Author Topic: Oil Pump Screen  (Read 433 times)

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Offline M 750K6

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Oil Pump Screen
« on: July 26, 2024, 02:54:50 PM »
The manual says clean the screen every 6,000 miles. When I looked at it, with the engine out (to rebuild my top end), despite easy access, I wasn't able to get the screen out of its housing. It felt like I was close to breaking the outer rubber ring. It wasn't too bad, so I pulled any muck off (tweasers!), which looked more like dirt and soft fibre, non metallic, gave it a wipe over and left it alone.

Two questions:
- Does everyone clean the mesh filter every 6,000 miles?
- How robust is it, is there a trick to getting it out without destroying it?

Thanks,
Martin

Offline BenelliSEI

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Re: Oil Pump Screen
« Reply #1 on: July 26, 2024, 05:04:22 PM »
Martin…… Like you, I just clean it and leave it. Probably easier when the bikes were new, but after so many years and heat cycles, I’m sure they would shatter. Either have a new one on hand or leave it in place…..

Offline HondaMan

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Re: Oil Pump Screen
« Reply #2 on: July 26, 2024, 06:56:31 PM »
The rubber ring covers a steel ring of the screen. I use a tiny flat-blade screwdriver to slowly coax them out.

But - cleaning them every 6000 miles always sounds silly when I didn't see mine until it had 50k miles on it, and it was still clean?

Then again, that last sandcast I did required it be soaked for 4 days in solvent before I could GET it clean...
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

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Offline M 750K6

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Re: Oil Pump Screen
« Reply #3 on: July 26, 2024, 11:19:32 PM »
Thank you. While the oil is coming out clean, I'll just check it occasionally and clean in-situ.

Online PeWe

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Re: Oil Pump Screen
« Reply #4 on: July 26, 2024, 11:35:24 PM »
Remove dirt from outside only. I'm sure the strainer will be deformed and fall out if removed several times.
There are new to purchase if bad.

I have never seen particles inside it.
A good idea to clean it 1000 km after a complete engine restore. Particles as sealer etc can sit in the nets outside.

I have not found much dirt after 10.000 km after engine restore.

If engine has been sitting for a long time in a humid place rusting, rust flakes might fall off if starting the engine.

Small parts from clutch fiber plates can sit there too.

Very important to clean it on a bike sitting many years. The strainer can be blocked by  oil sludge blocking the pump, engine will get no oil when tank no longer will get oil.

Honda gasket sealing the pan will accept removal of pan several times without replacing the gasket.
Important to not use additional sealer.
« Last Edit: July 27, 2024, 01:47:18 AM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline newday777

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Re: Oil Pump Screen
« Reply #5 on: July 27, 2024, 01:41:34 AM »
The rubber ring covers a steel ring of the screen. I use a tiny flat-blade screwdriver to slowly coax them out.

Then again, that last sandcast I did required it be soaked for 4 days in solvent before I could GET it clean...

Was that the red dirt/clay coated sandcast restore thread?
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline Deltarider

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Re: Oil Pump Screen
« Reply #6 on: July 27, 2024, 02:31:53 AM »
The first time I inspected the oil filter screen the engine had already done over 75.000 kms. Screen was spotless. 55.000kms later I checked it again. Again spotless. A few specs. I didn't even bother to clean it.
Same with my yacht. After 27 years I inspected the oil screen of my marine diesel engine for the first time. Screen was spotless. I'd say, leave it alone.
« Last Edit: July 27, 2024, 02:36:43 AM by Deltarider »
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Offline HondaMan

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Re: Oil Pump Screen
« Reply #7 on: July 29, 2024, 08:50:30 PM »
The rubber ring covers a steel ring of the screen. I use a tiny flat-blade screwdriver to slowly coax them out.

Then again, that last sandcast I did required it be soaked for 4 days in solvent before I could GET it clean...

Was that the red dirt/clay coated sandcast restore thread?

Yeah, that was the one. I thought it was a goner, but after soaking (forgotten, actually) most of a week I picked it out and a bunch of the crud came off in one big pack. It was a red dust (common around Houston where it came from) mixed with oil and water, made a nice paste. :D
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com