Coolant Cap O-Ring

[effinsiok]

Does anyone know what size and material the o-ring is that's used on the coolant cap? Mine is all cracked around the edges.

 

[Rashid510]

Does anyone know what size and material the o-ring is that's used on the coolant cap? Mine is all cracked around the edges.

Do you have an older Alta or a newer Alta?

The older bikes used a plastic coolant cap (M22)

The R bikes got the red anodized coolant cap which came with this O-ring: O-RING, 19.3MM ID, 2.2MM X-SECTION, NITRILE which the closest is this on McMaster: McMaster-Carr

 

[effinsiok]

Do you have an older Alta or a newer Alta?

The older bikes used a plastic coolant cap (M22)

The R bikes got the red anodized coolant cap which came with this O-ring: O-RING, 19.3MM ID, 2.2MM X-SECTION, NITRILE which the closest is this on McMaster: McMaster-Carr

I have an older MX (0035) with the plastic coolant cap.

 

[Rashid510]

So you need then the plastic coolant cap.

 

[effinsiok]

So you need then the plastic coolant cap.

Well the cap itself is fine, I just wanted to order a new o-ring from McMaster if someone knew the dimensions off hand. My calipers are in storage, but I'll figure it out.

 

[Rashid510]

Well the cap itself is fine, I just wanted to order a new o-ring from McMaster if someone knew the dimensions off hand. My calipers are in storage, but I'll figure it out.

There isnt a o-ring that came with that part. It was a single piece.

 

[effinsiok]

There isnt a o-ring that came with that part. It was a single piece.

Interesting, mine has an o-ring fitted under the head of the cap/plug, but there isn't a face or radial groove for it to sit in. It sort just gets squished between the head of the cap/plug and the aluminum frame. Should I take it off?

 

[Rashid510]

Interesting, mine has an o-ring fitted under the head of the cap/plug, but there isn't a face or radial groove for it to sit in. It sort just gets squished between the head of the cap/plug and the aluminum frame. Should I take it off?

MX35 is a pretty early bike, would you be able to take a picture of the coolant cap along with the coolant port near the deltawing?

Once I see that picture I can clearly discern between what was used.

 

[effinsiok]

MX35 is a pretty early bike, would you be able to take a picture of the coolant cap along with the coolant port near the deltawing?

Once I see that picture I can clearly discern between what was used.

Here are the pics, let me know if I misunderstood what you were asking for (I’m not sure how to rotate them from my phone)

 

[Rashid510]

@effinsiok those pictures look great!

Based on that...could have been changed accidentally. This is what I had on mine (which was straight from factory)

 

[Judaslefourbe]

Might be worth upgrading if you want to spend the time...

 

[effinsiok]

It looks like the data sheet says that cap normally comes with a flat fiber gasket, but a flat rubber gasket (NBR material) or o-ring can be requested. Maybe the spec changed during production? The dimensions for the flat rubber gasket were listed, so it should be easy to find a replacement.



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