What if I didn't pre-fill the new oil filter? - Page 5 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #41 of 60 (permalink) Old 05-11-2018, 11:25 AM
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On the first oil change on my new-to-me 2006 Sprint ST I failed to fill the oil filter and let it drain for a long time. Replacing the filter and filling with the specified amount oil, on starting the oil pressure light would not go out. Tried it three times, removed the dip stick, tried a "burp", but still had an oil light. Finally dropped the oil filter that appeared about half full. Filled it with oil, reinstalled, started, and almost immediately the oil pressure light went out.

So either it took a long time for oil to fill the system from the pump or pre-filling the filter makes a difference.

The manual calls for pre-filling.
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post #42 of 60 (permalink) Old 05-11-2018, 11:40 AM
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"So here's another thing that's come up -- literally. After my oil and filter change, I idled the bike for 30 seconds or so. Waited a while and checked my level. Added another half-litre (half-quart, approx) or so to get it up between the markings on the case. That made it four litres, in all.

I get back from a one-hour ride, put the bike back up on its centre stand -- and now I'm significantly over the proper level. Well above the lines, but still within the sight glass.

How the heck does that happen? And is it significant enough to try to siphon out some of the excess?"



That's happened to me too.
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post #43 of 60 (permalink) Old 05-11-2018, 11:54 AM
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Total capacity with a complete drain and filter change is 4 US Qts. Excess "may" end up in your air box.

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post #44 of 60 (permalink) Old 05-11-2018, 04:13 PM
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There are a whole lot of bikes that have horizontal oil filters. (Hondas for example) There is no way to "pre-fill" those filters without having the oil run out out the ground before you can get it screwed on. I'm not aware of any big issue with Honda engines failing due to oil filters not being pre-filled. I have 2 Hondas with horizontal oil filters and both engines are just fine.

As an aside, I worked for a large car company before I retired. At one point, I was having an issue with very slow oil pickup after parking my vehicle after parking overnight on a downhill incline. I asked the manager of engine development about this an whether I was ruining the engine by letting it idle for 15 or 20 seconds before the oil pressure came up. He told me that any decent engine (mine included) could run for 10 or 15 minutes at idle with no oil pressure. Not to worry!! But remember, this is at idle!!
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post #45 of 60 (permalink) Old 05-11-2018, 04:17 PM
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Now the question is: do professional mechanics fill the filter before spinning it back on when you bring your bike/car in for an oil change? I'm pretty certain they don't. I'll be lucky if they rub a little used oil on the filter's o-ring before spinning in on.

Riding it like I financed it.
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post #46 of 60 (permalink) Old 05-11-2018, 05:21 PM
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^ So you just said that "professional mechanics" likely may not even put oil on the o-ring. So them not pre-filling a filter would be expected.

I had a "professional mechanic" forget to put oil in my bike when I took it in for its first oil change.

I think the bottom line here is if you can pre-fill your filter (without making a mess) it likely makes some sense. Will it really make any difference if you don't? Perhaps not, but if the manual says to, I'm gonna do it.
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post #47 of 60 (permalink) Old 05-11-2018, 08:47 PM
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Originally Posted by cadd View Post
Now the question is: do professional mechanics fill the filter before spinning it back on when you bring your bike/car in for an oil change? I'm pretty certain they don't. I'll be lucky if they rub a little used oil on the filter's o-ring before spinning in on.
most don't because they have a tight schedule with lots of jobs lined up ahead and can't be fagged poonsing around pre-filling an oil filter. they tend to drain the oil, remove the filter, refit the sump plug, refit a new filter then re-fill the sump with oil. all done fairly quickly within ten minutes, so there would be residual oil coating all the internals parts anyway

does it make a difference? probably not in the short term, maybe after a couple of hundred thousand kilometers there maybe a measurable difference

as I do all my own maintenance I tend to drain and remove the filter then poonse around scratching my backside etc, have a cuppa, then a few hours later finish off with a pre-filled oil filter
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post #48 of 60 (permalink) Old 05-11-2018, 11:35 PM
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So, just to sum up for clarity, regardless of using either the Haynes or the Triumph Service manual, the poonsing should occur before pre-filling the filter?
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post #49 of 60 (permalink) Old 05-12-2018, 05:25 AM
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Originally Posted by LapinAgile View Post
the poonsing should occur before pre-filling the filter?
yep

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post #50 of 60 (permalink) Old 05-12-2018, 05:36 AM
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...even a downside up filter can be pre-soaked


.
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Whenever I see a bike advertised with 'a shed load of extras' I often wonder how well it handled with a deckchair, lawnmower, some hose and a rake strapped to it.
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