Rochester Quadrajet Marine Carburetor Rebuild - Part 3 of 3
http://www.carburetor-parts.com is happy to provide the informational video
about rebuilding the Quadrajet marine carburetor. Buy carburetor parts for
this carburetor at:
How to measure and adjust Quadrajet float level
I have had several requests for this, so here you go:
1. The airhorn has to be removed to do this, but the carburetor does not
have to be removed from the engine.
2. Some data says to measure from the toe(end that is opposite from the
hinge), some say 5/16 inward from the end, etc. I suggest following the
specs for your particular carburetor.
3. With the float in the raised position and the inlet needle lightly
seated, measure from the top of the float to the top edge of the carburetor
with NO gasket in place. If you have to adjust the float, bend at the area
that has the cutouts,
4, If you are experiencing flooding issues then it is an excellent time to
install a new needle/seat and float and that should cure flooding problems
that are not choke-related.
Carburetor Rebuild Basics (Part 1) -EricTheCarGuy
Carburetor Rebuild Basics covers the basics of rebuilding a carburetor. Now
there are a LOT of different carburetors out there so this video won't
apply to all of them, but it will give you a general idea of what you would
be in for if you decided to rebuild one. Me, I like rebuilding carburetors.
There's something about mechanical things like carburetors that interest
me. How even the smallest part has a big effect on the overall operation of
your engine. Since we've gone to fuel injection carburetors have become
somewhat obsolete. I'm still a fan though. I may be a little rusty on this
stuff since I haven't done this in some time but I hope this video helps
you just the same. If nothing else, I hope you're entertained by it.
Camera: Brian Kast
The best place for answers to your automotive questions:
Carburetor Rebuild Basics (Part 2): To be added August 1, 2014
If you want to see the full version of this video with additional footage
now, become a Premium Member of EricTheCarGuy.com:
The Basics of Carburetor Adjustment: To be added August 8, 2014
Cleaning Throttle Bodies: https://www.youtube.com/watch?v=41yFXjibtLY
Solving Performance Problems 1: http://www.youtube.com/watch?v=rsGTeWayqIU
Solving Performance Problems 2: http://www.youtube.com/watch?v=sAKwCzUE_9M
Re Performance Problems: http://www.youtube.com/watch?v=_vAJi5rLMGY
Getting Better MPG:
Discussion about this Video: https://www.youtube.com/watch?v=85nszLpbbXY
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How to de-bog your Quadrajet part 1
Sorry guys, I got the videos a bit out of order.
The Rochester Quadrajet has gotten a bad rap over the years, often called a
Quadrabog or Quadrajunk.
In fact, this is a great multipurpose carbureter once you understand how
they work and what not to do to them.
In this clip I introduce you to the Quadrajet and begin explaining the
theory of operation of these units.
'77 Chevy K20: Quadrajet Choke Pull Off and Fast Idle Cam Observations
1977 Chevy K20. 350 crate engine. Rochester Quadrajet 4MV carburetor with
Truck suffers from unexplained hesitation and bogging when in forward
gears. Tends to rev just fine after a few minutes of mixed idling and high
revving. Checking choke operations as well as a possible sticky fast idle
cam as part of the process of elimination.
- Truck is allowed to idle/warm up until 2:25 mark, at which point the
engine is revved to about 2,000 rpm, and can be heard bogging (a hissing
sound can be heard). The fast idle cam is seen dropping. Fuel flow can be
seen in the glass-cased fuel filter right before the carb as remaining
- The engine is revved again about three more time up until 3:00 minute
mark. The engine revs slightly higher, but the hissing and bogging can
still be heard.
- Engine is revved again at the 3:35 mark, slightly past the 3,000 rpm
mark. Hesitation and hissing still evident, but less so than before.
- Engine revved at the 4:25 mark to about 4,000 rpm. No hesitation or
- Transmission is slowly shift through every gear starting at 4:55 mark.
Shifted back into Park at 5:05 mark.
- Engine revved again at 5:10 and 5:17 marks to 4,000 rpm. No hesitation or
hissing is heard.
To read up on the discussion, please visit the following thread:
1970 Ford Torino King Cobra Boss 429 Start Up, Exhaust, and In Depth Review
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