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02-14-2016, 11:54 PM | #1 |
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Isky cam failing
Hey guys, so I took my merc engine apart because it was using water, and as I was cleaning the parts I found that the idler drive gear on the back of the cam, the teeth are wore half off,
Any ideas on how this could happen, I'm thinking it wasn't properly heat treated. I don't remember which cam I put in it, the max1 or the JR, and I cant see any ID marks on it, any ideas here ? Thanks guys, |
02-15-2016, 12:57 AM | #2 |
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Re: Isky cam failing
Too much oil pressure? How much are you running?
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02-15-2016, 03:05 AM | #3 |
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Re: Isky cam failing
How does the idler and oilpump gear look ?
That will be a hint if one gear is soft or if its to much load on the gears or something else. |
02-15-2016, 07:07 AM | #4 | |
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Re: Isky cam failing
Quote:
Oil creates a film that prevents metal to metal surfaces from actually touching each other. Water does not create a film that prevents metal to metal contact. ...If the water in your engine, which you yourself said was "a lot", Displaced or replaced the oily film that prevents metal to metal contact, then your engine internals would have been prone to grind themselves to dust. If the lack of oil/film caused that damage to your cam/gear, how much additional damage might it have done to bearings, crank, cylinder walls, pins, timing gears, oil pump etc? ??? . |
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02-15-2016, 07:21 AM | #5 |
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Re: Isky cam failing
Lack of heat treatment on cam is usually seen at the cam lobes. This would be especially true of an overhead valve engine where valve spring pressure is considerably higher than that of our old Flatheads. But still, most times it is the lobes that self destruct, Just ask any of the 10,000,000 sbc owners of the last 50 years..... . |
02-15-2016, 09:02 AM | #6 |
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Re: Isky cam failing
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02-15-2016, 10:09 AM | #7 |
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Re: Isky cam failing
The really worn one appears to be the front distributor drive gear? Am I right on that? Are both gears (distributor and oil-pump drive) really worn? I must admit - I've never seen that.
If you had a lot of water in the oil, this could do it . . . but I'd also be checking my bearings! |
02-15-2016, 10:37 AM | #8 |
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Re: Isky cam failing
Looks like the distributor gear is ok and the oilpump/idler gear is the one that took a bad beating.
Thats why i was wondering how the pump/idler gear looked ? If the rest shows no excessive wear... |
02-15-2016, 12:15 PM | #9 |
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Re: Isky cam failing
You know that the gear is pressed on to the cam and can be replaced? Might have been a soft gear. Check it with a file.
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02-15-2016, 05:49 PM | #10 |
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Re: Isky cam failing
Thank you all so much for the help.
As soon as I noticed the water I stopped driving it, I did a cheep house brand oil change, twice, to try to get the water out of the oil so as not to rust anything while it waited for me to get it apart. Crazy enofe, the brgs and crank are not hurt at all, I'm goanna reuse everything, even the cam its self isn't hurt. The idler and oil pump gears are in top notch condition. I'm using a Melling high volume pump, haven't taken the pump apart yet but I will. Puzzles me about the gear. |
02-15-2016, 05:55 PM | #11 |
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Re: Isky cam failing
Probably a low quality gear then, perhaps even a warranty issue to discuss with Isky.
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02-15-2016, 05:56 PM | #12 |
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Re: Isky cam failing
Lotsa people opt for the Mellings high volume oil pumps.
Make sure that you absolutely lube up your front/rear crank seals with nothing less than engine oil or you may find that the extra pressure/volume and unsoaked crank seals will quickly lead to leaky rear seal. Avoid using grease especially that thin lithium/lubricate on your crank seals or you will be sorry. jmho |
02-15-2016, 06:04 PM | #13 |
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Re: Isky cam failing
Jeu Moefuzz, I soak them in oil for a couple days before assembly
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02-16-2016, 01:44 PM | #14 |
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Re: Isky cam failing
Replace with real live Henry part. Me thinks that you have an offshore piece of crap. Also fairly often looks at the oil will spot contamination. I change oil every 500 miles or so...
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02-16-2016, 01:54 PM | #15 | |
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Re: Isky cam failing
Quote:
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02-17-2016, 12:25 AM | #16 |
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Re: Isky cam failing
Thanks Walt,
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