519 update

General topics not pertaining to one particular type of engine, or topics regarding non-Cadillac engines.

519 update

Postby Natonia1969 » Thu Mar 09, 2017 11:44 am

OK gents, thanks for all the help by the way. I got the timing right finally after re stabbing the distributor a few times and located a vacuum leak. Anyway, it fires up, runs and will hold idle finally :metal: I do have another issue though. #7 isn't igniting or something..I checked the exhaust port Temps and all read around 480 degrees (at the time I checked) and #7 only reads 250... so I swapped out a plug from an old head and it did it again with the temp not going up like the other cylinders. I know it's firing bc when I put the timing light clamp on 7 wire it flickers. What do you think guys? Firing order is correct, plug wires are alao connected good. I will say that I'm thrilled the damn thing is at least back to life. :devil:
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Re: 519 update

Postby Ted in Olympia » Thu Mar 09, 2017 11:49 am

What is the compression in this hole? This is the most likely one to blow an head gasket. Could also be a bent push-rod or stuck valve?
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Re: 519 update

Postby Natonia1969 » Thu Mar 09, 2017 12:25 pm

New pushrods, lifters. I hope it's not that or a bent valve. That's also the same cylinder that bent them in the first place. Haven't done a compression test yet
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Re: 519 update

Postby caddycarlo » Thu Mar 09, 2017 2:35 pm

I agree with Ted ..time to compression check that hole
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Re: 519 update

Postby Natonia1969 » Thu Mar 09, 2017 4:17 pm

I just now pulled the spark plug wire and put a spark plug in it externally to see if it was sparking at all. Thankfully it had no spark at the plug so it has to be somewhere in the wire or cap :crossfingers:
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Re: 519 update

Postby pila78 » Thu Mar 09, 2017 6:53 pm

You can take a close look in the distributor cap for a carbon track around #7 wire stud inside of the cap...
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Re: 519 update

Postby Natonia1969 » Thu Mar 09, 2017 9:48 pm

No carbon on that cylinder either
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Re: 519 update

Postby Natonia1969 » Thu Mar 09, 2017 9:49 pm

But lights the timing light up when I clamp it on????
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Re: 519 update

Postby The Mad Cadder » Fri Mar 10, 2017 6:59 am

Natonia1969 wrote:But lights the timing light up when I clamp it on????


Means zippo.. they trigger off of static..

Check the wires resistance with a OHM meter
For stockish junk should be 3000 to 10000 ohm per foot
Depending on quality of wires. Or condition

Really good wires such as 8.8 mm sprial wound are as
low as 500 ohms per foot
The past

71 Fleetwood , 73 SDV , 77 Eldo , 81 Cdv 472 236 @.050
71 Skylark 504 232 @.05 - 512 250 @.050
80 Cdv 507 238 @.05 solid , 68 Coupe 500 224 @.05
69 Camaro 514 ,6-71 288 @ .05 - 524 14.0 274 @.05 soild roller
330 cfm iron heads best 1/4 mile 9.65 136.96 mph 1.31 60'

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Re: 519 update

Postby Natonia1969 » Sun Mar 12, 2017 7:52 am

My wire was about 3ft long with a resistance of 1300 ohms. Anyway it was the cap or button. I'm back to firing on all 8 cylinders. I haven't drove it yet bc my alternator is going out for rebuild, ordering all new hoses and belts.
It feels pretty stout when reving it
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Re: 519 update

Postby blue68deville » Tue Mar 14, 2017 3:24 pm

Good to hear it's up and running again, and all right this go around.

An old guy I worked with years ago showed me a cool and useful trick:
If you want to find an ignition miss with a timing light, don't look at the flash, just put it up to your ear and listen to it. It's easy to hear it fire evenly or not. I call it the cheap ass scope.
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Re: 519 update

Postby Natonia1969 » Thu Mar 16, 2017 12:17 am

Hey thanks, I'll keep that trick on file. This Saturday will be my first time driving it in a while and likely the first time on all 8 cylinders firing. Learning as I go here
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Re: 519 update

Postby The Mad Cadder » Thu Mar 16, 2017 3:12 am

Natonia1969 wrote:Hey thanks, I'll keep that trick on file. This Saturday will be my first time driving it in a while and likely the first time on all 8 cylinders firing. Learning as I go here


We have all been there
The past

71 Fleetwood , 73 SDV , 77 Eldo , 81 Cdv 472 236 @.050
71 Skylark 504 232 @.05 - 512 250 @.050
80 Cdv 507 238 @.05 solid , 68 Coupe 500 224 @.05
69 Camaro 514 ,6-71 288 @ .05 - 524 14.0 274 @.05 soild roller
330 cfm iron heads best 1/4 mile 9.65 136.96 mph 1.31 60'

"The Mad Banana" tow Caddy and
Someday .. One insane 27 T

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Re: 519 update

Postby Natonia1969 » Sun Mar 19, 2017 6:52 pm

Drove the Cadillac today, runs good cruising but I have the same problem as before my bent push rod catastrophe. It will rev up in park or neutral and act like its ready to tear the house down. but in drive it will only reach 2500 to 3000. Previously I had home ported heads with big valves that were gasket matched, now I have stock small chamber heads with big valves that i was going to port but honestly i didn't have time to do it. Now i have the Same issue. Just some info so maybe one of you guys have had this go on can fill me in . Mts 20 cam, edelbrock intake, pro form 950 carb, Robb mc fuel pump, headers, my fuel gage is between 5 and 6 psi when I can see it under the hood in park. Maybe my fuel filter? Not sure. Any thoughts would be greatly appreciated thanks again. Nate
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Re: 519 update

Postby nosgood » Mon Mar 20, 2017 9:02 am

What happens when it reaches 2500 - 3000 rpm? Does it just shift, even at wide open throttle? Or does it start to stumble?
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Re: 519 update

Postby Natonia1969 » Mon Mar 20, 2017 9:34 am

It kind of just picks up speed gradually. It will drive on the highway but from 0 to 60mpr it stays 3000 rpm and under matted to the floor
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Re: 519 update

Postby caddycarlo » Mon Mar 20, 2017 12:45 pm

What is the history on the transmission and converter?

Another thought is timing curve or spark problem?
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Re: 519 update

Postby Natonia1969 » Mon Mar 20, 2017 2:59 pm

Stock trans with pos stall converted I think it's an 1800 stall wich is not big enough. Converter was installed when the engine was originally so I was thinking about that being the problem also
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Re: 519 update

Postby caddycarlo » Mon Mar 20, 2017 3:56 pm

When was the transmission serviced last ... looking for a lot of friction material ? Just throwing ideas out .... like maybe hanging second gear clutchs ... could always drop the pan a look ...
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Re: 519 update

Postby Natonia1969 » Mon Mar 20, 2017 8:38 pm

The trans doesn't slip at all hence it not going over 3000 rpm. It shifts ok it seems. I'm going to swap the converter and see what that does. In the next couple of weeks
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