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Author Topic: Cleaning Oil Pan  (Read 373 times)

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Offline dubepj

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Cleaning Oil Pan
« on: September 14, 2022, 08:07:12 AM »
Took off my oil pan on my 1978 CB 750.  Was fairly dirty and I don't think ever was done before.  Bike has about 48000 KMS (30000 miles). 
So my question is when I first start the bike will there be sufficient oil in the oil pan for the oil pump to get suction??  I filled oil tank to the full mark on the dipstick.  I'll watch oil light to make sure it doesn't stay on and shut bike off if it stays on more than a couple seconds.
Thanks for your comments.
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Offline scottly

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Re: Cleaning Oil Pan
« Reply #1 on: September 14, 2022, 08:57:00 AM »
The pressure side of the pump pulls oil from the tank, not the pan. The scavenge side of the pump pulls oil from the pan and returns it to the tank.
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Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline dubepj

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Re: Cleaning Oil Pan
« Reply #2 on: September 14, 2022, 09:03:04 AM »
Thanks Scottly.  Very good explanation.  I guess if oil tank is full no need to worry.  This is my first CB750.
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Offline scottly

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Re: Cleaning Oil Pan
« Reply #3 on: September 14, 2022, 09:09:48 AM »
The 750s are "dry sump" engines, while the other SOHCs are "wet sump", with all the oil in the pan.
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Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Online PeWe

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Re: Cleaning Oil Pan
« Reply #4 on: September 14, 2022, 01:03:20 PM »
When I drain the oil in oilpan, about one bottle is needed to refill, 1l or a quart.
My oil pump does not leak to pan.
CB750 K6.
I inspect and clean the strainer on oil pump now and then.
« Last Edit: September 14, 2022, 01:06:33 PM by PeWe »
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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
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