Charlotte,
Start with the basics:
valve lash
valve timing: At tdc 360 degrees from firing the exhaust valve should be just
closed and the intake valve just opening. kind of resting in the valley
between the two lobes.
compression
ignition timing
make sure the choke is unstuck (push the nozzle up) the big backfire was from
flooding. Try carb cleaner spray on the choke/nozzle area.
Radiator: take off both hoses, duck tape the guarden hose to the bottom
(outlet)of the radiator and run water backwards through it. Flushes crap out
of the top tank. Also I have a reverse flushing tool that uses water and
compressed air that I could loan you if you have compressed air at your
house.
Block: Pull thermostat and reverse flush.
thermostat: is it actually opening and the radiator getting hot? Make sure it
is installed with the temp sensitve side down in the head.
enough of the high speed brain dump, off to work I go. Let us know how it
goes.
keith
>
> After checking the thermostat (checked ok) and the temperature of the water
> in the radiator (pretty much matches the gauge, which is an after-market
> mechanical one, I decided to try and reset the timing. That's when
> everything it seems just fell apart.
>
> The engine started running so rough that it was impossible to get a good
> reading on the timing. Having spent a good weekend not long ago balancing
> the carbs with some success, I was hesitant to suspect fuel mix. That
> didn't last for long because the engine sputtered and stopped. Filled the
> tank with gas (I try to address the obvious first) & took off the air
> filter
> from the carbs. Still nothing.. it would occasionally try to turn over but
> just not make it. I checked the dashpots on the carbs, which were full of
> gas and the floats were floating. I pulled the spark plugs and noted that
> #3 was wet & smelled strongly of gas. The carb that feeds #3 turned out to
> have the arm that is on the bottom (I think it controls the nozzle) stuck
> as
> far down as it would go, and it was spilling gasoline down the bottom of
> the
> carb. I pushed it back up, where it clicked into place & tried starting
> the
> car. I got the most spectacular backfire out of the carb that I think I've
> ever seen! I can't even be in the same room as someone blowing up balloons
> because I can't stand the sound of a popping balloon. This backfire just
> about sent me in orbit.
>
> I feel like I'm at square one again... we had similar problems with
> starting
> with the original engine that we replaced several months back. Any
> thoughts/ideas would be gratefully appreciated.
>
> Charlotte Hoover
> Phoenix, AZ
> '64 SPL310 1500
> '64 SPL310 1600
> '73 240Z
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