Author Topic: Oil filter question for RGS  (Read 1218 times)

Offline lillygunny

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Oil filter question for RGS
« on: 21.06. 2019 19:39 »
I have a Rocket Gold Star with an oil filter installed by Frank Diehl. Frequently oil blows out the breather when the oil is cold evan if I drain the sump beforehand. I have pried out the rubber seal in the filter and though that helped it did not solve the problem. Is there a low back pressure bypass filter available or other solution to this problem? Once the engine is hot it works fine. I use Silkalene 20/50 oil.
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Online Triton Thrasher

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Re: Oil filter question for RGS
« Reply #1 on: 21.06. 2019 19:54 »
The problem is probably not caused by the filter.
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Offline lillygunny

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Re: Oil filter question for RGS
« Reply #2 on: 21.06. 2019 19:55 »
Then what is the cause? Thanks
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Online morris

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Re: Oil filter question for RGS
« Reply #3 on: 21.06. 2019 20:57 »
What type of filter have you got? I had a look on Frank Diehl’s website but there’s no mention of an oil filter?
I have a Champion COF 103101S screw on type mounted in the toolbox. Works fine.
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Offline lillygunny

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Re: Oil filter question for RGS
« Reply #4 on: 21.06. 2019 21:41 »
Hiflofiltro HF147 with rubber seal pried out.
Thanks
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Online morris

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Re: Oil filter question for RGS
« Reply #5 on: 21.06. 2019 22:52 »
You could try an equivalent from another manufacturer, see if that helps.
Seems though that the HF147 is a rather standard filter, comparable to the Champion, and I do not see how prising out the rubber seal may help get a better return. It would seem logic that the oil would leak out without the seal, so if it doesn’t that would mean there’s almost no return pressure.
Following that, I am leaning towards TT’s opinion that the filter may not be the culprit here but that there’s something wrong on the oil pump return side
When you have emptied the sump, does it take a while for the oil coming out of the breather pipe or is it coming out immediately?
I would start by disconnecting the filter feed line (engine return) and see if there’s a good return flow. Just don’t let the engine run to long in that condition because there won’t be any oil going to the rocker box. Or If it’s not possible to disconnect the feed line, at least check the return in the oil tank. There should be a decent amount of oil gushing out of the return pipe.
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Offline lillygunny

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Re: Oil filter question for RGS
« Reply #6 on: 21.06. 2019 23:12 »
Very good immediate oil return in the tank. Sorry, I should have mentioned that. It takes about 10 seconds before the oil shows up underneath and then slows dow, stops totally in a minute or two, Frank said it is cold thick oil causing a higher back pressure and a different filter might work, but he didn't have one to recommend. In a previous oil filter thread it was mentioned to pry out the rubber seal in the filter.I will just disconnect the filter and go back to nondetergent oil but I was hoping someone else on the forum had this problem and resolved it.
Thanks.
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Online RichardL

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Re: Oil filter question for RGS
« Reply #7 on: 22.06. 2019 02:00 »
What other work did Mr. Diehl do on your bike when he installed the oil filter?

Richard L.
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Offline lillygunny

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Re: Oil filter question for RGS
« Reply #8 on: 22.06. 2019 02:05 »
Richard, complete engine rebuild with roller bearing conversion. I had installed an SRM oil pump about 500 miles prior to the rebuild.
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Online Triton Thrasher

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Re: Oil filter question for RGS
« Reply #9 on: 22.06. 2019 07:54 »
Yes, bypass the filter completely and see if that has an effect.
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Offline duTch

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Re: Oil filter question for RGS
« Reply #10 on: 22.06. 2019 08:48 »

 liily- there may be some crucial information missing here....
ie; Have you used this motor before adding the filter..
     What type of filter head you are using...and exactly which seal did yo remove  *conf2*  ?

      Some pics may help to explain some things
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Re: Oil filter question for RGS
« Reply #11 on: 22.06. 2019 14:09 »
G'day lilly.
duTch asked my next question. If using one of the filter heads commonly found on fleabay (Notrun type) it should use an RF153/KN153. I have these on both mine and still using the 60 ya old pumps with no problems.
https://tinyurl.com/y3ryxvrw
Cheers
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Re: Oil filter question for RGS
« Reply #12 on: 22.06. 2019 15:49 »
musky I bought a champion cof103101s  off ebay for the very slow going new build , does anybody use these or know if they are ok to use they are for citroen  cars apparently
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Offline bikerbob

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Re: Oil filter question for RGS
« Reply #13 on: 22.06. 2019 16:34 »
According to the Champion website that filter cof103101s is for a BMW series 3 model, just checked on ebay and a dealer is selling on oil filter kit  with that filter, type this no. into ebay 372685007930 you can just read the number although it is upside down.
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Online morris

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Re: Oil filter question for RGS
« Reply #14 on: 22.06. 2019 19:53 »
musky I bought a champion cof103101s  off ebay for the very slow going new build , does anybody use these or know if they are ok to use they are for citroen  cars apparently
I have one on the SA. Small enough to hide in the toolbox, easy to install.
No visual difference in oil tank return flow.
The only thing I do is fill the filter up with oil before screwing it on so the rocker box will get oil immediately on first start up
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