Steverino's CB77

Steverino · Post by **Steverino** » Thu Feb 11, 2016 1:33 am

I've been slowly making some progress on the CB77. If I didn't have this leak, I would done. It's running down the upper engine case on the front left inner webbing. Here is a picture, if you look carefully you can see the drop, just ready to drop.

KIMG0415 by [

KIMG0418 (1) by Steve Steverinomeister, on Flickr=https://www.flickr.com/photos/127517865@N06/]Steve Steverinomeister[/url], on Flickr
The oil seems to be leaking directly above that where the flange on the upper case mates with the bottom of the barrel. I know a lot of oil is pumping up and drain back down through that area but I don't remember there being an O ring there. Just O rings on the outer bolts.

engine cases diagram (2) by Steve Steverinomeister, on Flickr
Is there something I missed here? I've done several of the smaller twins and haven't had this problem before. I was careful to clean and check the mating surfaces and to torque the head bolts. The only thing I can think of is I missed an O ring.
S

Hoosier Tom · Post by **Hoosier Tom** » Thu Feb 11, 2016 2:56 pm

Steve,

There is no o-ring between the barrels and top case, only the base gasket.

HT

G-Man · Post by **G-Man** » Fri Feb 12, 2016 1:50 am

Steve

Are eithe of the two knock pins sitting too proud of the case? Maybe they are a bit too long and holding the joint apart?

G

Steverino · Post by **Steverino** » Fri Feb 12, 2016 2:10 am

Thanks HT
That could be G-Man. Thinking about those knock pins, When I assembled the engine, I figured the correct torque of the head bolts would draw them up.
I started preparing to drop the motor this afternoon and I will have a better look this weekend. I will check for gapage between the barrel and engine case in that area before I pull the top end.
Steve
Below the picture of the motor is an organizer I bought at harbor freight. I hope to do away with all the cardboard boxes I spend so much time sifting through looking for parts.

KIMG0424 by Steve Steverinomeister, on Flickr
I like how I can see all the parts without having to dig around.

KIMG0423 by Steve Steverinomeister, on Flickr

G-Man · Post by **G-Man** » Fri Feb 12, 2016 2:45 am

Steve

When you have the top end off, put the barrel back on without base gasket you can then pull everything down and see if there is a gap.

Love the organizer. Spent more than a week searching fro the one kickstart gear that I knew I had. It turned up after I'd found a replacement......:-)

G

Steverino wrote:Thanks HT
That could be G-Man. Thinking about those knock pins, When I assembled the engine, I figured the correct torque of the head bolts would draw them up.
I started preparing to drop the motor this afternoon and I will have a better look this weekend. I will check for gapage between the barrel and engine case in that area before I pull the top end.
Steve
Below the picture of the motor is an organizer I bought at harbor freight. I hope to do away with all the cardboard boxes I spend so much time sifting through looking for parts.
KIMG0424 by Steve Steverinomeister, on Flickr
I like how I can see all the parts without having to dig around.
KIMG0423 by Steve Steverinomeister, on Flickr

Steverino · Post by **Steverino** » Fri Feb 12, 2016 9:51 pm

I'm Ready to remove the top end and find out why it's leaking.

KIMG0431 by Steve Steverinomeister, on Flickr

Steverino · Post by **Steverino** » Sat Feb 13, 2016 12:31 am

I wish I would have noticed this when I installed it. I have the wrong gasket. I'm glad I was putting plenty of oil to the top end on the first fire up. Is there an early and a late gasket?
Steve

KIMG0436 by Steve Steverinomeister, on Flickr

KIMG0433 by Steve Steverinomeister, on Flickr

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