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Backyard Mechanic Quick Reference Chart
Mechanic's Quick Reference
"FOOL PRESSURE CHART"
(For those who refuse to use a pressure gauge)
Due to the fact that most technicians do not want to take the time to
correctly test the fuel pressure, we have developed the following...
With the engine running, loosen the fuel line THEN IF:
=Fuel does not come out of the test area... Pressure is approx 0 psi
=Fuel hits the hood insulation... Pressure is 5 - 8 psi
=Fuel squirts over the fender... Pressure is 10-15 psi
=Fuel splashes off the fender onto the hood insulation
and into the next repair bay... Pressure is 25-30 psi
=Fuel squirts to the garage roof, all over the car,
including the shop owner... Pressure is 30-50 psi
"Rule of Thumb"
Put thumb on vacuum hose leading to direct engine vacuum.
Don't feel anything Change thumbs and re-test
Still don't feel anything Vacuum is very low to none.
Hose has slight suction 1" to 5"
Suction causes skin to wrinkle 5" to 8"
Suction turns thumb blue 8" to 10"
Suction creates hickey on thumb 10" to 12"
Suction creates pain 18" to 20"
Suction will not release and begins to move toward
index finger 20" to 25"
With the vehicle prepped and ready to be tested, hook the negative
the test light to a good ground and proceed with testing.
The bulb DOES NOT light The voltage is 0 - 1 volt
The bulb MIGHT be glowing The voltage is 1 - 3 volts
The bulb BARELY GLOWS (or there is a
reflection from the overhead lights) The voltage is 3 - 5 volts
The bulb GLOWS MUCH BRIGHTER than #2, but only
a little brighter than #3 The voltage is 5 - 7 volts
The bulb GLOWS WITH THE SAME INTENSITY AS A
BALD HEAD ON A SUNNY DAY The voltage is 7 - 9 volts
The bulb GLOWS BRIGHTLY and is GAINING IN
INTENSITY The voltage is 9 - 11
The bulb is ALMOST BRIGHT ENOUGH TO
READ BY The voltage is 11 - 13
The bulb is BRIGHT ENOUGH that you still see a spot
when you look away The voltage is 13 - 15
The bulb SHINES WITH THE INTENSITY OF A
HALOGEN HEADLAMP The voltage is 15 - 17 volts
The bulb is so bright that it MAY BE A SIGN
FROM GOD The voltage is 17 - 19
The bulb flashed with the INTENSITY OF A MINOLTA
FLASH POINTED 3 FEET FROM YOUR FACE
The voltage is 20 to 40,000 volts
IGNITION VOLTAGE OUTPUT TEST
Scopes may be inaccessible from time to time, so we at "Bubba's
have come up with this here test for Ignition Output:
1.Hold medium wrench in one hand, Sears wrench preferred for accuracy
of test 'cause other smooth wrenches are too slick for throwin'!
2.With engine runnin', grab hold of the plug end of an ignition cable
with the other hand and hold on tight!
3.This will more than likely cause you to throw wrench! KV output
is based on how far the wrench wuz thrown!
10 feet = approx. 10,000 volts
20 feet = approx. 15,000 volts
30 feet = approx. 25,000 volts
Over 30 feet = Caution! Must be one of them new
dis-is-it ignition systems,
use bigger wrench and retest.
WARNING! No side effects have been reported due to testing at this
time. Bubba Sez: Electricity will not usually hurt you, instead it is the
back of your neck going through the hood latch that really ruins your day!!
HOW TO TORQUE WITH AN IMPACT WRENCH.
Yes you can use your impact gun to torque nuts and bolts if you use this
handy chart along with your ears and a quick trigger finger.
TORQUE VALUE INGERSOLL IMPACT SNAP-ON IMPACT
25 to 35 ft/lbs BAP! BAP!
35 to 45 ft/lbs BAP! BAP! BAP! BAP!
45 to 60 ft/lbs BAP! BAP! BA... BAP! BAP! BAP!
75 to 90 ft/lbs BAP! BAP! BAP! BAP! BAP! BAP! BAP! BAP!
90 to 100 ft/lbs BAP! BAP! BAP! BAP! BAP! BAP! BAP! BAP! BAP!BAP!
110 to 300 ft/lbs BAP! BAP! BAP! BAP! BAP! BAP! BAP! BAP! BAP!
BAP! BAP! BAP! BAP! BAP! (all guns)
Attribution: Triumph Mailing List
Disclaimer: Use reference at your own risk. Figures may differ for
Lake Mills, WI
66 Corsa, 67 Dart GT, 71 TR6, 85 UrQ