Bypass filter on 300D - PeachParts Mercedes-Benz Forum

Tasma · #1 06-21-2003, 03:48 PM

Here is a picture of my Harvard 1 micron filter mounted behind the bumper of my 300D. I will be running Scheaffers 7000 series oil for 10,000 miles with this filter and do an analysis.

Diesel 924 · #2 06-21-2003, 05:18 PM

I like it except for that worm-drive hose clamp. That's a no-no. Is that hose you are using rated for oil? If it's not, it will get weak. Where on the engine are you routing the oil from and to?

coachgeo · #3 06-21-2003, 05:30 PM

Diesel 924: why is worm-drive clamp a no no. What is a yes yes?

Tasma: Didnt know they made a 1 micorn oil filter.... very interesting.

Tasma · #4 06-21-2003, 06:33 PM

The hose came with the filter so I think it will be OK. The red hose is the low pressure return line. It goes to the valve cover.
I tapped into the other oil filter for the supply.

Tasma · #5 06-21-2003, 06:41 PM

Here is some info on how the filter works.

www.harvardcorp.com/process.htm

P.E.Haiges · #6 06-22-2003, 10:27 AM

Tasma,

Although the worm-drive hose clamp is the best of its type, They a never used on pressure lines. Usually a crimped on fitting is used. A worm-drive clamp is OK on the low pressure line.

If that clamp fails, you could loose your oil and ruin the engine.

P E H

Q45Denver · #7 06-22-2003, 02:43 PM

I think someone mentioned that the regular oil filter already has a bypass portion built into it.

Tasma · #8 06-22-2003, 03:20 PM

I think the OEM filter is rated at 4 microns. What I like about the external filter is that it works a bit better plus you can tell if it is working. As long as it gets hot you know it’s not plugged.

On my 240D I used a Spinner II filter. I went 35,000 without changing the main filter. When I took it apart there was nothing in it. The bypass takes everything out. My oil analysis looked excellent also.

This is what a plugged filter looks like. 25 years in a John Deere tractor.

coachgeo · #9 06-22-2003, 04:24 PM

Quote:

Originally posted by Tasma
I think the OEM filter is rated at 4 microns.

Can anyone verify this?

Diesel 924 · #10 06-22-2003, 05:18 PM

Quote:

Originally posted by Tasma
The hose came with the filter so I think it will be OK. The red hose is the low pressure return line. It goes to the valve cover.
I tapped into the other oil filter for the supply.

I don't know if you want to hear this but, with a bypass filter, you are supposed to get the oil from a point past the primary oil filter(like a main gallery plug). This way, the oil has been filtered once by the primary down to ~4 microns and the small amount of oil that is sent to the bypass can be filtered further without filtering out relatively large particles.

Mordecai · #11 06-22-2003, 08:41 PM

How is this any different from the Franzen filter? (I think that the name) It's the bypass filter that uses a roll of toilet paper. I've heard they keep the oil in a MBZ diesel perfectly clean for about 3000 miles and the filter element is sure cheap.

I'm not thinking about one of these filters to my car, but I am curious what's the deal with them.

M.

Tasma · #12 06-22-2003, 10:25 PM

Nothing keeps the oil so clean that it doesn’t look black. Some of the soot in the oil is much too small to filter out.
The Harvard is superior in that it will never develop “channels” for the oil to flow through. The toilet paper filters as far as I know have this problem.
I don’t know if filtering the oil better than the OEM filter really does reduce wear. It is just a peace of mind thing for me.
Being able to run the oil 10,000 miles and only show 1PPM chrome and 33 PPM iron is quite good for a old Mercedes. I never checked it without the filter.

The filter elements are around $30 , but my son has had one on his car for a few years and it is still flowing OK. The toilet paper filters are cheap but you need to replace them frequently. I think the Amsoil filter has about the same performance and cost of the Harvard.