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Bob is hurt...

Discussion in 'Engine and Drivetrain/Mechanical' started by tarafied1, May 5, 2017.

  1. tarafied1

    tarafied1 Well-Known Member

    The Bobcat has been running rough lately. I got home from Atlanta and had some time to look at it with him before I fly out tomorrow to Europe. It had low and fluctuating manifold vacuum. Played with timing and carb and just couldn't get it to smooth out. So I did a compression test. #1 60 psi, #2 30 psi, #3 150 psi, # 4 140 psi.
    Some time ago it sucked up crud in the carb and was running lean. Lean enough to melt an electrode on one of the plugs. I think it either burnt a couple valves or maybe even hurt some pistons. It's not blowing oil out of the breather or overheating so I hope it's just valves. I squirted oil in the hurt cylinders and checked again, Got the same numbers. Again I hope it's just valves. He is going to pull the head tomorrow. I called the machine shop and they said they could turn around the head in a couple days so we hopefully can get it fixed before the Hot Rod Power Tour.
    Not having good luck with all of our junk Fords lately.
     
  2. 6t6red

    6t6red Well-Known Member

    You will still beat Terry to the tour.
     
    tarafied1 likes this.
  3. tarafied1

    tarafied1 Well-Known Member

    I really hope he can get it fixed in time. He has been looking forward to driving it on the tour since he got it!
     
  4. Horseplay

    Horseplay Well-Known Member

    Pah-Leese! We're all gonna make it one way or another. My worst case is I run out of time and the stroker has to wait. But after the wallet drain I've been through the past few days on that thing no way in hell that happens.
     
    6t6red and tarafied1 like this.
  5. tarafied1

    tarafied1 Well-Known Member

    [​IMG][​IMG]
    It was two burnt exhaust valves


    Sent from my iPhone using Tapatalk
     
  6. rbohm

    rbohm Active Member

    it looks like you were starting to have head gasket issues as well.
     
  7. tarafied1

    tarafied1 Well-Known Member

    what do you see?
     
  8. rbohm

    rbohm Active Member

    in the second picture, you can see evidence of leakage starting around the fire ring between the cylinders, and above that you can see evidence of leakage between the transfer holes, note how the gasket is soaked around the holes.
     
  9. tarafied1

    tarafied1 Well-Known Member

    I think that's just from when we pulled the head. The head still had some oil in low spots that ran all over when we lifted it out of the engine compartment. Also some could be from me squirting oil in the cylinders for the second compression test to see if it was valves or piston/rings causing the low values.
     
  10. rbohm

    rbohm Active Member

    not between the cylinders. around the other side i agree, that is oil, but if you look between the two cylinders in the picture, you can see some browning of the fire ring. i have seen that way too many times to think any different.

    the good thing though is that you caught it soon enough that no damage has been done.
     
  11. tarafied1

    tarafied1 Well-Known Member

    it's quite possible. The cylinder temps had to be pretty high to burn the valves. Could have warped the head too. We'll have it checked. Thanks
     
  12. rbohm

    rbohm Active Member

    if the guy you take the head to is any good, the head gasket surface is the first thing he will check after disassembly.
     
  13. tarafied1

    tarafied1 Well-Known Member

    yeah, they are good. The head had some flatness issues already. When we bought the car the head was off. When we had the valve job done they had to mill some off to clean it up. I don't recall how much but my son has the receipt and the details are on there. The motor had chewed up the cam and had huge ridges on the cylinders. It was worn out! They had to bore it .040" to clean up the cylinder walls.
    I'm pretty sure the carb issues we had caused this issue. It was running real lean. After we got the carb cleaned up it ran better but not like when we first put it together. I was thinking we could have hurt the motor and suggested to my son to check compression but we didn't do it. My bad. He kept driving it to school and I got busy and we finally took the time to look into it. First thing I did was check compression. It was like I had feared. Hopefully the head isn't warped too bad, we can find lots of Ranger 2.3 engines but the heads are different. Hard to find carburated 2.3's
     
  14. tarafied1

    tarafied1 Well-Known Member

    my son got the head back. it was pretty bad. needed the seats too and even a couple intake valves
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
     
    Grabber70Mach likes this.
  15. tarafied1

    tarafied1 Well-Known Member

    the latest on Bob the Bobcat. My son got the head installed and mostly the engine is back together. he decided to wrap the header too. Looks like all he is waiting on is the confidence to hit the key (and maybe install the radiator). In the mean time he installed some gauges to monitor things a little more closely. (notice also the Holley is gone!) He bought a Street Demon.
    [​IMG]
    [​IMG]
     
    Grabber70Mach likes this.
  16. rbohm

    rbohm Active Member

    tarafied1 you keep making me long for my old 80 pinto.
     
    tarafied1 likes this.
  17. tarafied1

    tarafied1 Well-Known Member

    this is my 19 year old son's car. It is quite the project. Not what you might expect from a "youngin" these days!
     
  18. janschutz

    janschutz Corn Hauler

    I guess the next time I shoot a Bobcat, I need to send him the skin!
     
    tarafied1 likes this.
  19. tarafied1

    tarafied1 Well-Known Member

    lol, that would be something!

    He did get it running. He had to jet down the Demon. I think it will be a better carb for the 2.3. It is a lot like a Q-Jet, small primaries and big vacuum secondaries. It uses metering rods too which may not get clogged like the Holley did. It looks good on there too. He is still fine tuning things but it runs better now that it's back on on all four cylinders.
     
    RapidRabbit likes this.

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