1964 CA77 Restoration

G-Man · Post by **G-Man** » Thu May 07, 2015 3:16 pm

Much of the leakage occurs around the periphery of the gears in the pump. I re-machine the casing and install thicker, larger diameter gears in matched pairs.

G

LOUD MOUSE · Post by **LOUD MOUSE** » Thu May 07, 2015 3:18 pm

I'll answer this in a way which will either bring different ideas or do as HONDA did.
All the actual GASKETS on the engine were installed dry.
The only sealant was the Honda Bond between the cases.
That's the way HONDA did it and how I've done since 1965. ...............lm

Seadog wrote:Thanks, LM. That's the best answer yet - don't remove them at all. I'll leave the one in the engine case alone.

When I cleaned up the pump housing and the filter, it appeared that the gaskets had been glued down with what I guess to be a shellac gasket compound. I think that's what was holding the pin in too. Once I cleaned the pin and the hole, the pin slides in and out freely. Was shellac gasket compound the right thing to use on the gaskets and on the pin?

Seadog · Post by **Seadog** » Thu May 07, 2015 3:44 pm

G-Man wrote:Much of the leakage occurs around the periphery of the gears in the pump. I re-machine the casing and install thicker, larger diameter gears in matched pairs.
G

You do amazing work, G. I could never do such things, but I sure enjoy seeing it done.

LOUD MOUSE · Post by **LOUD MOUSE** » Thu May 07, 2015 3:47 pm

Any work done with the location of the pins?. ..........lm

G-Man wrote:Much of the leakage occurs around the periphery of the gears in the pump. I re-machine the casing and install thicker, larger diameter gears in matched pairs.

G

Seadog · Post by **Seadog** » Thu May 07, 2015 3:50 pm

LOUD MOUSE wrote:I'll answer this in a way which will either bring different ideas or do as HONDA did.
All the actual GASKETS on the engine were installed dry.
The only sealant was the Honda Bond between the cases.
That's the way HONDA did it and how I've done since 1965. ...............lm

That's good enough for me, LM. I'm not going to reinvent the wheel here.

I opened the pump up. Unfortunately, I had to drill the head off of one screw. Inside looks ok to me, but I'm eager for expert opinions.

G-Man · Post by **G-Man** » Thu May 07, 2015 3:54 pm

Seadog

Thanks! I don't like to throw things away so I am happy to restore parts that others might regard as scrap. That is what interests me. We all have our skills and abilities. You can enjoy these bikes at all levels. I also like to learn from the tricks and tips that people share on this site and others.

I saw a great quote the other day - "When you talk you are just repeating things that you already know, but when you listen you may learn new ideas....."

G

Seadog wrote:
G-Man wrote:Much of the leakage occurs around the periphery of the gears in the pump. I re-machine the casing and install thicker, larger diameter gears in matched pairs.
G
You do amazing work, G. I could never do such things, but I sure enjoy seeing it done.

G-Man · Post by **G-Man** » Thu May 07, 2015 4:01 pm

Yes - the gears are nominally the same diametral pitch (14 DP) but are actually larger diameter and the shaft centres need spacing out. I made a sizing jig so that I could measure the correct running clearance. The non-driven gear is moved down and is larger diameter shaft. The hole for this shaft overlaps the original hole in the casing so there are no holes to fill up in teh case.

LOUD MOUSE wrote:Any work done with the location of the pins?. ..........lm

G-Man wrote:Much of the leakage occurs around the periphery of the gears in the pump. I re-machine the casing and install thicker, larger diameter gears in matched pairs.

G