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Author Topic: CB400f Missing Oil Pump Dowel  (Read 488 times)

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Offline Calumjs

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CB400f Missing Oil Pump Dowel
« on: August 02, 2025, 01:27:00 AM »
Chasing leaks I found myself renewing all the seals in the oil pump, when removing the pump I noticed only one dowel shown in the picture, would this be an issue reassembling with the dowel missing? Or was this the cause of my leak?
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Offline bryanj

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Re: CB400f Missing Oil Pump Dowel
« Reply #1 on: August 02, 2025, 03:06:42 AM »
It could cause a leak in theory as the O ring is not stopped from going inwards, does the parts list show 2 dowells?
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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 Killer Canary

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Re: CB400f Missing Oil Pump Dowel
« Reply #2 on: August 04, 2025, 03:10:38 PM »
I just finished replacing my pump seals. There are two of those small dowels and two larger dowels; all holding o ring seals in place. This may be a dumb question: is the missing dowel perhaps still in the case half of the pump?
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If it's worth doing at all it's worth over-doing.
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Offline Calumjs

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Re: CB400f Missing Oil Pump Dowel
« Reply #3 on: August 12, 2025, 09:33:54 PM »
Was definitely missing when I removed it. I took one to my local machine shop and they made me a few!
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