do i need to put anything between the case halves?

[jetpilot36]

I should have searched, but I didn't. getting a new crank this weekend. and going back together with the cases. ive done pretty much all sorts or engine rebuilding except put cases together. this is my first time doing this. what should I put in between the case halves when re assembling the crank case? any kind of sealer or locktite?

 

[speedysprocket]

Most will use 1211

 

[Freakrider]

Clean cases with razor blade, wipe down with lacquer thinner and use Hondabond between cases. Don't forget to use some grease where seals ride on crank.

 

[Sparkplug]

Yamabond is what it came with I'm pretty sure

 

[Freakrider]

Some builders use loctite to secure bearings from chatter on the cases. Despite locating pins they still chatter and slowly wear the cases.

 

[smoofers]

Threebond 1211, Hondabond, Yamabond. All are silicone based sealants. You should be able to get any of them off amazon or at your local powersports dealer. Make sure your case mating edges are CLEAN and then apply a bead no larger than 1/8" in diameter to one of the case halves and smooth it to a THIN film. Assemble your cases and wait 24 hours before you pressure test. Some people put it on their crank seals where they fit in the cases, others put the seals in dry. I prefer dry seals and if the edge of one leaks then I'll go back and redo the cases and the seals.

 

[Freakrider]

Our local Yamaha dealer advised us that the Yamabond formula was changed (EPA) and that it's not as good now. Local builder advised Hondabond and it's worked great the past couple years for us local guys. 1211 is great stuff but cost more and Hondabond $7 works.

 

[Dartman]

permatex ultra black silicone works too

 

[BruceSki]

I put magic beans between them that crush and form a paste when I properly torque case bolts.




Just kidding. 1211 here. I buy two tubes every winter and use it up all year. Works great for stator cover gaskets and stator wire grommets as well.

 

[jetpilot36]

thanks for the responses. 1211 it is.

 

[Wizards Powersports]

We use HondaBond and lightly grease seals inside and out. Many dozens of motors with no issues!

 

[jetpilot36]

I guess I can start a new thread, but I don't want to seem incompetent. What's the best way to remove the coupler? Do I need to add heat?

 

[OCD Solutions]

I just separated a set of case halves from a gp1200r and found they used a red product that has remained almost jelly like. It still smears with a finger but it forms a thick glob that won't come off and get stuck in the crank or piston skirt like other gasket makers can.

I normally use 1211 but I'm liking how this red stuff sets up as it poses much less risk of bits coming free inside the cases if you happen to put on too much.

Is this one of the already mentioned products or have the cases been spot since the factory build it and I'm looking at whatever some backyard mechanic used to put it back together? It certainly looked like a factory sealed engine to me but I could be wrong.

 

[john zigler]

1211 in stock here;

https://www.watcon.com/shop-supplies/liquid-gasket

DO NOT put any on the seals.

We also have coupler removal tools;

https://www.watcon.com/tools/engine-1/yamaha-drive-coupler-removal-tool

Heat is your friend when removing the coupler.

 

[john zigler]

I just separated a set of case halves from a gp1200r and found they used a red product that has remained almost jelly like. It still smears with a finger but it forms a thick glob that won't come off and get stuck in the crank or piston skirt like other gasket makers can.

I normally use 1211 but I'm liking how this red stuff sets up as it poses much less risk of bits coming free inside the cases if you happen to put on too much.

Is this one of the already mentioned products or have the cases been spot since the factory build it and I'm looking at whatever some backyard mechanic used to put it back together? It certainly looked like a factory sealed engine to me but I could be wrong.

That looks like Loctite 518 to me. Sea-Doo used it back in the early days. IMO not good for case sealing.

 

[jetpilot36]

Loctite doesn't stay pliable. It hardens like a hard candy

 

[Freakrider]

Coupler tool and a good air impact...Bam off !
Don't forget anti-seize when putting it back on.

 

[jetpilot36]

Is the coupler reverse thread? Or regular righty tighty?

 

[OCD Solutions]

That looks like Loctite 518 to me. Sea-Doo used it back in the early days. IMO not good for case sealing.

I'm not familiar with 518 but I have a tube of 515 here that is red and specifically says it "flexes with minor flange movements".

 

[BruceSki]

Regular thread. Heat it a bit and use a coupler tool, or pry bar. Pops right off. Make sure to use a flywheel lock or a rope down one cylinder to stop the crank from spinning though.

Or in your case if the crank is removed from the cases already and is wrecked just clamp it in a vise. It's junk anyway.