Zylinderkof made from cast iron

Rocker arms.

The Rocker arms are guided by a steel support witch is cast en bloc with the zylinder head.
Later models came with a aluminium cylinder head. On the aluminium cylinder head, the support is screwed on the head.

 

Combustion chamber.

Around the outlet valve is a lot of residue of combustion. Maybe this is the reason for the low compression?

 

Outlet valve.

The outlet valve in detail.

 

The inlet valve.

The inlet valve in detail.

 

The outlet valve, view from exhaust.

In driving direction from left port.

 

The outlet valve, view from exhaust.

In driving direction from right port.
Here you cann see, that the rust remover is flown between valve and valve seat.

 

Combustion chamber without valves.

Combustion chamber after cleaning.
Before cleaning, i put some rust remover into the combustion chamber with closed valves. After a view hous, it was easy to clean the combustion chamber (with closed valves).
After cleaning it was possible to turn the outlet valve in the seat without any tools. Which means, that there was a gap between valve and valve seat.
Probably there was some debris of combustion on the shaft of the valve, which blocks the valve from sliding back onto the valve seat.
On the inlet valve was no turning possible without tools.

 

Seat of outlet valve.

This is the seat of the outlet valve after cleaning.
On the color of the seat you can see, that the valve has no contact to the seat due to the residue of combustion.

 

Seat of outlet valve.

This is the seat of the outlet valve after cleaning.
On the color of the seat you can see, that the valve has no contact to the seat due to the residue of combustion.

 

Valve guide of outlet valve.

The valve guide looks bad.
Between vlave and guide is also a lot of space.

 

Valve guide of outlet valve.

The valve guide looks bad.
Between vlave and guide is also a lot of space.

 

Cone of inlet valve.

On the edge of the cone, where the valve contacts the valve seat, is not enough material for a new seat grinding.

 

Parts of the outlet valve.

On the picture are all the parts, which belongs to the outlet valve.

 

Cone of outlet valve.

On the color of the cone you can see, that there was no cantact to the cone seat.

 

New valves.

The material of the valve guides is not suitable for a cast iron cylinderhead.
On a cast iron cylinderhead cast iron valve guides should be used.
Also it turned out, that the new inlet valve was 1mm greater in diameter, than the old one.
So i have bought new guides and trimmed the new valve to the original diameter.
I have bought the first parts by a known Horex dealer, trusted on his expert knowledge.
But: Trust is good, control is better!

 

New inlet valve.

New inlet valve in detail.

 

New outlet valve.

New outlet valve in detial.

 

Cylinderhead new valve guides.

The new iron valve guides were mounted by using liquid nitrogen to shrink them, before placing them into the head.
After this i have to bring them to size, by using a expanding reamer.

 

Cylinderhead valve cones.

The vlave cones were revised and the valves grinded in.

 

Cylinderhead prepaired for sand blasting.

I covered both sides of the head to protect them from sand blasting.

 

Cylinderhead painted.

Here the cylinderhead after sandblasting and painting.

 

Cylinderhead new valves.

The new valves are already mounted.

 

Zylinderkopf rocker arms.

2014 it got noises from the cylinderhead. To find out where the noises com from I removed the rocker arms
and found the worn out axes.

 

Zylinderhead worn out axes.

On this puicture you can see the damage.

 

 

 

 

Subcategories

We use cookies on our website. Some of them are essential for the operation of the site, while others help us to improve this site and the user experience (tracking cookies). You can decide for yourself whether you want to allow cookies or not. Please note that if you reject them, you may not be able to use all the functionalities of the site.