Well, thats not good...finally working on the 66 again

831 Views 5 Replies 3 Participants Last post by BadlandsGhost, Jun 3, 2009

BadlandsGhost

Discussion Starter · Jun 1, 2009

Apologies for the vagueness of the title, figured I'd save the surprise...
My poor '66 289 has been languishing in automotive limbo for the last few years, Since it lost half the compression on the #5 cyl (and developed a "pinging" that sounded like the fan tapping the fan shroud). At the time I checked the timing, ok, but the plug kept coming out covered in oil after only a few cranks. I figured the rings let go, and just put her away until the financials were a little better.

Well, I finally dug in to see what had happened, and it aint pretty. all the other cyls looked pristine, but #5, well, not so much. No sign of valvetrain damage, but the piston is hosed.
There were actual pieces of metal ratteling around the cyl, and the face of the piston looked like a mad welder had gone at it. (that is not carbon buildup, it is actual slagged metal)

The weird thing is, there was never any knock, running hot, damaged plugs, etc. It did feel a little down on power, but I figured that was my lack of carb tuning skills.
Any idea why this would just happen on just one cyl? I mean, if it was way lean, shouldn't there be some damage to the other cyls?

and (possibly) unrelated, while pulling things apart, I noticed the #1 rocker had a different sized nut on it than the others, makes me wonder what other half arsed stuff might be hiding under there..

As Holmes might say (were he a gearhead) " A rebuild is afoot!"
Sigh...
J

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Veronica

· #2 · Jun 1, 2009

Hi Jorge.

How have you been? Hopefully much better than your motor. :gringreen If everything else is basically ok except for that one cylinder the rebuild shouldn't be too awfully bad. That would run you something in the 1500 range around here, but, prices on that vary considerably from one area to the next. I was in Gatlinburg last summer for a couple of weeks. We were at a place called the Blue Moose in Pigeon Forge, then went cruising around a little and I saw that home depot. I thought about stopping in, but remembered that you worked nights, so, I didn't. I did wave at you, though.

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BadlandsGhost

Discussion Starter · #3 · Jun 1, 2009

Veronica said:
Hi Jorge. How have you been? Hopefully much better than your motor. :gringreen

Well, I'm still running at least, so I guess I'm on the plus side of the equation, LOL.

Veronica said:
If everything else is basically ok except for that one cylinder the rebuild shouldn't be too awfully bad. That would run you something in the 1500 range around here, but, prices on that vary considerably from one area to the next.

Well, I'm not wanting to go for the "quick n cheap" approach (I'm afraid someone else already has), but saving is always good. My original plan was to score a rebuildable 302, and swap it into my 93, then use that core to build a stroker for the 66. I guess now I'll just rebuild that one and try to beef it out.

Veronica said:
I was in Gatlinburg last summer for a couple of weeks. We were at a place called the Blue Moose in Pigeon Forge, then went cruising around a little and I saw that home depot. I thought about stopping in, but remembered that you worked nights, so, I didn't. I did wave at you, though.

LOL, I know of, at least, the "moose", havent had time to check it out myself. And since they've gotten rid of night crews for most of the stores, I now do a swing shift, 3-12 or whenever things are done, running the freight crew..And thanks for the wave:wavey

Any ideas why things would be bolluxed on just that cyl? I'm winging it at this point.

Thanks, J

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Veronica

· #4 · Jun 1, 2009

Hi again.

I have no idea what would cause that, assuming that you haven't dropped something down the carb when the motor was running. It looks like some kind of C clip or snap ring or something got sucked in., but, I really don't know.

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PaulS

· #5 · Jun 1, 2009

BadlandsGhost said:
Apologies for the vagueness of the title, figured I'd save the surprise...
My poor '66 289 has been languishing in automotive limbo for the last few years, Since it lost half the compression on the #5 cyl (and developed a "pinging" that sounded like the fan tapping the fan shroud). At the time I checked the timing, ok, but the plug kept coming out covered in oil after only a few cranks. I figured the rings let go, and just put her away until the financials were a little better.

Well, I finally dug in to see what had happened, and it aint pretty. all the other cyls looked pristine, but #5, well, not so much. No sign of valvetrain damage, but the piston is hosed.
There were actual pieces of metal ratteling around the cyl, and the face of the piston looked like a mad welder had gone at it. (that is not carbon buildup, it is actual slagged metal)

The weird thing is, there was never any knock, running hot, damaged plugs, etc. It did feel a little down on power, but I figured that was my lack of carb tuning skills.
Any idea why this would just happen on just one cyl? I mean, if it was way lean, shouldn't there be some damage to the other cyls?

and (possibly) unrelated, while pulling things apart, I noticed the #1 rocker had a different sized nut on it than the others, makes me wonder what other half arsed stuff might be hiding under there..

As Holmes might say (were he a gearhead) " A rebuild is afoot!"
Sigh...
J

Well J, look at the screws that hold the throttle plates to the shaft. If any are missing you know where they went. If that is not the case then the metal came from somewhere else. Check it over close as you disassemble it but don't be too surprised if you never find where it came from, just be sure it doesn't happen again on the new engine.

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BadlandsGhost

Discussion Starter · #6 · Jun 3, 2009

Thanks Paul, I hadn't thought about that, I'll check the carb this weekend. The only other thing I can think would be if one of the rings let go (don't know how likely that would be).
It started doing this out of the blue, I hadn't worked on it or anything, and it was fine one day, pinging the next. :headscratch:

Thanks again,
Jorge

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Well, thats not good...finally working on the 66 again

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