Author Topic: Six Pack issues and rebuilding  (Read 59127 times)

Offline 72cudamaan

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Re: May have over revved the engine- fuel issue?
« Reply #15 on: February 03, 2014 - 12:30:03 am »
I'd be awfully careful about cranking the engine over as well. That much fuel could have hydro locked a cylinder. Then you have a real big problem.
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Offline cudabob496

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Re: May have over revved the engine- fuel issue?
« Reply #16 on: February 03, 2014 - 10:45:11 am »
I'd be awfully careful about cranking the engine over as well. That much fuel could have hydro locked a cylinder. Then you have a real big problem.

what does hydro locked a cylinder mean?
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline spamtank

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Re: May have over revved the engine- fuel issue?
« Reply #17 on: February 03, 2014 - 11:25:11 am »
Normally, you are compressing an air fuel gaseous mixture which is compressible.  Liquid fuel is incompressible, and the pressure that builds up is tremendous when the piston tries to compress the volume by a ratio of 10 to 1.  This results in bad things happening. 

Rick, Manchester, NH
1970 SE 383 2V AT Challenger
1977 M882/W200 Power Wagon
2013 RT Plus 6M


Offline tommyg29

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Re: May have over revved the engine- fuel issue?
« Reply #18 on: February 03, 2014 - 05:36:09 pm »
after sleeping on it I think one of the carbs (probably the front because some fuel did come out when I removed that sight plug) was stuck, and the electric pump just filled the cylinders and then then the intake manifold and into the vacuum line to the brake booster, and probably some if not a bunch into the crankcase.
Correct me if Im wrong but what I will do next is remove all spark plugs, drain the oil, try to suck any fuel out the brake booster with a tube, and then put some cheap oil in the engine, and then turn the engine over a few times without plugs (and maybe check compression while Im at it) with the ignition disconnected and electric fuel pump off to circulate a little oil with some flushing action. Then put plugs back in, reconnect everything and try to start it up. And VERY soon after change the oil again.
Of course, I need to also check and repair the carbs.
Sound OK?

PS
What does holly charge for their six pack rebuild/restore service?
« Last Edit: February 03, 2014 - 05:39:00 pm by tommyg29 »
72 Roadrunner 400-4 Auto-3.23 Gear-Black Cruiser
71 Cuda 440-6 Tribute-Limelight-A833 Close Ratio-4 Sp-Pistol Grip-Dana 3.54 Powr Lok-Rally Dash-Shaker (Sold)
92 Dodge Stealth RT-Twin 15g Turbos-SAFC2 Tuned-Mystic Blue-5 Sp-AWD-Rear Wheel Steering-AutoX'r (Sold)
12 Dodge Charger SXT Plus Blacktop Package-3.6L-8 Sp-Leather-Nav (the wife's)

Multiple SRT's, Rams, Dakotas, Caravans and Neons

...the lines on the road just look like dots!....

Offline Chryco Psycho

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Re: May have over revved the engine- fuel issue?
« Reply #19 on: February 03, 2014 - 06:03:06 pm »
pull all the plugs , bump the engine over slowly , get all of the fuel possible out of the cylinders , after most of the fuel is out you can crank it over to get the rest out , change the oil , wash the plugs off with brake clean or replace them then you can get after the carbs & clean the needle & seats out & get the float levels set

Challenger - You`ll wish You Hadn`t

Offline erat340

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Re: May have over revved the engine- fuel issue?
« Reply #20 on: February 03, 2014 - 06:16:35 pm »
Perhaps do this , carefully. Pull all 3 sight plugs, key on (dont crank), momentarily! See if fuel starts to flood from any bowl--Key off.

Offline HP_Cuda

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Re: May have over revved the engine- fuel issue?
« Reply #21 on: February 03, 2014 - 06:21:43 pm »

Since the fuel doesn't do great things for cylinders I'd pull the plugs and add some oil to it so it's not just flushing out fuel.

But depending on how much fuel you are pumping out you will probably be okay.

