Honda-SOHC

SOHC.co.uk Forums => CB350/400 => Topic started by: Chris whit on September 09, 2019, 10:36:44 PM

Title: 400/4 sump gasket
Post by: Chris whit on September 09, 2019, 10:36:44 PM

Hi guys , noticed I’ve got a very slight oil leak from the sump gasket, is it possible to drop the sump without removing the engine .

Title: Re: 400/4 sump gasket
Post by: Bryanj on September 10, 2019, 12:55:35 AM

Yup

Title: Re: 400/4 sump gasket
Post by: Nurse Julie on September 10, 2019, 07:12:30 AM

Make sure it is the sump gasket that's leaking, a few years back I changed mine 3 times and still had a leak but eventually found it was either the oil pump, starter motor or gear change lever seal that was leaking (can't remember which now 🙄🙄). The oil was running down and along the line of the sump gasket making it look like it was that what was leaking.

Title: Re: 400/4 sump gasket
Post by: Nurse Julie on September 10, 2019, 04:04:40 PM

Quote from: Oddjob on September 10, 2019, 12:19:56 PM

Gear change seal sounds favourite to me.

Gold star 🌟 for Ken...yes, you are correct, it was the gear change seal on mine but the other 2 got changed in the process of diagnostics 🙄🙄🙄

Title: Re: 400/4 sump gasket
Post by: Chris whit on September 13, 2019, 08:09:54 AM

Thanks guys ,I’ll change the gear change seal as well .

Title: Re: 400/4 sump gasket
Post by: mike the bike on September 22, 2019, 05:52:57 PM

If you pressurise the crankcase, using compressed air on the breather pipe,  a leaking gear change seal will show up.