Author Topic: 1973 CB500k oil pressure gauge install - pretty easy!  (Read 1381 times)

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Offline Acoustoman

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1973 CB500k oil pressure gauge install - pretty easy!
« on: August 02, 2015, 04:24:53 PM »
Hi folks, I've been reading some of the posts about the oil light flickering after the engine is hot, installing a pressure gauge, etc. I ended up replacing the pressure switch/sending unit with a $9 replacement from the auto parts store.  It fit perfectly and oil light problem was solved. But I also wanted to be able to measure pressure without bypassing the oil dummy light.
So, long story short, I purchased an inexpensive gauge from O'reilly's. I drilled and tapped a 1/8" NPT hole in the right side oil gallery plug, under the points cover. Then I used a brass close nipple and elbow, into which I screwed the compression fitting that came with the gauge. I ran the tubing inside of some nylon tubing for extra protection then up to the gauge (I'll probably replace this outer sleeve with stainless braided fuel line at some point). I had to make a mounting bracket for the gauge with a 2" hole in it. Anyway, the pictures tell the rest of the story and it works great. Pressure is running around 50-60 psi when bike is warmed up (a little higher when bike is cool). It's just another level of insurance to make me feel better that my oil pump is functioning properly. BTW, I'm running Rotel T6 5W40 in it right now, but wondering if I should thicken up to 20W50?
Maybe I'll upgrade the gauge to a better one at some point, but at least the hard work is done, and without too much trouble or expense (about 30 bones). ;)
« Last Edit: August 04, 2015, 04:08:33 PM by Acoustoman »
1973 CB750K (My rider)
1976 CB550K (Next project)
1973 CB500K (Sold)
1981 CB650C (Sold)

Offline Sami1987

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Re: 1973 CB500k oil pressure gauge install - pretty easy!
« Reply #1 on: August 03, 2015, 04:08:43 AM »
Very nice. I may do this to mine!

Offline 70CB750

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Re: 1973 CB500k oil pressure gauge install - pretty easy!
« Reply #2 on: August 03, 2015, 04:14:53 AM »
Job well done!
Prokop
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CB750K3F - The Red
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2006 KLR650

Offline KayOne

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Re: 1973 CB500k oil pressure gauge install - pretty easy!
« Reply #3 on: August 03, 2015, 12:54:48 PM »
Great job, OEM look and you can keep you eyes on the road vs bending over to look at a gauge installed on the upper oil gallery.
CB750 K1 restored
1979 CB750Fz - original except for exhaust, 14000km
1984 VF45F Interceptor - all original, 12000 km
1968 S90 - all original, 2100 miles
1973 H2a, Restored
1973 H1D, next project
CB750K1 (sold)
1976 KZ900 (sold)
1981 CB900F (under restoration)
2015 Yamaha FJ09, my appliance rider

Offline snowfighter2

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Re: 1973 CB500k oil pressure gauge install - pretty easy!
« Reply #4 on: August 03, 2015, 04:15:47 PM »
Nicely done! I might do something like this on my 650.
Andrew
That which does not kill you, will give you some awesome scabs, which turn into some cool scars!
1975 CB750K5
1985 GS 450E
1981 CB650 Custom

Offline Acoustoman

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Re: 1973 CB500k oil pressure gauge install - pretty easy!
« Reply #5 on: August 03, 2015, 10:32:21 PM »
Hey, I have an 81 cb650 custom also! Nice bike. Thanks
1973 CB750K (My rider)
1976 CB550K (Next project)
1973 CB500K (Sold)
1981 CB650C (Sold)