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Discussion Starter #1 (Edited)
I was out on the lake yesterday in some pretty chopped up water, I hit a wave and launched the boat, when the boat settled the engine died and I had to get towed in. I found out this morning the the dizzy gear had eaten up 4 teeth on the cast gear on my MSD. This engine has about 100 hours on it and have never had any problems with it. I took a mirrior and a flashlight down the opening to look at the cam gear and it appears to be ok, I spun the engine over and checked it 360 degrees. LUCKY I GUESS I had this happen to me a long time ago on another boat and it ate up the cam gear as well. The cam in the engine is a hyd. roller and it appears to have a a cast gear on it. I was always told to run a bronze gear on a billett cam and a cast gear on a cast cam.Im looking for some opinions on what gear I should by to replace the broken one with. I see there is a polimer gear now and is about $110. I dont care how much it cost but I dont want to break another gear. Im hoping to get the engine to last the rest of the season with the metal that is now gone threw it and do a tear down this winter to repair the damage the broken gear has caused to the oiling system.
 

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I would change the oil, go in the pan with a magnet to pick up any of the pieces, the cast gear should be magnetic, as to what gear to use I think GN7 or some of the other guys on the dyno forum would know more than me on that. Did it shut down as soon as you came back in the water or did it run for a bit?
 

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Change the cam gear but before firing the engine up, stick a large magnet on the oil pan right next to the drain plug so the broken teeth will secure themselves against that location without floating around. After timing the distributor with the new gear and warming the engine and oil a bit, pull the plug to drain the oil and after the oil stops draining, carefully remove the big magnet toward the drain plug then pick up the cast teeth with a small magnet through the drain hole. Some guys run a magnet on their oil pan at all times just to collect any possible metal fragments from the oil system.
 

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Also remember that the gear drives the oil pump. Something gets in the oil pump and that takes out the gear. Look at the old gear and see if it has been wearing (sharpening). If it has then it was gear wear (like this Poly did)...otherwise it could be something got in the oil pump.
 

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The cam in the engine is a hyd. roller and it appears to have a a cast gear on it.
I guess if you don't know for sure it may be safer to run the bronze gear.

Fiat has previously posted that photo and it makes me think the composite one is not something I would want to try.

I normally use 2 piece cams for my roller cam engines so that they can run cast gears, since they seem to usually be trouble free.
 

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If its a hyd roller it would help to know whos cam it is and what grind. Many hyd rollers are hardened cast blanks and cam can run a melonite iron gear.

If in any doubt, run a bronze gear. But remember you will have to replace it as it wears.

Stay the hell away from the poly-carbon gears unless your running a dry sump. And even in you were running a dry sump, the bronze gear would probably last forever, so why bother.

Like Fiat said, it drives your oil pump as well as turn you dizzy. Its you oil pump that puts the load on the gear. If you chunked an iron gear, I would be taking a hard look at the oil pump. I get a oil pump primer drive shaft and spin it for a good while to make sure the oil pump is ok first.

Lunati sells a steel gear called Everwear, for rollers, but I have never run one.



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Discussion Starter #8
unfortunatly the paper work i have with the boat has 2 cam cards one is a crane and one is an isky. so i dont know which one is in the engine.
 

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unfortunatly the paper work i have with the boat has 2 cam cards one is a crane and one is an isky. so i dont know which one is in the engine.
Unless they have the same lift at the valve... just check intake and exhaust lift at valve and see which one is pretty close.
Wags
 

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Discussion Starter #11
yep your right it says ig on the part number. i thought it looked like an iron gear. would it be ok to run the bronze gear i.d. is .500? i wouldnt care if i had to replace it once a year if necessary. im going to install my oil pump prime tool on it tomarrow and make sure it is not damaged and i also saw that you can make a notch in the distributors oil galley down to the gear and it will flow extra oil on the gear as well. any thoughts on that?
 

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yep your right it says ig on the part number. i thought it looked like an iron gear. would it be ok to run the bronze gear i.d. is .500? i wouldnt care if i had to replace it once a year if necessary. im going to install my oil pump prime tool on it tomarrow and make sure it is not damaged and i also saw that you can make a notch in the distributors oil galley down to the gear and it will flow extra oil on the gear as well. any thoughts on that?
Yes you can run a bronze gear on it. But you will have to replace it so keep an eye on it. Personally, unless you have a bronze gear in your hand, I would run a iron gear, but it is your choice.
If you aren't running a dizzy with o-rings above and below the oil galley transfer band on the housing, I wouldn't bother with the oil groove for the gear. You would be amazed at the oil that pours out around the dizzy housing. That gear is already getting plenty.

By any chance, is this a 460 Ford?


dizzy gears don't just break because you launched the boat off a wake.



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Discussion Starter #13
Yes you can run a bronze gear on it. But you will have to replace it so keep an eye on it. Personally, unless you have a bronze gear in your hand, I would run a iron gear, but it is your choice.
If you aren't running a dizzy with o-rings above and below the oil galley transfer band on the housing, I wouldn't bother with the oil groove for the gear. You would be amazed at the oil that pours out around the dizzy housing. That gear is already getting plenty.

By any chance, is this a 460 Ford?


dizzy gears don't just break because you launched the boat off a wake.
its a 468 bbc i know launching off the wake didnt cause it it was just a coincedence. i was thinking the bronze gear incase this happens again i got lucky this time that it didnt hurt the cam gear.
 
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