250r leaking coolant

[200x newby]

im good with motors actually real good but just cant seem to figure out why my 86 250r is leaking coolant out the front 3 studs on the TOP of my cool head new gasket all the way through any ideers. i tried tightning them more and backing them off and retorqueing but cant seem to get it to stop but the gaskt in the right way. let me know thanks.

[hondaracer11]

are you using a torque wrench?

[madmanwithmouse]

might try some selant on both sides of the gasket.

[200x newby]

yes and ill rty but i wanna see if i can fix it without goop first.

[Dammit!]

I wouldn't use RTV on a head gasket. I've had good results with copper spray. Have you checked to see that both surfaces are perfectly flat?

[200x newby]

well the cylinder just had a 310 sleeve put in and cylinder looked to be surfaced and the head look straigh but that may be it its a cool head so i dont no if i should surface it or not.

[dizasterzrfun69]

i have the same problem on my 85 250r. It'll leak one day and not the next. It's mainly at the front of the head too like you stated :confused: . It has a pro design cool head with a brand new gasket and still leaks every now and then.

[RedRider_AK]

You sure your o-ring isn't nicked?

[200x newby]

its the non oring type cool head and the weird thing is its not leaking from between the cylinder and head but coming up through the studs then leaking out. no where else but coming up through the front 3 studs. i think you guys were thinking it was leaking between the cylinder and head. once again thatsa not where its leaking.

[Red Rider]

Are you running the copper washers underneath each acorn nut?

[200x newby]

i have the stainless 450-500 peice bolt kit for it it has regular stainless nuts with stainless warshers.

[max]

I just had my sleeve bored on my last build. When they did this, my sleeve somehow sunk a couple thou. Mine leaked when I first put it together. Pulled it about, and flattend the top of the cylinder and my problem was cured.

[200x newby]

i havnt even started it yet i put some coolant in the radiators and kicked it over very soft and slowly and it just started coming out i havnt even ran this thing yet.

[max]

Mine Did The Same Thing

[200x newby]

ic ic dang this is really starting to bug me i mean you would think it would leak between the head and cylinder but no its coming from the stud out the top this is very baffling:wondering

[max]

I miss read you. Please disregard my last two post. My leak was between the cylinder and the head.

I would try some thread sealant or rtv if I were in your shoes.

[Red Rider]

i have the stainless 450-500 peice bolt kit for it it has regular stainless nuts with stainless warshers.Stainless steel is a very hard metal & therefore won't squish much when you torque the head nuts down. Copper is a lot softer & will squish down. I know cool heads come with copper washers that are supposed to be used between the head & the nuts. Another possible problem is the fact that you're using a regular nut (with a hole all the way through it) rather than an acorn nut, which is solid on top. Most likely it is only leaking from the front studs because, with the way the engine is mounted, the front studs are lower than the back studs. If your engine were mounted completely level, it would probably be leaking from all of the studs.

Also, what type of head gasket are you using? The paper ATC type, or the metal shim CR type? If you're using the metal shim CR type, Pro-Design recommends you use a "thin fingerprint film sealant such as 3-bond #1211" to prevent water drips. I hope you get your cylinder drooling problem fixed. :drool:

[200x newby]

using the paper 250r style. i baught my cool head with 19cc dome used for $85 so all i got was the head and dome. i dont really want to use RTV or and other gasket sealer goop unless i actually have to i will go to the hardware store and see if i can get some copper warshers. thanks guys.

[Red Rider]

...i will go to the hardware store and see if i can get some copper warshers. thanks guys.Get some acorn nuts while you're at it. Most True Value & Ace hardware stores have a decent selection of metric nuts bolts in stock, quite often in stainless too!