davelegg@att.net
New member
I know this has probably been covered here many times but I am new here so Please bear with me.
I have a 1978 R100/7 that I am in the process of resealing the cylinders and replacing the pushrod tubes.
I am replacing the pushrod tubes because they leak badly from both the seals and the joint where they join the cylinder, The sealing flanges on at least two tubes are loose to the point where I can move them with my fingers.
My motor has NO groove on the cylinder for the big O ring and when I took it apart I noticed NO base gasket. Is this normal or am I missing something?
I have been trying to research just how far to install the new pushrod tubes into the cylinder but I am finding differing opinions. The answers I am finding range from flush with the base of the cylinder to 5mm from the base of the cylinder?
Also Do I need a base gasket or just some good cement/sealer at the cylinder base.
Permatex has a product called Right stuff that I have used before to seal aluminium transmission cases and it works great. Has anyone tried this at the cylinder base?
I understand that bmw airheads are prone to leak oil at the pushrod tubes and cylinder bases so this fix has been done a lot. I am hoping to tap into the wealth of knowledge that exists on this forum.
Thank you one and all for any replies I might receive.
David Legg
I have a 1978 R100/7 that I am in the process of resealing the cylinders and replacing the pushrod tubes.
I am replacing the pushrod tubes because they leak badly from both the seals and the joint where they join the cylinder, The sealing flanges on at least two tubes are loose to the point where I can move them with my fingers.
My motor has NO groove on the cylinder for the big O ring and when I took it apart I noticed NO base gasket. Is this normal or am I missing something?
I have been trying to research just how far to install the new pushrod tubes into the cylinder but I am finding differing opinions. The answers I am finding range from flush with the base of the cylinder to 5mm from the base of the cylinder?
Also Do I need a base gasket or just some good cement/sealer at the cylinder base.
Permatex has a product called Right stuff that I have used before to seal aluminium transmission cases and it works great. Has anyone tried this at the cylinder base?
I understand that bmw airheads are prone to leak oil at the pushrod tubes and cylinder bases so this fix has been done a lot. I am hoping to tap into the wealth of knowledge that exists on this forum.
Thank you one and all for any replies I might receive.
David Legg