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Old 01-18-2013, 12:54 PM   #1 (permalink)
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Default V-8 fuel pump concentric

Well, another step back! The fuel pump wouldn't pump fuel. We took off the timing coer to find the pin gone out of the fuel pump concentric, the bolt loose, and the concentric spinning around. This is a 289 in my 67 Fastback. Is there a different type of concentric than one with a hole and pin to go into the timing gear? Is this common?
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Willy
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Old 01-18-2013, 02:25 PM   #2 (permalink)
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Did the pin shear off? Is it still in the end of the cam? If not put a new one in and bolt it down. A concentric is not going to pump much...an eccentric will though ....
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Old 01-18-2013, 04:39 PM   #3 (permalink)
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I can't say that I've ever seen this happen before, but if the bolt was loose, then hopefully the pin came out peacefully and didn't shear off. Also, make sure you use at least some medium strength loc-tite on that bolt when you torque it back in. Otherwise it may work itself loose again.

Couple of additional thoughts:

If re-using, check the eccentric to see if it's damaged, oval shaped, or if the bolt hole is wallowed out (replace with a new one is preferred).

Also, while you have the timing cover off, fish around in your oil pan with an extendable magnet and try to locate and scoop up the old pin.
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Old 01-20-2013, 01:07 PM   #4 (permalink)
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Default Concentric fixed

The pin that keeps the concentric in place was to short. After removing the timing gear, the pin came out of the camshaft, no problem. I got a longer pin from Tacoma Screw, a local tool house, forced it into the cam with a brass drift very gently, now I'm putting it back together. I will get back to everyone with the results. Thanks afor the followup comments!
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Old 01-20-2013, 01:24 PM   #5 (permalink)
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It is eccentric not concentric.

Yeah, I'm new to this as well.
Does the eccentric pin go through the eccentric, timing gear, and cam shaft??

I have a '95 5. HO that I will be putting a 1 pc eccentric on and I have no clue if there is a hole in the cam shaft for it since that motor has an electric fuel pump.
Lynn
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Old 01-20-2013, 01:30 PM   #6 (permalink)
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Quote:
Originally Posted by LynnBob 65 Mustang View Post
Does the eccentric pin go through the eccentric, timing gear, and cam shaft??

I have a '95 5. HO that I will be putting a 1 pc eccentric on and I have no clue if there is a hole in the cam shaft for it since that motor has an electric fuel pump.
Lynn
You got it.

I put a Ford Racing 5.0 HO short block in my '66 coupe. The cam in it had the hole for the eccentric. So I suspect you will be okay there.

Good luck,
MrFreeze
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Old 01-21-2013, 04:13 PM   #7 (permalink)
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LYN BOB: Yes, the cam and the concnetric both have holes for the pin to go through. You have to make sure the pin is long enough and tight enough to STAY in place. My problem was the pin was to short to go through both . Hope that helps.
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Old 01-21-2013, 05:15 PM   #8 (permalink)
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Gypsy, I'm going to beat you to it.....I'm having a "pet peeve" day...

DICTIONARY: concentric
Definition
con·cen·tric[ kən séntrik ] To hear the pronunciation, install Silverlight
ADJECTIVE
1. with common middle point: describes circles and spheres of different sizes with the same middle point
2. with common axis: with a common axis or center line
[ 14th century. < medieval Latin concentricus "having the same center" < Latin centrum "center" ]

DICTIONARY: eccentric
Definition
ec·cen·tric[ ik séntrik ] To hear the pronunciation, install Silverlight
ADJECTIVE
1. unconventional: unconventional, especially in a whimsical way
"an eccentric mode of dress"
2. technology away from center: away from the center or axis
3. mathematics having different centers: describes circles with different centers
4. astronomy elliptical: describes an orbit that is elliptical rather than circular

NOUN
1. unconventional person: an unconventional person who has unusual habits
2. mechanical engineering mechanical device: a mechanical device with an off-center axis of revolution that converts the rotary motion of one component of a mechanism to reciprocating motion in another
[ Mid-16th century. < late Latin eccentricus < Greek ekkentros "out of center" < kentron (see center) ]


Note that only one of these words can be used as a noun as well.
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