300 Inline 6 Rebuild Pics

Discussion in 'Shop Talk' started by VarmitSniper, Apr 13, 2010.

  1. VarmitSniper

    VarmitSniper Pyromaniac Weaponologist

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    Pacific Northwest
    Bought an '80 Ford F-250 awhile back with a nonrunning inline 6. Asked a few questions around here and got some good advice. Decided a rebuild was in order. Found severely worn bearings and camshaft, all the top rings were broken and the cylinder head was cracked.

    http://www.facebook.com/album.php?aid=11492&id=1746466458&l=2dc8a03f18

    Got new:
    Head
    Valves
    Bearings
    Rings
    Camshaft
    Cam gears
    Lifters
    Clutch pad
    Throw out bearing
    Water pump
    Oil pump
    Alternator
    Voltage regulator

    Been working on it for the last couple of months and finally finished it.
    Got it all back together on Saturday with the help of a couple of buddies. Started immediately on the first try, and we took it out and began the break in. That thing sounds REAL nice! Got a strong 4 speed tranny with an NP205 T-case, Dana 44 front and 60 rear.
     
  2. dezingg

    dezingg Well-Known Member

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    west central California
    Clicked through your pictures. It sure looks nice now! Enjoy.
     

  3. mightybooboo

    mightybooboo Well-Known Member

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  4. clovis

    clovis Well-Known Member

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    NICE!!!!!!!

    It is really enjoyable to see someone do a job right, from start to finish, leaving no detail undone.

    Nice, very nice!!!!!

    Thanks for sharing!!!!!
     
  5. haypoint

    haypoint Well-Known Member Supporter

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    I'm a bit suprised you reused the pistons. Early pictures seem to show some ridge at the top of cylinders, but later it looks like the cylinders are perfectly honed. If you have ridge there, that means the rest of the cylinder has worn and a bore job is required, so the pistons have to be oversized to match. Did you check the end gap in the rings at different places in the cylinder (without a piston)? Biggest cause of broken top rings is carbon build up on a cylinder ridge. Since your rings were broken..... Sometimes when a ring breaks, it damages the ring's land in the piston (the piston ring groove). Did you take a good hard look at that?

    You are going to have that flywheel honed?

    i did a 300-6 rebuild a few years back. I put an aluminum intake from Clifford that takes a holley 4 barrel carb. I also got their headers that go into two outlets for dual exhaust. I put a RV camshaft, made to increase pulling power, and stronger valve springs. I had to bore it out and put oversized pistons, so I found pistons for a different engine, that matched pin diameter and deck height, but were flat top, so the compression is a bit higher. I can't recall what engine those pistons were for, a Dodge 340, possibly.

    But I never found a truck to put it in and the engine has just been sitting. Around here those 300-6 engines out last the salt ravaged bodies.

    Thanks for posting the pictures.
     
    Last edited: Apr 14, 2010
  6. agmantoo

    agmantoo agmantoo Supporter

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    I have to ask, did you get those rod caps matched back to the specific rods from which they were removed?
     
  7. VarmitSniper

    VarmitSniper Pyromaniac Weaponologist

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    Location:
    Pacific Northwest

    The worst ridge was cylinder 1, and that was only 2 thousandths deep. So I cut the ridge, honed and miced the bore and they were well within tolerance.
    Got oversize rings and gauged them at the top of travel and at the bottom, they all passed as well.
    The reason for the carbon buildup was a leaking headgasket, the truck was eating oil like crazy when I got it and had been for several years.
    The ring grooves were fine as well, I cleaned them and gauged them.
    The flywheel was off a different engine which only had 26,000 miles on it so the wear was pretty minimal.

    Yep, numbered them.
     
  8. michiganfarmer

    michiganfarmer Max Supporter

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    I sure like those straight 6s