Author Topic: Oil Pressure Sensor Rubber  (Read 1833 times)

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Offline conseann3ry

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Oil Pressure Sensor Rubber
« on: August 21, 2011, 10:51:37 PM »
So what are you guys doing to replace the rubber thing that covers the oil pressure sensor and seals the engine where the starter cover is.  #13 In the attachment.  The one on my bike doesn't fit.  It's about an 1/8 too short from connecting on the top.  I used RTV to jerry-rig the thing and although it worked for a decent amount of time it's now opened up again and I'm losing a good amount of oil through there and onto my shoes.  I have two questions about this:

1) Did they change the size of those throughout the years at all and mine just has the wrong size?
2) Is there any way to get this new still or does someone have a better way to make your own?

Anyways, you guys have always been great with helping me out before so thanks in advance for any replies.
1974 Honda CB750 812 Kit, Dyna Ignition, kind of cafe kind of rat

bollingball

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Re: Oil Pressure Sensor Rubber
« Reply #1 on: August 21, 2011, 11:09:06 PM »
Mabe large shrink tubing and dielectric grease

Offline bryanj

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Re: Oil Pressure Sensor Rubber
« Reply #2 on: August 21, 2011, 11:31:35 PM »
There should not be oil comming out of there, or do you mean the grommet that all the wires go through in which case i think Yamiya make an expensive repro
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline cookindaddy

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Re: Oil Pressure Sensor Rubber
« Reply #3 on: August 22, 2011, 03:09:32 AM »
I agree with the comments you are getting. The rubber cap is just a dust cover for the wire connection at the top of the sensor. If there is oil coming out of the top of the sensor, you have a bad sensor.

The rubber cap gets hard with age and heat. If you search here on "wintergreen" you will read about a treatment to soften old rubber safely.

But probably you will be shopping for a new or good used oil pressure switch and maybe a new rubber cap?
George with a black 78 CB750K (in Lion's Head, Ontario, Canada)

bollingball

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Re: Oil Pressure Sensor Rubber
« Reply #4 on: August 22, 2011, 05:19:06 AM »
Con I reread your post part#13 has nothing to do with keeping oil in like cook said it is only a dust moisture cap. I could not find #13 available so you may have to make something up. An oil leak from the top of the sensor means replacement.Also like roto said make sure it is not around the threads that is a easy fix.Bryan is correct too.

Offline Duke McDukiedook

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Re: Oil Pressure Sensor Rubber
« Reply #5 on: August 22, 2011, 01:16:05 PM »
Yamiya sells the grommet and cord for about $50US without shipping.
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Offline cookindaddy

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Re: Oil Pressure Sensor Rubber
« Reply #6 on: August 22, 2011, 01:25:52 PM »
I sold a nice used one on Ebay for about $5 a couple months ago. Worth maybe having a look?
George with a black 78 CB750K (in Lion's Head, Ontario, Canada)

Offline conseann3ry

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Re: Oil Pressure Sensor Rubber
« Reply #7 on: August 24, 2011, 12:10:22 AM »
I'm not talking about the part where the oil pressure switch screws on, but where the wires go through the middle and it seals near where the starter motor is.

50 bucks seems steep for that, I'm just going to look for a good used one and wintergreen it.  Seems like the most reasonable route.  Thanks for the help guys.
1974 Honda CB750 812 Kit, Dyna Ignition, kind of cafe kind of rat