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post #1 of 11 (permalink) Old 04-19-2017, 03:19 PM Thread Starter
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3 Quarts??

Did my first Oil and Filter change on my Road Glide Ultra today.
I noted that the Owners Manual said to put in 3 Quarts, and run it, then top it off.

Two things I wonder about:

A. 3 Quarts left me about a half Quart below the Hot mark
(on the Jiffy). I added another half Quart. Better to leave
it a half-Quart low? (Some might say "yes")

B. I noticed that, after changing the oil and filter, when I unthreaded the dipstick, I got a fart burst of air, from the oil fill location when I released the pressure of the dipstick threads. Normal? Why did it do that????

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post #2 of 11 (permalink) Old 04-19-2017, 05:07 PM
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Quote:
Originally Posted by soupy1957 View Post
A. 3 Quarts left me about a half Quart below the Hot mark
(on the Jiffy). I added another half Quart. Better to leave
it a half-Quart low?
(Some might say "yes")
No. You want to maintain the oil at the proper level.

If the owner's manual specifically says to run it, check it, and top it off and keep the proper level of oil in there, why in the fruck would you think it's better to have less oil in there?


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Originally Posted by soupy1957 View Post
B. I noticed that, after changing the oil and filter, when I unthreaded the dipstick, I got a fart burst of air, from the oil fill location when I released the pressure of the dipstick threads. Normal? Why did it do that????
That might only be normal if the engine was running, but you wouldn't be checking the oil with your engine running.
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post #3 of 11 (permalink) Old 04-20-2017, 06:12 AM Thread Starter
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I've heard it before............leaving it lower than "full" (in the cage world). I think the concern was "room for expansion" or something like that.

For the record, I did fill it to "full"

Nope, engine was off when I checked it and heard the air release. Pressurized oil system????

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post #4 of 11 (permalink) Old 04-20-2017, 07:58 AM
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I read on HD forums that some guys recommend leaving the oil level a little low to help prevent oil breathing into the air filter. It's a stupid way to mitigate a minor annoyance. Not that this is your problem. I'm just agreeing with Eye to top it off. I've found that the recommended oil amount per the manual is not exact. Based on some variables it might be a little less or more. At least I've found this with both my Ultra and Sportster. Trust the dip stick and put in what it needs.
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post #5 of 11 (permalink) Old 04-20-2017, 09:09 AM
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Over filling a dry sump system like the Harley big twins doesn't do a thing bad to the engine, it just results in a fuller oil tank. I've never had a drop of oil from the sump show up in a Harley's air cleaner like I have seen in JAP bikes that are not dry sump.

Truthfully, a little atomized sump oil being sucked into the combustion chamber may be a good thing acting like an upper cylinder lubricant. Valve guides love it.

I've known many builders and racers that use a few ounces of upper cylinder lubricant per tank of gas in their Harley's for high speed and long touring rides, never to any ill effect. Marvel mystery oil or a good 2 stroke oil was the most popular. Harley used to sell their own upper cyl lube in a squirt bottle and we used that on our long distance touring rides.

A little extra lubricant never hurt a thing.

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post #6 of 11 (permalink) Old 04-20-2017, 08:37 PM
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Quote:
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Truthfully, a little atomized sump oil being sucked into the combustion chamber may be a good thing acting like an upper cylinder lubricant. Valve guides love it.
Yeap, that's why the system is designed the way it is: So any oil that doesn't get separated when venting the crankcase pressure is used as an extra upper end lubricant.

And I've never seen a Harley engine get damaged by too much oil either. I have seen too much oil cause excessive drips and runs out of the air filter housing though, especially when that engine is run hard. It can also make a mess out of the filler spout, especially on Softails.
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post #7 of 11 (permalink) Old 04-20-2017, 08:43 PM
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Quote:
Originally Posted by soupy1957 View Post

Nope, engine was off when I checked it and heard the air release. Pressurized oil system????
You have a gerotor oil pump mounted directly to the end of the crankshaft, so the only time your system has pressure is when the engine is turning over.

I suppose it's possible that when you shut off the bike the scavenger gears stopped at an exact point that allowed a little pressure to stay in your oil bag, but I've never actually noticed that. Maybe what you heard was more like the normal very slight noise when you open the dipstick, and you just aren't used to hearing that and so it seemed louder? I dunno.
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post #8 of 11 (permalink) Old 04-20-2017, 08:48 PM
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Quote:
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It can also make a mess out of the filler spout, especially on Softails.
The first change I ever did on the Sporty. Man, what a frickin mess after my first ride after doing it. That's how I learned that the manual's stated oil capacity is not necessarily the amount you put in during a change.
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post #9 of 11 (permalink) Old 04-20-2017, 08:56 PM
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I think we've all done that at some point.
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post #10 of 11 (permalink) Old 04-20-2017, 11:11 PM
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--

On Yamaha RoadStars, if you don't fill 1/3 qt. less than the factory directions (with or without a filter), then you will blow out the extra into the air cleaner. Sure, we route our breather tube to where any blowby isn't oiling anything we don't want oiled, but still----the engineers were wrong.

Since we don't burn oil, ever, we still have the same amount after several (or even 9,000) miles.

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post #11 of 11 (permalink) Old 04-21-2017, 05:28 AM
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Must be a Yamaha thing, my Vstar 650 was the same way. Fill it barely to the bottom 1/4 of the sight glass and stop there, 5000 miles later the level was still there.
Fill to the top of the glass, 500 miles later it was on the bottom 1/4 and rest of the oil was in the air cleaner.

It knew what it needed... :-)

Quote:
Originally Posted by RonK View Post
--

On Yamaha RoadStars, if you don't fill 1/3 qt. less than the factory directions (with or without a filter), then you will blow out the extra into the air cleaner. Sure, we route our breather tube to where any blowby isn't oiling anything we don't want oiled, but still----the engineers were wrong.

Since we don't burn oil, ever, we still have the same amount after several (or even 9,000) miles.

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