gasket sealer

[trilliumliz]

I know this is a probably a no-brainer, so please bear with me.

When I took the valve cover off (and wrecked the gasket) - it didn't appear that there was any sealer on the gasket. The manual specifies 2 different sealer options.

Is sealer necessary and if so, does it matter which one?

Thanks.

 

[Bigbore4]

I have not been into mine yet. Is it a rubber or "rubber like" gasket? If so it should only need a small dab of RTV Silicone or similar anywhere there is a seam or other joint. If you seal it full length with anything, it will just be an awful mess at next service.

If it needed sealant it would have been there from the start.

I will be at first valve interval sometime this summer. Reading your post and some of the replies has been informational. Sounds like it will be about as much fun as my Gen I FJR.

 

[Mchaskell]

FWIW, I would follow the manual. The Three Bond 1541C is a water based pressure sensitive adhesive between the gasket and the cover. The Yamaha Bond looks to be a RTV silicone used between the gasket and the head. The Three Bond could be used just to make reassembly easier as it would hold the gasket in place to the cover. The Yamaha Bond is used in a small area around the head relief areas that allow for the cam bearing to be machined, this is a pretty common usage as I recall from similar engines.

I am sure more experienced voices will follow.

 

[BaldKnob]

I know this is a probably a no-brainer, so please bear with me.

When I took the valve cover off (and wrecked the gasket) - it didn't appear that there was any sealer on the gasket. The manual specifies 2 different sealer options.

Is sealer necessary and if so, does it matter which one?

Thanks.

Liz,

I used HondaBond but Yamaha makes a similar product. The sealer is being used to hold gasket in place while you manipulate the cover in position. The rubber does all the actual "sealing". Yamaha didn't use the 'Bond from the factory because the engine was assembled then installed.

Do not use RTV sealer.

Apply a small bead to the valve cover and then spread that bead out into a thin layer using your fingers. Wipe excess sealer being careful to remove all sealer from the inside edge. Any sealer left inside is usually caught in the filter but a large piece could clog an oil passage. The sealer should be getting "tacky" after a few minutes. Apply gasket to valve cover, pushing it into the groove surrounding the cover. Again, check for excess sealer now that gasket is in place and remove from the inside edge. Once in place, verify the rubber gasket isn't outside (or inside) the cover. Wipe any excess sealer from the outside of cover and you're good to go. Watch this area after running the bike for oil leaks. Good luck.

 

[Mchaskell]

BaldKnob,
Did you use Handabond 4 or Hondabond HT?

 

[BaldKnob]

BaldKnob,
Did you use Handabond 4 or Hondabond HT?

I don't have the tube in front of me but pretty sure it is the HT. Been using the same tube on the KTM cover for years and aside from the mess it does very well.

 

[Mchaskell]

Well I don't want any blood on my hands...but.

My Yamaha service manual shows Yamaha bond No. 1215 "4" or Three Bond No. 1215 applied to the gasket mating surfaces on the cylinder head cover gasket and cylinder head, page 5-23.

Per Three Bond (http://www.spmc.ru/assets/fs/files/Threebond-Technical-Catalog.pdf): Three Bond 1200 series are RTV silicones. Three Bond 1215 is listed as a De-Oxime type curing RTV silicone.

I would imagine that Three Bond is the OEM of Yamaha bond 1215.

 

[motoguy]

Liz,

I used HondaBond but Yamaha makes a similar product. The sealer is being used to hold gasket in place while you manipulate the cover in position. The rubber does all the actual "sealing". Yamaha didn't use the 'Bond from the factory because the engine was assembled then installed.

Do not use RTV sealer.

Apply a small bead to the valve cover and then spread that bead out into a thin layer using your fingers. Wipe excess sealer being careful to remove all sealer from the inside edge. Any sealer left inside is usually caught in the filter but a large piece could clog an oil passage. The sealer should be getting "tacky" after a few minutes. Apply gasket to valve cover, pushing it into the groove surrounding the cover. Again, check for excess sealer now that gasket is in place and remove from the inside edge. Once in place, verify the rubber gasket isn't outside (or inside) the cover. Wipe any excess sealer from the outside of cover and you're good to go. Watch this area after running the bike for oil leaks. Good luck.

DEAD ON !!!
::003::

 

[trilliumliz]

Liz,

I used HondaBond but Yamaha makes a similar product. The sealer is being used to hold gasket in place while you manipulate the cover in position. The rubber does all the actual "sealing". Yamaha didn't use the 'Bond from the factory because the engine was assembled then installed.

Do not use RTV sealer.

Apply a small bead to the valve cover and then spread that bead out into a thin layer using your fingers. Wipe excess sealer being careful to remove all sealer from the inside edge. Any sealer left inside is usually caught in the filter but a large piece could clog an oil passage. The sealer should be getting "tacky" after a few minutes. Apply gasket to valve cover, pushing it into the groove surrounding the cover. Again, check for excess sealer now that gasket is in place and remove from the inside edge. Once in place, verify the rubber gasket isn't outside (or inside) the cover. Wipe any excess sealer from the outside of cover and you're good to go. Watch this area after running the bike for oil leaks. Good luck.

Excellent advice. Thanks!

 

[trilliumliz]

I have not been into mine yet. Is it a rubber or "rubber like" gasket? If so it should only need a small dab of RTV Silicone or similar anywhere there is a seam or other joint. If you seal it full length with anything, it will just be an awful mess at next service.

If it needed sealant it would have been there from the start.

I will be at first valve interval sometime this summer. Reading your post and some of the replies has been informational. Sounds like it will be about as much fun as my Gen I FJR.

A barrel of fun!

 

[trilliumliz]

Thanks everyone for your tips! Much appreciated.

Now I've just got to get the gasket which should be arriving today at a US PO Box. A delight to look forward to going across the Niagara Falls border on a holiday weekend in both countries!

 

[tc9988]

Thanks everyone for your tips! Much appreciated.

Now I've just got to get the gasket which should be arriving today at a US PO Box. A delight to look forward to going across the Niagara Falls border on a holiday weekend in both countries!

just walk across