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Author Topic:   dist and cam gears
garyl
Member
posted July 06, 2003 05:14 PM
12 nights on msd dist and comp cam, ate the dist. and cam gear for no apparent reason. every thing was done buy the book when installed and rechecked .the mesh marks on the remaining teeth apear to be right on, have seen a few of these from other racers also is there a problem with the quality of the dist. gears mabey? what can one do any better to illiminate this problem? will abronze dist. gear help? tis is not aroller cam. I need some pro answers ! thanks


tilley88
Member
posted July 06, 2003 05:52 PM
If you've got oil restrictors in the back of the block, now would be a good time to check 'em for metal shavings off them gears.


dirtracer14
Member
posted July 06, 2003 05:53 PM
I am by far not a pro but i have the same problem from time to time i believe its from cam walk and or oil pump drag....just herd about the oil pump thing. I use a bronze now with or without the cam button just because it will not hurt the cam gear and only eat the bronze up.


allriggs
Member
posted July 06, 2003 10:43 PM
i dont know what brand of motor u guys are running, but on ford u dont put cast gears with steel it with eat it up.


towmandan
Member
posted July 06, 2003 11:26 PM
Tilley made a very good point although you may not want to I would take the engine down and give evrything a good cleaning and if your running restrictors check them and also I would turn the oil pump by hand to feel any binding and take it apart and look at it if you have any questions replace it they are cheap compaired to the trouble your having....Towman


machine for speed
Member
posted July 07, 2003 12:31 AM
I am rebuilding a roller 406 right now for the same reason. Motor had maybe 60 laps on performance dist. cast gear, car was idling at the time of failure, it tore up all of the bearings. You need to run a bronze gear.The cast gear is not as forgiving.


06Racing
Member
posted July 07, 2003 10:08 PM
I have been chasing the same thing all this year! Motor eat`s dis. gear and ruins cam used bronze gear and wearing them out. oil pump always is fine all else is right on! Engine builder says all he can think of is cam walk and even with a cam button the stock front cover is flexing causing the failure.. MAKE SURE you take that engine down and clean everything ! I have went to a water pump with a adjustable cam boss to stop the flexing ! ???? will see if this stops it !


sdhnc29
Member
posted July 07, 2003 11:03 PM
You need to run a steel gear on a flat tappet cam , and a bronze gear on a roller cam .

The most common problem with the gears wearing out or being destroyed is the cam walking forward or improper engagement . I have also seen problems with MSD's when people leave both o-ring's on the shaft , not allowing enough oil to the gears .

As everyone else stated , be sure to take this engine apart and clean everything . All that metal is floating around somewhere .

Also a quick note about roller cam's . Be sure to run a bronze tip fuel pump push rod . The steel tip fuel pump rod will eat up the fuel pump lobe in time .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


rocket36
Member
posted July 08, 2003 06:15 AM
steve,
you said something about not running both o-rings on a msd distributor.
we run a MSD pro billet, which has the grooves for the 2 o-rings but the instructions say don't fit the o-rings unless your block has been machined for them, i assume this is chamfering of the leading and trailing edges of the distributor holes, which we didn't do to our block.
is it possible to run just the upper o-ring? as we have an annoying oil leak from under the adjustable collar, or will this just chew the bronze gear (onto roller cam).
note: we run oil restrictors (can't remember exactly what size, but they were the large ones for least restriction) possibly 0.080" hole size.


sdhnc29
Member
posted July 08, 2003 08:49 AM
Yes you can run just the top o-ring without fear of messing up your dist gear . This will keep oil from coming up into the lifter valley , and force any leakage down toward the dist gear , and might it might help with your leak .

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


rocket36
Member
posted July 08, 2003 09:26 AM
thanks, will try it.


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