| [GMCnet] After new distributor - Spark and fuel but no run [message #351862] |
Mon, 03 February 2020 06:53  |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Senior Member |
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Hi,
I have replaced the distributor from point to HEI, and now it does not
start.
How can I verify that the alignment of the distributor and the cylinder
is okay now, as I assume that I made a mistake there.
Spark and fuel is there.
Any and all help is greatly appreciated.
--
Best regards
Olly Schmidt
PGP KeyID: 0x4196BF22
'76a 26' Eleganza II - Virginia, US
'73 23' Sequoia - Schleswig-Holstein, Germany
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] After new distributor - Spark and fuel but no run [message #351868 is a reply to message #351862] |
Mon, 03 February 2020 10:54  |
powwerjon
Messages: 849
Registered: March 2013
Karma: -2
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Senior Member |
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You need to mark the wire for #1 and mark the dizzy on the side with a
marker to indicate #1 and then remove the dizzy. First you need to get the
engine on TDC (top dead center) for cyclinder #1 (looking at engine thru
the engine cover is first (front) spark on your left side). The timing
mark on the crank should also be on or near the timing mark when close.
The damper could be a little off. The way that I use is to remove the
plugs (make it easier to turn the motor over). put a finger over the #1
plug position and bump the engine over. The engine cylinder will go thru
its 4 cycles (suck, compress, bang and blow) You are looking for the top to
the compress cycle. When I feel the piston coming up to compress the
mixture just before bang, that is TDC. I sometime put a screwdriver in the
hole to feel the piston position and then use a socket and breaker to move
the screwdriver to indicate the piston position. Never do this with the
starter when using the screwdriver. Now that you have the engine set at
TDC you can now go about reinstalling he dizzy. The rotor when the dizzy
is installed should be pointed and the#1 mark that you put on the side of
the dizzy. Please note that the gear on the bottom of the dizzy will lnot
drop in without moving the rotor. You will need to offset the rotor
typically to the right to have it line up with yur mark. This may take
several tries. Now your read to put everything back together. Besure you
are using the correct firing order.
First make sure the vacuum hose toot he dizzy is disconnected and plugged.
Timing light on the #1 spark plug and powered up. Take a white crayon and
mark the timing mark on the dampener to see the timing mark when running.
Double check that everything is in it proper place and now your ready to
try and start. It should start and maybe run smooth or roughly. It it
runs use the timing light to set the dizzy to the proper BTDC to about 10,
I now that the book says 8, but 10 or 12 is better. I usually move the
dizzy so the engine runs smoothly and take it for a test ride. If it pulls
with knocking thru the RPM range then check with timing liight and leave it
alone.
In the 6Y section of your manual has a get set of pictures for reference.
If you don't have the manual download it from Bdubs site. Page 6Y-34 shows
the timing marks. Weather having the points or HEI the procedure is the
same.
Regards,
J..R. Wright
GMC Great Laker
GMCGL Tech Editor
GMC Eastern States
GMCMHI
TZE Zone Restorations
78 Buskirk Custom 29.5' Stretch
75 Avion (Under going Frame up Restoration)
On Mon, Feb 3, 2020 at 5:54 AM Olly Schmidt via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Hi,
>
> I have replaced the distributor from point to HEI, and now it does not
> start.
>
> How can I verify that the alignment of the distributor and the cylinder
> is okay now, as I assume that I made a mistake there.
>
> Spark and fuel is there.
>
> Any and all help is greatly appreciated.
> --
> Best regards
>
> Olly Schmidt
> PGP KeyID: 0x4196BF22
> '76a 26' Eleganza II - Virginia, US
> '73 23' Sequoia - Schleswig-Holstein, Germany
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] After new distributor - Spark and fuel but no run [message #351897 is a reply to message #351869] |
Mon, 03 February 2020 22:42 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Olly,
Since you already installed the distributor:
Connect a timing light to #1 or #6 plug wire
Mark the timing line onj the dampener with something white or bright yellow. The line is a groove scribed across the dampener. I use white out.
Then crank the engine and see if the light flashes. If it does, point the light at the dampener and see if it is flashing near where it should on the timing line.
If you are not positive that you are getting spark, unplug the +12 volt lead at the distributor and attach a 3 foot jumper with alligator clips direct to the distributor +12 volt connector. Attach the other end of the jumper to anything +12 volts up front near where the isolator is mounted. You now have +12 volts all the time and can eliminate any electrical problems in the coach wiring switches etc.
This is only a test and the coach should not be run this way unless you want to get out of the coach and disconnect the wire every time that you need stop the engine.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] After new distributor - Spark and fuel but no run [message #351941 is a reply to message #351927] |
Wed, 05 February 2020 00:38 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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That is true but, I was just trying to get him to quickly find out if the distributor is really putting out a reliable spark and if it is anywhere near where is should be. It is a quick diagnostic thing to do with out removing anything or requiring any tools. More in depth diagnosis like you are proposing might be required later.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] After new distributor - Spark and fuel but no run [message #352579 is a reply to message #351862] |
Wed, 04 March 2020 20:55 |
tmsnyder
Messages: 151
Registered: January 2014
Karma: -9
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Senior Member |
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Is there any chance you installed the distributor TDC on the exhaust stroke instead of the compression stroke? The crankshaft rotates twice for every single rotation of the distributor, so you could have the distributor 180 deg off.
If you pull off the drivers side valve cover you can verify that the rockers are both up and not moving at TDC on #1
Todd Snyder, Buffalo NY
1976 Eleganza II
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