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Old 01-02-2005, 02:57   #1 (permalink)
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distributer gear pin and wear

driving along and then engine died , pull over , didnt start , no spark , rotor not turning ,
pulled dissy out and roll pin holding gear on was sheared and the steel gear teeth have worn nearly half way through

i had engine apart a few days ago for a cam change and didnt notice the wear

the dissy shaft is a nice fit in the block - i thought maybe its flogged out or the wrong dissy / shaft but its ok

any ideas

high volume pump has been in for about a year

i put in another dissy , went in with a bit of a jiggle ( like it supposed to )and ill check that in a few days

is the centerline of the dissy supposed to line up with the center of the cam gear - mine doesnt( i cant imagine the cam is made wrong though)
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Old 01-02-2005, 03:00   #2 (permalink)
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Re: distributer gear pin and wear

I've seen that happen when debris locked up the oil pump.

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Old 01-02-2005, 03:15   #3 (permalink)
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Re: distributer gear pin and wear

that is possible , im doin a oil change in a day or so , so ill check the oil out ( i do everytime anyway)

what do you think of turning donk over backwards to dislodge it - im graspin shi# out of thin air here to save me from takin sump off

ill check that gear and oil for crap in a day or so anyway
not much on the car is goin my way to get to the nats on time
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Old 01-02-2005, 03:19   #4 (permalink)
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Re: distributer gear pin and wear

In the case that I saw. It couldn't be freed without removing the pump form the engine and pulling the pump physically apart. In the end it had scored the oil pump and made it too risky to use again. What we found in the sump was a very very small piece of an umbrella seal (stock valve stemseal).

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Old 01-02-2005, 03:41   #5 (permalink)
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Re: distributer gear pin and wear

Well you changed the cam and it happened, so I would suggest it is a compatability of cam gear material and the camshaft. When they are incompatable they can flog out extremely quickly. Do a search on the www and you will find many discussions on the topic.

I don't know the specific recommendations, but a billet steel cam will eat a standard dizzy gear.
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Old 01-02-2005, 03:46   #6 (permalink)
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Re: distributer gear pin and wear

if gear wear and oilo pressure is ok ill have to risk it till after the nats
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Old 01-02-2005, 03:48   #7 (permalink)
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Re: distributer gear pin and wear

sometimes they do just shear off , Try putting the dissy back in without the gear on it and rotate the rotor by hand and you will see if the pump has jammed. The worn gear could have caused debri's. you can replace with bronze gears. Not sure why it has worn so quickly, might be worth looking up on msd site to see if replacing the gear with a bronze will fix your problem. I replaced my roll pin with a snap on roll pin. No trouble since. Hope this helps.
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Old 01-02-2005, 03:48   #8 (permalink)
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Re: distributer gear pin and wear

its the same brand of cam that i changed but it s [possible
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Old 01-02-2005, 03:50   #9 (permalink)
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Re: distributer gear pin and wear

good idea to check the pump blueprinted
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Old 01-02-2005, 05:53   #10 (permalink)
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Re: distributer gear pin and wear

Hi volume pumps put the roll pin under a lot more pressure thasn a standard pump and some dissy,s especially mallorys used to shit themselves on a regular basis.The solution if indeed the pump has not jammed is to use two roll pins,one inside the other or to redrill the gear and shaft and install a larger diameter roll pin.
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