B
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD

Offline cudabob496

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Re: May have over revved the engine- fuel issue?
« Reply #22 on: February 03, 2014 - 06:34:18 pm »
Dang, seems like a good reason not to have an electric fuel pump??
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline tommyg29

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Re: May have over revved the engine- fuel issue?
« Reply #23 on: February 03, 2014 - 11:10:24 pm »
Thanks for the great advice. Will be picking up some new champion plugs (RJ12YC) and having a busy weekend.
Hopefully I didnt break or bend anything.  :banghead:
72 Roadrunner 400-4 Auto-3.23 Gear-Black Cruiser
71 Cuda 440-6 Tribute-Limelight-A833 Close Ratio-4 Sp-Pistol Grip-Dana 3.54 Powr Lok-Rally Dash-Shaker (Sold)
92 Dodge Stealth RT-Twin 15g Turbos-SAFC2 Tuned-Mystic Blue-5 Sp-AWD-Rear Wheel Steering-AutoX'r (Sold)
12 Dodge Charger SXT Plus Blacktop Package-3.6L-8 Sp-Leather-Nav (the wife's)

Multiple SRT's, Rams, Dakotas, Caravans and Neons

...the lines on the road just look like dots!....

Offline Chryco Psycho

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Re: May have over revved the engine- fuel issue?
« Reply #24 on: February 03, 2014 - 11:37:00 pm »
if the motor locked up after it was running you should be OK typically the starter will nothave enough power to bend the valves or con rods but if the nmotor is locked up the cylinder have more then 90 cc of fuel in them && it will not compress liquid so it will be badly flooded , especially if it pushed fuel into the brake booster !!

Challenger - You`ll wish You Hadn`t

Offline tommyg29

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Re: May have over revved the engine- fuel issue?
« Reply #25 on: February 04, 2014 - 05:32:53 pm »
oh yeah,
probably at least a gallon of gas came out the uncapped opening in front of the booster.
Now Im trying to figure out how to get a micro fuel line down into the booster to try and get fuel out. Its probably full and maybe ruined.
Will be draining my oil tonight also.
PS
Just drained it and the first couple quarts were oil so I figured, ok, cool. and then a torrent of the lighter than oil fuel started gushing out. Easily more than a gallon, so far. Stuck the plug back in for now before it overflowed my 3 gallon oil bucket.
Checked the brake booster and it seems dry so I should be lucky there.

And another update, there was probably 2 gallons of fuel in the case, and then I pulled the front carburetor and will take a close look at it.
Will put some cheap oil in it and a quart of an engine "flush" oil, put the new plugs in it and run it lightly a few minutes and drain again and put the good oil back in.
« Last Edit: February 04, 2014 - 09:11:31 pm by tommyg29 »
72 Roadrunner 400-4 Auto-3.23 Gear-Black Cruiser
71 Cuda 440-6 Tribute-Limelight-A833 Close Ratio-4 Sp-Pistol Grip-Dana 3.54 Powr Lok-Rally Dash-Shaker (Sold)
92 Dodge Stealth RT-Twin 15g Turbos-SAFC2 Tuned-Mystic Blue-5 Sp-AWD-Rear Wheel Steering-AutoX'r (Sold)
12 Dodge Charger SXT Plus Blacktop Package-3.6L-8 Sp-Leather-Nav (the wife's)

Multiple SRT's, Rams, Dakotas, Caravans and Neons

...the lines on the road just look like dots!....

Offline PlumCraZRT

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Re: May have over revved the engine- fuel issue?
« Reply #26 on: February 06, 2014 - 03:50:29 am »
Dang, seems like a good reason not to have an electric fuel pump??

Many people use the fuel pressure dummy (on/off) sensor connected to a relay to power the fuel pump.  You can't prime the fuel system, but the fuel will shutoff if the engine isn't running (or if you don't get oil pressure).
mmmmm.... Mopar.... *drool*

Offline tman

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Re: May have over revved the engine- fuel issue?
« Reply #27 on: February 06, 2014 - 05:05:11 am »
Is the fuel pressure regulated?  If its too high, it can create problems. 

Offline Chryco Psycho

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Re: May have over revved the engine- fuel issue?
« Reply #28 on: February 06, 2014 - 07:52:56 am »
Rock Auto lists the 6 pack carb kits for $18 each but they are made by Standard , the genuine Holley kits are about the same price & I would recommend the Holley kits over Standard

Challenger - You`ll wish You Hadn`t

Offline cudabob496

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Re: May have over revved the engine- fuel issue?
« Reply #29 on: February 06, 2014 - 11:42:53 am »
Many people use the fuel pressure dummy (on/off) sensor connected to a relay to power the fuel pump.  You can't prime the fuel system, but the fuel will shutoff if the engine isn't running (or if you don't get oil pressure).

Yes, best to employ "dummy" control mechanisms whenever possible!
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"