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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Well finished tapping all the rocker studs. The jig I had previously made allowed me to do them all except
for the two end studs. I made up a second jig and that took care of that. I am definitely a believer in the gold coloured tap I have been using. It was really easy to cut the threads and just as easy on the last hole as on the first.  I have started to clean the valves. They are cleaning up nice and the sealing faces appear to be in good shape.  To clean the valve guides I decided to try a piece of nylon rope that I had made lots of little cuts on causing the broken strands to work like a brush. Soaked in lacquer thinner and sawed back and forth in the guide it worked very well.  A bit more cleaning and I will be able to start lapping the valves.
Bob near Winnipeg
1986 F250 Lariat extended cab 300 T18 2WD 1979 Honda CX500 1992 Oldsmobile 98 touring sedan 2007 F250 6.0 4wd |
Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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WOW! You are doing such a thorough, and well thought out job.
Gary, AKA "Gary fellow": Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
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Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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This post was updated on .
Well finally got a chance to do a little more on this project.
Been tied up with spring clean up after that long winter and cutting the grass every 3 or 4 days. I have the cylinder head back together, I hand lapped the valves and all went well. I experimented with cleaning the ports with a concentrated lye solution and even without a lot of heat it worked surprisingly well . I pulled the manifolds out to get ready to clean them. The intake is very tarred up.    I will report on how the lye solution works out on cleaning the intake.
Bob near Winnipeg
1986 F250 Lariat extended cab 300 T18 2WD 1979 Honda CX500 1992 Oldsmobile 98 touring sedan 2007 F250 6.0 4wd |
Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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Administrator
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Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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I hope the lye works too.
I mixed up one cup of lye crystals with 2 litres (qts) water. Careful to add the lye to the water, when I mixed it up it generated quite a bit of heat. I carefully levelled up the manifold after blocking off the carb base and the vacuum tree. Poured in the liquid and I will leave it for at least a day. It is supposed to be 90F here tomorrow so that should help.   I will report how it works out.
Bob near Winnipeg
1986 F250 Lariat extended cab 300 T18 2WD 1979 Honda CX500 1992 Oldsmobile 98 touring sedan 2007 F250 6.0 4wd |
Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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Well I am really really happy with how well that worked. You can only use lye on cast iron and steel, but for those it is
superb. I let it soak for about 2 days, I had planned on putting a bit of heat to it but it reached almost a 100F here yesterday so I didn't bother. After letting it soak for two days I dumped most of the liquid into a pail and then flushed the manifold with hot water. Evil looking liquid that came out hope it works as a weed killer. Anyway below is a picture of one of the ports and the rest of the intake looks just as clean. The before picture for that port is a couple of posts earlier. 
Bob near Winnipeg
1986 F250 Lariat extended cab 300 T18 2WD 1979 Honda CX500 1992 Oldsmobile 98 touring sedan 2007 F250 6.0 4wd |
Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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That looks great, Bob.
Gary, AKA "Gary fellow": Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
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Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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Thanks Gary,
It's Alive! Working on it when other projects and weather would allow. Back together and runs beautifully. 19 - 20 inches vacuum at idle.   I chased all the threads and wire wheeled all the fasteners, cleaned all the surfaces etc. Used my crane to put the head and the manifolds back on. Made up a carb spacer gasket out of 1/8" nitrile - I think the temperatures are within its operating range. I installed chevy 292 rocker arms. Used the distributor rotor to tell me which cylinder to adjust the valves on. Zero lash + 3/4 turn. Checked for oil flow to rocker arms = good. Well that was definitely a learning experience. I had thought of trying to clean the gas tank but they are cheap enough I think I will just replace it.
Bob near Winnipeg
1986 F250 Lariat extended cab 300 T18 2WD 1979 Honda CX500 1992 Oldsmobile 98 touring sedan 2007 F250 6.0 4wd |
Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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  Congrats!
Jeff / 1984 F350 Crew Cab 4x4/5.8L w351 4V/ T18/ D50 4.10 front/ 8' bed.
Restored 2019-2022. Nicknamed «Big Brother 1984», due to its soooo-looong shape & nod to George Orwell's 1984 famous novel. |
Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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Administrator
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I prefer this one.
Congrat's!!!
Gary, AKA "Gary fellow": Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
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Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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 Gary, I didn’t know it was possible to post an animated gif! LOL!
Jeff / 1984 F350 Crew Cab 4x4/5.8L w351 4V/ T18/ D50 4.10 front/ 8' bed.
Restored 2019-2022. Nicknamed «Big Brother 1984», due to its soooo-looong shape & nod to George Orwell's 1984 famous novel. |
Re: 1986 F-250 XLT 6.9 idi C6 switch to 300 4 speed
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