Need help! Head fitting fell off!

sparky22

sparky22

New member
Joined
Feb 21, 2008
Messages
43
Age
47
Location
milwaukee
My 99 vmax 500 top end was rebuilt. Today I took it out for the first ride and the fitting that comes out of the top of the head that goes to the carb heater valve popped out.

I called two dealers and they told me that the part is just compression fitted into the head. There are no threads on this part. They told me to use green locktite to re install it.

Does this sound right? Does anyone know what I am talking about?

Any ideas if this locktite will hold. I had a trip planned for this weekend so this needs to hold up.

Thanks
 
I'd tap threads in it and install a threaded fitting. I installed a head on my 600 off a 500 that had the fitting your talking about I removed it and threaded the hole and plugged it. You will have to remove the head to do this tho.
 
Here is the part. Its #2 on the diagram.



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mtnmaxman600 said:
I'd tap threads in it and install a threaded fitting. I installed a head on my 600 off a 500 that had the fitting your talking about I removed it and threaded the hole and plugged it. You will have to remove the head to do this tho.
Click to expand...

Do you know what size fitting you used? I cant measure it because the sled is up north and I wont be going back up there till the weekend and i need to have this thing fixed quickly when I get up there.

Also, if I remove the head, will I have to replace the head gasket?
 
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I tapped it to the same size as the coolant block drain. Not sure on the size been a couple of years ago. 1/8 npt would be the most common but its a little big I think I would go to the parts store and pickup a couple of different sizes and take along like a 1/4-28 90degree nipple for 1/4" hoses and 1/8" npt 90 Dergree nipple and maybe what metric would fall in between the 2 standard ones with the correct taps and drill bits and a cordless drill. You maybe can get away without removing head if you have a shop vac and use that while drilling hole and tapping that or coat drill bit with grease to collect shavings and do the same when tapping hole. If you have to remove head you will probably need a new head gasket never reused one also a torque wrench and you will need to bleed the air out of the coolant. If you try to glue it in with green loctite you would have to let it dry overnight. Good Luck
 
Thanks for all the suggestions mtn man. i will have to weigh all my options and figure what will work best.

I cant believe yamaha would design a part like that without threads! Did they really think "glue" would hold that thing in there? I wish I would have noticed how that thing was installed before I put the head back on. I would have tapped it then.

I am thinking of using red locktight on the fitting before I install it then green on the outside after installed. Then wrap some bailing wire around the engine and the top of the valve to keep pressure on top to hold it in for the weekend. Then tap it in the off season.

This is the only weekend this sled will be used this season so just trying to rig it up for the weekend.
 
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Yes it's press in,usually it's never a problem but you do hear it from time to time.

clean and dry the two areas,apply red high temp Lock-tite,allow to set up/dry for 24hr minimum.

should hold
 
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