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Thread: f100 - cams are out...

  1. 12-09-2023, 06:08 PM #11
    Rojo
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    Quote Originally Posted by Barnacle Bill View Post
    Looks like the bearings were turning in their seats. That happens when ran with no oil.
    [QUOTE=Slab;These cam bearings are not separately replacable. The whole head would have to spin! lol[/QUOTE]

    So like a Ford 5.4 3V Triton overhead cam engine the casting is the bearing. Although vertical Cams are used allowing oil to drain there is no combustion heat to melt the aluminum enough to transfer to the steel camshaft. The heat is just not there. That being said those camshaft bearing valleys in the head casting did Gall on the aluminum side. The Ebay castings galled even further. Ford repairs their head castings by Line-Boring the casting with the clamps in place then installs a new camshaft with .010 oversized journals for the repair. Its a one and done, you buy a new casting the next time. I happen to have one of those engines in my Fishin' Expedition. Respectfully speaking the case must be cracked, Crank & Rods checked for low or no oil operation too. Without doing that you may be pulling the head right back off along with the Powerhead. We may be able to find a complete block, I will call Tuesday as my guy is way too busy with oilfield customers on Mondays. I have bought a ton of good Yamaha F250-F300 used parts from him and all were good.
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  2. 12-09-2023, 07:41 PM #12
    Rojo
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    Just watched your latest video on YouTube and the Cylinders were certainly getting plenty of oil and fuel. I agree the pistons and Cylinders should be fine. My comes in with the Seizure, if a piston didn't grab enough to stop the engine from turning I don't believe your Camshafts, with the little damage to the Head Casting stopped the Engine. I will log in and see what a full gasket set costs and PM you that figure. A blown Head Gasket didn't cause it to seize either. If you look in the manual I sent the valves are loaded with spacers and they will all be different. Don't take the head apart without reading that section in the manual first. If they ran it hot the Cylinders will still look fine but the rings will have lost their tension. I bought a 175 Eagle engine for my stash for $800 due to that. Great buy for me as I collect 60 Degree engines.
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  3. 12-09-2023, 07:46 PM #13
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    The 3.5 liter engine in my Tacoma has the same configuration as well as the Eco Boost engines I have seen. That seems to be the trend in engines now.
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  4. 12-09-2023, 07:50 PM #14
    Rojo
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    Name: 500-336_202063014401.jpg Views: 64 Size: 41.9 KB

    Does this look like your gasket set?
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  5. 12-09-2023, 07:52 PM #15
    Rojo
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    We can get individual gaskets too. Those in the picture. Said they fit a Mercury Engine too why I'm asking for verification on application.
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  6. 12-09-2023, 08:19 PM #16
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    The head gasket looks the same but the intake manifold gasket seems slightly different.

    Name: IMG_0437.jpg Views: 63 Size: 115.0 KB

    Also, upon further inspection, I found something on the bottom cylinder wall. Here you can see it. You can also see that I scratched it with my finger nail.

    Name: IMG_0442.jpg Views: 61 Size: 73.1 KB

    So I’m thinking there was some metal transfer. That’s the only place I found it.


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  7. 12-09-2023, 08:38 PM #17
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  8. 12-09-2023, 08:57 PM #18
    Rojo
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    You sure that's not coolant water? Was it run in Saltwater? The heat from the cylinder with coolant leakage will leave deposits. Aluminum transfer you can see, its sickening to those who don't know the acid trick. I'm not there but if a little white Scotch-brite removes it not to worry.
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  9. 12-09-2023, 09:02 PM #19
    Rojo
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    If you look in the service manual the tab on the Intake gasket will need to either go up or down. I see the tab is on a different hole but still pointing off the end of the gasket. Head gasket looks the same too. I'm looking up the prices now so you have comparison figures if nothing else.
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  10. 12-09-2023, 09:24 PM #20
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    Yep, it was run in the salty stuff. I’ll see if it cleans off tomorrow. Thank you for all your insight and help. It is much appreciated.


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