Cool Head Bent?

[MarineNYC]

I got a mod quad coolhead off a guy on planet sand and I bought some 21cc domes for it. When I inserted the domes (and yes they are lined up). There seems to be a gap on the top where the dome meets the head. Almost like instead of completing the circle around the dome it peaks up a little. I looked at the other side and it looks exactly the same. Just checking if this is normal b4 I install it.

 

[brian]

How much is a little ?

When both plates and domes are assembled (without o-rings) the dome may

stick out of the base plate .003-.005 but more than that could end up being a

problem. I have seen that on every coolhead assembly I have dealt with. I think

they are designed that way to ensure that the domes are lightly pressed against

the cylinder deck.

You can hold all of the pieces together (domes up) on a bench and measure

the step with a depth mic.

 

Dont forget:

Because that aluminum expands and contracts with temp changes you will have

to retourque the head nuts after riding it once or twice.

[IrideA250R]

it looks to me that the material between the water jacket and where the dome goes is pushed into the water channel a little bit.

[brian]

oh,

i can hardly tell shit from that pic...

you are talking about the bore being out of round ?

[MarineNYC]

Yes the actual circumference of the opening

[brian]

does the dome fit in there loose or tight ?

[MarineNYC]

tight i have to knock it out from the outside when removing it

[brian]

They are supposed to be a close slip fit.

That is.... should slide out by hand with sme drag.

My guess is the guy you bought it from melted his motor down and warped

the head and had to beat the old domes out with a hammer.

 

You helped him buy a new head for his new build !!

 

You might be able to run it, a gap in that spot in most cases probably wouldnt

hurt anything, but it might be warped as you suspected.

Run it at your own risk.........you may have trouble getting it to seal everywhere.

 

I have gotten fucked on every purchase I have ever made over there at PS for

many $$$. It seems like those guys are all just looking for some sucker to buy

them new parts. I only do business here on the HQ now, and am still really careful

with who.

[C&B]

I got a mod quad coolhead off a guy on planet sand and I bought some 21cc domes for it. When I inserted the domes (and yes they are lined up). There seems to be a gap on the top where the dome meets the head. Almost like instead of completing the circle around the dome it peaks up a little. I looked at the other side and it looks exactly the same. Just checking if this is normal b4 I install it.

 

If it leaks, let me know, I have a Trinity head Ill sell cheap. Later

[MarineNYC]

It also looks like there is gray sealant coming through the stud holes. Should there be sealant there?

[MarineNYC]

???

[IrideA250R]

it might be anti-seize?

[racer]

so long at the o-ring grooves are intact and were they should be I doubt you will have any issues. However, I would lap the shit out of it to make sure it is as flat as can be. to take it a step further, pull the cylinders and lap those surfaces as well, then measure the distance between the top and bottom sealing surfaces of the cylinders. at that point everything should be height matched, and as flat as can be. sealing should not be an issue.

[dajogejr]

You're not running big bore domes. Hard to say by that pictures, but I think you'll be fine.