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Author Topic: Oil Filter  (Read 1282 times)

OldeGoat

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Re: Oil Filter
« Reply #15 on: September 08, 2016, 05:36:49 pm »
The plastic filter in mine seems a similar size to the inner one in the photo, but instead of having the hole in the top, mine has an enclosed cone, or point. As previously mentioned, the Mazak tube fits onto item 38 via a hole which houses an o ring.  The bottom of the tube is castellated having four slots in it, so the tube goes on first,  followed by the mesh tube, which can only be inserted with the pointed end down facing the drain plug, which appears to hold it all in position.  Having just changed the oil, I'm going to drop it again so that I can photograph the parts, then you can see what I'm on about.  Does any one know if the filter for a 250 Aermacchi will fit?
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banquo

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Re: Oil Filter
« Reply #16 on: September 08, 2016, 05:57:03 pm »
I guess there are two questions here; if you already had a plastic filter, I'm pretty sure the 250 and 350 Aermacchi filters are the same. However, as you have the metal filter, it's possible that the plastic one won't be a direct replacement, and you may need the tube as well?
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OldeGoat

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Re: Oil Filter
« Reply #17 on: September 08, 2016, 06:17:06 pm »
Bit of a puzzle, isn't it?  If I need the tube, I'll make one from aluminium and ditch the Mazak!.
will get the pics done tomorrow.
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banquo

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Re: Oil Filter
« Reply #18 on: September 09, 2016, 12:11:35 pm »
Here are the pix, posted on behalf of OldeGoat:





Anyone recognise these as a stock filter, or has someone bodged it by adding a metal outer to replace a lost or broken plastic outer?
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OldeGoat

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Re: Oil Filter
« Reply #19 on: September 09, 2016, 12:47:44 pm »
The Mazak outer tube has ejector pin marks inside on the boss which houses the O rings, consequently I believe it to be an item specifically manufactured for the bike. I think this is confirmed by the inner filter having the cone which locates on the sump plug.  If this is the original set up, then maybe I'm worrying unnecessarily, however, when you read the Mazak tube is prone to break up, it narrows the mind a bit! I've had a look at the KN157 filter elsewhere on the forum, and am tempted to go down that route.  There's a pair of plastic filters on eBay for the 250 Aermacchi so that's another option. Decisions, decisions!
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banquo

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Re: Oil Filter
« Reply #20 on: September 09, 2016, 01:13:36 pm »
It does look pretty robust, much more so than I'd expected, but given the reputation, it would have to go. When you say ejector pin marks, you mean it's been a pressure diecasting?
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OldeGoat

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Re: Oil Filter
« Reply #21 on: September 09, 2016, 02:07:40 pm »
Yes it's definitely been diecast, and it looks sound, but there's that lingering doubt. In the knowledge that the two part plastic filter has stood the test of time, I suppose it's the obvious way to go, but as has been said elsewhere, the filtration is a bit coarse.  It's a shame that the forum member who fitted the KN157 filter hasn't updated as to whether or not it has been successful regarding the oil pressure.  If the oil light goes out, I assume that means it's ok?
The dealer who supplied my bike has offered to get a filter for me, but they will have the same problem as me, unless they have another source for spares.  I'm waiting delivery from Italy, of a new outer filter, so, providing it's ok, I only need an inner one.  After looking at the Aermacchi site I can buy a pair of used filters for about £20 including shipping. Trouble is its in the US so if I order it, it means yet another long wait!
If I'm not careful, I'll have a stock of them!
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johnedwards

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Re: Oil Filter
« Reply #22 on: September 09, 2016, 05:16:16 pm »
yes. basically, fitting it stabilised the oil pressure from the oil light flashing occasionaly to a steady reading of 60 psi even at tickover
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OldeGoat

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Re: Oil Filter
« Reply #23 on: September 09, 2016, 05:31:51 pm »
So it's the way to go, then?
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OldeGoat

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Re: Oil Filter
« Reply #24 on: September 10, 2016, 07:51:22 am »
My last post was a rhetorical question - we all have to make our own decisions regarding what we do to our bikes, so thanks to everyone who has contributed to this thread.  It's all interesting stuff, and a big help to us new to the NF.

To recap, my filter set-up seems to be of an older type, prone to causing potentially serious problems.

The two part plastic type filter appears to be the most prevalent set up.

The KN157 looks to be an option which provides extremely good filtration, needs a slight modification on one end but has been proved to work.

A similar filter from Germany appears to be a bit shorter than all of the other options so not sure if it will be suitable, although it's advertised as an alternative.  I had a very quick response from the seller yesterday when I asked for dimensions, which was commendable.

Not yet decided which way to go yet.  I've complicated things for myself by ordering the outer from Italy, so who knows when that will arrive. I have the option of ordering the two part filter for a 250 Aermacchi from USA, again with a long delivery period.
Or I can get the KN157 and the one from Germany fairly quickly and get it sorted.
I'll keep you posted - I'm sure you're all on tenterhooks!!! ;D
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Kater

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Re: Oil Filter
« Reply #25 on: September 10, 2016, 06:20:12 pm »
Be carefully we the KN filter! The resistance it to high for mounting in the sucking line, especially when the oil is cold. This is very bad for  the camshaft and rods! I tried it and went back as I recognised this. I would use your original special setting, it looks quite good....

Cheers Kater
« Last Edit: September 10, 2016, 07:02:53 pm by Kater »
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OldeGoat

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Re: Oil Filter
« Reply #26 on: September 10, 2016, 06:45:47 pm »
I've been mulling this over all day.  First off, I think I'm being a bit too paranoid about my original set up; after all, it's been in the engine since 1971! It looks sound, with no sign of cracks or deterioration, so I'm inclined to put it back in til I get my preferred option, which is the two part plastic filter.  Thanks for your input Kater.  I hadn't considered the resistance resulting from the micro filter construction.
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krisztian_andre

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Re: Oil Filter
« Reply #27 on: October 30, 2016, 05:50:06 pm »
Not sure if this is on topic but someone here in germany is selling a modern filter from another bike that according to him fits the NF perfectly.
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banquo

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Re: Oil Filter
« Reply #28 on: November 03, 2016, 09:26:03 am »
Any details of what that filter is?
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OldeGoat

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Re: Oil Filter
« Reply #29 on: November 03, 2016, 05:05:01 pm »
The one in Germany that I enquired about is 48 mm long, 40mm diameter with an 11mm dia hole, and it looks as though it's a " paper" filter.  I seem to remember it's a fair bit shorter than mine, so I discounted it.
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