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Old 06-29-2008, 03:42 PM   #1 (permalink)
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oil leak, rocker boxes & gear cover

Howdy, new to the forum etc etc

Here is the situation
1. Ultima Fat Bastard kit bike from 2001
2. S&S 113" long block finished by Ultima (Harley Heads)
3. To busy working, been building the bike since 2001, has run a little approximately 50 miles until last week.

Put about 175 miles on it (have been gentle, for the most part, fluctuating between 1500 -2200 rpms) when I noticed blow by coming out between the middle and top layer of the rocker boxes, front and rear. Just the slightetst mist of oil, mostly air coming out.
Shortly after that a significant oil leak apperared from the hole in the gear cover where the electric leads exit. Had a shop attempt to repair that day on short notice, held for approx 40 miles then leaked again, not quit as bad.

I have no experience with big twins or motorcycle motors for that matter.

My thoughts
1. Bad seals (bike has been stored in New England winters)
2. Lower crankcase breather is plugged and not in use
3. Pressure valve relief check ball stuck
4. Fluid level seems high (3 quarts sits right at bottom of fill port in horse shoe tank)

Just looking for some feedback and suggestions or if this has been discussed before, point me in the right direction.

Thanks in advance for your help.
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Old 06-29-2008, 11:20 PM   #2 (permalink)
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Is the breather gear 'timed' correctly ??

That could cause excess pressure in the motor & result is leaks everywhere..

Just something to consider...
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Old 06-30-2008, 04:20 AM   #3 (permalink)
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I have never had the gear cover off, not to say they were put in correctly in the first place.

Also, I know there are some configuration differences between top breathing, bottom breathing or both. I believe there is a different gasket on the oil pump and not sure what else. S&S recommends both which this motor may have been set up for, I seem to remember removing the fitting on the bottom and plugging it since it had the head breathers.

Not sure if that would cause issues?

Are there any other items necessary to breath top and bottom and where does the bottom breather connect?

Thanks for the help
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Old 07-01-2008, 05:19 AM   #4 (permalink)
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If the crankcase vent is plugged or clogged, it will cause excess pressure in the top end and blow out gaskets too.
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Old 07-01-2008, 11:46 PM   #5 (permalink)
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odgrn-

HD head breathers are set up that way.

I'd contact S&S, I bet you have to unplug that plug you mentioned.. I think that is your problem..

S&S does use case breathers too.. plugging it would do all you've described.
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Old 07-05-2008, 06:24 AM   #6 (permalink)
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I opened the lower crankcase breather and replaced the cam seal that was bad and the issue seems to be fixed for now. I did not replace the rocker box gaskets yet however there is very minimal discharge from there so I will replace those at a later date.
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Old 07-08-2008, 12:40 AM   #7 (permalink)
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odgrn-

Sounds like it's back breathing like it should.. Relieving the crankcase pressure sure can make the gaskets work as intended..

That's good news !!!
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