OIL SCREEN HELP

[RodneyCB750K1979]

I need help with installing the oil pickup screen.  I bought a new rubber grommet, inserted it into the oil pump inlet, and then pushed the oil screen in. It feels loose to the point I don't think it will stay in.  What am I doing wrong? Should it be loose?

[seestheday]

Where did you get the grommet from? I recall mine being pretty snug. If you got it from the Honda dealer though, then it should be right.

[RodneyCB750K1979]

I got the rubber from my local Honda dealer.  I'm tending to think maybe the filter screen is suppose to be held in place by the oil pan. A snug seal fit is needed to prevent the pump from picking up any air leakage.

[Lucky 1]

Just because you got it from a Honda dealer does NOT mean it is the right part.

[Lucky 1]

No that oil ring has a purpose. If it was just loose in the hole then why even have one.
That is just wishful dangerous thinking.

Order another O ring from Bike Bandit.

Try taking the O ring off of the screen assy., and put it into the hole to see how it fits.
I bet it does not fit at all.

[RodneyCB750K1979]

I actually tried both ways. I first installed the rubber on the screen and then tried shoving it into the housing. It took some effort but it went in but the strainer could come out easily. Then I installed the rubber by itself into the housing and it had a firm fit. Then I inserted the screen. It went in easy and could be pulled out easy. Just want to make sure there isn't some sort of clip or tightning screw I'm missing here.  I may have to buy a new seal from another source.  I think the Honda salesman said this seal fits several different models and years. It was also non-packaged and may have been sitting on their shelf for a while.

[shinyribs]

Do you still have your old seal t compare to? I'm not familiar with the DOHC's,but I know on the matics that the pickup is retained by the oil pan,like you mentioned earlier.

[RodneyCB750K1979]

I still have the old seal.  The strainer fit is the same with either seal.  I measured the height of the strainer above the engine flange of 2.5 inches.  I measured the internal depth of the oil pan of 2.75 inches.  I then questioned if the strainer slips down so it is against the pan bottom, oil flow may be restricted not to mention pulling sediments up into the pump. I examined the oil pan bottom and there are three tabs in the pan bottom that prevents the screen from resting directly on the pan bottom. These tabs extend up about 3/8 inch and contacts the screen's outer rim.  In fact, if I look closely at the screen rim, I can identify three shiny spots which indicates to me the screen and pan do contact.  Now, is the pan designed to help hold the screen in place or were these tabs put there in case the screen came loose?  


 

[shinyribs]

My vote would be that it was designed to hold it in place. From the measurements you give it sounds spot on. There's no way ( I don't think) any manufacturer would trust the health of their engine to a rubber ring like that to be the only thing holding the oil pickup in place. It'd just be too risky of a thing to chance holding up years down the road.Yep,I definitely vote that the pan retains it,but that's just my two cents.

[seestheday]

How loose is it? Mine was snug enough to not want to fall out during assembly, but I wouldn't trust it to high pressure oil.

Sent from my BlackBerry device

From: shinyribs [via Honda CB750'S]

Sent: Friday, February 8, 2013 11:47 PM

To: seestheday

Subject: Re: OIL SCREEN HELP

My vote would be that it was designed to hold it in place. From the measurements you give it sounds spot on. There's no way ( I don't think) any manufacturer would trust the health of their engine to a rubber ring like that to be the only thing holding the oil pickup in place. It'd just be too risky of a thing to chance holding up years down the road.Yep,I definitely vote that the pan retains it,but that's just my two cents.

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[robs750]

To test the clearance of the screen assy. to the pan,place some clay on the pan tabs and then bolt the pan on with gasket.
Remove the pan and see how much the clay squished.
This will tell you if the pan holds the screen up which seems like it should.

[RodneyCB750K1979]

I'm fairly confident now the screen should be partly held in position with the oil pan and the rubber gasket is correct. However, because the consequences of being wrong are so great, I'm ordering a new $6 gasket from Bike Bandit just to be sure. Once I receive the gasket, I'll report how it fits.

[RodneyCB750K1979]

I received a new oil strainer gasket from BikeBandit today.  The screen fit much more snug in the seal.  It takes more pull force and twisting to remove the screen with this new seal.