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Author Topic: 1973 750 oil drip  (Read 1393 times)

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Offline Handlebar

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1973 750 oil drip
« on: May 06, 2018, 06:34:36 PM »
I have been working on my 73. I have noticed a oil drip on the left side , it is not the shift seal, and i suspect it is the oil seal behind the sprocket . Question is can this be replaced as it sets.
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Offline dave500

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Re: 1973 750 oil drip
« Reply #1 on: May 06, 2018, 07:08:16 PM »
has it got an auto chain lube?
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Offline ekpent

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Re: 1973 750 oil drip
« Reply #2 on: May 07, 2018, 05:28:23 AM »
 Check around the neutral switch under the engine on that side also. I had one that was a pretty good leaker. It was not even the gasket but was coming through the body of the switch.Easy fix.
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Offline 70CB750

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Re: 1973 750 oil drip
« Reply #3 on: May 07, 2018, 05:59:25 AM »
Quote from: Handlebar on May 06, 2018, 06:34:36 PM
I have been working on my 73. I have noticed a oil drip on the left side , it is not the shift seal, and i suspect it is the oil seal behind the sprocket . Question is can this be replaced as it sets.

Yes, the seal behind the sprocket can be replaced.  To get the old one out, drive two screws in it and pull it.  The new one goes back in with a - very - light use of silicon to make sure it stays.

But, as other say, first check where is it really coming from.
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Prokop
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I love it when parts come together.

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Offline evanphi

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Re: 1973 750 oil drip
« Reply #4 on: May 07, 2018, 08:22:14 AM »
Quote from: ekpent on May 07, 2018, 05:28:23 AM
Check around the neutral switch under the engine on that side also. I had one that was a pretty good leaker. It was not even the gasket but was coming through the body of the switch.Easy fix.

What is the fix? I think I might have this going on...
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--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline 70CB750

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Re: 1973 750 oil drip
« Reply #5 on: May 07, 2018, 08:37:16 AM »
Quote from: evanphi on May 07, 2018, 08:22:14 AM
Quote from: ekpent on May 07, 2018, 05:28:23 AM
Check around the neutral switch under the engine on that side also. I had one that was a pretty good leaker. It was not even the gasket but was coming through the body of the switch.Easy fix.

What is the fix? I think I might have this going on...

Replace the switch  ;)
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Prokop
_______________
Pure Gas - find ethanol free gas station near you

I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


CB900C

2006 KLR650

Offline evanphi

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Re: 1973 750 oil drip
« Reply #6 on: May 07, 2018, 08:37:51 AM »
Quote from: 70CB750 on May 07, 2018, 08:37:16 AM
Quote from: evanphi on May 07, 2018, 08:22:14 AM
Quote from: ekpent on May 07, 2018, 05:28:23 AM
Check around the neutral switch under the engine on that side also. I had one that was a pretty good leaker. It was not even the gasket but was coming through the body of the switch.Easy fix.

What is the fix? I think I might have this going on...

Replace the switch  ;)

Figured it was that easy. :P
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--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline adamalk3

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Re: 1973 750 oil drip
« Reply #7 on: May 07, 2018, 09:50:03 AM »
+1 on the chain luber.
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Online seanbarney41

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Re: 1973 750 oil drip
« Reply #8 on: May 07, 2018, 01:01:24 PM »
also do a really good clean under the sprocket cover...very common for the case to be cracked in there
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If it works good, it looks good...

Offline Handlebar

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Re: 1973 750 oil drip
« Reply #9 on: May 07, 2018, 05:51:59 PM »
Thanks for the input. It is not equipped with the "auto lube" system,must of been a option. I am waiting on rear shoes,then the "ass end" comes apart. I will look things over then. Hopefully it is not a cracked case as SeanBarney experienced .
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Offline ekpent

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Re: 1973 750 oil drip
« Reply #10 on: May 08, 2018, 04:18:48 AM »
 All the K3's came with an oiler from the factory. Maybe someone changed it out with a plug ? They stopped in either 75 or 76, can't remember right now. Here is a picture of one-  https://www.ebay.com/itm/74-HONDA-CB750-SOHC-CB-750-HM369B-ENGINE-SPROCKET-CHAIN-OILER-GREASER/351681063053?hash=item51e1d3288d:g:KS8AAOSwYlJW3zk8&vxp=mtr
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Offline Handlebar

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Re: 1973 750 oil drip
« Reply #11 on: May 23, 2018, 06:05:40 PM »
Well i found the culpit, Small dime sized chain slap on the case, Pieces still intact 3 coats of JB weld and wala no more oil drip. Installed the 4into2 Jardine turn-out slash cut exhaust, This think is coming together ,it may see some road time real soon.
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